Sumitomo Chemical Company, Limited

Hideyuki Kuribayashi

Yoshihiko Kitagawa

Ken-Ichi Kudo

Takashi Sanada

Taichi Nishio

Hideo Shinonaga

Toshiki Doi

Ken-ichi Kudo

Seiko Miura

Tatsuya Koizumi

The present process for producing aromatic polyamide fibers for reinforcement of rubbers lies in that, in the first step, the fibers are dipped in an epoxy treating solution containing aromatic glycidylamines having 2 or more epoxy groups in one molecule and aromatic amines at a specific ratio and dried and cured, and thereafter, in the second step, the fibers are dipped in a treating solution for the second step containing resorcin formaldehyde resins and rubber latices and dried and cured. More preferably, specific chlorophenol compounds are added to the treating solution for the second step. The aromatic polyamide fibers obtained by the process of the present invention provide rubber products excellent in water resistance when they are used for reinforcement of rubbers, and the products have high adhesive strength in initial adhesion and besides, small decrease in adhesive strength even if they are dipped in water for a long time.

Polyamide fibers

A novel thermoplastic resin composition excellent in heat resistance, impact resistance, hardness is provided which comprises 100 parts by weight of a composition comprising (A) 5-95% by weight of a polyphenylene ether prepared by oxidation polymerization of at least one phenol compound represented by the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 which may be identical or different and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted hydrocarbon residue, with a proviso that at least one of them is a hydrogen atom and (B) 95-5% by weight of a polyamide and 5-100 parts by weight of (C) a copolymer of an ethylene-.alpha.-olefin copolymer rubber with an alkenyl aromatic compound and an unsaturated carboxylic acid or its anhydride. This composition may further contain 0.01-30 parts by weight of an epoxy compound (D) for 100 parts by weight of the composition of (A) and (B).

Thermoplastic resin composition

A polyolefin composition and a molded article obtained therefrom are disclosed. The composition comprises a polyolefin and a modified polymer obtained by graft-copolymerizing an unsaturated dicarboxylic acid or an anhydride thereof to a specific ethylene-propylene-based copolymer rubber. The molded article obtained from the composition has an increased impact strength and improved workability in finishing, particularly coating with an urethane coating.

Polyolefin composition and molded article obtained therefrom

In the production of petroleum resins by polymerizing an unsaturated hydrocarbon-containing fraction having a boiling point ranging from -20.degree. to 200.degree. C. at -50.degree. to 100.degree. C., an improvement for producing light-colored clear petroleum resins which comprises using an aluminum chloride/fatty acid ester/aromatic hydrocarbon complex solution.

Process for producing light-colored clear petroleum resins

A petroleum resin produced by copolymerizing a monomer composition comprising (1) a mixture of 20 to 80 parts by weight of a so-called spent C.sub.4 - or C.sub.5 -fraction obtained by removing most of the dienic constituents from a fraction mainly of four or five carbon atoms formed in petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative, and (2) 0.5 to 10 parts by weight of divinylbenzene for 100 parts by weight of the monomeric constituents contained in said mixture (1), with a catalyst system comprising an organoaluminum compound represented by the general formula AlR.sub.n X.sub.3.sub.-n (wherein R is an alkyl group having 1 to 4 carbon atoms, X is a halogen atom, and n is a positive number from 1 to 2) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst in a hydrocarbon solvent at a temperature of 0.degree. to 60.degree. C.

Novel petroleum resin formed by a catalyst system containing (a)

A novel petroleum resin having not only a relatively low molecular weight but a narrow molecular weight distribution and having excellent characteristics as a tackifier particularly suitable for use in hot-melt adhesives and also suitable for synthetic rubbers, adhesive tapes, sealants, and the like, which resin is obtained by copolymerizing 20 to 80 parts by weight of a so-called spent C.sub.4 - or C.sub.5 -fraction obtained by removing most of the dienic constituents from the fractions mainly of C.sub.4 or C.sub.5 carbon atoms produced by petroleum cracking and 80 to 20 parts by weight of styrene and/or a styrene derivative with a catalyst system comprising an organoaluminum compound represented by the general formula AlRX.sub.2 (wherein R is an alkyl group having 1 to 4 carbon atoms and X is a halogen atom) as main catalyst and an alkyl halide or a hydrogen halide as co-catalyst, in a hydrocarbon solvent at a temperature of 0.degree. to 60.degree. C.

Process for preparing novel petroleum resin employing AlRX.sub.2 and

A process for producing a petroleum resin which comprises polymerizing in the presence of a Friedel-Crafts catalyst a C.sub.5 -fraction from cracked naphtha or oil gas, which has been subjected to an adjustment of a weight ratio of acyclic diolefins to monoolefins and a weight ratio of cyclic diolefins to monoolefins to from 0.40 to 0.70 and from 0.07 to 0.35, respectively.

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Chiba, Japan

Hideyuki Kuribayashi