0.3-5.0 parts by weight of phenol resin, sulfur, and vulcanizing accelerator are added to 100 parts by weight of EPDM rubber. They are kneaded, and the EPDM rubber is vulcanized and molded. Generation of blooming can be suppressed without inhibiting the vulcanizing speed and the vulcanizing start timing.

0.3-5.0 parts by weight of phenol resin, sulfur, and vulcanizing accelerator are added to 100 parts by weight of EPDM rubber. They are kneaded, and the EPDM rubber is vulcanized and molded. Generation of blooming can be suppressed without inhibiting the vulcanizing speed and the vulcanizing start timing.

A rubber composition containing (A) a sulfur cross-linkable rubber and (B) a conjugated diene-based rubber gel, having a toluene swelling index of 16 to 70, comprising 40 to 75% by weight of conjugated diene monomer units and 60 to 25% by weight of aromatic vinyl monomer units.

0.3-5.0 parts by weight of phenol resin, sulfur, and vulcanizing accelerator are added to 100 parts by weight of EPDM rubber. They are kneaded, and the EPDM rubber is vulcanized and molded. Generation of blooming can be suppressed without inhibiting the vulcanizing speed and the vulcanizing start timing.

A rubber laminate in which a rubber layer (1) containing the following rubber composition (A) is adhered by vulcanization to a rubber layer (2) containing another rubber composition (B). Rubber composition (A): Composition comprising 100 parts by weight of a mixture and 0.1 to 15 parts by weight of a peroxide crosslinking agent admixed therewith, the mixture comprising 5 to 95 wt. % of a peroxide-crosslinkable fluororubber containing vinylidene fluoride copolymerized therein in a proportion of 4...

A rubber additive is provided, which comprises crosslinked fatty acid and starch, and preferably further comprises a carrier, preferably an asphalt carrier. The rubber additive increases tear resistance when added to a rubber compound.

A rubber composition for sponge rubber which contains following components (A).about.(E) and satisfies the following requirements that the ratio by weight of (A)/(B) is 30/70.about.99/1 and the amount of component (C) is 50.about.400 parts by weight per 100 parts by weight of the total amount of components (A) and (B): (A): Epoxy group-containing acryl elastomer. (B): Ethylene copolymer which contains a carboxyl group(s) or a carboxylic anhydride group(s). (C): Hydroxyl compound of II or III gro...

As a rubber composition having an elasticity further increased as compared with the conventional rubber composition while preventing the lowering of the fracture resistance, there is provided a rubber composition comprising a rubber component of at least one of natural rubber and synthetic diene rubbers and a phenolic resin compounded therein and represented by the following formula (I): ##STR00001## (wherein R.sup.0 is a hydrogen atom, an alkyl group, a phenyl group or a methylol group, and eac...

The invention is directed to rubber mixtures comprising rubber, fillers, optionally further rubber auxiliaries and at least one organosilane of the general formula I: R.sup.1R.sup.2R.sup.3SiR.sup.4--SH (I) wherein: R.sup.1 is methyl or ethyl, R.sup.2 is methoxy, ethoxy or --O--(Y--O).sub.m--X where Y=a branched or unbranched, saturated or unsaturated divalent hydrocarbon group, X is a C1- to C9-alkyl group and m=1-40, R.sup.3 is methyl, ethyl or R.sup.2, and R.sup.4 is a branched or unbranched, ...

A rubber composition obtained by blending, into 100 parts by weight of a rubber, 10 to 100 parts by weight of carbon black surface-treated with a silane compound having an amino group (or groups), wherein at least 0.1 part by weight of the rubber ingredient is modified with maleic anhydride, whereby the heat buildup resistance and abrasion resistance of the rubber composition are enhanced and the scorch resistance is improved.