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US 4,933,373 AGranted
Abrasive wheels
AssigneeMinnesota Mining and Manufacturing Company
InventorLouis S. Moren
Life of this patent
Estimating the term…
Abstract
A molded abrasive article comprising abrasive particles dispersed throughout and adhered within a crosslinked polyurethane binder matrix having a glass transition temperature greater than about 10.degree. C. and a glass transition temperature range of greater than about 70.degree. C.
Claims21
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.degree. C. and a glass transition temperature range of at least about 70.degree. C. when cured;
- and
- (b) particles of abrasive material dispersed throughout and adhered within said polyurethane binder matrix.
5 more elements
Dependencies are inferred from the claim text.