CA1335072C - Method for determining the compositional distribution of a crystalline copolymer - Google Patents
Method for determining the compositional distribution of a crystalline copolymerInfo
- Publication number
- CA1335072C CA1335072C CA000589676A CA589676A CA1335072C CA 1335072 C CA1335072 C CA 1335072C CA 000589676 A CA000589676 A CA 000589676A CA 589676 A CA589676 A CA 589676A CA 1335072 C CA1335072 C CA 1335072C
- Authority
- CA
- Canada
- Prior art keywords
- column
- solvent
- copolymer
- temperature
- fractions
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 229920001577 copolymer Polymers 0.000 title claims abstract description 43
- 238000009826 distribution Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000002904 solvent Substances 0.000 claims abstract description 46
- 229920000642 polymer Polymers 0.000 claims abstract description 25
- 239000000203 mixture Substances 0.000 claims abstract description 20
- 239000000178 monomer Substances 0.000 claims description 6
- CYTYCFOTNPOANT-UHFFFAOYSA-N Perchloroethylene Chemical group ClC(Cl)=C(Cl)Cl CYTYCFOTNPOANT-UHFFFAOYSA-N 0.000 claims description 5
- 229950011008 tetrachloroethylene Drugs 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 4
- 238000005194 fractionation Methods 0.000 abstract description 11
- 238000004566 IR spectroscopy Methods 0.000 abstract description 2
- 238000010828 elution Methods 0.000 description 7
- 238000002360 preparation method Methods 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 238000002835 absorbance Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 238000011088 calibration curve Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229920000092 linear low density polyethylene Polymers 0.000 description 2
- 239000004707 linear low-density polyethylene Substances 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/004—Fractional crystallisation; Fractionating or rectifying columns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0063—Control or regulation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N2030/0075—Separation due to differential desorption
- G01N2030/008—Thermal desorption
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/14—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation
- G01N25/147—Investigating or analyzing materials by the use of thermal means by using distillation, extraction, sublimation, condensation, freezing, or crystallisation by cristallisation
Abstract
A method for fractionating crystalline copolymers to determine solubility distribution as a function of temperature.
Fractionation is conducted by passing a solvent through a column containing the crystallized copolymer at an increasing temperature from 6°C to about 120°C. The polymer solution exiting the column is analyzed by infrared spectroscopy or NMR to determine the composition distribution of the copolymer.
Fractionation is conducted by passing a solvent through a column containing the crystallized copolymer at an increasing temperature from 6°C to about 120°C. The polymer solution exiting the column is analyzed by infrared spectroscopy or NMR to determine the composition distribution of the copolymer.
Description
1 Field of the Invention 2 The present invention relates to the solvent fractionation 3 of a polymer. More specifically, the invention relates to the 4 fractionation of a copolymer with a single solvent at different temperatures.
6 Background 7 Crystalline copolymers, such as linear, low density poly-8 ethylene (LLDPE) and ethylene vinyl acetate (EVA), are known to have 9 molecular weight distributions and composition distributions. The properties of copolymers having similar average compositions can vary 11 considerably depending upon the compositional distribution of the 12 copolymer. For example, in co-pending Canadian application 13 serial number 553J796 filed 12/8/87, it 14 was established that the molecular weight distribution for Exxon LL3001 linear low density polyethylene resin was narrower than the 16 molecular weight distribution of another commercially available 17 linear low density polyethylene. Compositional distributions are 18 known to have a strong effect on the physical properties of co-19 polymers, e.g., heat sealing, tear strength, and FDA extraction limits.
21 The molecular weight and compositional distributions of 22 copolymers have been determined by solvent fractionation of the 23 crystalline copolymer and analysis of the fractions for molecular 24 weight and composition. Apparatus for solvent fractionating of copolymers are known in the art. Such apparatus typically operate by 26 dissolving the copolymer in a hot solvent and allowing the solvent to 27 cool to ambient temperature within a packed column. The copolymer 28 crystallizes on the column packing as the polymer cools. It is known 29 in the art to cool the polymer to slightly above ambient temperature, about 30C, before starting fractionation with pure solvent.
31 Fractionation of the crystallized polymer is typically 32 conducted with a single solvent that is passed through the column at 33 increasing column temperatures beginning at the lowest temperature 34 obtained during cooling of the copolymer. Less soluble fractions of the copolymer are dissolved and removed from the column as the column 36 temperature rises such that the solvent effluent from the column 37 contain1ng dissolved copolymer can be collected in consecutive - 2 - l 3 3 5 0 7 2 1 fractions which are identified by a starting and ending column 2 temperature. These fractions are then analyzed for molecular weight 3 distribution and monomer composition by conventional means.
4 Summary of the Invention The present invention is a method for determining the 6 compositional distributions of a crystalline copolymer comprising the 7 steps of dissolving the copolymer in a solvent at elevated 8 temperature, filling a column with the solvent containing the g dissolved copolymer, crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature, 11 e.g. to temperatures at least about 6C or lower, initially passing 12 pure solvent through the column at a constant temperature below 13 ambient to determine the amount of uncrystallized copolymer, and then 14 at increasing temperature to gradually dissolve the copolymer, continuously measuring the concentration of the copolymer in the 16 solvent exiting the column. The method is preferably conducted with 17 a fractionation temperature range of from 0 to 120C and with 18 tetrachloroethylene as the solvent. The effluent from the 19 fractionation column is preferably continuously analyzed by an IR
detector to determine the concentration of polymer in the solvent.
21 Brief Description of the Drawings 22 Figure l is a schematic diagram of the sample preparation 23 mode for an apparatus which can determine the solubility distribution 24 curve of a crystalline polymer in accordance with the method of the present invention;
26 Figure 2 shows the apparatus of Figure l in the solvent 27 fractionation mode;
28 Figure 3 is an exemplary solubility distribution curve which 29 was generated by the method of the present invention; and B0 Figure 4 is another exemplary solubility distribution curve 31 generated by the method of the present invention.
32 Detailed Descri~tion of a Preferred Embodiment 33 The method of the present invention has been practiced with 34 an apparatus that automatically determines the solubility distribution curve of a crystalline copolymer. Referring to Figure 36 l, a steel column is packed with glass beads (approximately 35 mesh) 37 and immersed in an oil bath lO. A column having an inside diameter 38 of 35 mm and a length of 400 mm has worked well. The temperature of - 3 - l 335072 1 the oil bath can be programmed over any desirable temperature range, 2 e.g. from below ambient, preferably about or below 6C, or about or 3 below -12C, although even lower temperatures may be employed, to a 4 temperature up to about 150C. Solvent used in the fractionation may be prevented from boiling by operating the apparatus at about 3 6 atmospheres pressure. A weighed amount of sample, usually about 1.6 7 grams, is placed in a sample preparation chamber 20, th~t is then 8 sealed and repeatedly evacuated and filled with argon. A metered 9 volume of solvent 30, preferably tetrachloroethylene, is then pumped through a three-way valve 32 into the sample preparation chamber 20 11 where it is stirred and heated to obtain a solution of about l 12 percent concentration. A metered volume of this solution, usually 13 about lO0 cc, is then pumped into the packed column 2 which has been 14 thermostated at a high temperature of usually at least about 120C.
The polymer solution sample is subsequently crystal!ized by 16 cooling the polymer in the column 2 at a programmed rate of 5C per 17 hour to below ambient temperature in order to increase the proportion 18 of the polymer crystallized, e.g., to below or about 6C. However, 19 some polymers may require lower crystallization temperatures, e.g.
about or below -6C or -12C. The column 2 is then maintained at 21 this low temperature for at least an hour. Thereafter, the elution 22 of fractionation stage shown in Figure 2 is started by pumping pure 23 solvent 30 through the column 2 at the rate of 6 cc per minute.
24 Effluent from the column 2 passes through a reheater 40 where it is heated to 120C before passing through an IR detector 50 which is 26 used to measure the absorbance of the effluent stream. The infrared 27 absorbance of the polymer carbon-hydrogen stretching bands at about 28 2960 cm~l serves as a continuous measure of the relative 29 concentration of polymer in the effluent. After passing through the infrared detector 50 the temperature of the effluent is reduced to 31 about 110C and the pressure is reduced to l atmosphere before 32 passing the stream into an automatic fraction collection 60.
33 In the elution stage, the pure solvent is initially pumped 34 through the column 2 at the low initial temperature for one hour.
This serves to flush polymer that has not crystallized during the 36 crystallization stage out of the column 2 so that the percent of 37 uncrystallized polymer can be determined from the infrared trace.
38 The temperature is then programmed upward at 10C per hour to 100C
_ 4 _ 1 335072 1 and at 20C per hour from lO0C to 120C.
2 The compositions of fractions obtained from the various 3 polymers are determined by infrared spectroscopy. The IR
4 compositions are obtained from the intensity of the l378 cm~l methyl band, the thickness of the sample, and a calibration curve 6 based on samples whose compositions can be determined independently 7 by Cl3 NMR. No corrections for polymer end groups is usually made 8 in obtaining compositions from infrared data.
g Example l An example of a solubility distribution obtained from a 11 typical LLDPE sample, Dow 2045 [poly(ethylene-co-octene), 0.9l8 g/cc, 12 melt index l.0] obtained using the procedure of the invention 13 described above is shown in Figure 3. A composition scale obtained 14 by analysis of fractions from poly(ethylene-co-butene), poly(ethylene-co-hexene) and poly(ethylene-co-octene) eluted at 16 various temperatures is also shown in Figure 3.
17 As seen in Figure 3, the solubility versus temperature 18 distributions for the polymer has a peak for the 6C first-hour 19 elution temperature. This initial peak represents the fraction of total polymer that is not crystallizable at the lowest temperature of 21 the experiment (about 6C). The typical run length for a sample is 22 about 40 hours.
23 Example 2 24 Another example of a solubility distribution and composition distribution is shown in Fiqure 4. The polymer sample was Mitsui 26 Petrochemical Company Tafmoer A4085TM poly(ethylene- co-butene, density 27 ~0.88 g/cc, melt index lØ The curve was obtained according to 28 the invention using the procedures described above. This example 29 illustrates the importance of elution at sub-ambient temperature since only a small portion of this sample would have been resolved by 31 elution only at 30C and above as done in the prior art.
32 The apparatus and method described above provide a plot of 33 concentration of polymer versus elution temperature. The fractions 34 of solvent containing dissolved copolymer can then be analyzed by conventional means for molecular weight and composition to establish 36 the molecular weight distribution and composition distribution of 37 monomer. Alternatively to determining the monomer composition for 38 each fraction, a calibration curve relating elution temperature to _ 5 _ 1 3 3 5 0 7 2 1 monomer composition can be generally derived for specific comonomers.
2 The foregoing description is illustrative and explanatory of 3 the invention and is not intended to limit the invention to the 4 specific embodiment that is described.
6 Background 7 Crystalline copolymers, such as linear, low density poly-8 ethylene (LLDPE) and ethylene vinyl acetate (EVA), are known to have 9 molecular weight distributions and composition distributions. The properties of copolymers having similar average compositions can vary 11 considerably depending upon the compositional distribution of the 12 copolymer. For example, in co-pending Canadian application 13 serial number 553J796 filed 12/8/87, it 14 was established that the molecular weight distribution for Exxon LL3001 linear low density polyethylene resin was narrower than the 16 molecular weight distribution of another commercially available 17 linear low density polyethylene. Compositional distributions are 18 known to have a strong effect on the physical properties of co-19 polymers, e.g., heat sealing, tear strength, and FDA extraction limits.
21 The molecular weight and compositional distributions of 22 copolymers have been determined by solvent fractionation of the 23 crystalline copolymer and analysis of the fractions for molecular 24 weight and composition. Apparatus for solvent fractionating of copolymers are known in the art. Such apparatus typically operate by 26 dissolving the copolymer in a hot solvent and allowing the solvent to 27 cool to ambient temperature within a packed column. The copolymer 28 crystallizes on the column packing as the polymer cools. It is known 29 in the art to cool the polymer to slightly above ambient temperature, about 30C, before starting fractionation with pure solvent.
31 Fractionation of the crystallized polymer is typically 32 conducted with a single solvent that is passed through the column at 33 increasing column temperatures beginning at the lowest temperature 34 obtained during cooling of the copolymer. Less soluble fractions of the copolymer are dissolved and removed from the column as the column 36 temperature rises such that the solvent effluent from the column 37 contain1ng dissolved copolymer can be collected in consecutive - 2 - l 3 3 5 0 7 2 1 fractions which are identified by a starting and ending column 2 temperature. These fractions are then analyzed for molecular weight 3 distribution and monomer composition by conventional means.
4 Summary of the Invention The present invention is a method for determining the 6 compositional distributions of a crystalline copolymer comprising the 7 steps of dissolving the copolymer in a solvent at elevated 8 temperature, filling a column with the solvent containing the g dissolved copolymer, crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature, 11 e.g. to temperatures at least about 6C or lower, initially passing 12 pure solvent through the column at a constant temperature below 13 ambient to determine the amount of uncrystallized copolymer, and then 14 at increasing temperature to gradually dissolve the copolymer, continuously measuring the concentration of the copolymer in the 16 solvent exiting the column. The method is preferably conducted with 17 a fractionation temperature range of from 0 to 120C and with 18 tetrachloroethylene as the solvent. The effluent from the 19 fractionation column is preferably continuously analyzed by an IR
detector to determine the concentration of polymer in the solvent.
21 Brief Description of the Drawings 22 Figure l is a schematic diagram of the sample preparation 23 mode for an apparatus which can determine the solubility distribution 24 curve of a crystalline polymer in accordance with the method of the present invention;
26 Figure 2 shows the apparatus of Figure l in the solvent 27 fractionation mode;
28 Figure 3 is an exemplary solubility distribution curve which 29 was generated by the method of the present invention; and B0 Figure 4 is another exemplary solubility distribution curve 31 generated by the method of the present invention.
32 Detailed Descri~tion of a Preferred Embodiment 33 The method of the present invention has been practiced with 34 an apparatus that automatically determines the solubility distribution curve of a crystalline copolymer. Referring to Figure 36 l, a steel column is packed with glass beads (approximately 35 mesh) 37 and immersed in an oil bath lO. A column having an inside diameter 38 of 35 mm and a length of 400 mm has worked well. The temperature of - 3 - l 335072 1 the oil bath can be programmed over any desirable temperature range, 2 e.g. from below ambient, preferably about or below 6C, or about or 3 below -12C, although even lower temperatures may be employed, to a 4 temperature up to about 150C. Solvent used in the fractionation may be prevented from boiling by operating the apparatus at about 3 6 atmospheres pressure. A weighed amount of sample, usually about 1.6 7 grams, is placed in a sample preparation chamber 20, th~t is then 8 sealed and repeatedly evacuated and filled with argon. A metered 9 volume of solvent 30, preferably tetrachloroethylene, is then pumped through a three-way valve 32 into the sample preparation chamber 20 11 where it is stirred and heated to obtain a solution of about l 12 percent concentration. A metered volume of this solution, usually 13 about lO0 cc, is then pumped into the packed column 2 which has been 14 thermostated at a high temperature of usually at least about 120C.
The polymer solution sample is subsequently crystal!ized by 16 cooling the polymer in the column 2 at a programmed rate of 5C per 17 hour to below ambient temperature in order to increase the proportion 18 of the polymer crystallized, e.g., to below or about 6C. However, 19 some polymers may require lower crystallization temperatures, e.g.
about or below -6C or -12C. The column 2 is then maintained at 21 this low temperature for at least an hour. Thereafter, the elution 22 of fractionation stage shown in Figure 2 is started by pumping pure 23 solvent 30 through the column 2 at the rate of 6 cc per minute.
24 Effluent from the column 2 passes through a reheater 40 where it is heated to 120C before passing through an IR detector 50 which is 26 used to measure the absorbance of the effluent stream. The infrared 27 absorbance of the polymer carbon-hydrogen stretching bands at about 28 2960 cm~l serves as a continuous measure of the relative 29 concentration of polymer in the effluent. After passing through the infrared detector 50 the temperature of the effluent is reduced to 31 about 110C and the pressure is reduced to l atmosphere before 32 passing the stream into an automatic fraction collection 60.
33 In the elution stage, the pure solvent is initially pumped 34 through the column 2 at the low initial temperature for one hour.
This serves to flush polymer that has not crystallized during the 36 crystallization stage out of the column 2 so that the percent of 37 uncrystallized polymer can be determined from the infrared trace.
38 The temperature is then programmed upward at 10C per hour to 100C
_ 4 _ 1 335072 1 and at 20C per hour from lO0C to 120C.
2 The compositions of fractions obtained from the various 3 polymers are determined by infrared spectroscopy. The IR
4 compositions are obtained from the intensity of the l378 cm~l methyl band, the thickness of the sample, and a calibration curve 6 based on samples whose compositions can be determined independently 7 by Cl3 NMR. No corrections for polymer end groups is usually made 8 in obtaining compositions from infrared data.
g Example l An example of a solubility distribution obtained from a 11 typical LLDPE sample, Dow 2045 [poly(ethylene-co-octene), 0.9l8 g/cc, 12 melt index l.0] obtained using the procedure of the invention 13 described above is shown in Figure 3. A composition scale obtained 14 by analysis of fractions from poly(ethylene-co-butene), poly(ethylene-co-hexene) and poly(ethylene-co-octene) eluted at 16 various temperatures is also shown in Figure 3.
17 As seen in Figure 3, the solubility versus temperature 18 distributions for the polymer has a peak for the 6C first-hour 19 elution temperature. This initial peak represents the fraction of total polymer that is not crystallizable at the lowest temperature of 21 the experiment (about 6C). The typical run length for a sample is 22 about 40 hours.
23 Example 2 24 Another example of a solubility distribution and composition distribution is shown in Fiqure 4. The polymer sample was Mitsui 26 Petrochemical Company Tafmoer A4085TM poly(ethylene- co-butene, density 27 ~0.88 g/cc, melt index lØ The curve was obtained according to 28 the invention using the procedures described above. This example 29 illustrates the importance of elution at sub-ambient temperature since only a small portion of this sample would have been resolved by 31 elution only at 30C and above as done in the prior art.
32 The apparatus and method described above provide a plot of 33 concentration of polymer versus elution temperature. The fractions 34 of solvent containing dissolved copolymer can then be analyzed by conventional means for molecular weight and composition to establish 36 the molecular weight distribution and composition distribution of 37 monomer. Alternatively to determining the monomer composition for 38 each fraction, a calibration curve relating elution temperature to _ 5 _ 1 3 3 5 0 7 2 1 monomer composition can be generally derived for specific comonomers.
2 The foregoing description is illustrative and explanatory of 3 the invention and is not intended to limit the invention to the 4 specific embodiment that is described.
Claims (11)
1. A method for determining the solubility distribution of a crystalline copolymer, comprising the steps of:
dissolving the copolymer in a solvent at elevated temperature;
filling a column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature;
passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer; and continuously measuring the concentration of the copolymer in the solvent exiting the column.
dissolving the copolymer in a solvent at elevated temperature;
filling a column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature;
passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer; and continuously measuring the concentration of the copolymer in the solvent exiting the column.
2. The method of claim 1, wherein the solvent is tetrachloroethylene.
3. The method of claim 1, wherein the pure solvent is passed through the column below ambient temperature to substantially remove uncrystallized polymer prior to increasing the column temperature.
4. The method of claim 1, wherein the column temperature is increased from about 6°C to about 150°C.
5. The method of claim 1, further comprising the steps of:
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and monomer composition.
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and monomer composition.
6. A method for determining the solubility distribution and composition distribution of a crystalline copolymer, comprising the steps of:
dissolving the copolymer in a solvent at elevated temperature;
filling a packed column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to below or about 6°C;
passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer;
continuously measuring the concentration of the copolymer in the solvent exiting the column;
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and monomer composition.
dissolving the copolymer in a solvent at elevated temperature;
filling a packed column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to below or about 6°C;
passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer;
continuously measuring the concentration of the copolymer in the solvent exiting the column;
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and monomer composition.
7. The method of claim 6, wherein the solvent is tetrachloroethylene.
8. The method of claim 6, wherein the pure solvent is passed through the column at or below about 6°C for at least one hour to remove uncrystallized polymer prior to increasing the column temperature.
9. The method of claim 6, wherein the column temperature is increased from about 6°C to about 150°C.
10. A method for determining the solubility distribution and composition distribution of a crystalline copolymer, comprising the steps of:
dissolving the copolymer in a solvent at elevated temperatures;
filling a column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to about 0°C;
passing pure solvent through the column at 0°C for at least an hour to remove uncrystallized polymer;
passing pure solvent through the column at an increasing column temperature of from about 0°C to about 150°C to gradually dissolve the crystallized copolymer;
continuously measuring the concentration of the copolymer in the solvent exiting the column;
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and composition.
dissolving the copolymer in a solvent at elevated temperatures;
filling a column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to about 0°C;
passing pure solvent through the column at 0°C for at least an hour to remove uncrystallized polymer;
passing pure solvent through the column at an increasing column temperature of from about 0°C to about 150°C to gradually dissolve the crystallized copolymer;
continuously measuring the concentration of the copolymer in the solvent exiting the column;
collecting the solvent exiting the column in fractions;
and analyzing the solvent fractions for molecular weight and composition.
11. The method of claim 10, wherein the solvent is tetrachloroethylene.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US151,350 | 1988-02-02 | ||
| US07/151,350 US5008204A (en) | 1988-02-02 | 1988-02-02 | Method for determining the compositional distribution of a crystalline copolymer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1335072C true CA1335072C (en) | 1995-04-04 |
Family
ID=22538364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000589676A Expired - Fee Related CA1335072C (en) | 1988-02-02 | 1989-01-31 | Method for determining the compositional distribution of a crystalline copolymer |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US5008204A (en) |
| EP (1) | EP0327368B1 (en) |
| JP (1) | JP2684082B2 (en) |
| CA (1) | CA1335072C (en) |
| DE (1) | DE68920166T2 (en) |
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|---|---|---|---|---|
| DE4104075C1 (en) * | 1991-02-11 | 1992-03-19 | Bruker Analytische Messtechnik Gmbh, 7512 Rheinstetten, De | |
| US5445894A (en) * | 1991-04-22 | 1995-08-29 | Dow Corning Corporation | Ceramic coatings |
| US5222390A (en) * | 1991-09-20 | 1993-06-29 | The Dow Chemical Company | Crystallization analysis fractionization |
| US6143854A (en) | 1993-08-06 | 2000-11-07 | Exxon Chemical Patents, Inc. | Polymerization catalysts, their production and use |
| GB9226616D0 (en) * | 1992-12-21 | 1993-02-17 | Printed Forms Equip | Pressure sealing machine and method |
| US6448341B1 (en) | 1993-01-29 | 2002-09-10 | The Dow Chemical Company | Ethylene interpolymer blend compositions |
| PL175108B1 (en) * | 1993-01-29 | 1998-11-30 | Dow Chemical Co | Ethylene interpolymerisation |
| US5929128A (en) | 1993-08-18 | 1999-07-27 | The Dow Chemical Company | Gaskets made from olefin polymers |
| US6506866B2 (en) * | 1994-11-17 | 2003-01-14 | Dow Global Technologies Inc. | Ethylene copolymer compositions |
| US7153909B2 (en) * | 1994-11-17 | 2006-12-26 | Dow Global Technologies Inc. | High density ethylene homopolymers and blend compositions |
| US5869575A (en) * | 1995-08-02 | 1999-02-09 | The Dow Chemical Company | Ethylene interpolymerizations |
| US6723398B1 (en) | 1999-11-01 | 2004-04-20 | Dow Global Technologies Inc. | Polymer blend and fabricated article made from diverse ethylene interpolymers |
| JPH09309926A (en) * | 1996-05-17 | 1997-12-02 | Dow Chem Co:The | Production of ethylene copolymer |
| ES2158567T3 (en) | 1996-06-17 | 2001-09-01 | Exxonmobil Chem Patents Inc | CATALYTIC SYSTEMS OF MIXED TRANSITION METALS FOR THE POLYMERIZATION OF OLEFINS. |
| US6258308B1 (en) | 1996-07-31 | 2001-07-10 | Exxon Chemical Patents Inc. | Process for adjusting WVTR and other properties of a polyolefin film |
| USH2000H1 (en) * | 1996-08-01 | 2001-11-06 | Exxon Chemical Patents, Inc. | Method for making polyolefin/filler films having increased WVTR |
| US5849823A (en) * | 1996-09-04 | 1998-12-15 | The Dow Chemical Company | Homogeneously branched ethylene α-olefin interpolymer compositions for use in gasket applications |
| US5902854A (en) * | 1996-09-27 | 1999-05-11 | The Dow Chemical Company | Polydimethylsiloxane containing polymer blends |
| US6812289B2 (en) | 1996-12-12 | 2004-11-02 | Dow Global Technologies Inc. | Cast stretch film of interpolymer compositions |
| US20030211280A1 (en) | 1997-02-28 | 2003-11-13 | Shaw Industries, Inc. | Carpet, carpet backings and methods |
| US7338698B1 (en) * | 1997-02-28 | 2008-03-04 | Columbia Insurance Company | Homogeneously branched ethylene polymer carpet, carpet backing and method for making same |
| WO1998038375A2 (en) * | 1997-02-28 | 1998-09-03 | Shaw Industries, Inc. | Carpet, carpet backings and methods |
| US6255426B1 (en) | 1997-04-01 | 2001-07-03 | Exxon Chemical Patents, Inc. | Easy processing linear low density polyethylene |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3963799A (en) * | 1974-11-13 | 1976-06-15 | E. I. Du Pont De Nemours And Company | Graft copolymer in polyamide polyethylene blends |
| US4515992A (en) * | 1983-05-10 | 1985-05-07 | Commscope Company | Cable with corrosion inhibiting adhesive |
| IN172494B (en) * | 1986-12-19 | 1993-09-04 | Exxon Chemical Patents Inc | |
| GB2184368A (en) * | 1985-11-27 | 1987-06-24 | Dow Chemical Co | High temperature continuous viscometry coupled with analytic temperature rising elution fractionation for evaluating crystalline and semi-crystalline polymers |
| US4798081A (en) * | 1985-11-27 | 1989-01-17 | The Dow Chemical Company | High temperature continuous viscometry coupled with analytic temperature rising elution fractionation for evaluating crystalline and semi-crystalline polymers |
-
1988
- 1988-02-02 US US07/151,350 patent/US5008204A/en not_active Expired - Fee Related
-
1989
- 1989-01-31 CA CA000589676A patent/CA1335072C/en not_active Expired - Fee Related
- 1989-02-01 JP JP1020978A patent/JP2684082B2/en not_active Expired - Lifetime
- 1989-02-02 DE DE68920166T patent/DE68920166T2/en not_active Expired - Fee Related
- 1989-02-02 EP EP89301018A patent/EP0327368B1/en not_active Expired - Lifetime
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|---|---|
| DE68920166T2 (en) | 1995-05-11 |
| EP0327368A2 (en) | 1989-08-09 |
| EP0327368B1 (en) | 1994-12-28 |
| JPH02193049A (en) | 1990-07-30 |
| DE68920166D1 (en) | 1995-02-09 |
| JP2684082B2 (en) | 1997-12-03 |
| US5008204A (en) | 1991-04-16 |
| EP0327368A3 (en) | 1991-03-06 |
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