Patent US4320175A successfully refreshed from Google Patents.
US4320175A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laminated film
Assignee: Kureha Corp
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Filing: 1980-04-21
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Granted: 1982-03-16
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Expires: 2000-04-21
Abstract
Abstract A laminated film containing at least two layers of which one layer is a gas-barriering layer comprising a copolymer of vinylidene chloride with a reduced viscosity of 0.030 to 0.050 and the other layer is a strengthening layer arranged to be adjacent to the gas-barriering layer, comprising a copolymer of vinylidene chloride with a reduced viscosity of 0.050 to 0.075.
Inventors
- 👤 Nobuyuki Hisazumi
- 👤 Shinichiro Funabashi
- 👤 Katsuhiko Sugeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:11
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/30; B32B27/304; B32B27/06; B32B27/08; B32B27/18; B32B27/22; B32B7/00; B32B7/04; B32B7/12; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/70; B32B2307/724; B32B2307/7242; B32B2439/00; B32B2439/70; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/3192
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
153 words
A laminate film comprising at least two layers, one layer being a gas-barriering layer composed of 100 parts by weight of a copolymer of vinylidene chloride of a reduced viscosity of 0.030 to 0.050 and 0.5 to 3 parts by weight of an epoxy-type stabilizer, and another layer being a strengthening layer arranged to be adjacent to said gas-barriering layer and being composed of 100 parts by weight of a copolymer of vinylidene chloride of a reduced viscosity of 0.050 to 0.075, 0.5 to 3 parts by weight of an epoxy-type stabilizer and 4 to 20 parts by weight of an organic additive of a number average molecular weight of 800 to 10,000, said organic additive being selected from the group consisting of rosin esters, hydrogenated rosin esters, oligoesters, epoxy rosin oligomers, co-oligomers of styrene with butene, isobutene, butadiene or maleic acid, oligoamides, oligomers of butadiene, oligomers of butene and oligomers of ethylene.
Claim 2
Dependent Claim
153 words
A laminate film comprising at least two layers, one layer being a gas-barriering layer composed of 100 parts by weight of a copolymer of vinylidene chloride of a reduced viscosity of 0.030 to 0.050 and 0.5 to 3 parts by weight of an epoxy-type stabilizer, and another layer being a strengthening layer arranged to be adjacent to said gas-barriering layer and being composed of 100 parts by weight of a copolymer of vinylidene chloride of a reduced viscosity of 0.050 to 0.075, 0.5 to 3 parts by weight of an epoxy-type stabilizer and 4 to 20 parts by weight of an organic additive of a number average molecular weight of 800 to 10,000, said organic additive being selected from the group consisting of rosin esters, hydrogenated rosin esters, oligoesters, epoxy rosin oligomers, co-oligomers of styrene with butene, isobutene, butadiene or maleic acid, oligoamides, oligomers of butadiene, oligomers of butene and oligomers of ethylene.
Claim 3
Dependent Claim
22 words
A laminate film according to claim 1, wherein said gas-barriering layer further contains 0 to 3 part by weight of a plasticizer.
Claim 4
Dependent Claim
22 words
A laminate film according to claim 1, wherein said strengthening layer further contains up to 20 parts by weight of MBS resin.
Claim 5
Dependent Claim
34 words
A laminate film according to claim 1, wherein said epoxy-type stabilizer is selected from the group consisting of epoxidized vegetable oils, monoesters of epoxidized fatty acids, diesters of epoxidized fatty acids and alicyclic epoxides.
Claim 6
Dependent Claim
51 words
A laminate film according to claim 1, wherein said organic additive is an oligoester formed from an aliphatic dicarboxylic acid having 8 to 12 carbon atoms and a polyvalent alcohol having 2 to 6 carbon atoms, of a number average molecular weight of 1,000 to 3,000, preferably of 1,500 to 2000.
Claim 7
Dependent Claim
22 words
A laminate film according to claim 1, wherein said strengthening layer is adhered onto one or two surfaces of said gas-barriering layer.
Claim 8
Dependent Claim
23 words
A laminate film according to claim 6, wherein the strengthening layer is adhered onto the gas-barriering layer by means of an adhesive layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-15 | 1985-09-14 | 1986-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-15 | 1989-09-14 | 1990-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-15 | 1993-09-14 | 1994-03-16 | $7700.00 | Window Closed / Lapsed |