Solvent free polyurethane dispersions for hard surface coatings

Solvent free polyurethane dispersions for hard surface coatings

  • CN 101,283,014 A
  • Filed: 08/31/2006
  • Published: 10/08/2008
  • Est. Priority Date: 09/02/2005
  • Status: Active Application
First Claim
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1. , a kind of aqueous polyurethane dispersion, it comprises urethane solid and the content non-aqueous organic solvent less than 5 weight %, and wherein said urethane solid is obtained by polyurethane prepolymer by following substance reaction:

  • (a) polyvalent alcohol or polyvalent alcohol adulterant, its intermediate value average equivalent are 240 to 480;

    With(b) at least a polyisocyanates;

    (c) Ren Xuan other stablizer;

    With(d) Ren Xuan chain extension agent;

    The isocyanic ester of wherein said prepolymer (NCO) content is that the mol ratio of 8 to 13 weight % and polyisocyanates and polyvalent alcohol is 2.0;

    1 to 3.0;

    1;

    Condition is if less than 260, there is chain extension agent in the equivalent of polyvalent alcohol or polyvalent alcohol adulterant.

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