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Production of polyurethane embedding materials and use thereof

  • US 4,359,359 A
  • Filed: 01/05/1981
  • Issued: 11/16/1982
  • Est. Priority Date: 03/25/1978
  • Status: Expired due to Term
First Claim
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1. A process for the production of a polyurethane embedding material which comprises reacting an aromatic diisocyanate in stoichiometric excess with a mixture consisting essentially of castor oil and trimethylolpropane to form a flowable preadduct containing unreacted isocyanate groups and subsequently hardening said preadduct by intimately admixing therewith as a cross-linking agent(a) castor oil, or(b) a mixture of castor oil and trimethylolpropane in an amount sufficient to cross-link the prepolymer through a majority of its unreacted isocyanate groups.

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