US3661630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Weldable polyurethane foam and process for manufacture
Assignee: Rudolph Koepp & Co Chem Fab AG
•
Filing: 1969-07-10
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Granted: 1972-05-09
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Expires: 1989-07-10
Abstract
Abstract Polyurethane foam of open pore structure is sized with a vinylidene chloride polymer to improve weladability thereof.
Inventors
- 👤 Hans-Jurge Kunststofftechniker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:19
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/36; C08J9/40; C08J9/42; B; B29; B29K; B29K2027/00; B29K2027/08; B29K2427/00; B29K2427/08; C08J2375/00; C08J2375/04; C08J2427/00
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
12 words
Polyurethane foam according to claim 1, said polyurethane being a polyether polyurethane.
Claim 2
Dependent Claim
21 words
Polyurethane foam according to claim 1, said polymer of vinylidene chloride having a sealing temperature of at least about 100* C.
Claim 3
Dependent Claim
20 words
Polyurethane foam according to claim 1, said polymer of vinylidene chloride being a copolymer vinylidene chloride and a vinyl monomer.
Claim 4
Dependent Claim
14 words
Polyurethane foam according to claim 4, said vinyl monomer being an acrylic acid ester.
Claim 5
Dependent Claim
11 words
Polyurethane foam according to claim 4, said monomer being vinyl chloride.
Claim 6
Dependent Claim
27 words
Polyurethane foam according to claim 1, the amount of polymer of vinylidene chloride being about 3-30 weight percent with reference to the weight of the unsized foam.
Claim 7
Dependent Claim
18 words
Polyurethane foam according to claim 7, the polymer content of vinylidene chloride moieties being at least 80 percent.
Claim 8
Dependent Claim
18 words
Polyurethane foam according to claim 1, the polymer content of vinylidene chloride moieties being at least 80 percent.
Claim 9
Dependent Claim
27 words
Polyurethane foam according to claim 1, the amount of polymer of vinylidene chloride being about 5-20 weight percent with reference to the weight of the unsized foam.
Claim 10
Dependent Claim
18 words
Polyurethane foam according to claim 10, the polymer content of vinylidene chloride moieties being at least 80 percent.
Claim 11
Dependent Claim
81 words
Process for the manufacture of polyurethane foam sized to impart weldability thereto, which comprises: a. impregnating the foam with polymer of vinylidene chloride contained in a carrier medium, the polymer content of the vinylidene chloride moieties being at least 60 percent; b. drying the impregnated foam to expel the carrier medium and deposit the polymer in the foam; c. heating the foam and deposited polymer so that the polymer flows together and adheres to the foam as a uniform coating thereon.
Claim 12
Dependent Claim
33 words
Process for the manufacture of polyurethane foam sized to impart weldability thereto, which comprises: a. impregnating the foam with polymer of vinylidene chloride having a vinylidene chloride content of at least 60 percent;
Claim 13
Dependent Claim
17 words
Process according to claim 13, the polymer content of vinylidene chloride moieties being at least 60 percent.
Claim 14
Dependent Claim
12 words
Process according to claim 14, the polyurethane foam being a polyether polyurethane.
Claim 15
Dependent Claim
12 words
Process according to claim 13, the polyurethane foam being a polyether polyurethane.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |