Patent ID: 6183679
Filing Date: 2001-02-06
Classification: B29C,C08G,C08L

Abstract:
A process for producing an injection-molded product of polyglycolic acid, comprising the steps of charging an injection molding machine equipped with an injection mold with pellets formed of a thermoplastic resin material which comprises polyglycolic acid having a repeating unit represented by the following formula (1): ##STR9##and the following physical properties:(a) the melt viscosity, .eta.* (as measured at a temperature of the melting point, Tm of the polymer+20.degree. C., and a shear rate of 1,000/sec) being 30-10,000 Pa.multidot.s;(b) the melting point, Tm being at least 150.degree. C.;(c) the melt enthalpy, .DELTA.Hm being at least 20 J/g; and(d) the density being at least 1.50 g/cm.sup.3 as measured in an unoriented, crystallized form; and injection-molding the pellets at a cylinder temperature of Tm to 255.degree. C., a mold temperature of 0.degree. C.-Tm and an injection pressure of 1-10.sup.4 MPa.