According to the invention, the composition contains an abrasive material (12.5-37.5 vol.-%), a metallic filler (30-60 vol.-%), a mineral binder (5-30 vol.-%) and the balance is an organic binder. The mineral binder is constituted by at least one substance from a group of salts whose melting temperature corresponds to the temperature range of polymerization of the organic binder.

By fluorinating diamond grit, the grit may be readily bonded into a fluorocarbon resin matrix. The matrix is formed by simple hot pressing techniques. Diamond grinding wheels may advantageously be manufactured using such a matrix. Teflon fluorocarbon resins are particularly well suited for using in forming the matrix.

An extensible and contractable bellows adapted to be mounted about a shaft. The bellows includes a hollow body portion that is substantially cylindrical and unstressed when extended, and also includes a plurality of internal ribs adapted to engage the shaft and form lubricating chambers therebetween. The chambers are filled with a suitable fluid such as oil or air, for lubricating the shaft. A plurality of notched passageways or nibs, formed with the ribs, permits and controls flow of the lubric...

Uncured molded abrasive articles having low volatile organic chemical content are prepared using water as a temporary binder. The abrasive articles preferably contain a uniformly coated abrasive grain comprising a novolac resin having a phenol:formaldehyde ratio of 1:0.2 to 1:0.35 and containing less than 0.5% free phenol.

An acrylonitrile-butadiene-styrene terpolymer is added to a phenol formaldehyde novolak to form a grinding wheel binder imparting increased flexural strength to the grinding wheel.

Abrasives based on finely divided abrasive particles bonded to one another and/or to a support by means of a binder, where the binder is the solid component of an aqueous polymer dispersion which is obtainable by polymerizing unsaturated monomers which can be polymerized by means of free radicals, in the aqueous phase in the presence of a monosaccharide, oligosaccharide, polysaccharide, oxidatively, hydrolytically and/or enzymatically degraded polysaccharide, chemically modified monosaccharide, ...

A molding composition for the manufacture of resinoid bonded abrasive structures is described. Each molding composition employs a high temperature thermosetting pre-polymer (or mixture of organic materials) containing aliphatically unsaturated imido radicals, which cures with essentially no evolution of volatiles to produce polyimide resin cross-linked with carbon-to-carbon and/or carbon-to-nitrogen bonds. The preferred molding composition embodies (in addition to the aforementioned type of pre-...

A method for producing an abrasive tool or structure which includes the steps of mixing an abrasive composition containing abrasive particles and, preferably, friable particles, with a liquid, multi-stage, thermosetting resin and coating substantially all of the individual particles with the resin; curing the resin to the B-stage while the resin is in contact with the particles to form a fusible solid coating on the particles and forming individual particles coated with said B-stage resin, and p...

The use of tiny diamonds for finish polishing of glass lenses has been made possible by incorporating them into a lap material comprising very small diamonds in a special polymeric matrix of the reaction product of an organic epoxide with an appropriate "hardener," such as a polyamine.

A process for the manufacture of a resin-bound abrasive grinder having superior strength, grinding performance and wear resistance, which comprises heating a synthetic resin or dissolving it in a suitable solvent to liquidize it, adding at least one inorganic filler to the liquidized resin to thoroughly wet the filler therewith and bind same together thereby forming a binding composition, incorporating the binding composition with an abrasive material and then pressure forming the resultant mixt...