Epoxy resin adhesive compositions containing an isocyanate terminated polyurethane prepolymer and a chain extender

Abstract

Abstract WHERE X AND X'' IS SH, OH, NH2 AND COOH AND R IS ALKYL, ARYL, ALIPHATIC, AROMATIC, AND BRANCHED ALIPHATIC; WHEREIN SUCH POLYMERIC MODIFIER HAS AN AVERAGE MOLECULAR WEIGHT OF AT LEAST ABOUT 500 BUT LESS THAN 5000 AND IS COMPATIBLE WITH THE EPOXY RESIN; AND WHEREIN THE MODIFIED EPOXY RESIN COMPOSITION ARE PARTICULARLY USEFUL IN ADHESIVE FORMULATIONS. X-R-X'' THIS INVENTION ID DIRECTED TO THERMOSETTABLE RESIN COMPOSITIONS COMPRISING ESSENTIALLY AN EPOXY RESIN AND BETWEEN ABOUT 5 TO 50 PARTS PER HUNDRED PARTS OF EPOXY RESIN OF A REACTIVE TERMINATED URETHANE TYPE POLYMERIC MODIFIER FOR SUCH EPOXY RESIN WHEREIN SUCH MODIFIER IS THE REACTION PRODUCT OF APPROXIMATELY TWO MOLAR EQUIVALENTS OF AN ORGANIC ISOCYANATE, APPROXIMATELY ONE MOLAR EQUIVALENT OF A POLYMERIC "BACKBONE" MATERIAL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 500 TO 5000, WHICH IS TERMINATED WITH AN ACTIVE HYDROGEN CAPABLE OF REACTING WITH SAID ORGANIC ISOCYANATE AND WHICH CONTAINS FLEXIBILIZING GROUPS IN THE MAIN POLYMER CHAIN, AND APPROXIMATELY ONE MOLAR EQUILVALENT OF A "CAPPANT" MATERIAL OF THE GENERAL FORMULA

Inventors

• 👤 Jerry Marvin Hawkins

Bibliographic Details