Patent US4039486A successfully refreshed from Google Patents.
US4039486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable vinyl-chloride polymers and rigid foam structures made thereof
Assignee: Stamicarbon BV
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Filing: 1976-11-24
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Granted: 1977-08-02
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Expires: 1996-11-24
Abstract
Abstract Improved foamable polymer compositions of polyvinyl chloride and copolymers containing vinyl chloride, with little or no plasticizer, are described. The foamable polymer compositions contain polyvinyl chloride or a copolymer containing vinyl chloride, a blowing agent, and a high density, high molecular weight polyethylene. The compositions may also contain stabilizers, lubricants, activators, and inorganic fillers or pigments. Rigid low density foam products are made from these compositions.
Inventors
- 👤 Johannes M.A.A. VAN DER Mark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2423/00; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A foamable vinyl chloride polymer composition, comprising: polyvinyl chloride or a vinyl chloride copolymer containing 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 4% by weight of a high density, high molecular weight polyethylene having a melt index more than 0.1 and less than 2.1 dg/min as defined in ASTM D-1238, all percentages being calculated on the quantity of vinyl chloride polymer.
Claim 2
Dependent Claim
86 words
A foamable vinyl chloride polymer composition, comprising: polyvinyl chloride or a vinyl chloride copolymer containing 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 4% by weight of a high density, high molecular weight polyethylene having a melt index more than 0.1 and less than 2.1 dg/min as defined in ASTM D-1238, all percentages being calculated on the quantity of vinyl chloride polymer.
Claim 3
Dependent Claim
28 words
The foamable vinyl chloride polymer composition of claim 1 wherein said high density, high molecular weight polyethylene is present in an amount from 0.5 to 2% by weight.
Claim 4
Dependent Claim
26 words
The foamable vinyl chloride polymer composition of claim 1 wherein said high density, high molecular weight polyethylene is present in an amount of 0.5% by weight.
Claim 5
Dependent Claim
37 words
A process of preparing a rigid polyvinyl chloride product, comprising: mixing a foamable vinyl chloride polymer composition as defined in claim 1, polymerizing said composition, foaming said composition, and forming said composition into a rigid foam product.
Claim 6
Dependent Claim
27 words
A process of preparing a rigid polyvinyl chloride foam product as set forth in claim 4 wherein said rigid polyvinyl chloride foam product is formed by extrusion.
Claim 7
Dependent Claim
13 words
A rigid polyvinyl chloride foam product prepared by the process of claim 4.
Claim 8
Dependent Claim
13 words
A rigid polyvinyl chloride foam product prepared by the process of claim 5.
Claim 9
Dependent Claim
25 words
The foamable vinyl chloride polymer composition of claim 1 wherein said chemical blowing agent is present in an amount from 0.1 to 1% by weight.
Claim 10
Dependent Claim
31 words
The foamable vinyl chloride polymer composition of claim 1 wherein said high density, high molecular weight polyethylene has a melt index of at least 1.0 but not more than 2.1 dg/min.
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) | 1980-08-01 | 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 |