US4166161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retarding, expandable molding compositions of styrene polymers
Assignee: Shell Internationale Research Maatschappij BV
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Filing: 1978-05-25
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Granted: 1979-08-28
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Expires: 1998-05-25
Abstract
Abstract There are described expandable molding compositions of styrene polymers containing 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or mixtures thereof as the flame-retarding agent, and showing a favorable combination of improved properties, especially high pre-foaming velocity, good welding, rapid mold-releasing and good flame-retardance.
Inventors
- 👤 Siegfried Noetzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:29
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/0014; C08J9/0019; C08K; C08K5/00; C08K5/02; C08J2325/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
Flame-resistant, expandable molding composition of styrene polymers containing 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or a mixture thereof in such a quantity that the bromine content is from 0.1 to 5, preferably from 0.5 to 1.5 weight %, calculated on the styrene polymer.
Claim 2
Dependent Claim
40 words
Flame-resistant, expandable molding composition of styrene polymers containing 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or a mixture thereof in such a quantity that the bromine content is from 0.1 to 5, preferably from 0.5 to 1.5 weight %, calculated on the styrene polymer.
Claim 3
Dependent Claim
37 words
Flame-resistant, expandable molding composition according to claim 1, which contains, in addition to the flame-retarding agent, an organic peroxide, especially such a one having a half-life period of at least 2 hours at 100° C. (in benzene).
Claim 4
Dependent Claim
53 words
A process for preparing flame resistant, expandable molding compositions of styrene polymers by polymerization of styrene, optionally together with one or several comonomers in aqueous suspension, in the presence of an organic bromine compound as flame-retarding agent, which comprises the use of 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or a mixture thereof, as organic bromine compound.
Claim 5
Dependent Claim
53 words
A process for preparing flame resistant, expandable molding compositions of styrene polymers by polymerization of styrene, optionally together with one or several comonomers in aqueous suspension, in the presence of an organic bromine compound as flame-retarding agent, which comprises the use of 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or a mixture thereof, as organic bromine compound.
Claim 6
Dependent Claim
57 words
A process for preparing flame-resistant, expandable molding compositions according to claim 3, which comprises the addition of the hexabromohexene(s), as solution in the expanding agent, to the aqueous suspension towards the end of or after the suspension polymerization and the impregnation of the polymer particles with this solution at a temperature of from 50° to 150° C.
Claim 7
Dependent Claim
23 words
The use of 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or of a mixture thereof as fire-proofing agent for preparing flame-resistant, expandable molding compositions of styrene polymers.
Claim 8
Dependent Claim
23 words
The use of 1,2,3,4,5,6-hexabromohexene-1 or 1,2,3,4,5,6-hexabromohexene-3 or of a mixture thereof as fire-proofing agent for preparing flame-resistant, expandable molding compositions of styrene polymers.
Claim 9
Dependent Claim
25 words
Molding composition as defined in claim 2, in which the organic peroxide has a half-life of at least two hours at 100° C. (in benzene).
References Cited (Backward Citations)
US3819547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-08-27 | 1983-02-26 | 1983-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-08-27 | 1987-02-26 | 1987-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-08-27 | 1991-02-26 | 1991-08-28 | $7700.00 | Window Closed / Lapsed |