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1. (WO2018160614) HIGH PERFORMANCE PHOTOCURABLE OPTICALLY CLEAR ADHESIVE

Pub. No.:    WO/2018/160614    International Application No.:    PCT/US2018/020082
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: B32B 27/32
C09J 4/06
Applicants: 3M INNOVATIVE PROPERTIES COMPANY
Inventors: LIU, Lan Hong
XIA, Jianhui
KLUN, Thomas P.
KOWITZ, David A.
SHERMAN, Audrey A.
Title: HIGH PERFORMANCE PHOTOCURABLE OPTICALLY CLEAR ADHESIVE
Abstract:
The present invention is an optically clear, curable adhesive including a polyvinylbutyral, a polyurethane (meth)acrylate, a (meth)acrylate monomer, and a photoinitiator. The polyvinylbutyral has a dynamic viscosity of between about 9 and about 13 mPA•s and a polyvinyl alcohol weight percent of less than about 18%. The polyurethane (meth)acrylate includes the reaction product of a diol, at least one diisocyanate, and a hydroxyfunctional (meth)acrylate or an isocyanatofunctional (meth)acrylate. When the optically clear, curable adhesive is placed between two transparent substrates and made into a laminate, the laminate has a haze of less than about 6%, a transmission of greater than about 88%, and an optical clarity of greater than about 98% when cured. The optically clear, curable adhesive also has a peel adhesion of at least about 100 g/cm based on ASTM 3330 when cured.