Production of polyurethane plastics
AssigneeBayer Aktiengesellschaft
InventorDieter Dieterich
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Abstract
A process for the preparation of a polyurethane plastic in the form of coatings on the surface of substrates, from storage-stable liquid mixtures free of solvents and made of solid thermoplastic polyurethanes and polyurethane prepolymers. A storage-stable liquid system comprising solid polyurethane particles in liquid prepolymers where the two phases are incompatible with each other at the storage temperature.
Claims2
A storage stable dispersion of solid polyurethane or polyurea particles (a) in a liquid prepolymer (b) (liquid or pasty) suitable for the production of polyurethane plastics substantially without the use of added solvents where the dispersion comprises two components
- a. 30-80 wt. % solid thermoplastic polyurethane or polyurea particles having particle sizes between 0.5-300.mu. and a ring and ball softening point below about 200.degree.C. which are insoluble in component b) at temperatures below at least 30.degree.C. and which are soluble in component b) at temperatures above about 80.degree.C. as noncoherent disperse phase and
- b. 20-70 wt. % of a liquid polyurethane prepolymer as coherent phase.
Dependencies are inferred from the claim text.