Abstract 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-polymer) quantities of abrasive particles; particles of a strong, high thermal conductivity filler and solid lubricant particles. Grinding wheel composite structures produced from these molding compositions are particularly effective for dry grinding.
The molding composition of claim 1 having a small quantity of an organic peroxide included therewith.
Claim 2
Dependent Claim
18 words
The molding composition of claim 1 wherein the pre-polymer is the reaction product of N,N''-p,p''-diphenylmethane-bis-maleimide and p,p''-methylene dianiline.
Claim 3
Dependent Claim
30 words
The molding composition of claim 1 wherein the solid lubricant is molybdenum disulfide and the filler is silicon carbide of grain size passing through a 250 mesh screen (U.S. sieve).
Claim 4
Dependent Claim
20 words
The molding composition of claim 1 wherein the heat-cUrable pre-polymer is the reaction product of a bis-imide and a diamine.
Claim 5
Dependent Claim
18 words
The molding composition of claim 1 wherein the pre-polymer heat-curable organic composition is a mixture of imido monomers.
Claim 6
Dependent Claim
20 words
The molding composition of claim 1 wherein the pre-polymer is the reaction product of N-phenyl maleimide, N,N''-p,p''-diphenylmethane-bis-maleimide and p,p''-methylene dianiline.