US3956203A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of particulate expandable styrene polymers requiring shot minimum residence times in the mold
Assignee: BASF SE
•
Filing: 1975-07-28
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Granted: 1976-05-11
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Expires: 1995-07-28
Abstract
Abstract Particulate expandable styrene polymers requiring short residence times in the mold are obtained by polymerizing styrene and, optionally, other copolymerizable monomers in the presence of expanding agents and from 0.001 to 0.1% by weight of a brominated oligomer or polymer of a 1,3-diene for at least part of the time at temperatures of from 110° to 140°C.
Inventors
- 👤 Heinz Burger
- 👤 Ludwig Zuern
- 👤 Karl Buchholz
- 👤 Erhard Stahnecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:23
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F279/00; C08F279/02; C08J9/16; C08J9/20; C08J2325/00; C08J2325/02; C08J2325/04; C08J2415/00; Y; Y10; Y10S; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A process for the manufacture of particulate expandable styrene polymers requiring short minimum mold residence times by polymerizing styrene or mixtures of styrene and other copolymerizable monomers in the presence of low-boiling hydrocarbon expanding agents and from 0.001 to 0.1% by weight, based on the monomers, of a brominated oligomer or polymer of a 1,3-diene having a maximum degree of polymerization of 2000 and containing more than 40% by weight of bromine at elevated temperatures, wherein the particles forming during polymerization of styrene or said mixtures in the presence of the bromine compounds are heated, in the course of their manufacture, to temperatures of from 110° to 140°C.
Claim 2
Dependent Claim
108 words
A process for the manufacture of particulate expandable styrene polymers requiring short minimum mold residence times by polymerizing styrene or mixtures of styrene and other copolymerizable monomers in the presence of low-boiling hydrocarbon expanding agents and from 0.001 to 0.1% by weight, based on the monomers, of a brominated oligomer or polymer of a 1,3-diene having a maximum degree of polymerization of 2000 and containing more than 40% by weight of bromine at elevated temperatures, wherein the particles forming during polymerization of styrene or said mixtures in the presence of the bromine compounds are heated, in the course of their manufacture, to temperatures of from 110° to 140°C.
Claim 3
Dependent Claim
30 words
A process as claimed in claim 1 wherein the polymerization is carried out at a temperature in the range of 115-135°C for at least part of the total polymerization time.
Claim 4
Dependent Claim
61 words
A process as claimed in claim 1 wherein the polymer particles contain in homogeneous distribution from 0.001 to 0.1% by weight, based on the styrene polymer, of a brominated oligomer or polymer of a 1,3-diene selected from the group consisting of butadiene, isoprene and chloroprene having a maximum degree of polymerization of 2000 and more than 40% by weight of bromine.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 wherein styrene itself is polymerized to form particulate expandable polystyrene.
Claim 6
Dependent Claim
71 words
A process as claimed in claim 1 wherein a mixture of styrene and a member from the group consisting of o-methylstyrene, acrylonitrile, methacrylonitrile, an acrylate or methacrylate of alcohols of from 1 to 8 carbon atoms, vinyl pyridine, N-vinyl carbazole, butadiene and divinylbenzene are copolymerized, the copolymer containing at least 50% by weight of polymerized units of styrene and further containing, in the case of divinylbenzene, 0.01 to 1.0% of divinylbenzene.
References Cited (Backward Citations)
US3093599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |