Patent US4031045A successfully refreshed from Google Patents.
US4031045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable PVC resin formulation, process for foaming, and product thereof
Assignee: Stauffer Chemical Co
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Filing: 1976-07-28
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Granted: 1977-06-21
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Expires: 1996-07-28
Abstract
Abstract A foamable polyvinyl chloride (PVC) resin formulation containing (1) a copolymer formed by emulsion polymerizing from about 70% to about 90% vinyl chloride, from about 5% to about 15% vinyl acetate and from about 5% to about 15% of a bis(hydrocarbyl)vinylphosphonate; (2) a polyester or epoxy plasticizer (or mixture thereof) and (3) 4,4'-oxybis (benzene sulfonyl hydrazide) is foamed to form a product having a smooth unblistered surface, good cell quality and medium density. The foaming can take place at a temperature of from about 320 DEG F. (160 DEG C.) to about 400 DEG F. (204 DEG C.) for a period of time of from about 6 to about 20 minutes.
Inventors
- 👤 Jagadish Chandra Goswami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:28
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; C08J2463/00; C08J2467/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
A foamable resin formulation which consists essentially of: a. a copolymer consisting essentially of from about 70% to about 90%, by weight, of vinyl chloride, from about 5% to 15%, by weight, of vinyl acetate and about 5% to 15% by weight of a bis(hydrocarbyl)vinylphosphonate of the formula ##STR2## wherein X is selected from the group consisting of hydrogen, halogen, cyano, phenyl and C 1 -C 18 alkyl and where R and R' are C 1 - C 12 alkyl groups; b. an effective amount of a plasticizer selected from the group consisting of polyester plasticizers made from the reaction of a dibasic acid and dihydric alcohol, epoxy plasticizers made by the epoxidation of vegetable oils or fatty acids, and mixtures thereof for plasticization of the copolymer; and c. an effective amount for expansion of a 4,4' -oxybis (benzene sulfonyl hydrazide) blowing agent.
Claim 2
Dependent Claim
143 words
A foamable resin formulation which consists essentially of: a. a copolymer consisting essentially of from about 70% to about 90%, by weight, of vinyl chloride, from about 5% to 15%, by weight, of vinyl acetate and about 5% to 15% by weight of a bis(hydrocarbyl)vinylphosphonate of the formula ##STR2## wherein X is selected from the group consisting of hydrogen, halogen, cyano, phenyl and C 1 -C 18 alkyl and where R and R' are C 1 - C 12 alkyl groups; b. an effective amount of a plasticizer selected from the group consisting of polyester plasticizers made from the reaction of a dibasic acid and dihydric alcohol, epoxy plasticizers made by the epoxidation of vegetable oils or fatty acids, and mixtures thereof for plasticization of the copolymer; and c. an effective amount for expansion of a 4,4' -oxybis (benzene sulfonyl hydrazide) blowing agent.
Claim 3
Dependent Claim
20 words
A formulation as claimed in claim 1 wherein R and R' is a halosubstituted C 1 -C 8 alkyl group.
Claim 4
Dependent Claim
12 words
A formulation as claimed in claim 1 wherein the vinylphosphonate is bis(beta-chloroethyl)vinylphosphonate.
Claim 5
Dependent Claim
12 words
A formulation as claimed in claim 1, wherein the vinylphosphonate is bis(beta-chloroethyl)vinylphosphonate.
Claim 6
Dependent Claim
41 words
A formulation as claimed in claim 1 wherein the copolymer comprises from about 80% to about 90%, by weight, vinyl chloride, about 5% to about 10%, by weight, vinyl acetate and about 5% to about 10%, by weight, of the vinylphosphonate.
Claim 7
Dependent Claim
22 words
A formulation as claimed in claim 1 wherein the formulation contains from about 40% to about 60% by weight of the copolymer.
Claim 8
Dependent Claim
22 words
A formulation as claimed in claim 1 wherein the formulation contains about 40% to about 55% by weight of the polymeric plasticizer.
Claim 9
Dependent Claim
22 words
A formulation as claimed in claim 1 wherein the formulation contains about 1% to about 5% by weight of the blowing agent.
References Cited (Backward Citations)
US3943085A
Cited
US3691127A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |