US4272583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproofed expandable styrene polymers
Assignee: BASF SE
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Filing: 1980-07-21
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Granted: 1981-06-09
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Expires: 2000-07-21
Abstract
Abstract Particulate expandable styrene polymers which contain an organic bromine compound as the flameproofing agent and an organic compound possessing a labile C--C, O--O or N═N bond as the synergistic agent for flameproofing. The flameproofing agent is applied to the surface of the particles while the synergistic agent is homogeneously incorporated into the particles. The polymers can be converted to self-extinguishing foams.
Inventors
- 👤 Klaus Hahn
- 👤 Herbert Naarmann
- 👤 Klaus Penzien
- 👤 Heinz Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/22; C08J9/224; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A particulate expandable styrene polymer which comprises: styrene polymer particles containing from 0.01 to 2.0 parts by weight based on 100 parts by weight of the particles of an organic bromine compound as a flameproofing agent on the surface of the particles, said flameproofing agent being applied to the particles by tumbling whereby said flameproofing agent is restricted to the surface areas of the particles, said particles further containing (a) from 3 to 10 percent by weight of a liquid or gaseous organic blowing agent which does not dissolve the polymer and which boils below the softening point of the polymer and (b) from 0.01 to 1.0% by weight of an organic synergistic flame-proofing agent containing a labile C--C, O--O or N═N bond and having a decomposition half-life, measured at 100° C. in benzene, of more than 5 hours, said blowing agent and said synergistic flameproofing agent being homogeneously dispersed throughout the particles.
Claim 2
Dependent Claim
153 words
A particulate expandable styrene polymer which comprises: styrene polymer particles containing from 0.01 to 2.0 parts by weight based on 100 parts by weight of the particles of an organic bromine compound as a flameproofing agent on the surface of the particles, said flameproofing agent being applied to the particles by tumbling whereby said flameproofing agent is restricted to the surface areas of the particles, said particles further containing (a) from 3 to 10 percent by weight of a liquid or gaseous organic blowing agent which does not dissolve the polymer and which boils below the softening point of the polymer and (b) from 0.01 to 1.0% by weight of an organic synergistic flame-proofing agent containing a labile C--C, O--O or N═N bond and having a decomposition half-life, measured at 100° C. in benzene, of more than 5 hours, said blowing agent and said synergistic flameproofing agent being homogeneously dispersed throughout the particles.
Claim 3
Dependent Claim
24 words
A particulate expandable styrene polymer as claimed in claim 1, wherein the flameproofing agent is 2,5-bis(tribromomethyl)-1,3,4-thiadiazole, 1,1,2,3,4,4-hexabromobut-2-ene, pentabromophenyl allyl ether, 2,4,6-tris(tribromomethyl)-1,3,5-triazine, 1,2,5,6,9,10-hexabromocyclododecane or pentabromomonochlorocyclohexane.
Claim 4
Dependent Claim
39 words
A particulate expandable styrene polymer as claimed in claim 1, wherein the flameproofing agent is a brominated ketone which contains at least one ##STR4## group in the molecule and bears at least one phenyl substituent which is preferably substituted.
Claim 5
Dependent Claim
26 words
A particulate expandable styrene polymer as claimed in claim 1, wherein the synergistic agent is dicumyl peroxide, di-tert.-butyl peroxide,α,α'-bis-(tert.-butyl-peroxy)-diisopropylbenzene, dicumyl, an isopropylbenzene oligomer, azodiisocyclohexanonitrile or 2,2-dimethyl-(2,2-azobutane).
Claim 6
Dependent Claim
38 words
A particulate expandable styrene polymer as claimed in claim 1, wherein the particles are coated not only with the flameproofing agent but also with a stabilizer and/or an anti-tack agent and/or agents for reducing the mold dwell time.
Claim 7
Dependent Claim
22 words
A particulate expandable styrene polymer as claimed in claim 1, wherein the particles have a diameter of from 0.1 to 6 mm.
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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) | 1984-06-08 | 1984-12-08 | 1985-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-08 | 1988-12-08 | 1989-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-08 | 1992-12-08 | 1993-06-09 | $7700.00 | Window Closed / Lapsed |