1,2-Polybutadiene compositions and cured flame retarded 1,2-polybutadiene resin materials
AssigneeFujitsu Limited
InventorsNorio Sawatari, Isao Watanabe, Kazumasa Saito, Katsura Adachi
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Abstract
Flame retardation of 1,2-polybutadiene based upon the use of halogenated bisphenol bisacrylate reactive flame retardants, for example, 2,2-bis(4-methacryloyl-3,5-dibromophenyl)-propane. Flame retardancy performance of UL 94 V-0 or V-1 has been achieved without impairing desirable dielectric properties and heat resistance inherently possessed by 1,2-polybutadiene. If an aromatic bismaleimide modifier, for example, N,N'-4,4'-diphenylmethane bismaleimide, is jointly used, a thermal expansion coefficient less than a half of the thermal expansion coefficient of cured 1,2-polybutadiene can be achieved.
Claims26
A composition curable to a flame-retarded resin material, comprising:
- (A) a polybutadiene polymer wherein at least 50% of the recurring units consist of 1,2-butadiene units;
- (B) 40 to 200 parts by weight, based on 100 parts by weight of said butadiene polymer, of at least one reactive flame retardant selected from the group consisting of bisphenol bisacrylate compounds having the formula:
- ##STR12## wherein X is Br or Cl, Y is H or --CH.sub.3, m and n each is an integer from 1 through 4, and A is a direct bond, --O--, --CO--, --SO.sub.2 --, --CH.sub.2 --.sub.b, wherein b is an integer from 1 through 4, --CH.dbd.CH-- or ##STR13## and polymers of such bisphenol bisacrylate compounds, and;
- (C) a curing-promoting amount of an organic peroxide.
A cured flame retarded resin material exhibiting a flame retardancy performance of at least V-1, as measured according to the Underwriters Laboratories Standard UL 94 using the Vertical Burning Test, said material being obtained by curing a composition comprising:
- (A) A polybutadiene polymer wherein at least 50% of the recurring units consist of 1,2-butadiene units;
- (B) 40 to 200 parts by weight, based on 100 parts by weight of said butadiene polymers, of at least one reactive flame retardant selected from the group consisting of bisphenol bisacrylate compounds having the formula:
- ##STR17## wherein X is Br or Cl, Y is H or --CH.sub.3, m and n each is an integer from 1 to 4, and A is a direct bond, --O--, --CO--, --SO.sub.2 --, --CH.sub.2 --.sub.b, wherein b is an integer of 1 through 4, --CH.dbd.CH-- or ##STR18## polymers of such bisphenol bisacrylate compounds, and;
- (C) a curing-promoting amount of an organic peroxide.
Dependencies are inferred from the claim text.