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US4266037A
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Fire-retardant imide copolymers
Assignee: Lyondell Chemical Technology LP
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Filing: 1980-05-07
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Granted: 1981-05-05
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Expires: 2000-05-07
Abstract
Abstract Copolymers of monovinyl aromatic monomers and imide derivatives of ethylenically unsaturated dicarboxylic acid monomers are blended with water as a blowing agent, bromodiphenylethers as fire retardants, and metal oxides as synergist for the ethers to form a composition which can be foamed to densities of between 1 and 10 pounds per cubic foot, said composition having fire retardant properties.
Inventors
- 👤 Adolph V. DiGiulio
- 👤 Jack N. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:06
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08J9/04; C08J9/12; C08K; C08K3/00; C08K3/18; C08K3/20; C08K5/00; C08K5/04; C08K5/06; C08J2325/00; Y; Y10; Y10S; Y10S260/00; Y10S260/24; Y10S521/00; Y10S521/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
146 words
A process for making fire-retardant foams consisting of blending a mixture of (a) a copolymer of 50 to 95 mole percent of a monovinyl aromatic monomer and 5 to 50 mole percent of an imide derivative of an ethylenically unsaturated dicarboxylic acid monomer; (b) from 0.5 to 10 percent by weight of water; (c) from 10 to 20 parts per hundred parts of copolymer of an at least tri-brominated diphenylether; and (d) 4 to 8 parts per hundred parts of copolymer of a metal oxide synergist for the ether until an intimate blend is obtained; heating the blend to a temperature of between 125° and 190° C. under sufficient pressure to prevent foaming of the blend; releasing the pressure to allow the blend to expand to a foam of density between 1 and 10 pounds per cubic foot; and cooling the resultant foam to room temperature.
Claim 2
Dependent Claim
146 words
A process for making fire-retardant foams consisting of blending a mixture of (a) a copolymer of 50 to 95 mole percent of a monovinyl aromatic monomer and 5 to 50 mole percent of an imide derivative of an ethylenically unsaturated dicarboxylic acid monomer; (b) from 0.5 to 10 percent by weight of water; (c) from 10 to 20 parts per hundred parts of copolymer of an at least tri-brominated diphenylether; and (d) 4 to 8 parts per hundred parts of copolymer of a metal oxide synergist for the ether until an intimate blend is obtained; heating the blend to a temperature of between 125° and 190° C. under sufficient pressure to prevent foaming of the blend; releasing the pressure to allow the blend to expand to a foam of density between 1 and 10 pounds per cubic foot; and cooling the resultant foam to room temperature.
Claim 3
Dependent Claim
39 words
The process of claim 1 including blending into the mixture from 0.5 to 5 percent by weight of copolymer of a nucleating agent selected from the group consisting of talc, diatomaceous earth, soft wood flour and pecan shell flour.
Claim 4
Dependent Claim
39 words
The process of claim 1 wherein said water is in the form of a hydrated salt selected from the group consisting of gypsum, sodium metasilicate pentahydrate, aluminum sulfate, magnesium sulfate, calcium thiosulfate, sodium tetraborate, sodium carbonate and mixtures thereof.
Claim 5
Dependent Claim
32 words
The process of claim 1 wherein the synergist for the ether is a metal oxide selected from the group consisting of antimony trioxide, bismuth oxide, molybdenum oxide, stannic oxide and tungsten oxide.
Claim 6
Dependent Claim
32 words
The process of claim 1 wherein the monovinyl aromatic monomer of said copolymer is selected from the group consisting of styrene, alpha-methylstyrene, nuclear-methylstyrenes, ethylstyrenes, isopropylstyrenes, tert-butylstyrenes, chlorostyrenes, dichlorostyrenes, vinylnaphthalene and mixtures thereof.
Claim 7
Dependent Claim
25 words
The process of claim 1 wherein the diphenylether is selected from the group consisting of tribromodiphenylether, tetrabromodiphenylether, pentabromodiphenylether, tribromochlorodiphenylether, tribromodichlorodiphenylether, tribromotrichlorodiphenylether, tetrabromodichlorodiphenylether, octabromodiphenylether and decabromodiphenylether.
Claim 8
Dependent Claim
53 words
The process of claim 1 wherein the imide derivative consists of an imide or N-substituted imide of an ethylenically unsaturated dicarboxylic acid selected from the group consisting of maleic acid, fumaric acid, itaconic acid, citraconic acid, mesaconic acid, ethylmaleic acid, methylitaconic acid, chloromaleic acid, dichloromaleic acid, bromomaleic acid, dibromomaleic acid and mixtures thereof.
Claim 9
Dependent Claim
60 words
The process of claim 7 wherein imide derivatives are those derived by the reaction of an ethylenically unsaturated dicarboxylic acid moiety selected from the diacid, its anhydride and its half acid-ester derivative with an amine selected from the group consisting of ammonia, alkylamines having 1 to 4 carbon atoms in the alkyl group, ethanolamine, aniline, benzylamine, allylamine and mixtures thereof.
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) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |