Patent US4544682A successfully refreshed from Google Patents.
US4544682A
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Polymeric compositions possessing improved flammability resistance
Assignee: Dow Chemical Co
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Filing: 1984-08-24
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Granted: 1985-10-01
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Expires: 2004-08-24
Abstract
Abstract A flame retardant polymeric composition comprising a monoalkenyl aromatic polymer having polymerized therein from about 5 to about 25 mole percent of an imide having appended, to the nitrogen atom, a bromine substituted aliphatic hydrocarbon radical. The composition is formed by melt blending a copolymer of a monoalkenyl aromatic monomer and an ethylenically-unsaturated anhydride with a brominated, primary aliphatic amine.
Inventors
- 👤 John M. Corbett
- 👤 Fred W. Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:54
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/18; C08F8/30; C08F8/32; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
46 words
A polymeric composition comprising a monoalkenyl aromatic polymer having polymerized therein from about 5 to about 25 mole percent, based on total monomer polymerized therein, of an unsaturated cyclic imide having appended, to the nitrogen atom, a bromine substituted aliphatic or aromatic substituted aliphatic hydrocarbon radical.
Claim 2
Dependent Claim
46 words
A polymeric composition comprising a monoalkenyl aromatic polymer having polymerized therein from about 5 to about 25 mole percent, based on total monomer polymerized therein, of an unsaturated cyclic imide having appended, to the nitrogen atom, a bromine substituted aliphatic or aromatic substituted aliphatic hydrocarbon radical.
Claim 3
Dependent Claim
25 words
The composition of claim 1 wherein the bromine substituted aliphatic or aromatic substituted aliphatic hydrocarbon radical is a bromine substituted, aromatic substituted aliphatic hydrocarbon radical.
Claim 4
Dependent Claim
16 words
The composition of claim 1 wherein the monoalkenyl aromatic polymer has polymerized therein an ethylenically-unsaturated anhydride.
Claim 5
Dependent Claim
12 words
The composition of claim 1 wherein the monoalkenyl aromatic polymer comprises styrene.
Claim 6
Dependent Claim
10 words
The composition of claim 1 wherein the imide is maleimide.
Claim 7
Dependent Claim
19 words
The composition of claim 1 wherein the bromine substituted aliphatic or aromatic substituted aliphatic hydrocarbon radical is 2,4,5-tribromobenzyl radical.
Claim 8
Dependent Claim
71 words
The composition of matter prepared by the process comprising melt blending of a copolymer of a monoalkenyl aromatic monomer and an ethylenically-unsaturated anhydride with a brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine at a temperature below the temperature at which the copolymer significantly degrades and for a length of time sufficient to convert an effective amount of the ethylenically-unsaturated anhydride present in the copolymer to an imide.
Claim 9
Dependent Claim
71 words
The composition of matter prepared by the process comprising melt blending of a copolymer of a monoalkenyl aromatic monomer and an ethylenically-unsaturated anhydride with a brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine at a temperature below the temperature at which the copolymer significantly degrades and for a length of time sufficient to convert an effective amount of the ethylenically-unsaturated anhydride present in the copolymer to an imide.
Claim 10
Dependent Claim
12 words
The composition of claim 7 wherein the monoalkenyl aromatic monomer is styrene.
Claim 11
Dependent Claim
12 words
The composition of claim 7 wherein the ethylenically-unsaturated anhydride is maleic anhydride.
Claim 12
Dependent Claim
12 words
The composition of claim 9 wherein the monoalkenyl aromatic monomer is styrene.
Claim 13
Dependent Claim
32 words
The composition of claim 7 wherein the ethylenically-unsaturated anhydride is present in the copolymer in an amount of from about 5 to about 50 mole percent based on total monomer polymerized therein.
Claim 14
Dependent Claim
21 words
The composition of claim 7 wherein the brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine is 2,4,5-tribromobenzyl amine.
Claim 15
Dependent Claim
31 words
The composition of claim 7 wherein the effective amount of anhydride converted to imide is between about 5 and about 25 mole percent based on total monomer polymerized in the copolymer.
Claim 16
Dependent Claim
71 words
The composition of matter prepared by the process comprising reacting an ethylenically-unsaturated anhydride with an amount of a brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine for a length of time sufficient to react at least part of the ethylenically-unsaturated anhydride with the brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine to form an imide, and polymerizing the resultant imide with a monoalkenyl aromatic monomer.
Claim 17
Dependent Claim
71 words
The composition of matter prepared by the process comprising reacting an ethylenically-unsaturated anhydride with an amount of a brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine for a length of time sufficient to react at least part of the ethylenically-unsaturated anhydride with the brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine to form an imide, and polymerizing the resultant imide with a monoalkenyl aromatic monomer.
Claim 18
Dependent Claim
12 words
The composition of claim 14 wherein the monoalkenyl aromatic monomer is styrene.
Claim 19
Dependent Claim
12 words
The composition of claim 14 wherein the ethylenically-unsaturated anhydride is maleic anhydride.
Claim 20
Dependent Claim
12 words
The composition of claim 16 wherein the monoalkenyl aromatic monomer is styrene.
Claim 21
Dependent Claim
29 words
The composition of claim 14 wherein the imide is present in the polymer in an amount of from about 5 to about 25 mole percent based on total polymer.
Claim 22
Dependent Claim
31 words
The composition of claim 14 wherein an ethylenically-unsaturated anhydride is present in the composition in an amount of from about 0 to about 25 mole percent based on total composition weight.
Claim 23
Dependent Claim
21 words
The composition of claim 14 wherein the brominated primary aliphatic amine or brominated aromatic substituted aliphatic primary amine is 2,4,5-tribromobenzyl amine.
Claim 24
Dependent Claim
33 words
A foamed polymeric composition comprising styrene having maleimide polymerized therein in an amount of from about 5 to about 25 mole percent, said maleimide having appended, to the nitrogen atom, a 2,4,5-tribromobenzyl radical.
Claim 25
Dependent Claim
33 words
A foamed polymeric composition comprising styrene having maleimide polymerized therein in an amount of from about 5 to about 25 mole percent, said maleimide having appended, to the nitrogen atom, a 2,4,5-tribromobenzyl radical.
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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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |