FILM-FORMING RADIATION-CURABLE ADHESIVE Russian patent published in 2015 - IPC C08G18/67 C08G18/75 C08G18/28 C09J175/16 

FIELD: chemistry.

SUBSTANCE: invention refers to a hot melt adhesive, using it and a method for adhesion of non-woven substrates. The hot melt adhesive is cross-linked by radiation and contains more than 35% of a polyurethane polymer at the hot melt adhesive. The polyurethane polymer in turns contains at least one reactive group polymerising by radiation generated by a reaction of A) reactive PU-prepolymer with a block structure with two or three NCO-groups per a molecule; one block has a structure of diisocyanate-polyol-diisocyanate and at least one block has a structure (diol-diisocyanate)_n, wherein polyol=diol or triol with molecular weight (M_N) more than 1,000 g/mole, diol=alkylene diol with molecular weight less than 300 g/mole and n is from 4 to 50, and B) is from 20 to 95 mole % of at least one low-molecular compound (B) containing a double bond polymerising by radical polymerisation, and a group reacting with NCO groups, and C) from 0 to 50 mole % of at least one compound (C), which has at least one group reactive to NCO groups, but is free from the groups polymerising under conditions of radical polimerisation with molecular weight from 32 to 4,000 g/mole and D) from 5 to 50 mole % of at least one radical light initiator (D), which has primary or secondary OH-groups; percentages refers to the number of NCO-groups of PU-prepolymer. The sum of B, C, D is supposed to make 100 mole %, and optionally containing additional polymers and/or additives.

EFFECT: producing the adhesive for adhesion of nonwoven substrates or for coating of labels, tapes and plasters with a self-adhesive layer.

20 cl, 6 ex