申请人:The Nippon Synthetic Chemical Industry Co., Ltd.
公开号:EP2426172A1
公开(公告)日:2012-03-07
The present invention provides a polyvinyl alcohol-based resin (PVOH-based resin) composition having less coloration from melt processing and having high aging stability of the melt viscosity. The present invention relates to a polyvinyl alcohol-based resin composition comprising a polyvinyl alcohol-based rein having a structural unit represented by the following formula (1) and having an absorbance of 0.1 to 0.3 of 280 nm in an ultraviolet absorbance spectrum as a 4 mass% aqueous solution, a carboxylic acid and an alkaline (earth) metal salt, wherein when an aqueous solution of the polyvinyl alcohol-based resin composition is prepared so as to have a content of the polyvinyl alcohol-based resin of 4 mass%, the pH of the aqueous solution at 20°C is from 5.5 to 7:
[wherein R1, R2 and R3 independently represent a hydrogen atom or an organic group, X represents a single bond or a bonding chain, and R4, R5 and R6 independently represent a hydrogen atom or an organic group].
申请人:The Nippon Synthetic Chemical Industry Co., Ltd.
公开号:EP2426172B1
公开(公告)日:2014-05-14
POLYVINYL ALCOHOL-BASED RESIN COMPOSITION
申请人:Shibutani Mitsuo
公开号:US20120041118A1
公开(公告)日:2012-02-16
The present invention provides a polyvinyl alcohol-based resin (PVOH-based resin) composition having less coloration from melt processing and having high aging stability of the melt viscosity. The present invention relates to a polyvinyl alcohol-based resin composition comprising a polyvinyl alcohol-based rein having a structural unit represented by the following formula (1) and having an absorbance of 0.1 to 0.3 of 280 nm in an ultraviolet absorbance spectrum as a 4 mass % aqueous solution, a carboxylic acid and an alkaline (earth) metal salt, wherein when an aqueous solution of the polyvinyl alcohol-based resin composition is prepared so as to have a content of the polyvinyl alcohol-based resin of 4 mass %, the pH of the aqueous solution at 20° C. is from 5.5 to 7:
[wherein R
1
, R
2
and R
3
independently represent a hydrogen atom or an organic group, X represents a single bond or a bonding chain, and R
4
, R
5
and R
6
independently represent a hydrogen atom or an organic group].
US8722782B2
申请人:——
公开号:US8722782B2
公开(公告)日:2014-05-13
A simple, efficient and versatile synthesis of primary gem-dihydroperoxides from aldehydes and hydrogen peroxide
Aldehydes were efficiently converted directly into the corresponding gem-dihydroperoxides (DHPs) on treatment with aqueous 70% H2O2 in a biphasic system with ether catalyzed by camphorsulfonic acid. The synthesis represents the most versatile access to this class of compounds.
醛被有效直接转化为相应的宝石上治疗用含水70%H -dihydroperoxides吡啶类(DHP)2 Ô 2中的两相体系与由樟脑磺酸催化的醚。合成代表了此类化合物最通用的获取途径。