US4459381A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame retardant high impact p-methylstyrene compositions
Assignee: Mobil Oil AS
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Filing: 1982-11-15
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Granted: 1984-07-10
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Expires: 2002-11-15
Abstract
Abstract The present invention provides a non-foamed flame-retardant article of polymeric composition comprising at least 20% by weight of a monomer mixture comprising 0-0.1% by weight o-methylstyrene 0-15% by weight m-methylstyrene and at least 85% by weight p-methylstyrene; 0-80% by weight of a different ethylenic unsaturated monomer; and a sufficient amount of flame-retardants wherein the amount of flame-retardants is substantially less than would be needed had the p-methylstyrene been replaced with styrene analogs. The flame retardancy is achieved by the addition of organophosphorus or halogenated organophosphorus flame retardants. High impact resistance is achieved by the incorporation of a rubbery polymer into the polymeric composition.
Inventors
- 👤 Viren P. Trivedi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:26
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/49; C08K5/51; C08K5/52; C08K5/53; C08K5/5317; C08K5/5333
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
97 words
A non-foamed, flame-retarded article comprising: a. methylstyrene resin containing at least 20% by weight of polymerized units derived from a mixture of methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene, and 0 to 80 percent by weight of a different ethylenically unsaturated monomer; and b. a sufficient amount of organophosphorus flame-retardant to achieve at least a V-2 flame-retardancy under UL-94 test wherein said sufficient amount of flame-retardants is substantially less than that required for polystyrene analogs to achieve the same V-2 flame-retardancy.
Claim 2
Dependent Claim
97 words
A non-foamed, flame-retarded article comprising: a. methylstyrene resin containing at least 20% by weight of polymerized units derived from a mixture of methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene, and 0 to 80 percent by weight of a different ethylenically unsaturated monomer; and b. a sufficient amount of organophosphorus flame-retardant to achieve at least a V-2 flame-retardancy under UL-94 test wherein said sufficient amount of flame-retardants is substantially less than that required for polystyrene analogs to achieve the same V-2 flame-retardancy.
Claim 3
Dependent Claim
23 words
The article of claim 1 wherein a sufficient amount of organophosphorus flame-retardants is added to achieve a V-0 flame-retardancy under UL-94 flammability test.
Claim 4
Dependent Claim
30 words
The article of claim 1 wherein the mixture of isomers of methylstrene consists essentially of at least 90% by weight para-methylstyrene, O-10% by weight meta-methylstyrene, and 0-0.1% by weight ortho-methylstyrene.
Claim 5
Dependent Claim
30 words
The article of claim 1 wherein the mixture of isomers of methylstyrene consists essentially of at least 95% by weight para-methylstyrene, 0-5% by weight meta-methylstyrene, and 0-0.05% by weight ortho-methylstyrene.
Claim 6
Dependent Claim
28 words
The article of claim 1 wherein said sufficient amount of flame-retardant is at least 40% less than that required for polystyrene analogs to achieve the same V-2 flame-retardancy.
Claim 7
Dependent Claim
28 words
The article of claim 2 wherein said sufficient amount of flame-retardant is at least 25% less than that required for polystyrene analogs to achieve the same V-0 flame-retardancy.
Claim 8
Dependent Claim
22 words
The article of claim 1 wherein the flame-retardancy is achieved by the addition of a sufficient amount of a halogenated organophosphorus flame-retardant.
Claim 9
Dependent Claim
42 words
The article of claim 1 wherein the flame-retardancy is achieved by the addition of a flame-retardant selected from the group consisting of Bis(2-chloroethyl)-2-chloroethylphosphonate, adducts of dimethyl methyl phosphonate and trimethylolpropane phosphite, Bis(beta chloroethyl) vinylphosphonate, tri(β,β'-dichloroisopropyl)phosphate, isopropyl phenyl diphenyl phosphate, and triphenyl phosphate.
Claim 10
Dependent Claim
25 words
The article of claim 8 wherein a rating of V-2 under UL-94 flammability test is achieved by adding less than 15% by weight total flame-retardant.
Claim 11
Dependent Claim
123 words
A non-foamed, high impact, flame-retarded article comprising: (a) a high impact graft copolymer produced by grafting a methylstyrene resin onto a backbone polymer chain which is of a rubbery nature wherein the methylstyrene resin contains at least 20% by weight of polymerized units derived from a mixture of methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene, and 0 to 80 percent by weight of a different ethylenically unsaturated monomer; and (b) a sufficient amount of organophosphorus flame-retardant to achieve at least a V-2 flame-retardancy under UL-94 test wherein said sufficient amount of flame-retardants is substantially less than that required for polystyrene analogs to achieve the same V-2 flame-retardancy.
Claim 12
Dependent Claim
123 words
A non-foamed, high impact, flame-retarded article comprising: (a) a high impact graft copolymer produced by grafting a methylstyrene resin onto a backbone polymer chain which is of a rubbery nature wherein the methylstyrene resin contains at least 20% by weight of polymerized units derived from a mixture of methylstyrene isomers consisting essentially of 0-0.1 percent by weight ortho-methylstyrene, 0-15 percent by weight meta-methylstyrene, and at least 85 percent by weight para-methylstyrene, and 0 to 80 percent by weight of a different ethylenically unsaturated monomer; and (b) a sufficient amount of organophosphorus flame-retardant to achieve at least a V-2 flame-retardancy under UL-94 test wherein said sufficient amount of flame-retardants is substantially less than that required for polystyrene analogs to achieve the same V-2 flame-retardancy.
Claim 13
Dependent Claim
23 words
The article of claim 10 wherein a sufficient amount of organophosphorus flame-retardants is added to achieve a V-0 flame-retardancy under UL-94 flammability test.
Claim 14
Dependent Claim
30 words
The article of claim 10 wherein the mixture of isomers of methylstyrene consists essentially of at least 90% by weight para-methylstyrene, 0-10% by weight meta-methylstyrene, and 0-0.1% by weight ortho-methylstyrene.
Claim 15
Dependent Claim
30 words
The article of claim 10 wherein the mixture of isomers of methylstyrene consists essentially of at least 95% by weight para-methylstyrene, 0-5% by weight meta-methylstyrene, and 0-0.05% by weight ortho-methylstyrene.
Claim 16
Dependent Claim
28 words
The article of claim 10 wherein the backbone polymer chain is selected from the group consisting of polybutadiene, a styrene-butadiene rubber, an ethylene-propylene rubber, and an ethylene-propylene-diene elastomer.
Claim 17
Dependent Claim
28 words
The article of claim 10 wherein said sufficient amount of flame-retardant is at least 40% less than that required for polystyrene analogs to achieved the same V-2 flame-retardancy.
Claim 18
Dependent Claim
28 words
The article of claim 11 wherein said sufficient amount of flame-retardant is at least 25% less than that required for polystyrene analogs to achieve the same V-0 flame-retardancy.
Claim 19
Dependent Claim
22 words
The article of claim 10 wherein the flame-retardancy is achieved by the addition of a sufficient amount of a halogenated organophosphorus flame-retardant.
Claim 20
Dependent Claim
42 words
The article of claim 10 wherein the flame-retardancy is achieved by the addition of a flame-retardant selected from the group consisting of Bis(2-chloroethyl)-2-chloroethylphosphonate, adducts of dimethyl methyl phosphonate and trimethylolpropane phosphite, Bis(beta chloroethyl) vinylphosphonate, tri(β,β'-dichloroisopropyl)phosphate, isopropyl phenyl diphenyl phosphate, and triphenyl phosphate.
Claim 21
Dependent Claim
25 words
The article of claim 18 wherein a rating of V-2 under UL-94 flammability test is achieved by adding less than 15% by weight total flame-retardant.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |