US4278767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-retardant monocarboxylic acid copolymers
Assignee: Lyondell Chemical Technology LP
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Filing: 1980-05-07
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Granted: 1981-07-14
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Expires: 2000-05-07
Abstract
Abstract Copolymers of monovinyl aromatic monomers and ethylenically unsaturated monocarboxylic 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 foam composition having fire-retardant properties.
Inventors
- 👤 Adolph V. DiGiulio
- 👤 Jack N. Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:05
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/125; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/2279; C08K5/00; C08K5/04; C08K5/06; C08J2325/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
142 words
A process for making fire-retardant foams consisting of dryblending a mixture of (a) a copolymer of 70 to 95 mole percent of a monovinyl aromatic monomer and 5 to 30 mole percent of an ethylenically unsaturated monocarboxylic 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
142 words
A process for making fire-retardant foams consisting of dryblending a mixture of (a) a copolymer of 70 to 95 mole percent of a monovinyl aromatic monomer and 5 to 30 mole percent of an ethylenically unsaturated monocarboxylic 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, nuclearmethylstyrenes, ethylstyrenes, isopropylstyrenes, tertbutylstyrenes, 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
24 words
The process of claim 1 wherein the ethylenically unsaturated monocarboxylic acid monomer is selected from the group consisting of acrylic acid and methacrylic acid.
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) | 1984-07-13 | 1985-01-12 | 1985-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-13 | 1989-01-12 | 1989-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-13 | 1993-01-12 | 1993-07-14 | $7700.00 | Window Closed / Lapsed |