Polyester polyol, polyol agent for laminate adhesive, resin composition, curable resin composition, adhesive for laminate, back sheet for solar battery

摘要

Polyester polyol which is excellent in temporal stability that adhesion strength after curing is high when cured as a main agent for laminating adhesive and adhesion strength is not deteriorated in a moisture and heat resistance test and is excellent also in appearance after lamination processing, A resin composition used, a two-pack type laminating adhesive containing the resin composition, and a back sheet of a solar cell. Specifically, it has a resin structure obtained by reacting a branched alkylene diol, a long chain aliphatic dicarboxylic acid having 8 to 20 carbon atoms, and an aromatic tricarboxylic acid as a main component of an adhesive for two-pack type laminate, And has a weight average molecular weight (Mw) in the range of 10,000 to 100,000 and a molecular weight distribution (Mw / Mn) in the range of 3.0 to 4.7.