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High impact poly(urethane urea) polysulfides

  • US 20100048852A1
  • Filed: 11/02/2009
  • Published: 02/25/2010
  • Est. Priority Date: 11/16/2001
  • Status: Abandoned Application
First Claim
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1. A sulfur-containing polyureaurethane having a refractive index of at least 1.57, an Abbe number of at least 32 and a density of less than 1.3 grams/cm3 when cured, wherein the sulfur-containing polyureaurethane is prepared by the reaction of:

  • (a) a sulfur-containing, isocyanate functional polyurethane prepolymer derived from;

    (i) a polyisocyanate; and

    (ii) a polythiol oligomer produced by the reaction of at least two or more different dienes with one or more dithiols; and

    (b) an amine-containing curing agent.

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