Radiation curable clear urethane acrylate adhesive with acrylic acid monoacrylates, and optional multiacrylate

A radiation-curable clear homogeneous fluid adhesive composition for the production of clear glass laminate comprising (a) a urethane acrylate component in (b) liquid .alpha.,.beta.-ethylenically unsaturated diluent component;

• said urethane acrylate component comprises at least one urethane acrylate having an average of at least about 2 .alpha.,.beta., ethylenically unsaturated groups per molecule and being obtainable by reaction of an oligomeric urethane intermediate having end groups selected from the --OH and --NCO with an .alpha.,.beta.,-ethylenically unsaturated compound which has a group reactive with an end group of the intermediate and also a carboxy (--COO) group attached to a carbon atom which is attached to a methylene group by a double bond, and not less than a major proportion of said urethane acrylate component is formed of material having a molecular weight (M.sub.N) above 1500, and substantially all of the unsaturation in the urethane acrylate is terminal alpha, beta-unsaturation,
• said diluent component comprises (i) acrylic acid, (ii) an effective amount of at least one acrylate selected from the group consisting of monoesters of acrylic acid and alkanols having from 1 to 6 carbon atoms and substituted derivatives of such alkanols wherein each substituent contains only carbon, hydrogen and oxygen atoms, said component (i) being present in an amount of from 35% to 90% by weight, based on the total weight of component (i) and component (ii),
• and components (i) and (ii) form more than 50% of the diluent,
• (iii) from 0% to about 40% by weight based on the weight of the diluent of a multiacrylate selected from the group consisting of the di- and higher esters of acrylic acid with polyhydric alcohols;
• and
• said urethane acrylate component forms 45% to 75% by weight of the mixture of urethane acrylate and diluent, and the diluent forms from 55% to 25% by weight of said mixture.