A method for preventing deposition of polymer scale and a coating agent therefor
申请人:Shin-Etsu Chemical Co., Ltd.
公开号:EP0126991A1
公开(公告)日:1984-12-05
The invention provides a method for preventing deposition of polymer scale on the reactor walls in the polymerization of an ethylenically unsaturated monomer, in particular, by emulsion polymerization. The method comprises coating the reactor walls with a coating composition containing, as the essential components, (A) an organic compound having at least 5 conjugated π bonds in a molecule, (B) a chelating agent and (C) a metal compound capable of producing metal ions having a coordination number of at leas 2 which presumably forms a metallic chelate compound with the chelating agent contributing to the formation of a strongly adsorbed layer on the reactor walls. The coating composition may be further admixed with a silicic acid compound such as a colloidal silica.
The invention relates to an outdoor cosmetic comprising kynurenine (derivative) as an effective ingredient and serving for retaining skin health under exposure to ultraviolet ray, not by inhibiting tyrosinase activity but by actively utilizing tyrosinase activity and allowing the intermediate products in the course of black melanin generation to react with kynurenine (derivative) to generate safe pigments in yellowish brown to red under inhibition of the generation of black melanin.