Abstract: A thermal resistance resin dust obtained by a process which comprisesa step of preparing a composition comprising(I) an aromatic hydrocarbon-formaldehyde resin-modified novolak type epoxy resin and(II) a cyanate ester resin composition comprising (a) polyfunctional cyanate esters, prepolymers of said cyanate ester, or prepolymers of said cyanate ester and an amine; or (a) in combination with (b) a monofunctional or polyfunctional maleimide, a prepolymer of said maleimide or a prepolymer of said maleimide and an amine, andoptionally (III) an inorganic filler with cleavage property,a step of curing the composition at a final curing temperature of not less than 200.degree. C. anda step of grinding the cured product, is disclosed.

Abstract: A friction material for a brake obtained by a process which comprisespreparing (I) a composition for a friction material from (A) a binder composition comprising 95-5 parts by weight of a cyanate ester resin and 5-95 parts by weight of a polycyclic aromatic pitch, (B) a fiber reinforcing substrate, and (C) a friction and wear regulator,thermoforming the composition (I) by hot pressing to cure the binder composition (A), andheat-treating the cured product at a temperature of 270.degree.-800.degree. C. to cyclize or semi-carbonize the binder composition (A) is disclosed which has markedly improved anti-fade properties.

Abstract: An asbestos-free disc brake pad is provided by employing a cyanate ester-based resin composition as binder. The disc brake pad exhibits consistent braking properties over a wide range of operating temperatures and an improved service life. Also the serious pollution problem due to use of asbestos in the conventional brake pads is removed.

Abstract: A novel cyanic acid ester of an aromatic polycarbonate can be prepared by reacting an aromatic polycarbonate having one or two terminal hydroxyl groups with a cyanogen halide in an inert solvent at a temperature of -30.degree. to +65.degree. C in the presence of a base. Said cyanic acid ester and an admixture of said cyanic acid ester with other known cyanic acid ester, both of which may or may not contain a catalyst and/or other polymers are available for a coating material, a casting material, an adhesive or a molding material. When said cyanic acid ester or said admixture is cured, there is obtained a laminate, a film or a molded article. The cured products are rich in flexibility.

Abstract: A phenolic resin composition for manufacturing laminates which comprises a modified phenolic resin having incorporated therewith 1-40% by weight of polycarbonate resin. The phenolic resin composition gives laminates with improved mechanical strength and workability without causing any lowering of surface hardness.