COMPOSITION ADHESIVE AMELIOREE A BASE DE RESINE EPOXY

1329112 Epoxy resins modified by polyurethanes or polythiourethanes DOW CHEMICAL CO 17 Nov 1970 [17 Nov 1969] 54692/70 Headings C3B C3P and C3R A curable resin composition comprises: (I) a polyglycidyl ether of a polyhydric phenol or of an alcohol, and (II) 5-50 parts by wt. per 100 parts of I of a modifier, compatible with I, having reactive terminal groups which is obtained from 2 moles of an organic diisocyanate (optionally in admixture with an organic monoisocyanate), 1 mole of a polymer, M.W. 500-5000, containing reactive hydrogen atoms and containing in its chain flexibilizing groups -O-, -S-, -CO-, -OCONH-, -CONH-, -NHCONH-, -SCONH-, -OSiO- or -C = C-C- and 1 mole of a material X-R-X1 or in which each X and X1 is independently SH, OH, NH 2 or COOH, R is an aliphatic or aromatic group; X11 and X111 each represent an organic radical containing an epoxy or thioepoxy group and R1 is a hydrocarbon radical. Typical examples of II are prepared from: (1) propylene oxide-propylene glycol polyether polyol (M.W. 2000), toluene diisocyanate and 4-mercaptobutanol; (2) a polyester of adipic acid and tripropylene glycol, toluene diisocyanate and 4-mercaptobutanol; and (3) a hydroxyl terminated butadiene - acrylonitrile polymer (85 : 15), toluene diisocyanate, phenyl isocyanate and 4-mercaptobutanol.