申请人:Ciba-Geigy Corporation
公开号:US03954839A1
公开(公告)日:1976-05-04
The compounds are esters having the formula ##EQU1## wherein R.sub.1 and R.sub.2 are each independently alkyl, cycloalkyl, alkylthioethyl or alkylpolyoxyalkylene, Z is oxygen or sulfur, R.sub.3 is the group ##SPC1## R.sub.4 is hydrogen, alkyl, cycloalkyl or .alpha.-methylbenzyl, R.sub.5 is alkyl or cycloalkyl, R.sub.6 is hydrogen or alkyl and, provided when R.sub.4 is hydrogen, R.sub.6 is alkyl and R.sub.5 is located on the carbon atom ortho to the hydroxyl group, and A is a covalent carbon bond or lower alkylene. The esters of this invention are prepared by usual esterification procedures from a thioether isopropanol and an acid of formula ##SPC2## Or a derivative thereof, preferably the methyl ester. The thioether isopropanols are prepared by reaction of epichlorohydrin with an alcohol or mercaptan followed by the opening of the oxirane ring with a mercaptide to give the desired thioether isopropanol. The compounds are useful as stabilizers for organic materials, especially polyolefins, which degrade upon exposure to light and heat.
这些化合物是具有以下公式的酯类化合物:其中R.sub.1和R.sub.2各自独立地是烷基、环烷基、烷基硫乙基或烷基聚氧烷基,Z是氧或硫,R.sub.3是该基团,R.sub.4是氢、烷基、环烷基或α-甲基苄基,R.sub.5是烷基或环烷基,R.sub.6是氢或烷基,并且在R.sub.4为氢时,R.sub.6是烷基且R.sub.5位于对羟基的碳原子上,A是共价碳键或较低的烷基。本发明的酯类化合物通过常规的酯化程序从硫醚异丙醇和以下公式的酸制备而成:或其衍生物,最好是甲酯。硫醚异丙醇是通过环氧氯丙烷与醇或硫醇的反应制备的,随后通过与巯基盐酸盐的开环反应得到所需的硫醚异丙醇。这些化合物可用作有机材料的稳定剂,特别是对暴露于光和热的聚烯烃进行降解的情况。