US4286071A
Expired / Lapsed
US
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Self-extinguishing fine particulate expandable styrene polymers
Assignee: Huels AG
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Filing: 1980-01-30
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Granted: 1981-08-25
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Expires: 2000-01-30
Abstract
Abstract Self-extinguishing, fine particulate, expandable styrene polymers for the manufacture of molded articles, containing bromine compounds and one synergist. The synergist, referred to the styrene polymer, is at least one hydrocarbon present in amounts from about 0.1 to 3% by weight and forms stable radicals at temperatures above 300 DEG C.
Inventors
- 👤 Josef K. Rigler
- 👤 Hans-Josef Ratajczak
- 👤 Horst Leithauser
- 👤 Karl Trukenbrod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:01
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/16; C08J9/20; C08J9/0014; C08K; C08K5/00; C08K5/01; C08K5/02; C08K5/04; C08K5/14; C08J2325/00; C08J2325/02; C08J2325/04; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
98 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist, comprising a hydrocarbon soluble in monomeric styrene and forming stable radicals at temperatures above 300° C. in a concentration of about 0.1 to 3% by weight based on said polymerized styrene, said hydrocarbon selected from compounds having the general formula ##STR2## wherein R 1 to R 6 are hydrogen, halogen, alkyl, cycloalkyl or aryl groups.
Claim 2
Dependent Claim
98 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist, comprising a hydrocarbon soluble in monomeric styrene and forming stable radicals at temperatures above 300° C. in a concentration of about 0.1 to 3% by weight based on said polymerized styrene, said hydrocarbon selected from compounds having the general formula ##STR2## wherein R 1 to R 6 are hydrogen, halogen, alkyl, cycloalkyl or aryl groups.
Claim 3
Dependent Claim
86 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist comprising 1-phenyl-1,3,3-trimethylindane in a concentration of about 0.4 to 1% by weight based on said polymerized styrene and at least one organic peroxide comprising dicumylperoxide in a concentration of said organic peroxide from 0.04 to 0.06% by weight based on said polymerized styrene.
Claim 4
Dependent Claim
86 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist comprising 1-phenyl-1,3,3-trimethylindane in a concentration of about 0.4 to 1% by weight based on said polymerized styrene and at least one organic peroxide comprising dicumylperoxide in a concentration of said organic peroxide from 0.04 to 0.06% by weight based on said polymerized styrene.
Claim 5
Dependent Claim
86 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist comprising a hydrocarbon soluble in monomeric styrene and forming stable radicals at temperatures above 300° C. in a concentration of about 0.1 to 3% by weight based on said polymerized styrene, said hydrocarbon selected from the group consisting of dibenzyltoluol, 1-phenyl-1,3,-trimethylindane and benzyltoluol.
Claim 6
Dependent Claim
86 words
In a particulate molding composition for the production of foamed articles consisting essentially of a mixture of a polymerized styrene monomer or styrene monomer in admixture with comonomers, an expanding agent, an organic bromine compound and a synergist, the improvement comprising said synergist comprising a hydrocarbon soluble in monomeric styrene and forming stable radicals at temperatures above 300° C. in a concentration of about 0.1 to 3% by weight based on said polymerized styrene, said hydrocarbon selected from the group consisting of dibenzyltoluol, 1-phenyl-1,3,-trimethylindane and benzyltoluol.
Claim 7
Dependent Claim
36 words
The particulate molding composition of claim 3, further comprising from about 0.01 to 0.08% by weight of at least one organic peroxide having a decomposition half value time of more than two hours at 100° C.
Claim 8
Dependent Claim
32 words
The particulate molding composition of claim 4, having a concentration of said hydrocarbon from 0.4 to 1% by weight and a concentration of said organic peroxide from 0.04 to 0.06% by weight.
Claim 9
Dependent Claim
41 words
The particulate molding composition of claim 5, wherein said bromine compound has more than 40% by weight bromine and bromine of said bromine compound has a concentration of about 0.1 to 2% by weight based on the weight of said styrenes.
Claim 10
Dependent Claim
36 words
The particulate molding composition of claim 11, further comprising from about 0.01 to 0.08% by weight of at least one inorganic peroxide having a decomposition half value time of more than two hours at 100° C.
Claim 11
Dependent Claim
32 words
The particulate molding composition of claim 16, having a concentration of said hydrocarbon from 0.4 to 1% by weight and a concentration of said organic peroxide from 0.04 to 0.06% by weight.
Claim 12
Dependent Claim
41 words
The particulate molding composition of claim 7, wherein said bromine compound has more than 40% by weight bromine and bromine of said bromine compound has a concentration of about 0.1 to 2% by weight based on the weight of said styrenes.
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) | 1984-08-24 | 1985-02-23 | 1985-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-24 | 1989-02-23 | 1989-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-24 | 1993-02-23 | 1993-08-25 | $7700.00 | Window Closed / Lapsed |