Patent ID: 6046251
Filing Date: 2000-04-04
Classification: B29C,C08G,C08L

Abstract:
An injection-molded product obtained by injection molding a thermoplastic resin material, wherein the thermoplastic resin material comprises a polyglycolic acid homopolymer or copolymer having a repeating unit represented by the following formula (1): ##STR9## in a proportion not lower than 70 wt. % and a repeating unit derived from at least one cyclic comonomer selected from the group consisting of ethylene oxalate and lactide in a proportion not higher than 30 wt. %, and having the following physical properties:(a) a melt viscosity, .eta.*, measured at a temperature of the melting point, Tm, of the polyglycolic acid homopolymer or copolymer +20.degree. C. and a shear rate of 1,000/sec, of 30-10,000 Pa.multidot.s;(b) a melting point, Tm, of at least 150.degree. C.;(c) a melt enthalpy, .DELTA.Hm, of at least 20 J/g; and(d) a density of at least 1.50 g/cm.sup.3 as measured in an unoriented, crystallized form;wherein the injection-molded product has Izod impact strength, unnotched, 25.degree. C., of at least 20 kJ/m.sup.2, tensile strength of a least 60 MPa, tensile elongation of at least 5%, flexural strength of at least 100 MPa, and flexural modulus of at least 5 GPa; andwherein the injection-molded product is obtained by injection molding at an injection temperature ranging from the melting point, Tm, of the homopolymer or copolymer to 255 .degree. C.