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US 5,669,941 AGranted
Coated abrasive article
AssigneeMinnesota Mining and Manufacturing Company
InventorLarry L. Peterson
Life of this patent
Estimating the term…
Abstract
The present invention provides a coated abrasive article, wherein the backing includes a tough, heat resistant, thermoplastic binder material, and an effective amount of a fibrous reinforcing material distributed throughout the thermoplastic binder material. The abrasive grain adhered to the backing comprise rare earth oxide-modified alpha alumina-based abrasive grain, which exhibit a surprising improvement in grinding performance in conjunction with the backing.
Claims26
A coated abrasive article comprising:
- (a) a reinforced thermoplastic backing having a front and a back surface, wherein said backing comprises:
- (i) a tough, heat resistant, thermoplastic binder material;
- and
- (ii) a fibrous reinforcing material distributed throughout said tough, heat resistant, thermoplastic binder material;
- (b) a binder adhesive;
- and
- (c) rare earth oxide-modified alpha alumina-based abrasive grain bonded to said front surface of said backing by said binder adhesive;
- wherein said rare earth oxide-modified alpha alumina-based abrasive grain comprise:
- (i) about 70-99.9% by weight alumina based on the total weight of the abrasive grain, wherein at least about 35% by weight of said alumina is present as alpha alumina;
- (ii) about 0.1-30% by weight rare earth oxide selected from the group consisting of praseodymium oxide, samarium oxide, ytterbium oxide, neodymium oxide, europium oxide, lanthanum oxide, gadolinium oxide, cerium oxide, dysprosium oxide, erbium oxide and mixtures of two or more thereof, based on the total weight of the abrasive grain;
- wherein said coated abrasive article, when used to abrade 1018 mild steel using a hydraulic slide action test, exhibits a grinding performance at least about 20% greater than a coated abrasive article having an iron oxide-nucleated alpha alumina-based ceramic abrasive grain, said binder adhesive, and a vulcanized fiber backing.
8 more elements
A coated abrasive article comprising:
- (a) a reinforced thermoplastic backing having a front and a back surface, wherein said backing comprises:
- (i) 60-99 wt-% of a tough, heat resistant, thermoplastic binder material;
- (ii) a fibrous reinforcing material distributed throughout said tough, heat resistant, thermoplastic binder material;
- and
- (iii) a toughening agent;
- (b) a binder adhesive comprising a resole phenolic resin and particulate material;
- and
- (c) rare earth oxide-modified alpha alumina-based abrasive grain bonded to said front surface of said backing by said resole phenolic binder adhesive;
- wherein said rare earth oxide-modified alpha alumina-based abrasive grain comprise:
- (i) about 70-99.9% by weight alumina, based on the total weight of the abrasive grain, wherein at least about 35% by weight of said alumina is present as alpha alumina;
- (ii) about 0.1-30% by weight rare earth oxide selected from the group consisting of praseodymium oxide, samarium oxide, ytterbium oxide, neodymium oxide, europium oxide, lanthanum oxide, gadolinium oxide, cerium oxide, dysprosium oxide, erbium oxide and mixtures of two or more thereof, based on the total weight of the abrasive grain;
- wherein said coated abrasive article, when used to abrade 1018 mild steel using a hydraulic slide action test, exhibits a grinding performance at least about 50% greater than a coated abrasive article having an iron oxide-nucleated alpha alumina-based ceramic abrasive grain, said binder adhesive, and a vulcanized fiber backing.
9 more elements
A coated abrasive article comprising:
- (a) a reinforced thermoplastic backing having a front and a back surface, wherein said backing comprises:
- (i) a tough, heat resistant, thermoplastic binder material;
- (ii) a fibrous reinforcing material distributed throughout said tough, heat resistant, thermoplastic binder material;
- and
- (iii) a toughening agent;
- (b) a binder adhesive comprising a resole phenolic resin and particulate material;
- and
- (c) rare earth oxide-modified alpha alumina-based abrasive grain bonded to said front surface of said backing by said binder adhesive;
- wherein said rare earth oxide-modified alpha alumina-based abrasive grain comprises, about 1.2% Y.sub.2 O.sub.3, about 1.2% Nd.sub.2 O.sub.3, about 1.2% La.sub.2 O.sub.3, about 1.2% MgO, and about 95.2% Al.sub.2 O.sub.3, based on the total weight of the abrasive grain.
6 more elements
Dependencies are inferred from the claim text.