Patent ID: 6013750
Filing Date: 2000-01-11
Classification: C08F,C08G,C08L,C09D,C09J,C09K

Abstract:
An aerobically-curing adhesive composition comprising:A) a hydrazone initiator system;B) at least one polyurethane (meth) acrylate compound of the general formul a[H.sub.2 C.dbd.CR.sup.1 --C(.dbd.O)--O--R.sup.2 --O--C(.dbd.O)--NH--].sub.n R.sup.3wherein:R.sup.1 is hydrogen or a methyl group;R.sup.2 is selected from the group consisting of linear or branched chain alkylene groups containing from 2 to 6 carbon atoms and polyoxyalkylene groups containing from 4 to 21 carbon atoms;n is 2 or 3,provided that when n is 2, R.sup.3 is:[--Q--NH--C(.dbd.O)].sub.2 [{--O--R.sup.4 --O--C(.dbd.O)--NH--Q'--NH--C(.dbd.O)}.sub.m --O--R.sup.4 --O--]whereinm is from 0 to 10; andR.sup.4 is selected from the group consisting of:a) a polycaprolactonediol residue;b) a polytetrahydrofurfuryldiol residue;c) a diol residue derived from a polyesterdiol which is characterized by a weight ratio of carbon to oxygen of greater than 2.6, a weight ratio of carbon to hydrogen of less than 10, and a molecular weight of from 1000 to 20,000; andd) a diol residue derived from a polyesterdiol which is liquid at 20.degree. C. and has a molecular weight of from 4000 to 10,000; andprovided further that when n is 3, R.sup.3 is:[--Q--NH--C(.dbd.O)--O--((CH.sub.2).sub.5 --C(.dbd.O)).sub.p --].sub.3 R.sup.5wherein R.sup.5 is a triol residue of a linear or branched chain trihydric alcohol containing from 3 tO 6 carbon atoms, and p is from 1 to 10; and Q and Q' independently are aromatic, aliphatic or cycloaliphatic groups containing from 6 to 18 carbon atoms which are derived from a diisocyanate or diisocyanate mixtures; andC) one or more comonomers selected from the group consisting of acrylate esters and methacrylate esters;wherein said composition contains from 20 to 80% by weight of said polyurethane (meth) acrylate compound and from 80 to 20% by weight of said comonomers, based on the total weight of polymerizable compounds in said composition.