| abstract |
THIS INVENTION RELATES TO THE MANUFACTURE OF POLY(OXYTETRAMETHYLENE)-POLYURETHANE PRODUCTS WHICH EXHIBIT MARKEDLY IMPROVED TENSILE STRENGTH WHILE RETAINING A HIGH LEVEL OF OTHER MACHANICAL PROPERTIES. THESE PRODUCTS ARE PREPARED BY REACTING (I) A MIXTURE OF POLYMERIC DIOLS WHICH COMPRISES DEFINED AMOUNTS OF RELATIVELY HIGH MOLECULAR WEIGHT POLY(OXYCAPROLY) DIOL AND RELATIVELY LOW MOLECULAR WEIGHT POLY(TETRAMETHYLENE OXIDE) GLYCOL WITH (II) A DIISOCYANATE COMPOUND AND (III) A DIFUNCTIONAL CHAIN EXTENDER, AND OPTIONALLY, ADDITIONAL INGREDIENTS SUCH AS CATALYST, SURFACTANT, BLOWING AGENT, DYES, ETC. |