The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 09, 2019
Filed:
Dec. 03, 2014
Lintec Corporation, Itabashi-ku, JP;
Sayaka Enoki, Tokorozawa, JP;
Yuki Morita, Munich, DE;
LINTEC CORPORATION, Itabashi-ku, JP;
Abstract
There is provided a pressure sensitive adhesive sheet for wafer protection () comprising a base material (), an intermediate layer (), and a pressure sensitive adhesive layer () in this order, wherein the intermediate layer is a layer formed from an intermediate layer-forming composition containing 100 parts by mass of a non-energy ray-curable acrylic polymer (A) and 25 parts by mass or more of an energy ray-curable acrylic polymer (B) having a mass average molecular weight of 50,000 to 250,000; and the pressure sensitive adhesive layer is a layer formed from a pressure sensitive adhesive composition containing an energy ray-curable acrylic polymer (C). The inventive pressure sensitive adhesive sheet for wafer protection is excellent in interfacial adhesion between an intermediate layer and a pressure sensitive adhesive layer after energy ray irradiation. Therefore, the pressure sensitive adhesive sheet for wafer protection can suppress the deposition of a residue of the pressure sensitive adhesive layer to an adherend when it is removed after laminated to the adherend, has excellent followability even to an adherend having a large unevenness difference on a wafer surface, and has a small rate of change of adhesive strength even after being stored for a long period of time and has excellent stability with time.