Polyarylate resin containing composition and method
AssigneeAtlantic Richfield Company
InventorBarry D. Dean
Life of this patent
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Abstract
Moldable polymer compositions comprising a polyarylate resin and a copolymer containing recurring units of a vinyl aromatic monomer and recurring units of a maleimide monomer are disclosed.
Claims18
A moldable polymer composition comprising from about 99.5 to about 1% by weight of a polyarylate resin derived from a dihydric phenol and a mixture of isophthalic acid and terephthalic acid and from about 0.5 to about 99% by weight of a copolymer containing from about 50 to about 60 mole % recurring units of a vinyl aromatic monomer and from about 40 to about 50 mole % recurring units of a maleimide monomer, said copolymer being thermodynamically miscible with said polyarylate resin.
A method of producing a molded polymer composition which comprises forming a blend comprising from about 99.5 to about 1% by weight of a polyarylate resin derived from a dihydric phenol and a mixture of isophthalic acid and terephthalic acid and from about 0.5 to about 99% by weight of a copolymer containing from about 50 to about 60 mole % recurring units of a vinyl aromatic monomer and from about 40 to about 50 mole % recurring units of a maleimide monomer, and molding the resulting blend.
The method of claim 7 in which which said maleimide monomer is an N-substituted maleimide monomer.
A method of improving the hydrolytic stability of a polyarylate resin derived from a dihydric phenol and a mixture of isophthalic acid and terephthalic acid upon molding which comprises incorporating into the polyarylate resin a copolymer containing from about 50 to about 60 mole % recurring units of a vinyl aromatic monomer and from about 40 to about 50 mole % recurring units of a maleimide monomer, the copolymer being present in the polyarylate resin in an amount sufficient to improve the hydrolytic stability of the polyarylate resin upon molding.
A method of reducing the melt viscosity of a polyarylate resin derived from a dihydric phenol and a mixture of isophthalic acid and terephthalic acid which comprises incorporating into the polyarylate resin a copolymer containing from about 50 to about 60 mole % recurring units of a vinyl aromatic monomer and from about 40 to about 50 mole % recurring units of a maleimide monomer, the copolymer being present in the polyarylate resin in an amount sufficient to reduce the melt viscosity of the polyarylate resin upon molding.
Dependencies are inferred from the claim text.