Polyurethane adhesives based on omega,omega'-diisocyanate dimethylcyclohexane

Abstract

Abstract THIS INVENTION RELATES TO AN ADHESIVE COMPOSITION WHICH IS ESPECIALLY SUITABLE FOR BONDING POLYESTER OR POLYOLEFINES TO EACH OTHER OR TO OTHER SUBSTRATES, WHICH COMPOSITION COMPRISES 8A) A LINEAR HIGH MOLECULAR POLURETHANE PREPARED BY REACTING A DIOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 500 TO ABOUT 3,000 WITH W,W''-DIISOCYANATO DIMETHYLCYCLOHEXANE IN ALUNTS SUCH AS TO PROVIDE A RATIO OF NCO.OH OF ROUND 1, AND (B) ABOUT 1-10 PARTS BY WEIGHT OF W,W''-DIISOBYANATO DIMETHYLCYCLOHEXANE OR ITS NCO-TERMINATED PREPOLYMER PREPARED BY REACTING A LOW MOLECULAR DIOL OR POLYOL HAVING A MOLECULAR WEIGHT OF NOT HIGHER THAN ABOUT 400 AND HAVING AT 2 HYDROXYL GROUPS PER MOLECULE WITH AN EXCESS AMOUNT OF W,W''-DIISOCYANOTO DIMETHYLCYCLOHEXANE, ANOTHER VARIATION OF THE PRESENT INVENTION IS THE USE OF AN ADHESIVE COMPOSITION MADE UP OF (C) A HYDROXYL-TERMINATED POLYURETHANE PREPOLYMER PREPARED BY REACTING A DIOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 5000 TO ABOUT 3,000 WITH W,W''-DIISOCYANATO DIMETHYLCYCLOHEXANE IN AMOUNTS SUCH THAT THE RATIO OF NCO/OH IS SLIGHTLY HIGHER THAN 1, TO GIVE AN NCO-TERMINATED PREPOLYAND THEN REACTING THE RESULTANT NCO:TERMINAL PREPOLYMER WITH A LOW MOLECULAR POLYOL HAVING AT LEAST 3-HYDROXDROXYL GROUPS PER MOLECULE IN SUCH AN AMOUNT THAT THE RATIO OF NCO/OH IS ABOUT 3 TO ABOUT 10, AND (D) AN NCO-TERMINATED PREPOLYMER PREPARED BY REACTING A LOW MOLECULAR DIOL OR POLYOL HAVING A MOLECULAR WEIGHT OF NOT HIGHER THAN ABOUT 400 AND HAVING AT LEAST 2 HYROX W,W''-DIISOCYANATO DIMETHYLCYCLOHEXANE.

Inventors

• 👤 Y Matsui
• 👤 S Kazama
• 👤 M Nakabayashi

Bibliographic Details