High-value polyurethane elastomers and production thereof

摘要

The present invention relates to high-value polyurethane (PUR) and polyurethaneurea elastomers, which can be processed in a particularly simple manner by use of low-viscosity prepolymers based on naphthalene 1,5-diisocyanate, and to a process for production thereof.

主权项

1. A process for producing a low-viscosity NCO prepolymer based on naphthalene 1,5-diisocyanate, comprising:
a) reacting naphthalene 1,5-diisocyanate (NDI) with which from 0.05 to 0.7% by weight, based on component b), of naphthyl 1-isocyanate has been admixed continuously or batchwise with b) at least one polyol which has a number-average molar mass of from 850 to 3000 g/mol, viscosity of ≦2500 mPas measured at 120° C., and functionality of from 1.95 to 2.15, selected from the group consisting of polyester polyols, poly-ε-caprolactone polyols, polycarbonate polyols, polyether polyols, and α-hydro-ω-hydroxy-poly(oxytetramethylene) polyols, wherein the polyol is at a temperature of from 80° C. to 240° C. in a ratio of NCO groups to OH groups of from 1.5:1 to 3.05:1.