Elastomeric sealants
AssigneeMinnesota Mining and Manufacturing Company
InventorThomas S. Croft
Life of this patent
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Abstract
An elastomer composition, resistant to hydrocarbon fluid and water absorption, comprising a) an isocyanate reactive component comprising a polypropylene ether polyol containing from about 5 percent to about 60 percent of a dispersion comprising a condensation or addition polymer, b) from about 5 percent to about 35 percent of an epoxy resin, and c) a polyurethane formed from said polypropylene ether polyol, having active hydrogen atoms and at least one isocyanate component in the presence of said dispersion and said epoxy resin, said polyurethane having an isocyanate index of less than 100, said elastomer composition exhibiting less than about 20 percent weight gain after being immersed in kerosene for 24 hours at 38.degree. C.
Claims29
An elastomer composition, resistant to hydrocarbon fluid and water absorption, comprising
- a) an isocyanate reactive component comprising a polypropylene ether polyol containing from about 5 to about 60 percent by weight dispersed polymer particles comprising a condensation or addition polymer,
- b) from about 5 to about 35 percent by weight of a liquid epoxy polymer containing more than one .alpha.-epoxy group, and
- c) a polyurethane formed from said polypropylene ether polyol, having active hydrogen atoms and at least one isocyanate component in the presence of said dispersed polymer particles and said liquid epoxy polymer,
- said polyurethane having an isocyanate index of less than 100, said elastomer exhibiting less than about 20 percent weight gain after being immersed in kerosene for 24 hours at 38.degree. C., said elastomer exhibiting substantially no syneresis after 18 hours in a 104.degree. C. oven.
Dependencies are inferred from the claim text.