ADHESIVE SUBSTANCE FOR LAMINATED SHEETS Russian patent published in 2019 - IPC C08G18/62 C08G18/34 C09J175/04 C09J175/14 C08G18/67 C08K5/09 

FIELD: chemistry.

SUBSTANCE: present invention relates to an adhesive substance for laminated sheets. Said adhesive contains a urethane resin obtained by mixing: (A) of an acrylic polyatomic alcohol; (B) at least one substance selected from carboxylic acids and carboxylic anhydrides having a melting point not higher than 280 °C; and (C) a compound of an aliphatic isocyanate. Acrylic polyatomic alcohol (A) is obtained by polymerisation of a polymerisable monomer containing a monomer having a hydroxyl group and another monomer which contains acrylonitrile and (meth)acrylic ester. Glass transition temperature of the acrylic polyatomic alcohol ranges from -35 °C to 20 °C, and hydroxyl number is from 0.5 to 40 mg KOH/g. Quantitative content of acrylonitrile ranges from 1 to 40 parts per 100 parts of polymerisable monomers. Equivalent ratio of isocyanate groups for isocyanate (C) to hydroxyl groups of acrylic polyatomic alcohol (A) ranges from 0.5 to 4.5.

EFFECT: obtained adhesive has excellent initial adhesion to film in production of laminated sheet, tear strength after aging and resistance to hydrolysis for a long time at high temperature, and also does not adversely affect the appearance of the laminated sheet and the lamination process of the films, while improving the curing property.

1 cl, 3 dwg, 5 tbl, 19 ex