Patent ID: 9133367
Filing Date: 2015-09-15
Classification: C08F,C09J,H01L,Y10T

Abstract:
1. An optically clear adhesive for a dicing die bonding film including a base film; an optically clear adhesive layer on the base film; and a bonding layer on the optically clear adhesive layer, the optically clear adhesive layer being formed from the optically clear adhesive, the optically clear adhesive comprising: a curing agent; and a (meth)acrylic copolymer that is a copolymer of a mixture of monomers including a (meth)acrylate having at least one alkyl group, a (meth)acrylate having at least one hydroxyl group, and at least one of a (meth)acrylate having at least one phosphate group and a (meth)acrylate having at least one silane group, wherein a peel strength between the optically clear adhesive layer formed from the optically clear adhesive and a stainless steel ring frame is about 1 N/25 mm to about 3 N/25 mm, the peel strength being determined by: attaching a sample of the optically clear adhesive layer to the stainless steel ring frame, pressing by one reciprocation of a press roller under a load of 2 kg at a rate of 300 mm/min, folding, turning over 180°, and peeling about 25 mm of a portion of the sample 30 minutes after the pressing, respectively fixing the sample and the stainless steel ring frame to an upper clip and a lower clip of a tensile tester, and measuring a load required to peel the sample by pulling at a tensile rate of 300 mm/min, and wherein the (meth)acrylic copolymer has a weight average molecular weight of 500,000 g/mol to 1,000,000 g/mol.