| 摘要 |
NEW MATERIAL:A polythiol expressed by the formula (X and Y are O or S; m and n are 1-3; p is 1 or 2). EXAMPLE:Diethylene glycol bis(2-mercaptoacetate). USE:Useful as a polymerization regulator, raw material for synthetic resins, crosslinking agent, vulcanizing agent, curing agent for epoxy resins, agent for forming metallic complexes, biochemical drug and additive for lubricating oils. Especially, sulfur-containing polyurethane resins obtained by thermally polymerizing a polyisocyanate, such as xylylene diisocyanate, isophorone diisocyanate or hexamethylene diisocyanate, have a high-degree refractive index and low decomposability and excellent other various physical properties and are useful as optical parts, etc. PREPARATION:A raw material alcohol or thiol is reacted with thioglycolic acid mercaptopropionic acid, etc., in the presence of, e.g. an acid catalyst, and the reaction solution is neutralized after the reaction to afford the aimed compound expressed by formula I. |
