Patent ID: 7619013
Filing Date: 2009-11-17
Classification: C08J,Y02W,Y10T

Abstract:
1. A process for producing a resin composition satisfying the below-mentioned condition 2 which comprises the steps of mixing a pulverized waste plastic material containing a major portion of a thermoplastic resin and 0.001 to 2 weight % of a non-thermoplastic solid foreign material and satisfying the below-mentioned condition 1 with light-shielding components comprising a white pigment, a colored pigment, a black pigment or combination thereof to give a mixture, and melting the mixture under heating, condition 1: a sheet made from the pulverized waste plastic material shows a relationship between a lightness and a light transmittance satisfying the following condition: wherein C means a lightness of a sheet of 3 mm thick having been made of the pulverized waste plastic material, and D means a total light transmittance in terms of % of a sheet of 50 μm thick having been made of the pulverized waste plastic material, condition 2: a sheet made from the resin composition shows a lightness in the range of 30 to 90, a light transmittance in the range of 15 to 70%, and a relationship between the lightness and light transmittance satisfying the following condition: wherein A means a lightness of a sheet of 3 mm thick having been made of the resin composition, and B means a total light transmittance in terms of % of a sheet of 50 μm thick having been made of the resin composition.