Back to results
US 4,065,428 AGranted
Polymethylmethacrylate based molding compositions
AssigneeMonsanto Company
InventorGary L. Deets
Life of this patent
Estimating the term…
Abstract
Disclosed herein are polyblend molding compositions which comprise (A) a polymethylmethacrylate matrix polymer; (B) polychloroprene rubber which is grafted with methylmethacrylate; and (C) a metal oxide. Specimens molded from these polyblends have a UL-94 rating of at least V-1 and a smoke level of less than 300 D.sub.m Flaming using the NBS smoke test.
Claims11
A polyblend molding composition comprising:
- A. from 45 to 84 percent by weight bsed on the total weight of the polyblend of a polymethylmethacrylate polymer which contains from 0 to 40 percent by weight based on the weight of the matrix polymer of a halogenated comonomer;
- B. from 10 to 40 percent by weight based on the total weight of the polyblend of a polychloroprene rubber component, calculated as ungrafted rubber, which is grafted with from 10 to 100 parts, per hundred parts of rubber, of polymethylmethacrylate which contains from 0 to 40 percent by weight, based on the weight of the polymethylmethacrylate graft copolymer of a halogenated comonomer;
- and
- C. from 6 to 15 percent by weight based on the total weight of the polyblend of a flame retardant additive;
- provided that the total amount of halogen in the polyblend due to the polychloroprene rubber component and the halogenated comonomer is at least 9.0 percent by weight;
- and wherein the polyblend exhibits a UL-94 rating of at least V-1 and smoke evolution of less than 300 D.sub.m (Flaming).
3 more elements
A polyblend molding composition comprising:
- A. from 45 to 84 percent by weight based on the total weight of the polyblend of a polymethylmethacrylate polymer which contains from 10 to 35 percent by weight based on the weight of the matrix polymer of a halogenated comonomer;
- B. from 10 to 40 percent by weight based on the total weight of the polyblend of a polychloroprene rubber component, calculated as ungrafted rubber, which is grafted with from 10 to 100 parts, per hundred parts of rubber, of polymethylmethacrylate which contains from 10 to 35 percent by weight, based on the weight of the polymethylmethacrylate graft copolymer of a brominated comonomer;
- and
- C. from 6 to 15 percent by weight based on the total weight of the polyblend of antimony oxide;
- provided that the total amount of halogen in the polyblend due to the polychloroprene rubber component and the halogenated comonomer is at least 10 percent by weight;
- and wherein the polyblend exhibits a UL-94 rating of at least V-1 and smoke evolution of less than 300 D.sub.m (Flaming).
3 more elements
A polyblend molding composition comprising:
- A. from 45 to 84 percent by weight based on the total weight of the polyblend of a polymethylmethacrylate polymer which contains from 10 to 35 percent by weight based on the weight of the matrix polymer of a halogenated comonomer selected from the group consisting of chlorostyrene, bromostyrene, tribromoneopentyl acrylate, tribromoneopentyl methacrylate, tribromophenyl acrylate and tribromophenyl methacrylate;
- B. from 10 to 40 percent by weight based on the total weight of the polyblend of a polychloroprene rubber component, calculated as ungrafted rubber, which is grafted with from 10 to 100 parts, per hundred parts of rubber, of polymethylmethacrylate which contains from 10 to 35 percent by weight, based on the weight of the polymethylmethacrylate graft copolymer of a halogenated comonomer selected from the group consisting of chlorostyrene, bromostyrene, tribromoneopentyl acrylate, tribromoneopentyl methacrylate,, tribromophenyl acrylate and tribromophenyl methacrylate;
- C. from 6 to 15 percent by weight based on the total weight of the polyblend of antimony oxide;
- provided that the total amount of halogen in the polyblend due to the polychloroprene rubber component and the halogenated comonomer is at least 10 percent by weight;
- and wherein the polyblend exhibits a UL-94 rating of at least V-1 and smoke evolution of less than 300 D.sub.m (Flaming).
2 more elements
Dependencies are inferred from the claim text.