| 摘要 |
There are disclosed urethane acrylates of Formula 1:
where R 1a , R 1b and R 1c each independently represent C 2-15 hydrocarbylene, preferably linear C 3-12 alkylene (such as , C 4-8 alkylene; e.g. hexylene); a isophorone unit and/or a tolyl unit. R 2a , R 2b and R 2c each independently represent: a divalent moiety of
(Formula 2) where X and Y independently represent C 2-10 hydrocarbylene, preferably C 2-8 alkylene; and k is from 0 to 30; l is from 0 to 30; and 'k + l' is from 1 to 30; and/or a divalent moiety of Formula 3
where V and W independently represent C 2-10 hydrocarbylene, preferably C 2-8 alkylene; and i is from 0 to 30; j is from 0 to 30; and 'i + j' is from 1 to 30; p is from 1 to 10; and r is from 1 to 10; and R 3a R 3b and R 3c each independently represent H or methyl (i.e. R 3 forms respectively part of an acrylate or a methacrylate group); with the provisos that at least one of R 2a , R 2b and R 2c is a moiety of Formula 2; at least one of R 2a , R 2b and R 2c is a moiety of Formula 3; and when R 2 represents a divalent moiety of Formula 3, the sub moiety
within Formula 3, is attached directly to the amide group in Formula 1. The UAs of Formula 1 are of non crystalline and of low viscosity and are suitable for preparing polymeric flexibilizers suitable for tenting applications. A process for preparing these urethane acrylate is also described. |
