Patent ID: 9580847
Date: 2017-02-28
CPC Classifications: B32B,D04H

Claim:
1. A porous laminate, comprising: a layer A formed on a support, the layer A comprising a porous film containing polymer nanofibers; and a layer B formed on the layer A, the layer B comprising a porous film containing polymer nanofibers, wherein: an existence ratio of the polymer nanofibers contained in the layer A is larger than an existence ratio of the polymer nanofibers contained in the layer B; and a difference between the existence ratio of the polymer nanofibers contained in the layer A and the existence ratio of the polymer nanofibers contained in the layer B is more than 40%, wherein the existence ratio of the polymer nanofibers contained in the layer A is a ratio of a volume of the polymer nanoflbers contained in the layer A to a volume of the layer A, wherein the existence ratio of the polymer nanofibers contained in the layer B is a ratio of a volume of the polymer nanoflbers contained in the layer B to a volume of the layer B, and wherein the existence ratio of the polymer nanofibers contained in the layer A is 70% to 97%; and the existence ratio of the polymer nanofibers contained in the layer B is 10% to 45%.