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Stabilized flame-retardant styrenic polymer compositions and the stabilizing flame-retardant mixtures used therein
| Details |
Inventors: Levek, Robert P.; Williams, David O.;
Assignee: Great Lakes Chemical Corporation (West Lafayette, IN)
Primary Examiner: Czaja; Donald E.
Assistant Examiner: Fletcher; H. H.
Attorney, Agent or Firm: Kirkland & Ellis
This application discloses stabilized flame-retardant styrenic polymer compositions comprising a bromine-containing flame-retardant, antimony trioxide and a three component stabilizer comprising a dialkyltin maleate, a hindered phenolic antioxidant, and a member selected from the group consisting of anhydrides of a cyclic dicarboxylic acid, ester derivatives thereof, imide derivatives thereof, and monomeric and dimeric polyesters. |
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DETAILED DESCRIPTION We claim: 1.
A stabilized flame-retardant polymer composition comprising a normally combustible styrenic polymer, about 2-15 phr antimony trioxide, about 4-30 phr of a bromine-containing flame retardant agent, and about 0.
5-3.
0 phr of a stabilizing composition comprising: about 50-80% of a dialkyltin maleate of the formula ##STR6## where R is a C.
sub.
1 -C.
sub.
8 alkyl radical; about 5-15% of a hindered phenolic antioxidant; and about 5-45% of a member selected from the group consisting of an anhydride of a cyclic dicarboxylic acid, C.
sub.
1 -C.
sub.
8 alkyl ester derivatives thereof, imide derivatives thereof, polymeric esters of acrylic and methacrylic acids, poly(alkene-vinyl acetate) copolymers, and poly(diallylphthalate), by weight of the stabilizing composition.
2.
A stabilized flame-retardant polymer composition, as claimed in claim 1, wherein the styrenic polymer is an acrylonitrile-butadiene-styrene copolymer and the flame-retardant agent is tetrabromobisphenol-A.
3.
A stabilized flame-retardant polymer composition, as claimed in claim 1, wherein the said styrenic polymer is polystyrene.
4.
A stabilized flame-retardant polymer composition, as claimed in claim 1, wherein said dialkyltin maleate is dibutyltin maleate.
5.
A stabilized retardant polymer composition, as claimed in claim 1, wherein the antioxidant is 2,6-di-tert-butyl-4-methyl phenol.
6.
A stabilized flame-retardant polymer composition, as claimed in claim 1, wherein the member is tetrahydrophthalic anhydride.
7.
A stabilized flame-retardant additive composition comprising a bromine-containing flame-retardant agent and about 1-60 parts per hundred parts of the flame-retardant agent of a stabilizing composition comprising: about 50-80% of a dialkyltin maleate of the formula ##STR7## where R is a C.
sub.
1 -C.
sub.
8 alkyl radical; about 5-15% of a hindered phenolic antioxidant; and about 5-45% of a member selected from the group consisting of an anhydride of a cyclic carboxylic acid, C.
sub.
1 -C.
sub.
8 alkyl ester derivatives thereof, imide derivatives thereof; polymeric esters of acrylic and methacrylic acids, poly(alkene-vinyl acetate) copolymers, and poly(diallyl phthalate), by weight of the stabilizing composition
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Adhesives and Rubbers 
