16-01-2020 дата публикации
Номер: US20200017720A1
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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. 1. An optically clear , curable adhesive comprising:a polyvinylbutyral having a dynamic viscosity of between about 9 and about 30 mPA·s and having a polyvinyl alcohol weight percent of between about 14% and about 21%; a diol;', 'at least one diisocyanate; and', 'a hydroxyfunctional (meth)acrylate or an isocyanatofunctional (meth)acrylate;, 'a polyurethane (meth)acrylate comprising the reaction product ofa (meth)acrylate monomer; anda photoinitiator;wherein 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 optical clarity of greater than about 98% when cured, andwherein the optically clear, curable adhesive has a peel adhesion of at least about 100 g/cm based on ASTM 3330 when cured.2. The optically clear claim 1 , curable adhesive of claim 1 , wherein the diol is selected from one of a poly(tetramethylene oxide) diol having a number average molecular weight of about 2000 g/mol or less claim 1 , a poly(propylene oxide) diol having a number average ...
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