Method and composition for reducing extractable heavy metals from vinyl halide resin compositions
AssigneeSynthetic Products Company
InventorsPaulette Baker, Richard F. Grossman
Life of this patent
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Abstract
A polymeric polyvalent metal aromatic polycarboxylate is used in vinyl halide resin compositions containing heavy metal stabilizers to reduce extractable heavy metals from molded resin products when tested by the toxicity characteristic leaching procedure (TCLP) of 40 CFR 261.
Claims16
A vinyl halide resin composition comprising a vinyl halide resin, a heavy metal compound stabilizer for said resin and a polymeric polyvalent metal aromatic polycarboxylate, said aromatic polycarboxylate selected from the group consisting of terephthalate, trimesate, trimellitate, pyromellitate, isophthalate, and 2,6-naphthalene dicarboxylate, as an additive in an effective amount to reduce extraction of the heavy metal when said composition is exposed to the toxicity characteristic leaching procedure of 40 CFR 261.
A vinyl halide resin composition comprising a polymer or copolymer of vinyl chloride, a metal salt of a higher fatty acid selected from the group consisting of lead, cadmium, barium, and antimony, and mixtures of said metal salts, and a polymeric polyvalent metal aromatic polycarboxylate, said aromatic polycarboxylate selected from the group consisting of terephthalate, trimesate, trimellitate, pyromellitate, isophthalate and 2,6-naphthalene dicarboxylate, as an additive in an effective amount to reduce extraction of the heavy metal when said composition is exposed to the toxicity characteristic leaching procedure of 40 CFR 261.
A method for reducing extraction of heavy metals from a molded product of vinyl halide resin compositions comprising
- providing a vinyl halide resin composition containing a heavy metal compound stabilizer for said resin to produce a molded product,
- adding a polymeric polyvalent metal aromatic polycarboxylate, said aromatic polycarboxylate selected from the group consisting of terephthalate, trimesate, trimellitate, pyromellitate, isophthalate and 2,6-naphthalene dicarboxylate, as an additive in an effective amount to reduce extraction of the heavy metal when said molded product is exposed to the toxicity characteristic leaching procedure 40 CFR 261.
Dependencies are inferred from the claim text.