EP0402173A2
Expired / Lapsed
EP
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Enhanced thermally stable vinylidene chloride copolymer containing processing aid and extruded vinylidene chloride copolymer flexible packaging film
Assignee: WR Grace and Co Conn
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Filing: 1990-06-08
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Granted: —
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Expires: 2010-06-08
Abstract
Abstract This invention relates to films made from vinylidene chloride copolymers. Specifically, this invention relates to a method and composition for lowering the oxygen permeability and enhancing the thermal stability and enhancing the melt shear stability of packaging films having a layer of vinylidene chloride copolymer film of low molecular weight. The conventional stabilizer/plasticizer combination of expoxy resin and 2-ethyl-hexyl diphenyl phosphate may be employed with the vinylidene chloride copolymer. The layer of vinylidene chloride copolymer can be as thin as 4.57 micron (0.18 mil).
Inventors
- 👤 Ronald Dean Moffitt
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 16:05
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B29; B29C; B29C48/00; B29C48/001; B29C48/0018; B29C48/022; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B32B27/30; B32B27/304; B32B27/306; B32B27/32; B32B38/00; B32B38/0008; C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/04; C08K5/15; C08K5/151; C08K5/1515; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; B29K; B29K2027/00; B29K2027/08; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2307/7244; B32B2307/732; B32B2307/734; B32B2307/736; B32B2310/00; B32B2310/08; B32B2310/0875; B32B2310/0887; B32B2327/00; B32B2327/06; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/08; C08L2203/00; C08L2203/16; C08L2205/00; C08L2205/06; C08L23/00; C08L23/26; C08L23/28; C08L23/30; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31928
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
35 words
An extrudable vinylidene chloride copolymer composition comprising: (a) 0.01% to 6% by weight of processing aid, and (b) low weight-average molecular weight vinylidene chloride copolymer wherein the major portion of the copolymer is vinylidene chloride.
Claim 2
Dependent Claim
35 words
An extrudable vinylidene chloride copolymer composition comprising: (a) 0.01% to 6% by weight of processing aid, and (b) low weight-average molecular weight vinylidene chloride copolymer wherein the major portion of the copolymer is vinylidene chloride.
Claim 3
Dependent Claim
14 words
A composition according to claim 1 wherein the processing aid possesses an epoxy functionality.
Claim 4
Dependent Claim
52 words
A composition according to claim 1 wherein the processing aid is selected from epichlorohydrin/bisphenol A epoxy resin, epoxidized linseed oil, epoxidized soybean oil, epoxidized octyl tallate, epoxidized glycol dioleate, butyl ester of epoxidized linseed oil fatty acid, oxidized polyethylene, antioxidant, 2-ethyl hexyl diphenyl phosphate, tetrasodium pyrophosphate, chlorinated polyethylene or a mixture thereof.
Claim 5
Dependent Claim
24 words
A composition according to claim 1, 2 or 3 wherein the weight-average molecular weight of the vinylidene chloride copolymer is about 100,000 or less.
Claim 6
Dependent Claim
23 words
A composition according to any one of the preceding claims wherein the molecular weight of the processing aid is about 700 or less.
Claim 7
Dependent Claim
40 words
A multilayer, extruded, polymeric film comprising: (a) first and second polymeric film layers; and (b) a barrier layer disposed between said first and second layers, said barrier layer comprising a composition according to any one of claims 1 to 5.
Claim 8
Dependent Claim
22 words
A film according to claim 6 which has been irradiated by electron beam with a dosage of 0.5 MR to 6 MR.
Claim 9
Dependent Claim
17 words
A film according to claim 6 or 7 wherein said first and second layers comprise polyolefin materials.
Claim 10
Dependent Claim
43 words
A film according to claim 8 wherein said polyolefin materials are sleected from ethylene/vinyl acetate copolymer, high density polyethylene, low density polyethylene, linear low density polyethylene, linear very low density polyethylene, ethylene/butyl acrylate copolymer, ethylene/propylene copolymer, high density polyethylene or a mixture thereof.
Claim 11
Dependent Claim
25 words
A film according to any one of claims 6 to 9 wherein the barrier layer is not greater than about 7.37 micron (0.29 mil) thick.
Claim 12
Independent Claim
42 words
A method of improving the heat stability of vinylidene chloride copolymer during tubular extrusion with a hot blow bubble, which method comprises extruding a film with a layer of vinylidene chloride copolymer composition according to any one of claims 1 to 5.
Claim 13
Dependent Claim
44 words
A flexible polymeric film of vinylidene chloride copolymer wherein the major portion of the copolymer is vinylidene chloride, said vinylidene chloride copolymer containing a processing aid, characterised in that the vinylidene chloride copolymer is of a weight-average molecular weight of about 100,000 or less.
Claim 14
Dependent Claim
44 words
A flexible polymeric film of vinylidene chloride copolymer wherein the major portion of the copolymer is vinylidene chloride, said vinylidene chloride copolymer containing a processing aid, characterised in that the vinylidene chloride copolymer is of a weight-average molecular weight of about 100,000 or less.
Claim 15
Dependent Claim
79 words
A method of improving the heat stability of vinylidene chloride copolymer during tubular extrusion with a hot blown bubble followed by biaxial stretch orientation, characterised by extruding a film with a layer of vinylidene chloride copolymer blend comprising a composition according to claim 1 wherein the vinylidene chloride copolymer has a weight-average molecular weight of about 100,000 or less and the vinylidene chloride copolymer blend layer has a thickness after orientation of less than about 7.37 microns (0.29 mils).
Claim 16
Dependent Claim
115 words
A multi-layer biaxially stretched heat-shrinkable film comprising a first layer of ethylene vinyl acetate copolymer having a melt index greater than about 1.2 decigram/minute, and disposed therebetween a core layer of vinylidene chloride copolymer, said vinylidene chloride copolymer layer being on each surface in direct surface-to-surface contact with each of said first and second ethylene vinyl acetate copolymer layers, wherein: the major portion of the vinylidene choride copolymer is vinylidene chloride; the vinylidene copolymer layer contains a processing aid of molecular weight less than about 700; the vinylidene chloride copolymer is of weight-average molecular weight less than about 100,000; and the vinylidene chloride copolymer layer has a thickness less than about 7.37 microns (0.29 mils).
Claim 17
Dependent Claim
115 words
A multi-layer biaxially stretched heat-shrinkable film comprising a first layer of ethylene vinyl acetate copolymer having a melt index greater than about 1.2 decigram/minute, and disposed therebetween a core layer of vinylidene chloride copolymer, said vinylidene chloride copolymer layer being on each surface in direct surface-to-surface contact with each of said first and second ethylene vinyl acetate copolymer layers, wherein: the major portion of the vinylidene choride copolymer is vinylidene chloride; the vinylidene copolymer layer contains a processing aid of molecular weight less than about 700; the vinylidene chloride copolymer is of weight-average molecular weight less than about 100,000; and the vinylidene chloride copolymer layer has a thickness less than about 7.37 microns (0.29 mils).
Claim 18
Dependent Claim
44 words
A film according to claim 14 wherein the vinylidene chloride copolymer layer has a thickness of about 4.57 micron (0.18 mil) and the multi-layer film exhibits an oxygen transmission rate of less than about 45 cc/sq m/24 hours/atmosphere in accordance with ASTM D 3985.
References Cited (Backward Citations)
No citation records indexed.
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