Urethane (meth) acrylate oligomer, process for its production and photocurable composition
AssigneeAsahi Glass Company, Limited
InventorJosho Kashiwame
Life of this patent
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Abstract
A urethane (meth)acrylate oligomer which has a low viscosity and gives a flexible cured article reduced in surface tackiness. It is obtained by reacting a polyol ingredient comprising a polyoxyalkylene polyol which has two to four hydroxyl groups, a hydroxyl value VOH (mg-KOH/g) of from 5 to 115, and a total degree of unsaturation VUS (meq/g) satisfying the relationship VUS≦(0.45/VOH)+0.02, with a polyisocyanate compound and a hydroxylated (meth)acrylate compound.
Claims13
A urethane (meth)acrylate oligomer obtained by reacting a polyol component (A) consisting of a polyoxypropylene polyol which has from 2 to 4 hydroxyl groups, a hydroxyl value VOH (mgKOH/g) of from 9 to 17 and a total degree of unsaturation VUS (meq/g) satisfying the formula 1, with a polyisocyanate compound (B) and a hydroxylated (meth)acrylate compound (C):
- VUS≦(0.45/VOH)+0.02 Formula 1.
A process for producing a urethane (meth)acrylate oligomer, which comprises reacting a polyol component (A) consisting of a polyoxypropylene polyol which has from 2 to 4 hydroxyl groups, a hydroxyl value VOH (mgKOH/g) of from 9 to 17 and a total degree of unsaturation VUS (meq/g) satisfying the formula 1, with a polyisocyanate compound (B) and a hydroxylated (meth)acrylate compound (C):
- VUS≦(0.45/VOH)+0.02 Formula 1.
Dependencies are inferred from the claim text.