US4544698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymer coating composition and its use in the manufacture of layered packaging
Assignee: Rhone Poulenc Industries SA
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Filing: 1981-04-09
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Granted: 1985-10-01
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Expires: 2001-04-09
Abstract
Abstract The invention pertains to the field of packaging and to a coating composition composed of a polyvinyl alcohol solution and a polymer latex for imparting gas and flavor tight packaging.
Inventors
- 👤 Gilbert Roullet
- 👤 Pierre Legrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:19
CPC Classifications
C; C09; C09D; C09D129/00; C09D129/02; C09D129/04; C09D157/00; C08; C08L; C08L29/00; C08L29/02; C08L29/04; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1352; Y10T428/1379; Y10T428/31504; Y10T428/31507; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31917; Y10T428/3192; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
132 words
A composition which, upon drying, provides a moisture resistant, gas and flavor tight coating for use in a packaging material, said composition consisting essentially of an aqueous solution of polyvinyl alcohol containing more than 90% (--CH 2 OH) groups, a viscosity of less than 20 cp (in solution at 4% water) and an ester index between 2 and 150, and a latex of a water insensitive polymer incompatible with the polyvinyl alcohol selected from the group consisting of vinylidene chloride polymer latexes, the ratio of polyvinyl alcohol to latex polymer expressed by weight of dry material being between 0.4 and 3, said compositions being characterized by inversion to a two-phase coating upon drying in which the water insensitive latex polymer forms a continuous phase and the polyvinyl alcohol forms a discontinuous phase.
Claim 2
Dependent Claim
132 words
A composition which, upon drying, provides a moisture resistant, gas and flavor tight coating for use in a packaging material, said composition consisting essentially of an aqueous solution of polyvinyl alcohol containing more than 90% (--CH 2 OH) groups, a viscosity of less than 20 cp (in solution at 4% water) and an ester index between 2 and 150, and a latex of a water insensitive polymer incompatible with the polyvinyl alcohol selected from the group consisting of vinylidene chloride polymer latexes, the ratio of polyvinyl alcohol to latex polymer expressed by weight of dry material being between 0.4 and 3, said compositions being characterized by inversion to a two-phase coating upon drying in which the water insensitive latex polymer forms a continuous phase and the polyvinyl alcohol forms a discontinuous phase.
Claim 3
Dependent Claim
20 words
Composition as claimed in claim 1, in which the viscosity of the polyvinyl alcohol is between 2 and 10 cp.
Claim 4
Dependent Claim
19 words
Composition as claimed in claim 1, in which the ester index of the polyvinyl alcohol is less than 20.
Claim 5
Dependent Claim
17 words
Composition as claimed in claim 1, in which a latex mixture of water insensitive polymers is used.
Claim 6
Dependent Claim
24 words
Composition as claimed in claim 1, in which the polyvinyl alcohol/vinylidene chloride copolymer ratio by weight of dry material is between 0.6 and 1.4.
Claim 7
Dependent Claim
47 words
Process of preparing a coating composition as claimed in claim 1 comprising mixing an aqueous solution of polyvinyl alcohol of between 5 and 20% by weight with one or more water insensitive polymer latexes, the dry material content of which is between 40 and 60% by weight.
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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |