Shinya Tanaka
Sumitomo Chemical
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Publication
Featured researches published by Shinya Tanaka.
Polymer Degradation and Stability | 1993
Shinichi Yachigo; Kanako Ida; Manji Sasaki; Kikumitsu Inoue; Shinya Tanaka
Abstract 2- tert -Butyl-6-(3- tert -butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (GM, Sumilizer® GM) is known as an effective thermal stabilizer which protects polymers against thermal degradation caused by heat or mechanical stress especially under oxygen-deficient atmosphere. Its unique bifunctional stabilizing mechanism has been reported recently. 1 Further studies on the influences of structural factors of related phenols on oxidative discoloration and thermal stability of polymers has shown that 2-(1-(2-hydroxy-3,5-di- tert -pentylphenyl)ethyl)-4,6-di- tert -pentylphenyl acrylate (GS, Sumilizer® GS) not only has a more effective thermal stabilizing effect than GM but also has much higher resistance to oxidative discoloration.
Polymer Degradation and Stability | 1992
Shinichi Yachigo; Fumitoshi Kojima; Manji Sasaki; Kanako Ida; Shinya Tanaka; Kikumitsu Inoue
By a model accelerated oxidative reaction and product analysis, 2-tert-butyl-6-(3-tert-butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (Sumilizer® GM) was found to give a stilbene quinone-type colored product through a quinone methide-type intermediate. The resistance of GM and its analogs against oxidative discoloration was remarkably improved by substitution with a bulky group at the para position to the phenolic OH group.
Polymer Degradation and Stability | 1993
Shinichi Yachigo; Manji Sasaki; Kanako Ida; Kikumitsu Inoue; Shinya Tanaka; Honda Yoshiaki; Fukuyo Emiko; Yanagi Kazunori
Abstract 2- tert -Butyl-6-(3- tert -butyl-2-hydroxy-5-methylbenzyl)-4-methylphenyl acrylate (GM, Sumilizer® GM) is known as an effective thermal stabilizer for butadiene type polymers especially under an oxygen-free atmosphere. Further studies on this range of thermal stabilizers has recently shown that 2-(1-(2-hydroxy-3,5-di- tert -pentylphenyl)ethyl)-4,6-di- tert -pentylphenyl acrylate (GS, Sumilizer® GS) is a more effective thermal stabilizer and has resistance to discoloration. In this study, the molecular structures of GM, GS and some of their substituted analogs were determined by X-ray crystallography, and were found to be very similar to each other except for the conformation of the acrylate group. These compounds were found to have an intramolecular hydrogen bonding between the phenolic hydroxyl group and the oxygen atom of the acrylate carbonyl group. IR spectra at various temperatures showed that the performance of the bisphenol monoacrylate type compounds was correlated with the strength of the intramolecular hydrogen bonding. The substitution on the bridged methylene group may restrict the bond rotation and stabilize the molecular conformation which can form the intramolecular hydrogen bonding at high temperatures. This will result in a more effective hydrogen transfer from the phenolic OH groups to enolate radical inducing improved performance in the stabilizing mechanism.
Polymer Degradation and Stability | 1992
Shinichi Yachigo; Manji Sasaki; Tamaki Ishii; Shinya Tanaka
Abstract 3,9-Bis(2-(3-(3- tert -butyl-4-hydroxy-5-methylphenyl)propionyloxy)-1, 1-dimethylethyl)-2,4,8,10-tetraoxaspiro[5·5]undecane (Sumitomos new antioxidant: Sumilizer® GA-80) was shown to have extremely high discoloration resistance against nitrogen dioxide. This might be due not to the inertness of GA-80 to nitrogen dioxide but to the fact that the GA-80 structure allows an energy favorable reaction pathway to give stable colorless products. This proposition was supported by product analyses and computer calculation of molecular orbitals.
Archive | 2007
Keiji Fukushima; Yoshitaka Takezawa; Shinya Tanaka; 慎哉 田中; 啓二 福島; 由高 竹澤
Archive | 1988
Manji Sasaki; Shinichi Yachigo; Kikumitsu Inoue; Shinya Tanaka; Takeshi Takata
Archive | 2010
Hiroyuki Kosho; Shinya Tanaka; Chikao Tsuchiya; 裕之 古性; 千加夫 土谷; 慎也 田中
Archive | 2005
Shinya Tanaka; Yoshitaka Takezawa; Hiroyuki Takahashi
Archive | 2004
Shinya Tanaka; Yoshitaka Takezawa; Hiroyuki Takahashi
Archive | 2011
Chikao Tsuchiya; Hiroyuki Furushou; Shinya Tanaka