Title:
劣化評価方法
Document Type and Number:
Japanese Patent JP5406069
Kind Code:
B2
Abstract:
The present invention provides a method for evaluating deterioration of a resin formed object. The method comprises analyzing the deterioration reason of the resin formed object which is obtained through forming of the resin composition that comprises polyacetal copolymer because of dipping into hydrocarbon liquids, and slight deteriration at an early period of deterioration can be evulated. Through respectively performing 1H-NMR measurement for a plurality of resin compositions which comprise the polyacetal copolymer and are dipped into the hydrocarbon liquids for different time lengths, molecular weight variation of the polyacetal copolymer is evaluated according to the total area of the peaks with peak crests in 8.04ppm to 8.07ppm in the respective measurement result, thereby evaluating the deterioration of the resin composition.
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Inventors:
Yukihiko Kageyama
Toshihiro Kobashi
Hatsuhiko Harashina
Toshihiro Kobashi
Hatsuhiko Harashina
Application Number:
JP2010028861A
Publication Date:
February 05, 2014
Filing Date:
February 12, 2010
Export Citation:
Assignee:
Polyplastics Co., Ltd.
International Classes:
G01N24/08; C08G2/00; C08L59/02
Domestic Patent References:
| JP2007534787A |
Other References:
和田 徹, 八尋 修二, 田村 亘弘,「ポリアセタール樹脂のNMRによる解析」,高分子学会予稿集,社団法人高分子学会,1992年 9月10日,Vol. 41, No. 10,p. 4310-4312
TOSHIO OGAWA, WATARU ISHITOBI, KAZUYA JINTA,"Proton-NMR studies of polyacetal copolymers",Journal of Applied Polymer Science,米国,John Wiley & Sons, Inc.,1989年 7月 5日,Vol. 38, No. 1,p. 87-94
TOSHIO OGAWA, WATARU ISHITOBI, KAZUYA JINTA,"Proton-NMR studies of polyacetal copolymers",Journal of Applied Polymer Science,米国,John Wiley & Sons, Inc.,1989年 7月 5日,Vol. 38, No. 1,p. 87-94
Attorney, Agent or Firm:
Masayuki Masabayashi
Hayashi Ichiyoshi
Hayashi Ichiyoshi