Abstract In accordance with the present invention, there are provided polyester carbonate copolymers obtained by polymerization of a mixture of 20-80% by weight of an alkylene terephthalate oligomer [I] containing ethylene terephthalate as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g, and 20-80% by weight of a carbonate oligomer [II] containing 2,2-bis(4 -hydroxyphenyl)propane as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g, said copolymers having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of 0.4-1.2 dl/g and a glass transition temperature (Tg) of 80°-140° C. with a single peak, and polyester resin compositions containing said copolymers, said resin composition being excellent in transparency, heat resistance and mechanical strength.
A polyester resin composition comprising (i) 50-10 parts by weight of polyalkylene terephthalate, (ii) 50-90 parts by weight of polycarbonate (provided (i)+(ii)=100 parts by weight) and (iii) 3-50 parts by weight, based on 100 parts by weight of the sum total of (i) and (ii), of a polyester carbonate copolymer, said polyester carbonate copolymer (iii) being a polyester carbonate copolymer obtained by polymerization of a mixture of 20-80% by weight of an alkylene terephthalate oligomer [I] containing ethylene terephthalate as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g and 20-80% by weight of a carbonate oligomer [II] containing 2,2-bis(4-hydroxyphenyl)propane as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g, and said copolymer having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of 0.4-1.2 dl/g and a glass transition temperature (Tg) of 80°-140° C. with a single peak.
Claim 2
Dependent Claim
165 words
A polyester resin composition comprising (i) 50-10 parts by weight of polyalkylene terephthalate, (ii) 50-90 parts by weight of polycarbonate (provided (i)+(ii)=100 parts by weight) and (iii) 3-50 parts by weight, based on 100 parts by weight of the sum total of (i) and (ii), of a polyester carbonate copolymer, said polyester carbonate copolymer (iii) being a polyester carbonate copolymer obtained by polymerization of a mixture of 20-80% by weight of an alkylene terephthalate oligomer [I] containing ethylene terephthalate as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g and 20-80% by weight of a carbonate oligomer [II] containing 2,2-bis(4-hydroxyphenyl)propane as main structural units and having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of less than 0.6 dl/g, and said copolymer having an intrinsic viscosity [η], as measured at 25° C. in o-chlorophenol, of 0.4-1.2 dl/g and a glass transition temperature (Tg) of 80°-140° C. with a single peak.
Claim 3
Dependent Claim
36 words
The polyester resin composition as claimed in claim 1 wherein the amount of the alkylene terephthalate oligomer [I] present is 20-50% by weight and the amount of the carbonate oligomer [II] present is 50-80% by weight.