Patent US5531671A successfully refreshed from Google Patents.
US4239799A
Expired / Lapsed
US
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Blends of butyl rubber and polymers of vinylidene chloride
Assignee: WR Grace and Co Conn
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Filing: 1977-12-09
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Granted: 1980-12-16
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Expires: 1997-12-09
Abstract
Abstract Saran blended with butyl rubber exhibits a good balance of melt extrudability and oxygen barrier properties.
Inventors
- 👤 Alan S. Weinberg
- 👤 Mario Gillio-Tos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:07
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/06; B32B27/08; B32B27/30; B32B27/304; B32B27/306; C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/521; C08K5/523; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/08; B32B2270/00; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08L23/22; C08L63/00; Y; Y10; Y10T; Y10T428/00; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192; Y10T428/31924; Y10T428/31928
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
135 words
A film of packaging material formed from a composition of matter consisting essentially of a mixture of (a) 85 to 99 parts by weight of a vinylidene chloride interpolymer having from about 51 to about 95 parts by weight vinylidene chloride, thermally plasticized by (b) 1 to 15 parts by weight of butyl rubber, based on 100 parts of composition weight said composition having a substantially unimpaired oxygen permeability as compared to the oxygen permeability of said interpolymer without said butyl rubber, and (c) an epoxy compound in an amount from about 1 to 5 parts by weight and 2-ethyl hexyldiphenyl phosphate in an amount up to about 10 parts by weight, said vinylidene chloride interpolymer being present in an amount such that the total amount of the recited components is 100 parts by weight.
Claim 2
Dependent Claim
135 words
A film of packaging material formed from a composition of matter consisting essentially of a mixture of (a) 85 to 99 parts by weight of a vinylidene chloride interpolymer having from about 51 to about 95 parts by weight vinylidene chloride, thermally plasticized by (b) 1 to 15 parts by weight of butyl rubber, based on 100 parts of composition weight said composition having a substantially unimpaired oxygen permeability as compared to the oxygen permeability of said interpolymer without said butyl rubber, and (c) an epoxy compound in an amount from about 1 to 5 parts by weight and 2-ethyl hexyldiphenyl phosphate in an amount up to about 10 parts by weight, said vinylidene chloride interpolymer being present in an amount such that the total amount of the recited components is 100 parts by weight.
Claim 3
Dependent Claim
42 words
The film of claim 1 wherein the vinylidene chloride interpolymer includes vinylidene chloride units in an amount from about 60 to about 80 parts by weight and vinyl chloride units in an amount from about 40 to about 20 parts by weight.
Claim 4
Dependent Claim
77 words
The film of claim 1 which has an absolute Brabender torque at 16 minutes at 300° F. of about 2,000 to about 2,500 m/gm, and a Brabender time to blackening at 300° F. of from about 18 to about 30 minutes and when formed into a film having a thickness of about 0.3 mil to about 0.4 mil is characterized by an oxygen permeability of from about 20 to about 70 cc. of oxygen at 73° F.
Claim 5
Dependent Claim
10 words
An oriented film made from the composition of claim 1.
Claim 6
Dependent Claim
34 words
The film of claim 1 wherein the thickness of the film is from about 1 to about 2 mils and the oxygen permeability is from about 25 to about 60 cc. at 73° F.
Claim 7
Dependent Claim
36 words
The film of claim 1 wherein the film has a thickness of from about 0.3 to 0.4 mil and the film has an oxygen permeability of from about 20 to about 70 cc. at 73° F.
Claim 8
Dependent Claim
59 words
The film of claim 1 wherein the butyl rubber is a butyl polymer comprising isobutylene in an amount from about 85 to about 99.8 parts by weight and a diolefin having 4 or 5 carbon atoms per molecule in an amount from about 15 to about 0.2 parts by weight per 100 parts by weight of said butyl polymer.
Claim 9
Dependent Claim
10 words
The film of claim 7 wherein the diolefin is isoprene.
Claim 10
Dependent Claim
50 words
The film of claim 7 wherein said butyl polymer comprises units of isobutylene in an amount from about 90 to about 99.5 parts by weight and units of isoprene in an amount from about 10 to about 0.5 parts by weight per 100 parts by weight of said butyl polymer.
Claim 11
Dependent Claim
40 words
A multiply film including a core layer and first and second layers on opposite sides of the core layer, said core layer being the film of claim 1 and the first and second layers comprising olefinic homopolymer or interpolymer compositions.
Claim 12
Dependent Claim
35 words
The multiply film of claim 10 wherin the core layer is from about 0.3 to about 0.4 mil in thickness, and the multiply film has an oxygen permeability from about 20 to about 70 cc.
Claim 13
Dependent Claim
41 words
The multiply film of claim 11 wherein the first layer comprises an ethylene-vinyl acetate interpolymer film including from about 5 to 20 percent by weight vinyl acetate units and is irradiated and the second outer ply is of ethylene-vinyl acetate interpolymer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |