USRE30726E - Polymer film having linear tear properties - Google Patents
Polymer film having linear tear properties Download PDFInfo
- Publication number
- USRE30726E USRE30726E US06/082,992 US8299279A USRE30726E US RE30726 E USRE30726 E US RE30726E US 8299279 A US8299279 A US 8299279A US RE30726 E USRE30726 E US RE30726E
- Authority
- US
- United States
- Prior art keywords
- film
- polyethylene
- ionomer
- pouch
- extrusion
- 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 - Lifetime
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
- B29C48/335—Multiple annular extrusion nozzles in coaxial arrangement, e.g. for making multi-layered tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31938—Polymer of monoethylenically unsaturated hydrocarbon
Definitions
- a conventional method of forming polymer films is by blow extrusion, wherein the polymer is melted and forced through a circular die to produce a thin tube, which is inflated with a gas in the vicinity of the die and drawn away in a continuous process.
- Widely used polymers include low density polyethylene, usually modified with vinyl acetate, as well as ionomers, both of which provide a film having good heat sealing properties and excellent strength.
- the present invention is based on the discovery that a film made from certain blends of polyethylene and an ionomer, containing a particular minimum amount of either, unexpectedly exhibits excellent linear tear properties in the direction of extrusion.
- the polyethylene-ionomer film contains from about 12 to about 95% ionomer and from about 5 to about 88% polyethylene, the blends in such ranges providing films having excellent properties as well as excellent linear tear qualities in the direction of extrusion.
- ionomer resin and polyethylene resin are mixed together in dry form in the desired proportions, melted, and then extruded through die in the form of a tubing or sheet, which in the case of a tubing, is inflated with a gas in the area of extrusion.
- ionomer as used herein is characterized as a metal-containing ionic copolymer obtained by the reaction between ethylene or an alpha-olefin with an ethylenically unsaturated monocarboxylic acid such as acrylic or methacrylic acid wherein at least 10% of said carboxylic acid groups are neutralized by an alkali metal ion, and having a melting point range of from about 370° to 450° F.
- a suitable ionomer for making films is "SURLYN 1601" sold by E. I. DuPont De Nemours & Company.
- Such copolymers are more fully defined as ionic copolymers of a-olefins having the formula R--CH--CH 2 , where R is a radical selected from the class consisting of hydrogen and alkyl radicals having from 1 to 8 carbon atoms, and a,B-ethylenically unsaturated carboxylic acids having from 3 to 8 carbon atoms, said copolymers having from 10% to 90% of the carboxylic acid groups ionized by neutralization with metal ions uniformly distributed throughout the copolymer, said copolymer being a direct copolymer of the a-olefins and the unsaturated carboxylic acid in which the carboxylic acid groups are randomly distributed over all molecules and in which (1) the a-olefin content of the copolymer is at least 50 mol percent, based on the a-olefin-acid copolymer, (2) the unsaturated carboxylic acid content of the copolymer is from 0.2 to 25 mol percent,
- polyethylene resin includes polyethylene resins having a density in the range of from about 0.910 to about 0.960.
- the polyethylene may be modified to include from zero up to about 7.5% vinyl acetate as a copolymer, without adverse effect on the tear qualities of the resulting sheet.
- a suitable material is "Chemplex 3041" made by the Chemplex Corporation.
- the ionomer or polyethylene may be used as a base, and beyond a particular minimum amount of the other polymer must be added to impart the desired tear qualities to the resulting film.
- polyethylene is the base, a minimum of at least about 12% by weight of ionomer resin may be blended therewith to impart linear tear qualities.
- ionomer resin is used as the base, a minimum of at least about 5% by weight polyethylene must be added. Since all intermediate levels result in the desired characteristic, the polymer blend may contain from about 12% to about 95% ionomer and from about 5% to about 88% polyethylene, although up to about 7.5% of the polyethylene contribution may comprise vinyl acetate to improve puncture resistance.
- linear tear property means the inherent property or ability of the film to tear by hand along substantially a straight line, with less than about a 20°, and preferably less than 5° to 10° angle of deviation from said line after initiation of the tear.
- the tear is made by a normal shearing or parting motion without the necessity to guide or manipulate the direction of the tear along the line and without using guides or other external aids.
- the films of the present invention have the inherent quality of easily tearing in or parallel to the machine direction of the film in substantially a straight line.
- the degree of force required to make the tear is also a contributing factor of the present invention. If the tear strength, measured by the Elmendorf procedure, is substantially greater than 125 g, the film will offer excessive resistance to tearing, whereas too low a tear strength will result in a film that could too easily be torn accidentally during normal handling or use.
- the film of the present invention will exhibit a tear strength or a resistance to propagation of tear in the order of from about 30 g to about 125 g and preferably in the order of about 40 to about 100 grams, which is an ideal tear strength without encountering undue weakness or resistance to propagation of tear in the film.
- the mixture is preferably melted and blow extruded by conventional methods and at temperatures in the order of about 300° to about 425° F.
- the procedure results in the continuous production of tubular film, which may thereafter be slit longitudinally, cut into transverse sections, and heat sealed adjacent the transverse cuts to form an open end bag or pouch. Thereafter, any desired contents may be filled into the bag through the open end, and such end is then heat sealed.
- the film of the present invention may be cast in the form of a sheet by convention methods, and the linear tear property will still be exhibited in the machine direction.
- the side seams run perpendicular to the direction of extrusion, and the remaining open end of the pouch is considered as the top, with the printing, labels, etc., being applied in the same orientation, i.e., along lines parallel with the direction of extrusion.
- the product of the present invention lends itself to the production of a pouch having a linear tear property across the top or bottom of the pouch.
- the finished pouch may also be provided with a notch at either side to facilitate initiation of the tear, corresponding to the direction of extrusion.
- the pouch may be grasped at a top corner and easily torn open.
- a notch is typically provided on one or both sides of the pouch whereby the tear may be conveniently initiated from either side.
- the second ply may be composed of low density polyethylene, polyethylene modified with vinyl acetate or polyisobutylene, or ionomer, or a blend of ionomer and polyethylene falling outside of the linear tear range described herein.
- the second ply may comprise a blend containing polyethylene and less than 12% ionomer.
- a further benefit of the polymer composition of the present invention is that while the linear tear feature is exhibited, there is no detraction from the other properties that would normally be expected from the individual components. Thus, there is no loss of such properties such as stiffness modulus, impact strength or elongation, but rather an average of the properties of the individual components is realized.
- Example I Each of the samples of Example I was also tested for linear tear properties in machine direction based on the following criteria: less than 5° angular deviation from a straight line from side to side of the film, excellent (E); less than 20° deviation, good (G); and more than 30°, poor (P). The ratings for each sample are indicated adjacent the Elmendorf values in Table I.
Abstract
Description
TABLE I ______________________________________ Elmendorf Tear (gm.) (Remainder Poly- ethylene). % Vinyl % Surlyn Acetate 0 10 25 50 75 100 ______________________________________ Homo- --(P) 120(G) 64(E) 68(E) 82(E) 189(P) polymer 2% Vinyl 630(P) 130(G) 59(E) 71(E) 100(E) --(P) Acetate 4.5% Vinyl 300(P) 255(P) 76(G) 79(E) 88(E) --(P) Acetate 7.5% Vinyl --(P) 194(P) 67.6(P) 62(P) 84(G) --(P) Acetate ______________________________________
Claims (15)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/082,992 USRE30726E (en) | 1974-07-05 | 1979-10-09 | Polymer film having linear tear properties |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US48608274A | 1974-07-05 | 1974-07-05 | |
US05/713,703 US4098406A (en) | 1974-07-05 | 1976-08-12 | Polymer film having linear tear properties |
US06/082,992 USRE30726E (en) | 1974-07-05 | 1979-10-09 | Polymer film having linear tear properties |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US48608274A Continuation-In-Part | 1974-07-05 | 1974-07-05 | |
US05/713,703 Reissue US4098406A (en) | 1974-07-05 | 1976-08-12 | Polymer film having linear tear properties |
Publications (1)
Publication Number | Publication Date |
---|---|
USRE30726E true USRE30726E (en) | 1981-09-01 |
Family
ID=27374382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/082,992 Expired - Lifetime USRE30726E (en) | 1974-07-05 | 1979-10-09 | Polymer film having linear tear properties |
Country Status (1)
Country | Link |
---|---|
US (1) | USRE30726E (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095849A2 (en) * | 1982-05-20 | 1983-12-07 | Stiksack STS S.A. | Plastics film and bags and sacks therefrom |
US5046621A (en) * | 1988-03-17 | 1991-09-10 | Kapak Corporation | Tamper evident notched sealing envelope |
US5356677A (en) * | 1991-10-11 | 1994-10-18 | Sodap | Shrinkable thermoplastic packaging films |
US5409469A (en) * | 1993-11-04 | 1995-04-25 | Medtronic, Inc. | Introducer system having kink resistant splittable sheath |
US6479137B1 (en) | 2000-05-09 | 2002-11-12 | Exxon Mobil Oil Corporation | Controlled directional tear laminates |
US8633343B2 (en) | 2009-05-26 | 2014-01-21 | Exxonmobil Chemical Patents Inc. | Transalkylation of polycyclohexylbenzenes |
US8932725B2 (en) | 2010-07-29 | 2015-01-13 | Toray Plastics (America), Inc. | Heat sealable film with linear tear properties |
US8932726B2 (en) | 2010-07-29 | 2015-01-13 | Toray Plastics (America), Inc. | High barrier heat sealable film with linear tear properties |
US9669591B2 (en) | 2010-07-29 | 2017-06-06 | Toray Plastics (America), Inc. | Heat sealable film with linear tear properties |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3264272A (en) * | 1961-08-31 | 1966-08-02 | Du Pont | Ionic hydrocarbon polymers |
US3340091A (en) * | 1966-03-21 | 1967-09-05 | Morton Int Inc | Laminate of a polyolefin substrate and a surface coating of a copolymer of an olefin monomer and a polar monomer |
US3347957A (en) * | 1965-06-18 | 1967-10-17 | Continental Can Co | High-impact polypropylene composition containing ethylene/carboxylic acid salt copolymers |
US3365520A (en) * | 1965-05-27 | 1968-01-23 | Union Carbide Corp | Novel ethylene polymer compositions containing 1-olefin/carboxylic acid salt interpolymers |
US3422055A (en) * | 1961-04-27 | 1969-01-14 | Du Pont | Polyolefin compositions |
US3437718A (en) * | 1967-01-23 | 1969-04-08 | Du Pont | Polymer blends |
US3535409A (en) * | 1967-01-17 | 1970-10-20 | Tower Products | Method of making sheet material with film tear line |
US3552638A (en) * | 1968-08-14 | 1971-01-05 | Nat Distillers Chem Corp | Peel-open thermoplastic package for sterilized articles |
US3704157A (en) * | 1970-11-23 | 1972-11-28 | Du Pont | Coated article and method of making same |
US3709957A (en) * | 1964-09-02 | 1973-01-09 | Du Pont | Polyethylene blends of ethylenemethacrylic acid copolymer and polyethylene |
US3819792A (en) * | 1970-07-21 | 1974-06-25 | Toray Industries | Process for producing a thermoplastic shaped article having a double layered wall |
US3900635A (en) * | 1972-02-22 | 1975-08-19 | Union Carbide Corp | Multilayer shrinkable film for poultry bags |
US3923574A (en) * | 1969-06-24 | 1975-12-02 | Tenneco Chem | Method of bonding an ionomer film to a non-ionomer film using a polyalkyleneimine |
US3952073A (en) * | 1972-06-09 | 1976-04-20 | Toyo Boseki Kabushiki Kaisha | Film having good tear property on impact comprising polypropylene and an ethylene polymer |
US3988499A (en) * | 1975-01-20 | 1976-10-26 | Reynolds Thomas D | Storage bag and method for using same |
US4051993A (en) * | 1976-08-18 | 1977-10-04 | International Recreational Industries, Inc. | Popcorn package for two users |
US4188441A (en) * | 1976-02-17 | 1980-02-12 | Crown Zellerbach Corporation | Flexible packaging films of high density polyethylene capable of forming easily openable heatseals |
-
1979
- 1979-10-09 US US06/082,992 patent/USRE30726E/en not_active Expired - Lifetime
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3422055A (en) * | 1961-04-27 | 1969-01-14 | Du Pont | Polyolefin compositions |
US3264272A (en) * | 1961-08-31 | 1966-08-02 | Du Pont | Ionic hydrocarbon polymers |
US3709957A (en) * | 1964-09-02 | 1973-01-09 | Du Pont | Polyethylene blends of ethylenemethacrylic acid copolymer and polyethylene |
US3365520A (en) * | 1965-05-27 | 1968-01-23 | Union Carbide Corp | Novel ethylene polymer compositions containing 1-olefin/carboxylic acid salt interpolymers |
GB1145053A (en) | 1965-05-27 | 1969-03-12 | Union Carbide Corp | Novel ethylene polymer compositions |
US3347957A (en) * | 1965-06-18 | 1967-10-17 | Continental Can Co | High-impact polypropylene composition containing ethylene/carboxylic acid salt copolymers |
US3340091A (en) * | 1966-03-21 | 1967-09-05 | Morton Int Inc | Laminate of a polyolefin substrate and a surface coating of a copolymer of an olefin monomer and a polar monomer |
US3535409A (en) * | 1967-01-17 | 1970-10-20 | Tower Products | Method of making sheet material with film tear line |
US3437718A (en) * | 1967-01-23 | 1969-04-08 | Du Pont | Polymer blends |
US3552638A (en) * | 1968-08-14 | 1971-01-05 | Nat Distillers Chem Corp | Peel-open thermoplastic package for sterilized articles |
US3923574A (en) * | 1969-06-24 | 1975-12-02 | Tenneco Chem | Method of bonding an ionomer film to a non-ionomer film using a polyalkyleneimine |
US3819792A (en) * | 1970-07-21 | 1974-06-25 | Toray Industries | Process for producing a thermoplastic shaped article having a double layered wall |
US3704157A (en) * | 1970-11-23 | 1972-11-28 | Du Pont | Coated article and method of making same |
US3900635A (en) * | 1972-02-22 | 1975-08-19 | Union Carbide Corp | Multilayer shrinkable film for poultry bags |
US3952073A (en) * | 1972-06-09 | 1976-04-20 | Toyo Boseki Kabushiki Kaisha | Film having good tear property on impact comprising polypropylene and an ethylene polymer |
US3988499A (en) * | 1975-01-20 | 1976-10-26 | Reynolds Thomas D | Storage bag and method for using same |
US4188441A (en) * | 1976-02-17 | 1980-02-12 | Crown Zellerbach Corporation | Flexible packaging films of high density polyethylene capable of forming easily openable heatseals |
US4051993A (en) * | 1976-08-18 | 1977-10-04 | International Recreational Industries, Inc. | Popcorn package for two users |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0095849A2 (en) * | 1982-05-20 | 1983-12-07 | Stiksack STS S.A. | Plastics film and bags and sacks therefrom |
EP0095849B1 (en) * | 1982-05-20 | 1987-09-09 | Stiksack STS S.A. | Plastics film and bags and sacks therefrom |
US5046621A (en) * | 1988-03-17 | 1991-09-10 | Kapak Corporation | Tamper evident notched sealing envelope |
US5356677A (en) * | 1991-10-11 | 1994-10-18 | Sodap | Shrinkable thermoplastic packaging films |
US5409469A (en) * | 1993-11-04 | 1995-04-25 | Medtronic, Inc. | Introducer system having kink resistant splittable sheath |
US6479137B1 (en) | 2000-05-09 | 2002-11-12 | Exxon Mobil Oil Corporation | Controlled directional tear laminates |
US8633343B2 (en) | 2009-05-26 | 2014-01-21 | Exxonmobil Chemical Patents Inc. | Transalkylation of polycyclohexylbenzenes |
US8932725B2 (en) | 2010-07-29 | 2015-01-13 | Toray Plastics (America), Inc. | Heat sealable film with linear tear properties |
US8932726B2 (en) | 2010-07-29 | 2015-01-13 | Toray Plastics (America), Inc. | High barrier heat sealable film with linear tear properties |
US9399318B2 (en) | 2010-07-29 | 2016-07-26 | Toray Plastics (America), Inc. | High barrier heat sealable film with linear tear properties |
US9669591B2 (en) | 2010-07-29 | 2017-06-06 | Toray Plastics (America), Inc. | Heat sealable film with linear tear properties |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: TOWER PRODUCTS,INC. 1919 SOUTH BUTTERFIELD RD MUND Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TOWER PRODUCTS INC;REEL/FRAME:004035/0227 Effective date: 19820901 |
|
AS | Assignment |
Owner name: BAXTER TRAVENOL LABORATORIES, INC. A CORP. OF DE Free format text: MERGER;ASSIGNOR:AMERICAN HOSPITAL SUPPLY CORPORATION INTO;REEL/FRAME:004760/0345 Effective date: 19870126 |
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AS | Assignment |
Owner name: BAXTER INTERNATIONAL INC., ILLINOIS Free format text: CHANGE OF NAME;ASSIGNOR:BAXTER TRAVENOL LABORATOIRES, INC., A CORP. OF DE;REEL/FRAME:005053/0167 Effective date: 19881011 |
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