US 9,957,347 B2 · Reduced discoloration of thermoplastic polyurethanes based on polymer polyols via incorporation of aliphatic isocyanates

Abstract

The present invention relates to a process for producing a polyurethane, comprising at least the following steps (A) bringing at least one polymer polyol into contact with an amount of from 0.1 to 20 mol %, based on the entire amount of polyisocyanate, of at least one first polyisocyanate, in order to obtain a prepolymer which in essence has terminal hydroxy groups, and (B) bringing the prepolymer from step (A) into contact with at least one second polyisocyanate and optionally with further additives, in order to obtain the polyurethane, to a polyurethane obtainable via said process, and also to the use of this polyurethane as cladding in automobiles, coatings, cables, plug connectors, solar modules, foils, moldings, shoe soles and shoe components, balls and ball components, rollers, fibers, profiles, laminates and wiper blades, hoses, cable plugs, bellows, drag cables, cable sheathing, gaskets, nonwoven fabrics, drive belts, or damping elements.

Claims3

Dependent claims

A process for producing a polyurethane, comprising:

(A) reacting a polyesterpolyol and/or polyetherpolyol with an amount of from 0.5 to 12 mol %, based on the entire amount of polyisocyanate, of a first polyisocyanate which is an aliphatic polyisocyanate, in order to obtain a prepolymer, wherein more than 70% of terminal groups present are terminal hydroxy groups;
and
(B) reacting the prepolymer from the reacting (A) with a second polyisocyanate and optionally with a further additive, in order to obtain the polyurethane, wherein the entire amount of polyisocyanate is composed of the amount added in the reacting (A) and the amount added in the reacting (B),
wherein the first and the second polyisocyanate are different and
the prepolymer, in which more than 70% of the terminal groups present are terminal hydroxy groups, is not isolated after the reacting (A) and is used directly in the reacting (B).

2 more elements

Dependencies are inferred from the claim text.

Reduced discoloration of thermoplastic polyurethanes based on polymer polyols via incorporation of aliphatic isocyanates

Life of this patent

Reduced discoloration of thermoplastic polyurethanes based on polymer polyols via incorporation of aliphatic isocyanates

Life of this patent

Abstract

Claims3