Patent ID: 7524556
Filing Date: 2009-04-28
Classification: B29C,C08J,C08L,Y10T

Abstract:
1. A thermoplastic resin foamed article, wherein the foamed article has two opposite surfaces, wherein the foamed article has at least a skin layer which defines one of the opposite surfaces and has a porosity of 0% or more but less than 1%, a lower-expansion layer which has a porosity of not less than 1% but less than 40% and is arranged so as to be adjacent to the skin layer, and a higher-expansion layer which has a porosity of not less than 40% but less than 100% and is arranged so as to be adjacent to the lower-expansion layer, wherein the skin layer, the lower-expansion layer and the higher-expansion layer are made of the same thermoplastic resin, wherein the higher-expansion layer has therein cells, wherein cells located in a portion in the higher-expansion layer near the lower-expansion layer have a ratio of Da1 to Da2 of from 1 to 4 where Da1 denotes the length of the cells in the thickness direction of the higher-expansion layer and Da2 denotes the length of the cells in a direction perpendicular to the thickness direction, and wherein cells located in a central portion in the higher-expansion layer have a ratio of Db1 to Db2 of more than 4 but not more than 10, where Db1 denotes the length of the cells in the thickness direction of the higher-expansion layer and Db2 denotes the length of the cells in a direction perpendicular to the thickness direction.