Patent US4735290A successfully refreshed from Google Patents.
US4039488A
Expired / Lapsed
US
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Foamable vinyl-chloride polymers and hard foam structures made thereof
Assignee: Stamicarbon BV
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Filing: 1976-07-28
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Granted: 1977-08-02
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Expires: 1996-07-28
Abstract
Abstract Improved foamable polymer compositions of polyvinyl chloride or copolymers containing vinyl chloride, with little or no plasticizer, are described. The foamable polymer compositions contain polyvinyl chloride, or a vinylchloride-copolymer, a chemical blowing agent, and a high molecular weight polyethylene. The compositions may also contain stabilizers, lubricants, additives to improve impact strength, etc. Rigid low density foam products are made from these compositions.
Inventors
- 👤 Johannes M.A.A. VANDERMark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:16
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2423/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A foamable vinyl chloride polymer composition, comprising: poly vinyl chloride or a vinyl chloride copolymer containing up to 30% by weight of at least one comonomer and at least 70% by weight of vinyl chloride, from 0.1 to 2% by weight of a chemical blowing agent, from 0 to 5% by weight of a plasticizer, and from 0.5 to 8% by weight of a high molecular weight polyethylene having a melt index of at most 0.1 as defined in ASTM-D 1238, all percentages being calculated on the quantity of vinyl chloride polymer.
Claim 2
Dependent Claim
92 words
A foamable vinyl chloride polymer composition, comprising: poly vinyl chloride or a vinyl chloride copolymer containing up to 30% by weight of at least one comonomer and at least 70% by weight of vinyl chloride, from 0.1 to 2% by weight of a chemical blowing agent, from 0 to 5% by weight of a plasticizer, and from 0.5 to 8% by weight of a high molecular weight polyethylene having a melt index of at most 0.1 as defined in ASTM-D 1238, all percentages being calculated on the quantity of vinyl chloride polymer.
Claim 3
Dependent Claim
23 words
The foamable vinyl chloride polymer composition of claim 1 wherein the vinyl chloride polymer contains at least 90% by weight of vinyl chloride.
Claim 4
Dependent Claim
26 words
The foamable vinyl chloride polymer composition of claim 1 wherein said high molecular weight polyethylene is present in an amount from 0.5 to 5% by weight.
Claim 5
Dependent Claim
26 words
The foamable vinyl chloride polymer composition of claim 1 wherein said high molecular weight polyethylene is present in an amount from 1.5 to 2.5% by weight.
Claim 6
Dependent Claim
37 words
A process of preparing a hard poly vinyl chloride foam product, comprising: mixing a foamable vinyl chloride polymer composition as defined in claim 1, forming and foaming said foamable polyvinyl chloride composition, into a hard foam product.
Claim 7
Dependent Claim
28 words
A process of preparing a hard polyvinyl chloride foam product as set forth in claim 5 wherein said hard foam product is formed by extruding said foamable composition.
Claim 8
Dependent Claim
13 words
A hard polyvinyl chloride foam product prepared by the process of claim 5.
Claim 9
Dependent Claim
81 words
A hard polyvinyl chloride foam shaped article having a density from about 0.4 to about 1 gm/cm 3 , comprising: a vinyl chloride polymer or copolymer containing up to 30% by weight of at least one comonomer and at least 70% by weight of vinyl chloride from 0 to 5% by weight of a plasticizer, and from 0.5 to 8% by weight of a high molecular weight polyethylene having a melt index of at most 0.1 as defined in ASTM-D 1238.
Claim 10
Dependent Claim
81 words
A hard polyvinyl chloride foam shaped article having a density from about 0.4 to about 1 gm/cm 3 , comprising: a vinyl chloride polymer or copolymer containing up to 30% by weight of at least one comonomer and at least 70% by weight of vinyl chloride from 0 to 5% by weight of a plasticizer, and from 0.5 to 8% by weight of a high molecular weight polyethylene having a melt index of at most 0.1 as defined in ASTM-D 1238.
Claim 11
Dependent Claim
40 words
A hard polyvinyl chloride foam shaped article having a density from about 0.4 to about 1 gm/cm 3 as defined in claim 8 wherein said high molecular weight polyethylene is present in an amount from 1.5 to 2.5% by weight.
Claim 12
Dependent Claim
40 words
A hard polyvinyl chloride foam shaped article having a density from about 0.4 to about 1 gm/cm 3 as defined in claim 8 wherein said high molecular weight polyethylene is present in an amount from 1.5 to 2.5% by weight.
References Cited (Backward Citations)
US3211677A
Cited
US3442837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |