Claims
- 1. A flame resistant resin composition comprising:A) from about 50 to about 90 parts by weight of a rubber modified polymer derived from a vinyl aromatic monomer, B) from about 1 to about 8 parts by weight of an polymeric impact modifier, C) from about 0.5 to about 5 parts by weight of a polyolefin having a high density density of greater than 0.940 g/cm3 and a melt flow rate of 0.9 less as measured according to ASTM D1238 at 190° C. using a 2.16 kg weight, D) a sufficient amount of a halogen containing flame retardant to provide the composition with 7 to 14 parts by weight halogen, and E) from about 2 to about 6 parts by weight of an inorganic flame retardant synergist.
- 2. The composition of claim 1 wherein the rubber modified polymer is high impact polystyrene.
- 3. The composition of claim 1 wherein the impact modifier is selected from the group consisting of polybutadiene, polyisoprene, a diblock or triblock copolymer of a vinyl aromatic monomer and a conjugated diene, a copolymer of a vinyl aromatic monomer and a hydrogenated diene, an ethylene-acrylic acid copolymer and an ethylene-styrene copolymer.
- 4. The composition of claim 3 wherein the impact modifier is a styrene-butadiene-styrene copolymer.
- 5. The composition of claim 1 wherein the flame retardant is selected from the group consisting of a hexahalodiphenyl ether, a octahalodiphenyl ether, a decahalodiphenyl ether, a decahalobiphenyl ethane, a 1,2-bis(trihalophenoxy)ethane, a 1,2-bis(pentahalophenoxy)ethane, a hexahalocyclododecane, a tetrahalobisphenol-A, an ethylene(N, N′)-bis-tetrahalophthalimide, a tetrahalophthalic anhydride, a hexahalobenzene, a halogenated indane, a halogenated phosphate ester, a halogenated paraffin, a halogenated polystyrene, and a polymer of a halogenated bisphenol-A and epichlorohydrin, and mixtures thereof.
- 6. The composition of claim 5 wherein the flame retardant is a bromine compound.
- 7. The composition of claim 6 wherein the flame retardant is decabromodiphenyl ether.
- 8. The composition of claim 6 wherein the flame retardant is a mixture of decabromodiphenyl ether and tetrabromobisphenol-A.
- 9. The composition of claim 1 wherein the inorganic flame retardant synergist is selected from the group consisting of iron oxide, tin oxide, zinc oxide, aluminum trioxide, alumina, antimony tri- and pentoxide, bismuth oxide, molybdenum trioxide, tungsten trioxide, zinc borate, an antimony silicate, ferrocene and combinations thereof.
- 10. The composition of claim 9 wherein the inorganic flame retardant synergist is antimony trioxide.
- 11. The composition of claim 1 wherein the polyolefin is high density polyethylene or polypropylene.
- 12. The composition of claim 11 wherein the polyolefin is high density polyethylene.
- 13. A molded article of the composition of claim 1.
Parent Case Info
This application claims the priority of a copending provisional application, Ser. No. 60/006,703 filed on Nov. 14, 1995.
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Number |
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Provisional Applications (1)
|
Number |
Date |
Country |
|
60/006703 |
Nov 1995 |
US |