Patent US3760047A successfully refreshed from Google Patents.
US3760047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the manufacture of polymer foams containing esters of tertiary alcohols as side groups
Assignee: BASF SE
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Filing: 1970-12-04
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Granted: 1973-09-18
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Expires: 1990-12-04
Abstract
Abstract A process for the manufacture of foams by heating polymers containing polymerized units of esters of ethylenically unsaturated polymerizable acids having three or four carbon atoms with tert-butanol at elevated temperatures wherein a pH of from 2.0 to 0.1 is set up in aqueous systems of the polymers, the water is evaporated and the residue is heated to temperatures above the decomposition temperature of the carboxylic esters.
Inventors
- 👤 R Gaeth
- 👤 B Schmitt
- 👤 D Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:39
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
66 words
A process as claimed In claim 1 wherein the polymer having a residual water content of not more than 10 percent is comminuted to form non-expanded expandable particles, particles a mold cavity is partially filled with the particles and heated to expand and fuse the particles together after the water has been evaporated to form a foamed article which is subsequently removed from the mold cavity.
Claim 2
Dependent Claim
17 words
A process as claimed in claim 1 wherein said residual water content is less than 3 percent.
Claim 3
Dependent Claim
65 words
A process as claimed in claim 1 wherein polymers are used which contain from 0.1 to 10 percent by weight of polymerized units of a copolymerizable acid, based on the monomers, said copolymerizable acid being selected from the group consisting of acrylic acid, methacrylic acid, maleic acid, vinyl sulfonic acid, styrene sulfonic acid, 3-methacryloxy-propylsulfonic acid, 3-methacryloxy-ethyl-sulfonic acid, 3-acryloxy-propylsulfonic acid, 3-acryloxy-ethyl-sulfonic acid and vinyl phosphonic acid.
Claim 4
Dependent Claim
14 words
A process as claimed in claim 4 wherein said copolymerizable acid is acrylic acid.
Claim 5
Dependent Claim
27 words
A process as claimed in claim 4 wherein polymers are used which contain polymerized units of copolymerizable acids having a dissociation constant of more than 10 4.
Claim 6
Dependent Claim
13 words
A process as claimed in claim 6 wherein said acid is vinyl sulfonic.
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |