Patent ID: 8993107
Filing Date: 2015-03-31
Classification: B32B,C03C,Y10T

Abstract:
1. A porous glass comprising: a porous layer including silica, and a matrix layer, wherein the porous layer is provided on the matrix layer, wherein pores attributed to spinodal phase separation and pores attributed to binodal phase separation are formed in the porous layer, and in the porous layer, the proportion of pores attributed to spinodal phase separation with respect to the proportion of pores attributed to binodal phase separation is reduced with increasing distance from a surface toward the inside of the porous layer, wherein in the porous layer, the proportion of the pores attributed to spinodal phase separation with respect to the proportion of the pores attributed to binodal phase separation is reduced with increasing distance from a surface of the porous layer toward the matrix layer, wherein the matrix layer contains silicon oxide, boron oxide and an alkali metal oxide, and wherein an average pore size of the porous glass is in the range of 0.001 micrometers to 1 micrometer.