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AQUEOUS POLYURETHANE SOLUTIONS FOR POLYURETHANE SYSTEMS

  • US 20090264587A1
  • Filed: 04/17/2009
  • Published: 10/22/2009
  • Est. Priority Date: 04/18/2008
  • Status: Abandoned Application
First Claim
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1. A process for preparing an aqueous solution of a hydroxy-functional polyurethane containing urea groups and having a hydroxyl group content in the range of from 2% to 10% by weight and a level of urea groups, calculated as —

  • NH—

    CO—

    NH—

    , derived from amino alcohols having a primary or secondary amino group and at least one hydroxyl group in the range of from 3% to 20% by weight, based in each case on the weight of said hydroxy-functional polyurethane containing urea groups, comprisingpreparing an NCO-functional prepolymer by single-stage or multi-stage reaction ofa) at least one hydroxy- and/or amino-functional hydrophilicizing agent having at least one acid group and/or the salt of an acid group, or having at least one tertiary amino group and/or the salt of a tertiary amino group;

    b) at least one polyol;

    c) at least one polyisocyanate; and

    d) optionally, other hydroxy- and/or amino-functional compounds, different from a), b), and e);

    and reacting said NCO-functional prepolymer withe) an amino alcohol component comprising an amino alcohol having a primary or secondary amino group and at least one hydroxyl group, wherein the fraction of amino alcohols having a secondary amino group, based on the total amount of e), is at least 60% by weight;

    and dissolving the resulting hydroxy-functional polyurethane containing urea groups in water, wherein said dissolution in water is preceded or accompanied by the reaction of the acid groups or tertiary amino groups of a) with a neutralizing agent.

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