DE2720020A1 - Paper coating compsn. contg. pigment and binder - and condensate of epihalohydrin and aliphatic amine to improve properties, e.g. brightness - Google Patents

Abstract

Compsn. comprises an aq. dispersion contg. (a) 0.01-10 (0.05-2.5) pts. wt. condensation prod. (I) of >1 epihalohydrin (II) and >=1 aliphatic 1-6C amine (II); (b) 100 pts. wt. pigment, esp. clay, (c) 5-100 pts. wt. binder, esp. case -in, and other opt. additives. Pref. (II) is epichlorohydrin, epibromohydrin and/or epiiodohydrin. Pref. (III) are MeNH2, Me2NH, EtNH2, Et2NH (hexam)ethylene diamine, Nme, Net3 and allylamine. Addn. of (I) improves brightness, offset printing properties, drying rate of printing ink and light-stability of coated material.

Description

Composition for coating paper

The invention relates to a composition for coating paper.

To increase the brightness of coated paper, cardboard or Cardboard has previously been a larger amount of a fluorescent brightener or in alternatively, a pigment of greater brightness used selectively or in some Cases, the amount of a brightener is increased significantly.

Should the suitability for offset printing and the drying speed the printing ink is to be improved, etc., an appropriate selection of a pigment must be made and a binding agent as well as precise control of their proportions be respected. Consequently, it requires an economic reconciliation of costs such a coated one Paper or cardboard with the quality not only considerable experience, but also the use of expensive raw materials.

So if it turns out to be possible, the improvement the quality of such a coated paper or cardboard only through the addition of a small amount of an additive to a composition for coating bring about a significant economic advantage would result. There has therefore been a need for such an additive for a long time.

The object of the invention is therefore to provide a composition for coating of paper, cardboard or paperboard to be provided due to only a small amount of additive to improve the brightness, offset printing suitability, drying rate of the printing ink and light resistance of the coated material.

The solution to the problem according to the invention results from the claims.

It has been found that a condensation product of an epihalohydrin with a certain type of aliphatic amine to achieve the task at hand leads, even if it is only used in very small quantities. The invention is based on this result.

An aqueous dispersion comprising a pigment, a binder and a Condensation product of an epihalohydrin and an aliphatic amine with 1-6 Containing carbon atoms gives an excellent coating composition of paper. When applied to a base or carrier paper, it results in a coated one Paper of improved brightness, suitability for offset printing, drying rate of the printing fiber and lightfastness.

The composition according to the invention for coating paper contains a condensation product of an epihalohydrin and an aliphatic amine in addition to a pigment and a binder. The composition of the invention for Coating of paper is made by adding a condensation product, that by reacting 1 or 2 or more Upihalohydrinen with 1 or 2 or several aliphatic amines with 1 - 6 carbon atoms is obtained into one A coating composition comprising a pigment and a binder. Will the composition according to the invention for coating applied to a paper, eo this improves the brightness, the suitability for offset printing, the drying rate a printing ink and the light resistance of the coated paper obtained.

The epihalohydrins which can expediently be used in the invention include epichlorohydrin, epibromohydrin, epiiodohydrin, and ß-allcylepihalohydrins.

Of these, epichlorohydrin is most preferred. The application Amines useful in the invention include aliphatic amines having 1-6 carbon atoms such as, for example, methylamine, dimethylamine, ethylenediamine, hexamethylenediamine, trimethylamine, Triethylamine, allylamine and the like. Of these, aliphatic amines with 1 - 2 carbon atoms most preferred. It should be noted that similar condensation products, those using aliphatic amines having 7 or more carbon atoms or aromatic amines are not obtained into a composition for coating lead, when applied to paper, to improve the brightness, the suitability for offset printing, the drying rate of printing inks, lightfastness and similar properties of the coated paper.

All known binders can be used, including the Natural products such as casein, starch, soybean protein, pretoleum protein and the like, and also synthetic materials such as polyvinyl alcohol, acrylic resins and the like. Usable latices include all of the known such as for example those made of styrene-butadiene, acrylic compounds, vinyl acetate compounds and the like. All known inorganic and organic pigments, including Titanium dioxide, calcium carbonate, lime, satin white and similar inorganic pigments, as well as organic pigments such as polystyrene particles and urea fine particles etc., although clay is most preferred.

Preferably, the amount of the epihalohydrin and the amine should be Mole basis be essentially the same. According to the invention, the above-mentioned condensation product of the F: pihydrins and the amine of a composition of normal formulation for coating added, which contains a pigment, a binder and water, whereby the invention Coating composition is obtained which improves the brightness, suitability for offset printing, the drying rate of printing inks and lightfastness of coated paper, which is ensured by applying this coating composition is obtained on base paper or backing paper.

The amount of the condensation product of the epihalohydrin and the aliphatic amine with 1 - 6 carbon atoms can be in the range of 0, 01 10 parts by weight, preferably in the range of 0.05-2.5 parts by weight per 100 parts by weight of the Pigments lie. The amounts of the other ingredients, including pigments, binders and the like can be in the same range as that of normal coating compositions is common practice for similar purposes.

Based on the following examples, the invention is intended to be even more detailed explained.

Example 1 (a) Preparation of the condensation product: In one with 3-necked flasks fitted with a reflux condenser added 50 parts by weight of epichlorohydrin introduced and then 60.8 parts by weight (24.3 parts by weight of solid material) Dimethylamine added.

Since it was an exothermic reaction, the reaction system became cooled with stirring to bathe the temperature to 50 ° C.

After four hours of the reaction, it became a syrupy condensation product (1) received. To this product was added water until it became an aqueous dispersion with a solids content of 50%.

(b) Preparation of the composition for coating and the coated one Paper by applying the composition: According to the recipe given below a slurry of clay in water was made. It became 60 parts by weight Water, 0.5 part by weight of a 40% aqueous solution of a dispersing agent and 0.1 parts by weight of sodium hydroxide introduced into a mixer, after which 100 Parts by weight of clay were added with continuous stirring to ensure good To obtain dispersion. Thereafter, this dispersion was made with continuous stirring 47 parts by weight (7 parts by weight of solid substance) of a 15% strength aqueous solution of casein made by dissolving casein in an aqueous ammonia solution with 4% ammonia based on the amount of casein produced, and 1.4 parts by weight (0.7 parts by weight of solid substance) of the condensation product (1) was added.

Subsequently, 24 parts by weight (12 parts by weight Solid substance) styrene-butadiene-latex added. Finally, through the Adding water to obtain an aqueous dispersion with a solids content of 42%.

Recipe water 60 parts by weight of 40% aqueous solution of the dispersing agent (Sodium polycarboxylate) 0.5 parts by weight clay 100 parts by weight casein 7 parts by weight Sodium hydroxide 0.1 part by weight of condensation product (1) 1.4 parts by weight (0, 7 parts by weight solids content) 28% aqueous ammonia solution 1 part by weight Styrene-butadiene-latex 24 parts by weight (12 parts by weight solids content) For The aqueous dispersion thus obtained was filtered through a wire screen with a mesh size of 0.149 mm (100 mesh) passed through to finally the To give composition according to the invention for coating paper.

After that, the final composition was made onto a release paper a basis weight of 350 g / m² with a laboratory air knife coater applied to give a coating of approximately 15 g / m2.

The coated paper produced in this way was stored overnight in a room with a constant temperature of 250 ° C. and a constant humidity of 65% relative humidity. Thereafter, the coated paper was calendered at a temperature of 6 (PC and at a linear pressure of 85 kg / cm) before being subjected to a series of test methods given below. The results of these test methods are given in Table 1. The Brightness, the suitability for offset printing, the speed of drying of printing inks and the light fastness were determined according to the following methods: Table 1 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Brightness (%) 77.6 77.5 77.3 77.5 77.4 77.5 Offset printing- Excellent- Excellent- Excellent- Excellent- Excellent- suitability net net net net net net Drying speed 20 20 20 20 20 20 of printing ink (min) Lightfastness (% Decrease) 5.2 5.3 5.3 5.2 5.1 5.2 Comparative comparative comparative comparative comparative comparative comparative example 1 example 2 example 3 example 4 example 5 example 6 example 7 Brightness (%) 75.5 75.4 74.1 75.0 75.2 74.5 75.5 Offset printing- good satisfied- bad bad good bad good fitness gend Drying speed 40 50 40 40 40 40 40 of printing ink of printing ink (min) lightfastness 6.4 6.7 6.6 6.6 6.5 6.2 6.3 (%) Acceptance (1) Helligkeil: GE brightness meter (2) Suitability for offset printing: A certain amount of water was made to adhere to the coated paper to be tested, after which the paper was immediately printed on in order to examine its ability to absorb the printing ink, which was determined by visual observation It was rated as "Excellent", "Good", "Satisfactory" and "Poor" (3) Drying speed of printing ink: 3 The coated paper was printed with 0.6 cm offset printing ink using an Ii I tester and after certain time intervals the Transferring ink to white paper. The experiment was terminated after no transfer of the printing ink was observed any more. The drying speed is the time in minutes that it takes to reach the endpoint described.

(4) Lightfastness: The decrease in brightness expressed as a percentage compared to the original brightness after 20 hours of irradiation 400C with the light of a UV charcoal arc.

Example 2 Following the same procedure as in Example 1 (a) the Condensation product (1) was produced, became a syrupy condensation product (2) obtained with the exception that 50 parts by weight of epichlorohydrin and 42 parts by weight (16.8 parts by weight solids content) methylamine were used. After that it was added water to the condensation product, uni a 50% aqueous dispersion of the solid material. After that, in the same way as in the example 1 (b! Described, a composition prepared for coating, with the exception that about 6.6 parts by weight (10 parts by weight solids content) one Starch-poìyvir, yl alcohol mixture as a binder (starch-polyvinyl alcohol = 1/1 on a weight basis) and 24 parts by weight (12 parts by weight solids content) acrylic latex were used as a latex component.

The composition for coating thus obtained was used for the production of coated paper applied to carrier paper, which the was subjected to the test procedure described in Example 1 (b). The test results can be seen from Table 1.

Example 3 In the same manner as described in Example 1 (a), a viscous condensation product (3) was produced, with the exception that 50 parts by weight of epichlorohydrin and 62.7 parts by weight of hexamethylenediamine are used became. Thereafter, the product was adjusted to pH 5 by adding stabilized by acetic acid. Thereafter, as described in Example 1 (b) Method, but using 1.0 part by weight of the condensation product described (3) instead of the condensation product (1) and also using 14 parts by weight (7 parts by weight solids content), an acrylic-like, alkali-swellable emulsion as a binder and 24 parts by weight (12 parts by weight solids content) vinyl acetate latex a composition for coating prepared as a latex component. The on this Thus obtained composition was applied to backing paper to be coated To give paper which is subjected to the series of tests already described became. The results are shown in Table 1.

Example 4 In the same manner as in Example 1 (a), except that 50 parts by weight of epibromohydrin and 26.6 parts by weight of diethylamine are used a syrupy condensation product (4) was produced. To the To stabilize the product obtained, acetic acid was added and the pH value set to 5. Thereafter, according to the procedure described in Example 1 (b), but using 1.2 parts by weight of the condensation product (4) instead of the condensation product (1) and using 46.7 parts by weight (7 parts by weight Solids content) styrene-maleic acid ester-acrylamide-acrylonitrile emulsion as a binder, a composition suitable for coating prepared. The composition was applied to cardboard in order to obtain a coated paper that already resembles the has been subjected to the test procedure mentioned. The test results are from the table 1 can be seen.

Example 5 A syrupy condensation product (5) was made in the same Hergellt manner as in Example 1 (a), with the exception that 50 parts by weight of dpichlorohydrin and 106 parts by weight (31.9 parts by weight solids content) of trimethylamine are used became. Thereafter, water was added to the condensation product to make an aqueous To give suspension with a solids content of 50%. After that, according to the procedure described in Example 1 (b) but using the one mentioned above Condensation product (5) in an amount of 1.8 parts by weight (0.8 parts by weight Solids content) instead of the condensation product (1) and using 47 parts by weight (7 parts by weight solids content) of a 15% strength aqueous solution of soybean protein, which is produced by dissolving soybean protein in aqueous ammonia solution with 4% ammonia, based on the amount of soybean protein, a composition suitable for coating is prepared. With this composition backing paper was coated and the coated paper obtained was already the subject to the test procedure described.

Example 6 In the same manner as described in Example 1 (a), with the exception that 25 parts by weight of epichlorohydrin, 35 parts by weight of epibromohydrin, 23.2 parts by weight (9.3 parts by weight of solids content) methylamine and 16.5 parts by weight Diethylamine were used, a syrupy condensation product (6) was produced. Thereafter, the product was added by adjusting its pH to 5 with Hydrochloric acid stabilized. Then water was added to the stabilized product, to give an aqueous dispersion with a solids content of 50%. Thereafter was made according to the procedure described in Example 1 (b) but using of 2.0 parts by weight (1.0 part by weight solids content) of the condensation product described (5) instead of the condensation product (1), a composition for the coating manufactured. Backing paper was coated with the composition to make a coated To result in paper which has been subjected to the series of test procedures described. The results are shown in Table 1.

Comparative Example 1 According to the recipe given in Example 1, a composition prepared for coating, but with the condensation product (1) has been omitted. In the same manner as in Example 1 (b), it was coated Paper produced and subjected to the test procedure described. The results can be seen from Table 1.

Comparative Example 2 The procedures given in Example 2 were repeated except that the condensation product (2) from the coating composition was omitted. The ones obtained on coated paper Test results, sse can be seen from Table 1.

Comparative Example 3 The procedures given in Example 3 were repeated except that the condensation product (3) from the on Paper applied coating composition was omitted. The test results can be seen from Table 1.

Comparative Example 4 The same procedures as in the example 5 were repeated, except that the condensation product (4) has been omitted from the coating composition. The most coated The test results obtained on paper are shown in Table 1.

Comparative Example 5 The same procedures as described in Example 5 were repeated except that the condensation product (5) from the coating composition was omitted. The test results obtained on the coated paper are from Table 1 can be seen.

Comparative Example 6 In the same manner as in Example 1 (a) described, with the exception that 50 parts by weight of epichlorohydrin and 69.7 parts of octylamine were used, a viscous condensation product (7) was produced. Thereafter, the procedures described in Example 3 were repeated, with the exception that instead of the condensation product (3) 1, 0 parts by weight of that described above Condensation product (7) were used to form a coating composition to give rise to a coated paper was produced. The test results can be seen from Table 1.

The test results given in Table 1 show that that by using the composition according to the invention for coating, that of a condensation product of an epihalohydrin and an aliphatic Amine, as well as a pigment and a binder, the brightness, the suitability for offset printing, the drying speed of printing ink and the lightfastness of the coated paper can be significantly improved

Claims (6)

Claims containing a composition for coating paper a condensation product of at least one epihalohydrin and at least one aliphatic amine having 1-6 carbon atoms, a pigment and a binder. 2. Composition according to claim 1, characterized in that -n e t the epihalohydrin from epichlorohydrin, epibromohydrin, epiiodohydrin or from one Mixture consists of it. 3. Composition according to claim 1, characterized in that the aliphatic amine from methylamine, dimethylamine, ethylamine, diethylamine, ethylenediamine, Hexamethylenediamine, trimethylamine, triethylamine or allylamines. 4. Composition according to claim 1, containing 0.01-10 parts by weight of the condensation product, 100 parts by weight of a pigment, 5-100 parts by weight a binder and optionally other additives. 5. The composition of claim 4, characterized in that the pigment is made of clay. 6. The composition of claim 4, characterized in that the binder consists of casein.