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Abrasive wheels

  • US 4,933,373 A
  • Filed: 04/06/1989
  • Issued: 06/12/1990
  • Est. Priority Date: 04/06/1989
  • Status: Expired due to Term
First Claim
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1. A molded abrasive article comprising:

  • (a) a smear-resistant, elastomeric, crosslinked polyurethane binder matrix comprised of the polymerization reaction product of a solvent-free polymerizable mixture comprising;

    (i) short-chain, active hydrogen functional monomer having an average active hydrogen functionality of from about 2 to 8 and an average molecular weight less than about 400,(ii) long-chain, active hydrogen functional, diene prepolymer having an average active hydrogen functionality of from about 2 to 4 and an average molecular weight from about 400 to 25,000,(iii) polyisocyanate having an average isocyanate functionality of from about 2 to 4, and(iv) crosslinking initiator which induces crosslinking between unsaturation sites on adjacent diene prepolymer residues, said reaction product having a glass transition temperature of at least about 10°

    C. and a glass transition temperature range of at least about 70°

    C. when cured; and

    (b) particles of abrasive material dispersed throughout and adhered within said polyurethane binder matrix.

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