CPC C09J 7/385 (2018.01) [C08F 220/14 (2013.01); C08F 220/1804 (2020.02); C08F 220/20 (2013.01); C08G 18/12 (2013.01); C08G 18/246 (2013.01); C08G 18/3206 (2013.01); C08G 18/4063 (2013.01); C08G 18/61 (2013.01); C08G 18/6254 (2013.01); C08G 18/7831 (2013.01); C08G 18/7837 (2013.01); C08G 77/16 (2013.01); C09J 7/29 (2018.01); C08G 2170/00 (2013.01); C09J 2203/306 (2013.01); C09J 2203/354 (2020.08); C09J 2301/162 (2020.08); C09J 2301/302 (2020.08); C09J 2301/414 (2020.08); C09J 2433/00 (2013.01); C09J 2475/00 (2013.01); C09J 2483/00 (2013.01)] | 4 Claims |
1. A surface-protective pressure-sensitive adhesive sheet comprising a surface layer, a resin substrate layer and a pressure-sensitive adhesive layer, and having a multilayer structure with the resin substrate layer placed between the surface layer and the pressure-sensitive adhesive layer,
wherein the surface layer is a layer obtained by curing a heat-curable composition that comprises the following components:
(a) a hydroxyl group-containing (meth)acrylic copolymer having a glass transition temperature of −40° C. or higher and −22° C. or lower;
(b) an allophanate polyisocyanate and/or a biuret polyisocyanate;
(c) a polysiloxane comprising a hydroxyl group-containing hydrocarbon group and/or polymer; and
(d) a diol having a hydroxyl value of 200 mgKOH/g or higher and a molecular weight of 500 or lower.
|