Patent US4136135A successfully refreshed from Google Patents.
US4136135A
Expired / Lapsed
US
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Styrene/maleic anhydride copolymers
Assignee: Bayer Antwerpen NV
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Filing: 1977-03-03
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Granted: 1979-01-23
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Expires: 1997-03-03
Abstract
Abstract A polymer composition comprising a styrene/maleic anhydride copolymer, a halogen-containing rubber, a halogenated aromatic flame-retardant, a flame-retardant synergist and a smoke suppressant comprising a mixture of dawsonite, calcium oxide and a magnesium compound. Such polymers have reduced combustibility and evolve less smoke when burned.
Inventors
- 👤 Yoon C. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:44
CPC Classifications
C; C08; C08K; C08K13/00; C08K13/02; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/24; C08K3/26; C08K5/00; C08K5/0008; C08K5/0066; C08L; C08L25/00; C08L25/02; C08L25/04; C08L25/08; C08L35/00; C08L35/06; C08L15/00; C08L15/02; C08L23/00; C08L23/26; C08L23/28; C08L63/00; C08L63/10
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
146 words
A polymer composition with reduced combustibility which comprises: A. from 40 to 60 parts of a styrene/maleic anhydride compolymer; B. from 1 to 30 parts of a halogen-containing rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubber and chlorinated polyethylene; C. from 7.5 to 15 parts of a halogenated aromatic flame retardant additive; D. from 1 to 15 parts of a metal oxide flame retardant synergist; and E. a total of from 15 to 25 parts of a smoke suppressant combination consisting of from 2 to 10 parts each of (i) dawsonite, (ii) calcium oxide, and (iii) a magnesium compound selected from magnesium carbonate, magnesium borate and magnesium oxide, wherein the total number of parts of (ii) is at least one quarter the sum of the parts of (i), (ii) and (iii), all parts being by weight of the polymer composition.
Claim 2
Dependent Claim
146 words
A polymer composition with reduced combustibility which comprises: A. from 40 to 60 parts of a styrene/maleic anhydride compolymer; B. from 1 to 30 parts of a halogen-containing rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubber and chlorinated polyethylene; C. from 7.5 to 15 parts of a halogenated aromatic flame retardant additive; D. from 1 to 15 parts of a metal oxide flame retardant synergist; and E. a total of from 15 to 25 parts of a smoke suppressant combination consisting of from 2 to 10 parts each of (i) dawsonite, (ii) calcium oxide, and (iii) a magnesium compound selected from magnesium carbonate, magnesium borate and magnesium oxide, wherein the total number of parts of (ii) is at least one quarter the sum of the parts of (i), (ii) and (iii), all parts being by weight of the polymer composition.
Claim 3
Dependent Claim
27 words
A polymer composition according to claim 1 in which the copolymer is formed from styrene and maleic anhydride in a weight ratio of from 95:5 to 70:30.
Claim 4
Dependent Claim
20 words
A polymer composition according to claim 1 which comprises from 5 to 25 parts by weight of a halogen-containing rubber.
Claim 5
Dependent Claim
44 words
A polymer composition according to claim 1 in which the smoke suppressant combination comprises from 3 to 10 parts of dawsonite and from 3 to 6 parts each of calcium oxide and magnesium carbonate, all parts being by weight of the total polymer composition.
Claim 6
Dependent Claim
117 words
A polymer composition of reduced combustibility which comprises: A. from 40 to 60 parts of a styrene/maleic anhydride copolymer; B. from 5 to 25 parts of a halogenated rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubbers and chlorinated polyethylene; C. from 7.5 to 15 parts of a halogenated aromatic flame-retardant additive; D. from 1 to 15 parts of a metal oxide flame-retardant synergist; E. from 15 to 20 parts of a smoke suppressant combination consisting of: (i) 4 to 6 parts of dawsonite; (ii) from 4 to 6 parts of calcium oxide, and (iii) from 4 to 6 parts of magnesium carbonate, all parts being by weight of the polymer composition.
Claim 7
Dependent Claim
117 words
A polymer composition of reduced combustibility which comprises: A. from 40 to 60 parts of a styrene/maleic anhydride copolymer; B. from 5 to 25 parts of a halogenated rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubbers and chlorinated polyethylene; C. from 7.5 to 15 parts of a halogenated aromatic flame-retardant additive; D. from 1 to 15 parts of a metal oxide flame-retardant synergist; E. from 15 to 20 parts of a smoke suppressant combination consisting of: (i) 4 to 6 parts of dawsonite; (ii) from 4 to 6 parts of calcium oxide, and (iii) from 4 to 6 parts of magnesium carbonate, all parts being by weight of the polymer composition.
Claim 8
Dependent Claim
30 words
A polymer composition according to claim 5 in which the copolymer consists of styrene and maleic anhydride in proportions by weight of from 75:25 to 90:10 styrene to maleic anhydride.
Claim 9
Dependent Claim
16 words
A polymer composition according to claim 5 in which the halogenated rubber is an epichlorohydrin rubber.
Claim 10
Dependent Claim
17 words
A polymer composition according to claim 5 in which the metal oxide flame-retardant synergist is antimony trioxide.
Claim 11
Dependent Claim
37 words
A polymer composition according to claim 5 in which the smoke suppressant additive consists of from 4 to 6 parts of dawsonite, calcium oxide and magnesium carbonate, all parts being by weight of the total polymer composition.
Claim 12
Dependent Claim
103 words
A polymer composition of reduced combustibility which comprises: A. from 40 to 60 parts of a polymer of styrene and maleic anhydride in respective proportions of from 70:30 to 90:10; B. from 10 to 25 parts of an epichlorohydrin rubber; C. from 7.5 to 12 parts of a halogenated flame-retardant additive D. from 3 to 12 parts of antimony trioxide; and E. from 15 to 20 parts of a smoke suppressant combination of (i) 5 to 10 parts of dawsonite; (ii) 5 parts of calcium oxide; and (iii) 5 parts of magnesium carbonate, wherein all parts are by weight of the polymer composition.
Claim 13
Dependent Claim
103 words
A polymer composition of reduced combustibility which comprises: A. from 40 to 60 parts of a polymer of styrene and maleic anhydride in respective proportions of from 70:30 to 90:10; B. from 10 to 25 parts of an epichlorohydrin rubber; C. from 7.5 to 12 parts of a halogenated flame-retardant additive D. from 3 to 12 parts of antimony trioxide; and E. from 15 to 20 parts of a smoke suppressant combination of (i) 5 to 10 parts of dawsonite; (ii) 5 parts of calcium oxide; and (iii) 5 parts of magnesium carbonate, wherein all parts are by weight of the polymer composition.
Claim 14
Independent Claim
152 words
A method of reducing the smoke evolved by a flaming polymer composition comprising from 40 to 60 parts of a styrene/maleic anhydride copolymer, from 1 to 30 parts of a halogen-containing rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubbers and chlorinated polyethylene, from 7.5 to 15 parts of a halogenated aromatic flame-retardant additive and from 1 to 15 parts of a metal oxide flame-retardant synergist, which comprises incorporating therein a total of 15 to 25 parts by weight of the composition of a smoke suppressant combination consisting of from 2 to 10 parts each of (i) dawsonite, (ii) calcium oxide, and (iii) a magnesium compound selected from magnesium carbonate, magnesium borate and magnesium oxide, wherein the total number of parts of (ii) is at least one quarter the sum of the parts of (i), (ii) and (iii), all parts being by weight of the polymer composition.
Claim 15
Independent Claim
152 words
A method of reducing the smoke evolved by a flaming polymer composition comprising from 40 to 60 parts of a styrene/maleic anhydride copolymer, from 1 to 30 parts of a halogen-containing rubber selected from the group consisting of homopolymers and copolymers of chloroprene, epichlorohydrin rubbers and chlorinated polyethylene, from 7.5 to 15 parts of a halogenated aromatic flame-retardant additive and from 1 to 15 parts of a metal oxide flame-retardant synergist, which comprises incorporating therein a total of 15 to 25 parts by weight of the composition of a smoke suppressant combination consisting of from 2 to 10 parts each of (i) dawsonite, (ii) calcium oxide, and (iii) a magnesium compound selected from magnesium carbonate, magnesium borate and magnesium oxide, wherein the total number of parts of (ii) is at least one quarter the sum of the parts of (i), (ii) and (iii), all parts being by weight of the polymer composition.
Claim 16
Dependent Claim
29 words
A method according to claim 11 wherein the smoke suppressant combination comprises from 5 to 10 parts of dawsonite and 5 parts each of calcium oxide and magnesium carbonate.
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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) | 1982-01-22 | 1982-07-24 | 1983-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-22 | 1986-07-24 | 1987-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-22 | 1990-07-24 | 1991-01-23 | $7700.00 | Window Closed / Lapsed |