Abrasive wheels
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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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° C. and a glass transition temperature range of greater than about 70° C.
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Citations
21 Claims
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1. A molded abrasive article comprising:
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(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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification