US3755209A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable particulate styrene polymers for the production of moldings exhibiting good dimensional stability and good fusion
Assignee: BASF SE
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Filing: 1972-01-31
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Granted: 1973-08-28
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Expires: 1992-01-31
Abstract
Abstract The invention relates to foamable particulate self-extinguishing styrene polymers which, on account of their low content of oxyalkylation product of ammonia or amine, are suitable for making foam articles exhibiting good fusion and good dimensional stability, and to a process for their production.
Inventors
- 👤 E Nintz
- 👤 E Stahnecker
- 👤 H Keppler
- 👤 L Zuern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:47
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/16; C08J9/20; C08K; C08K5/00; C08K5/02; C08K5/16; C08K5/17; C08J2325/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
98 words
A process for the manufacture or bromine compound-containing expandable styrene polymers as claimed in claim 1 by polymerizing styrene and, optionally, conventional comonomers in aqueous suspension at temperatures above 85*C using free-radical-generating initiators, wherein from 0.00001 to 1 percent by weight, based on the styrene polymer, of an oxyalkylation product of ammonia or a primary or secondary aliphatic amine with ethylene oxide, propylene oxide or higher 1, 2 epoxides and contains from 1 to 3 oxyalkylene groups, which oxyalkylation product is soluble in the organic phase of the suspension, is added to the suspension before or during polymerization.
References Cited (Backward Citations)
US3274133A
Cited
US3654220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |