Patent ID: 6403702
Filing Date: 2002-06-11
Classification: C08G,C08K

Abstract:
A process for the preparation of one-shot polyurethane cast elastomers containing liquid, diurethane non-migrating plasticizers, comprising reacting via the one-shot process(A) at least one organic polyisocyanate component, (B) at least one isocyanate-reactive component, and (C) at least one chain extender and/or crosslinking agent, in the presence of (D) a liquid diurethane plasticizer having a viscosity of less than about 50,000 mPaÂ·s at 50Â° C., and comprising the reaction product of: (1) an asymmetrical diisocyanate component having an NCO group content of about 32.0 to about 48.3%, a functionality of about 2.0, a viscosity of less than about 1000 mPaÂ·s at 25Â° C., and comprising diphenylmethane diisocyanate having an isomer distribution of at least about 20% by weight of the 2,4â€²-isomer, less than 80% by weight of the the 4,4â€²-isomer, and about 0 to 5% by weight of the 2,2â€²-isomer; and (2) at least one monoalcohol having a molecular weight of about 100 to about 1,000 and an OH number of about 56 to about 560.