Polyurethane and its use in aqueous painting plastic

   
   

A polyurethane which has a number average molecular weight M.sub.n of from 3,000 to 50,000 and an acid number of from 10 to 35 and is preparable by reacting (a1) at least one polyesterpolyol having a number average molecular weight M.sub.n of from 1,000 to 4,000, an acid number of from 0 to 15, and an OH number of from 35 to 150, based on acyclic aliphatic and cycloaliphatic dicarboxylic acids, (a2) a mixture of at least one diol and one triol, (a3) at least one compound containing at least two isocyanate-reactive functional groups and at least one functional group capable of forming anions, and (a4) a mixture of at least one, acyclic aliphatic and at least one cycloaliphatic diisocyanate, to give an isocyanato-containing prepolymer that is then chain extended with a polyfunctional amine or amino alcohol and, if desired, is neutralized.

 
Web www.patentalert.com

< Three-dimensional image system

< Binding agents modified with nanoparticles, for coatings, and use thereof

> Surfactant copolymers based on methylidene malonate

> Media and methods for enhanced medical imaging

~ 00116