公开(公告)号：AU1179301A

公开(公告)日：2001-04-23

申请号：AU1179301

申请日：2000-10-16

Applicant: STAHL INT B V

Inventor： CHIRIVELLA JOSEP OLLER ,  MARTINEZ MARIO JIMENEZ ,  BRUTAU MONTSERRAT POUS

IPC: C08F290/06 ,  C08F299/06 ,  C08G18/08 ,  C08G18/10 ,  C08G18/65 ,  C08G18/67 ,  C09D5/00 ,  C09D133/14 ,  C09D175/00 ,  C09D175/04 ,  C08L75/04

Abstract: The invention relates to a process for the preparation of an aqueous dispersion of an anionic polyurethane in which initially a tertiary aminofunctional acrylic monomer is used as neutralizing agent for pendant carboxylic acid groups in dispersions of a polyurethane or a polyurethane/polyacrylate, whereafter the unsaturated monomers undergo in situ an addition polymerisation, optionally together with other unsaturated monomer. In the process the isocyanate terminated prepolymer may be reacted with 0-100% of a stoichiometric amount of a hydroxy functional unsaturated monomer before the dispersion in water. The tertiary amine functional usaturated monomer is preset in a ratio to the anionic residues to be neutralized in the polyurethane prepolymer from 0.3 to 2 and preferably from 0.7 to 1.5. Furthermore the amount of carboxylic acid functions in the isocyanate functional polyurethane prepolymer is from 1 to 15% and preferably from 2 to 10%. The invention also relates to dispersions prepared by the present process and to a coating or film obtained from said dispersion.