US3975327A
Expired / Lapsed
US
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Particulate, expandable self-extinguishing styrene polymers showing good processability
Assignee: BASF SE
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Filing: 1974-03-18
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Granted: 1976-08-17
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Expires: 1994-03-18
Abstract
Abstract Particulate, expandable styrene polymers containing a flame-proofing organic halo compound as expanding agent and also a mixture of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of said mixture serving as expanding agent, show good processability and exhibit self-extinguishing properties even during processing.
Inventors
- 👤 Eckhard Nintz
- 👤 Rupert Schick
- 👤 Heinrich Horacek
- 👤 Erhard Stahnecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; C08J9/0004; C08J9/04; C08J9/12; C08J9/14; C08J9/141; C08J9/149; C08K; C08K5/00; C08K5/02; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
112 words
Expandable, self-extinguishing particles of polymers containing at least 50% by weight of polymerized units of styrene, said particles containing from 0.2 to 3% by weight of a flame-proofing compound selected from the group consisting of tetra-bromobutane, dibromoethylbenzene, pentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000, said particles further containing from 3 to 15% by weight of an expanding agent of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of the expanding agent.
Claim 2
Dependent Claim
112 words
Expandable, self-extinguishing particles of polymers containing at least 50% by weight of polymerized units of styrene, said particles containing from 0.2 to 3% by weight of a flame-proofing compound selected from the group consisting of tetra-bromobutane, dibromoethylbenzene, pentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000, said particles further containing from 3 to 15% by weight of an expanding agent of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of the expanding agent.
Claim 3
Dependent Claim
24 words
Expandable particles as set forth in claim 1, wherein said flameproofing compound is selected from the group consisting of 1,2,5,6-tetrabromocyclooctane, 1,2,5,6,9,10-hexabromocyclododecane and brominated polybutadiene.
Claim 4
Dependent Claim
37 words
Expandable particles as set forth in claim 1, wherein from 0.4 to 1% by weight of flameproofing compound is incorporated in said particles, and wherein the amount of expanding agent is from 5 to 12% by weight.
Claim 5
Dependent Claim
32 words
Expandable particles as set forth in claim 3, wherein said expanding agent is made up from 5 to 25% by weight of hydrocarbon and from 95 to 75% by weight of monofluorotrichloromethane.
Claim 6
Dependent Claim
26 words
Particulate, expandable, self-extinguishing styrene polymers as set forth in claim 1, wherein the expanding agent mixture contains, as C 3-6 hydrocarbon, isobutane and n-pentane and/or isopentane.
Claim 7
Dependent Claim
23 words
Particulate, expandable, self-extinguishing styrene polymers as set forth in claim 1, wherein the expanding agent mixture consists of n-pentane and/or isopentane and monofluorotrichloromethane.
Claim 8
Dependent Claim
94 words
A process for the manufacture of particulate, expandable, self-extinguishing styrene polymers which comprises mixing an expanding agent of from 2.5 to 30% by weight of monofluorotrichloromethane, based on the total weight of the mixture into a styrene polymer containing a flameproofing organic halo compound selected from the group consisting of tetrabromobutane, dibromoethylbenzene, sentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000, said mixing of said expanding agent into said styrene polymer taking place during or after polymerization.
Claim 9
Dependent Claim
94 words
A process for the manufacture of particulate, expandable, self-extinguishing styrene polymers which comprises mixing an expanding agent of from 2.5 to 30% by weight of monofluorotrichloromethane, based on the total weight of the mixture into a styrene polymer containing a flameproofing organic halo compound selected from the group consisting of tetrabromobutane, dibromoethylbenzene, sentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000, said mixing of said expanding agent into said styrene polymer taking place during or after polymerization.
Claim 10
Dependent Claim
103 words
A process for the manufacture of particulate, expandable, self-extinguishing styrene polymers, wherein the styrene polymers containing a flameproofing organic halo compound selected from the group consisting of tetrabromobutane, dibromoethylbenzene, pentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000 are melted and are extruded in the presence of an expanding agent mixture consisting of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of expanding agent.
Claim 11
Dependent Claim
103 words
A process for the manufacture of particulate, expandable, self-extinguishing styrene polymers, wherein the styrene polymers containing a flameproofing organic halo compound selected from the group consisting of tetrabromobutane, dibromoethylbenzene, pentabromomonochlorocyclohexane, brominated organic monomers and brominated organic phosphates, and brominated oligomers of butadiene and of isoprene, having a degree of polymerization of from 2 to 2,000 are melted and are extruded in the presence of an expanding agent mixture consisting of from 2.5 to 30% by weight of a hydrocarbon of from 3 to 6 carbon atoms and from 97.5 to 70% by weight of monofluorotrichloromethane, based on the total weight of expanding agent.
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) | 1979-08-17 | 1980-02-16 | 1980-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-17 | 1984-02-16 | 1984-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-17 | 1988-02-16 | 1988-08-17 | $7700.00 | Window Closed / Lapsed |