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Polyurethane latexes, processes for preparing them and polymers prepared therewith

  • US 6,720,385 B2
  • Filed: 04/30/2002
  • Issued: 04/13/2004
  • Est. Priority Date: 03/17/1997
  • Status: Expired due to Fees
First Claim
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1. A process for preparing a stable polyurethane latex comprising admixing a polyurethane prepolymer with water, an anionic surfactant, and a chain extender in the absence of an organic solvent under conditions sufficient to disperse the prepolymer and chain extender reaction product to form a latex wherein:

  • (i) the prepolymer is prepared from a prepolymer formulation including an aromatic polyisocyanate component and polyol component, such that the NCO to OH ratio is about 3.2 to about 6.7 and the polyol component has a molecular weight from about 750 to about 8000, (ii) from 5 to 40 percent of the weight of the polyol component is ethylene oxide in the form of ethylene oxide applied as an end cap onto a propylene oxide or higher oxyalkylene polyoxyalkylene polyol, and (iii) no more than 45 percent of the weight of polyol component is ethylene oxide.

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