Patent ID: 7399376
Filing Date: 2008-07-15
Classification: B29K,B32B,G02B,Y10T

Abstract:
1. A method of forming a polarizing plate comprising: (a) providing two cover sheets, each cover sheet comprising a low birefringence protective polymer films, comprising cellulose ester and having an in-plane birefringence Δn (b) providing a PVA dichroic polarizing film; and (c) simultaneously or sequentially bringing said two cover sheets into contact with said PVA dichroic polarizing film such that said layer promoting adhesion to poly(vinyl alcohol)-containing films in each of said two cover sheets is in contact with said PVA dicliroic polarizing film, wherein prior to contact a glue composition is applied to said PVA dichroic polarizing film supplied from a supply reel or said two cover sheets entering a nip between pinch rollers, and wherein said glue composition is substantially free of dissolved polymer and comprises, for crosslinking PVA, a first crosslinking agent that comprises boron and a second crosslinking agent that comprises multivalent ion.