Sumitomo Chemical Company, Limited

Iko Ito

Tsutomu Takahashi

Yoshiki Toyoshima

Noriaki Saito

Hisao Takagishi

Shozaburo Imai

Michihisa Isobe

A process of producing glycidyl ethers of monohydric or polyhydric phenols is disclosed, which comprises mixing a monohydric or polyhydric phenol, dioxane or diethoxyethane, and epichlorohydrin; adding to the mixture an aqueous solution of an alkali metal hydroxide and subjecting to azeotropic distillation water, dioxane or diethoxyethane, and epichlorohydrin, followed by liquefaction of the distillate to be divided into an aqueous layer and an organic layer, and circulating the organic layer to the mixture whereas eliminating the aqueous layer. According to this process, the content of hydrolyzable chlorine which cannot be removed in a subsequent purification step is minimized and the phenol glycidyl ethers thus obtained are well suited for the use of sealing materials for integrated circuits.

Process of producing glycidyl ethers of monohydric or polyhydric phenols

Optical resin material having improved birefringence

A new glycidyl ether of novolak type substituted phenolic resin composed of specific repeating units and new terminal groups contained therein. This resin is superior as an encapsulating compound in the electric and electronic industries.

Glycidyl ether of novolak type substituted phenolic resin, process for

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Ehime, Japan

Iko Ito