Patent ID: 6676870
Filing Date: 2004-01-13
Classification: B29B,B29C

Abstract:
A production process for a short fiber-filled thermoplastic resin composition, comprising:feeding to an upstream raw material first feeding port in an extruder having at least three raw material feeding ports, a fixed amount of a resin mixture comprising: (a) a resin containing polyolefin, an unsaturated carboxylic acid and an organic peroxide; (b) a resin containing polyolefin, an unsaturated carboxylic anhydride and an organic peroxide; or (c) a resin containing polyolefin, an unsaturated carboxylic acid, an unsaturated carboxylic anhydride and an organic peroxide; feeding to a downstream raw material second feeding port, a fixed amount of at least one alkaline earth metal selected from the group consisting of substances of alkaline earth metals, hydroxides of alkaline earth metals and oxides of alkaline earth metals, wherein the L/D of the first feeding port to the second feeding port is 10 or more; feeding a fixed amount of a fibrous material from a third feeding port to further melt-knead the resin; and cooling and pelletizing the mixture, wherein the resin mixture comprises 94 to 20% by weight of polyolefin, 0.01 to 5.0% by weight of the unsaturated carboxylic acid or/and unsaturated carboxylic anhydride, and 0.01 to 0.5% by weight of the organic peroxide is fed to the first feeding port; 0.01 to 5.0% by weight of the alkaline earth metal is fed to the second feeding port; and 5 to 80% by the weight of the fibrous material is fed from the third feeding port (% by the weight being a value based on the resin composition to be produced).