Patent ID: 8329287

Claim:
A void-containing resin molded product consisting of: a single polymer having crystallinity, which is free of incompatible resins, wherein the void-containing resin molded product has elongated voids whose longitudinal directions are aligned in one direction, wherein the elongated voids satisfy the expression h(avg)>T/100, where h(avg) denotes an arithmetic average of h(i)s which each denote a distance from a surface of the void-containing resin molded product to a center of each of 10 voids whose centers are closer to the surface of the void-containing resin molded product than are centers of any other voids in a cross-section of the void-containing resin molded product that is perpendicular to a direction in which the voids are aligned, the 10 voids being selected from voids in a region defined by one straight line which is parallel to a thickness direction of the void-containing resin molded product and another straight line which is parallel to and distant by 20×T from the one straight line; and T denotes an arithmetic average thickness of the cross-section, wherein the elongated voids have a ratio L/r of 10 or more, where L denotes an average length of the voids (in μm) in the direction in which the voids are aligned, and r denotes an average length of the voids (in μm) in the thickness direction which is perpendicular to the direction in which the voids are aligned, and wherein the void-containing resin molded product has a glossiness of 50 or higher, and has a ratio M/N of 0.2 or less, where M denotes a transmittance (%) of the void-containing resin molded product with respect to light having a wavelength of 400nm to 800nm, and N denotes a transmittance (%) of a void-free polymer molded product, with respect to the same light, having the same thickness as the void-containing resin molded product and consisting of the same polymer that forms the void-containing resin molded product.