US3708441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making pvc foams
Assignee: Dow Silicones Corp
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Filing: 1970-10-19
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Granted: 1973-01-02
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Expires: 1990-10-19
Abstract
Abstract An improved process for making plastisol foams is disclosed, the improvement comprising adding to the plastisol composition, prior to foaming, a material which is compatible with the plastisol and which cures at about room temperature, then foaming the resulting mixture, then curing the material added at about room temperature, and finally fusing the plastisol foam. Optionally, the foam can be shaped before or after the material is cured, but prior to fusing the plastisol composition. A separable aspect of the invention is the application of a vacuum after the composition has been foamed and prior to curing of the material, and optionally releasing the vacuum after the material has cured but prior to fusing the plastisol foam whereby a low density foam is obtained.
Inventors
- 👤 W Joslyn
- 👤 J Keil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:38
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08K; C08K5/00; C08K5/04; C08K5/10; C08K5/11; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/04; C08L33/06; C08L63/00; C08L67/00; C08L67/06; C08L75/00; C08L75/04; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S524/00; Y10S524/923
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
18 words
A process as defined in claim 1, wherein a plastisol foam stabilizer is employed in the plastisol composition.
Claim 2
Dependent Claim
19 words
A process as defined in claim 1 wherein the material added to the plastisol composition is a methacrylate monomer.
Claim 3
Dependent Claim
14 words
A process as defined in claim 3, wherein the methacrylate monomer is trimethylolpropane trimethacrylate.
Claim 4
Dependent Claim
14 words
A process as defined in claim 3, wherein the methacrylate monomer is 1,3-butylene dimethacrylate.
Claim 5
Dependent Claim
19 words
A process as defined in claim 2 wherein the material added to the plastisol composition in a methacrylate monomer.
Claim 6
Dependent Claim
14 words
A process as defined in claim 6, wherein the methacrylate monomer is trimethylolpropane trimethacrylate.
Claim 7
Dependent Claim
14 words
A process as defined in claim 6, wherein the methacrylate monomer is 1,3-butylene dimethacrylate.
Claim 8
Dependent Claim
23 words
A process as defined in claim 1, which includes the step of shaping the foam after it is formed but prior to fusing.
Claim 9
Dependent Claim
20 words
a process as defined in claim 9 wherein the foam is shaped into articles having thicknesses greater than 1 inch.
Claim 10
Dependent Claim
23 words
A process as defined in claim 2, which includes the step of shaping the foam after it is formed but prior to fusing.
Claim 11
Dependent Claim
20 words
a process as defined in claim 11, wherein the foam is shaped into articles having thicknesses greater than one inch.
Claim 12
Dependent Claim
48 words
A process as defined in claim 1, which includes the step of applying a vacuum to the foam after it has been formed but prior to the curing of the material, whereby a plastisol foam having a density of less than 20 pounds per cubic foot is obtained.
Claim 13
Dependent Claim
48 words
A process as defined in claim 2, which includes the step of applying a vacuum to the foam after it has been formed but prior to the curing of the material, whereby a plastisol foam having a density of less than 20 pounds per cubic foot is obtained.
Claim 14
Dependent Claim
48 words
A process as defined in claim 9, which includes the step of applying a vacuum to the foam after it has been formed but prior to the curing of the material, whereby a plastisol foam having a density of less than 20 pounds per cubic foot is obtained.
Claim 15
Dependent Claim
48 words
A process as defined in claim 11, which includes the step of applying a vacuum to the foam after it has been formed but prior to the curing of the material, whereby a plastisol foam having a density of less than 20 pounds per cubic foot is obtained.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |