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US4038245A
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Char-forming polymer compositions
Assignee: Dow Chemical Co
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Filing: 1976-05-21
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Granted: 1977-07-26
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Expires: 1996-05-21
Abstract
Abstract Esters of the formula: ##STR1## wherein R is an n-valent tertiary hydrocarbyl radical or an inertly substituted n-valent tertiary hydrocarbyl radical, promote char formation in polymer compositions containing a monovinylidene aromatic monomer, such as styrene, and an ethylenically unsaturated carboxylic anhydride, such as maleic anhydride.
Inventors
- 👤 Charles E. Reineke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:58
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/63; C07C309/64; C07C309/65; C08; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
100 words
A char-forming composition of matter comprising, (A) a polymeric component that comprises (1) polymerized ethylenically unsaturated carboxylic anhydride in an amount sufficient to provide at least about 1 milliequivalent of anhydride moiety per gram of the char-forming composition, and (2) polymerized monovinylidene aromatic monomer in an amount sufficient to provide at least about 1 milliequivalent of reactive aromatic moiety per gram of the char-forming composition, and (B) a char-forming amount of a stable ester of the formula: ##STR12## wherein n is a positive integer and R is an n-valent tertiary hydrocarbyl radical or an inertly substituted n-valent tertiary hydrocarbyl radical.
Claim 2
Dependent Claim
100 words
A char-forming composition of matter comprising, (A) a polymeric component that comprises (1) polymerized ethylenically unsaturated carboxylic anhydride in an amount sufficient to provide at least about 1 milliequivalent of anhydride moiety per gram of the char-forming composition, and (2) polymerized monovinylidene aromatic monomer in an amount sufficient to provide at least about 1 milliequivalent of reactive aromatic moiety per gram of the char-forming composition, and (B) a char-forming amount of a stable ester of the formula: ##STR12## wherein n is a positive integer and R is an n-valent tertiary hydrocarbyl radical or an inertly substituted n-valent tertiary hydrocarbyl radical.
Claim 3
Dependent Claim
17 words
A composition of claim 1 wherein the ethylenically unsaturated carboxylic anhydride is an α,β-ethylenically unsaturated carboxylic anhydride.
Claim 4
Dependent Claim
19 words
A composition of claim 1 wherein the ethylenically unsaturated carboxylic anhydride is chloromaleic anhydride, bromomaleic anhydride or maleic anhydride.
Claim 5
Dependent Claim
73 words
A composition of claim 1 wherein the monovinylidene aromatic monomer is a compound of the formula: ##STR13## wherein R" is hydrogen or lower alkyl having from 1 to about 4 carbon atoms and R''' is hydrogen, bromine, chlorine, an alkyl radical of from 1 to about 6 carbon atoms or a haloalkyl radical of from 1 to about 6 carbon atoms which contains from 1 to about 3 atoms of bromine or chlorine.
Claim 6
Dependent Claim
23 words
A composition of claim 1 wherein the polymeric component comprises a copolymer containing the ethylenically unsaturated carboxylic anhydride and the monovinylidene aromatic monomer.
Claim 7
Dependent Claim
53 words
A composition of claim 1 wherein the stable ester has the formula: ##STR14## wherein m is 1 or 2 and each R' group is independently bromine or an inertly substituted aliphatic, alicyclic or aromatic halohydrocarbon radical containing from 1 to about 6 carbon atoms and from 1 to about 4 atoms of bromine.
Claim 8
Dependent Claim
33 words
A composition of claim 1 wherein the ester is present in an amount sufficient to provide from about 0.1 to about 1 milliequivalent of triflate ester moiety per gram of the char-forming composition.
Claim 9
Dependent Claim
21 words
A composition of claim 5 wherein the ethylenically unsaturated carboxylic anhydride is maleic anhydride and the monovinylidene aromatic monomer is styrene.
Claim 10
Dependent Claim
53 words
A composition of claim 8 wherein the stable ester has the formula: ##STR15## wherein m is 1 or 2 and each R' group is independently bromine or an inertly substituted aliphatic, alicyclic or aromatic halohydrocarbon radical containing from 1 to about 6 carbon atoms and from 1 to about 4 atoms of bromine.
Claim 11
Dependent Claim
56 words
A composition of claim 9 wherein (A) the copolymer (1) contains about 25 mole percent maleic anhydride and about 75 mole percent styrene and (2) constitutes from about 85 to about 95 weight percent of the char-forming composition, and (B) the stable ester constitutes from about 5 to about 15 weight percent of the char-forming composition.
References Cited (Backward Citations)
US3346612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |