US4187159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for forming a crosslinked polyvinyl chloride foam and product thereof by means of radiation crosslinking
Assignee: Stauffer Chemical Co
•
Filing: 1976-07-28
•
Granted: 1980-02-05
•
Expires: 1996-07-28
Abstract
Abstract Crosslinked polyvinyl chloride foams are formed by first expanding a polyvinyl chloride containing plastisol comprising a blowing agent, and a reactive crosslinking plasticizer to form a foamed composition and then subjecting the foamed composition to irradiation to crosslink the foamed composition via the crosslinking plasticizer.
Inventors
- 👤 Jagadish C. Goswami
- 👤 Arthur J. Yu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08F; C08F259/00; C08F259/02; C08F259/04; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S521/00; Y10S521/915; Y10S522/00; Y10S522/911
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
82 words
A process for forming a crosslinked polyvinyl chloride foam which comprises: (a) expanding a plastisol composition which consists essentially of polyvinyl chloride, a blowing agent, and a reactive plasticizer which contains at least two ethylenically unsaturated bonds, to form a foamed composition; and (b) exposing said foamed composition to radiation of from 50,000 to 20,000,000 electron volts until a dosage of from about 0.5 to about 3 megarads is applied to crosslink the foamed composition and form a dimensionally stable foamed product.
Claim 2
Dependent Claim
82 words
A process for forming a crosslinked polyvinyl chloride foam which comprises: (a) expanding a plastisol composition which consists essentially of polyvinyl chloride, a blowing agent, and a reactive plasticizer which contains at least two ethylenically unsaturated bonds, to form a foamed composition; and (b) exposing said foamed composition to radiation of from 50,000 to 20,000,000 electron volts until a dosage of from about 0.5 to about 3 megarads is applied to crosslink the foamed composition and form a dimensionally stable foamed product.
Claim 3
Dependent Claim
21 words
A process as claimed in claim 1 wherein the polyvinyl chloride comprises about 40% to 75% by weight of the plastisol.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1 wherein the blowing agent comprises about 1% to 15% by weight of the plastisol.
Claim 5
Dependent Claim
13 words
A process as claimed in claim 1 wherein the blowing agent is azodicarbonamide.
Claim 6
Dependent Claim
22 words
A process as claimed in claim 1 wherein the reactive plasticizer comprises about 5% to about 50% by weight of the plastisol.
Claim 7
Dependent Claim
14 words
A process as claimed in claim 1 wherein the reactive plasticizer is diallyl phthalate.
Claim 8
Dependent Claim
14 words
A process as claimed in claim 1 wherein the reactive plasticizer is trimethylolpropane trimethacrylate.
Claim 9
Dependent Claim
20 words
A process as claimed in claim 1 wherein the plastisol is expanded at about 185° C. to about 225° C.
Claim 10
Dependent Claim
22 words
A process as claimed in claim 1 wherein the foamed composition is irradiated with an electron beam to crosslink the foamed composition.
Claim 11
Dependent Claim
9 words
A product formed by the process of claim 1.
References Cited (Backward Citations)
US3359193A
Cited
US2952593A
Cited
GB1219803A
Cited
US3539488A
Cited
US3542661A
Cited
US3709806A
Cited
US3816284A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-04 | 1983-08-06 | 1984-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-04 | 1987-08-06 | 1988-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-04 | 1991-08-06 | 1992-02-05 | $7700.00 | Window Closed / Lapsed |