Asahi Kasei Kogyo Kabushiki Kaisha

Koichi Yasui

Kazuyoshi Imamura

Jinpei Hisano

Akeomi Saito

Isao Hirashita

Taketoshi Honma

Yoshio Nishi

Tokuzo Asakusa

Koichi Murayama

Coating of the surface of a pencil barrel with a coat film having a sufficient thickness and smoothness can be well achieved by using a hot-melt polyester as a coating material. The formation of the desired coat film on the pencil barrel can be attained even by only a single coating operation. The coat film of hot-melt polyester formed on the surface of the pencil barrel has an excellent affinity for and an improved adhesion to not only a pencil barrel but also to a lacquer if any lacquer is additionally coated on the polyester-coated pencil barrel. Any organic solvent need not be used, and the coating operation can be completed in an extremely short time. Therefore, the method of the present invention is very advantageous from the viewpoints of prevention of environmental pollution and enhancement of productivity.

Method of coating a pencil

A process for injection molding a polyester with improved crystallization thereof is described, which comprises incorporating, prior to molding, incorporating in the polyester as a crystallization accelerator a compound containing at least one aromatic ring selected from the group consisting of a benzene ring, a naphthalene ring and an anthracene ring; at least one sulfonic acid alkali metal salt group; and at least one phenolic hydroxy alkali metal salt group.

Process for injection molding a polyester with improved crystallization

Hydrogen sulfide-containing waste gases whose complete treatment is indispensable from the viewpoint of environmental pollution problem, are purified in two steps consisting of a first step in which the gases are absorbed in an aqueous solution of sodium hydroxide or/and sodium sulfide, and a second step in which sulfuric acid and sulfur dioxide gas are simultaneously introduced into the resulting solution after absorption to deposit sulfur. Further, for recovery of the resulting sulfur, a particular apparatus is provided.

Method for purifying hydrogen sulfide-containing gas

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Nobeoka, Japan

Koichi Yasui