US4025465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable vinyl chloride polymer compositions
Assignee: European Vinyls Corp Technology AG
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Filing: 1972-12-04
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Granted: 1977-05-24
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Expires: 1992-12-04
Abstract
Abstract Foamable vinyl chloride polymer composition containing as a foam stabilizer an alkyl acrylate polymer.
Inventors
- 👤 Clive Dorrn
- 👤 Rex William Gould
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2433/00; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
78 words
A foamable rigid vinyl chloride polymer composition having a B.S. softness of 0-10 in the unexpanded state containing as foam stabilizer at least one alkyl acrylate polymer made by polymerizing monomers consisting essentially of an alkyl acrylate and 0-25% by weight thereof of at least one comonomer selected from the group consisting of styrene, alkyl methacrylates, acrylamides and other alkyl acrylates in an amount of 0.2 to 2.5% by weight of the vinyl chloride polymer in said composition.
Claim 2
Dependent Claim
78 words
A foamable rigid vinyl chloride polymer composition having a B.S. softness of 0-10 in the unexpanded state containing as foam stabilizer at least one alkyl acrylate polymer made by polymerizing monomers consisting essentially of an alkyl acrylate and 0-25% by weight thereof of at least one comonomer selected from the group consisting of styrene, alkyl methacrylates, acrylamides and other alkyl acrylates in an amount of 0.2 to 2.5% by weight of the vinyl chloride polymer in said composition.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 in which the foam stabiliser is an n-butyl acrylate homo- or copolymer.
Claim 4
Dependent Claim
20 words
A composition according to claim 2 in which the foam stabiliser is a copolymer of n-butyl acrylate and methyl methacrylate.
Claim 5
Dependent Claim
37 words
A composition according to claim 2 in which the n-butyl acrylate homo- or co-polymer has a reduced viscosity (measured as a 0.1% by weight solution in chloroform at 25° C.) within the range 0.2 to 5 dl/g.
Claim 6
Dependent Claim
26 words
A composition according to claim 1 which contains a blowing agent of the decomposable type which decomposes on heating to yield a gas which effects foaming.
Claim 7
Independent Claim
152 words
A method of producing a foamable rigid vinyl chloride polymer composition which includes incorporating into a vinyl chloride polymer a foam stabilizer, which comprises at least one alkyl acrylate polymer made by polymerizing monomers consisting essentially of at least one alkyl acrylate with 0-25% by weight thereof of at least one comonomer selected from the group consisting of styrene, alkyl methacrylates, acrylamides and other alkyl acrylates, in an amount of 0.2 to 2.5% by weight of the vinyl chloride polymer, the foamable composition being formed in two stages, a composition containing more than 2.5% by weight of the foam stabilizer, based on the weight of the vinyl chloride polymer present, being formed in the first stage and a composition containing 0.2 to 2.5% by weight of the foam stabilizer, based on the weight of the vinyl chloride polymer present being formed in the second stage by dilution with further vinyl chloride polymer.
Claim 8
Independent Claim
152 words
A method of producing a foamable rigid vinyl chloride polymer composition which includes incorporating into a vinyl chloride polymer a foam stabilizer, which comprises at least one alkyl acrylate polymer made by polymerizing monomers consisting essentially of at least one alkyl acrylate with 0-25% by weight thereof of at least one comonomer selected from the group consisting of styrene, alkyl methacrylates, acrylamides and other alkyl acrylates, in an amount of 0.2 to 2.5% by weight of the vinyl chloride polymer, the foamable composition being formed in two stages, a composition containing more than 2.5% by weight of the foam stabilizer, based on the weight of the vinyl chloride polymer present, being formed in the first stage and a composition containing 0.2 to 2.5% by weight of the foam stabilizer, based on the weight of the vinyl chloride polymer present being formed in the second stage by dilution with further vinyl chloride polymer.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |