Process for preparation of a room-temperature curable resin

A process for the preparation of a room-temperature curable resin which comprises reacting a compound (A) containing at least two acryloyl groups and/or methacryloyl groups in a molecule, and having from 100 to 100,000 of number-average molecular weight, with an aminosilane compound (B) represented by formula, ##STR8## (wherein X is a hydrolyzable group selected from the group consisting of halogen, alkoxy, acryloxy, ketoxymate, amino, acid amide, aminoxy, mercapto, alkenyloxy groups;

• R.sub.1 is a C.sub.1 -C.sub.10 alkyl group, aryl group, or aralkyl group;
• R.sub.2 is a C.sub.1 -C.sub.10 bivalent alkyl group, aryl group, or aralkyl group;
• n is an integer of from 1 to 3, and m is an integer of from 1 to 10),
• at the ratio of at least 0.2 equivalents of primary amino groups contained in the compound (B) to equivalent of acryloyl groups and/or methacryloyl groups contained in the compound (A), under substantially water-free condition, subsequently reacting the reaction product of aminosilane-modified resin and, further with a monofunctional isocyanate compound (C) represented by formula,
• R.sub.3 --NCO
• (wherein R.sub.3 is a C.sub.1 -C.sub.25 alkyl group, aryl group, aralkyl group, (C.sub.2 H.sub.5 O).sub.3 Si--CH.sub.2).sub.3 or (CH.sub.3 O).sub.3 Si--CH.sub.2).sub.3) at the ratio of from 0.9 to 1.5 equivalents to equivalent of active hydrogen of amino groups contained in the aminosilane-modified resin, and under substantially water-free condition to obtain a room-temperature curable resin having 2 mg KOH or lower of an amine value.