| 摘要 |
1474677 Hydroxybenzoic acid esters ASAHI KASEI KOGYO KK 16 June 1975 [18 June 1974 23 July 1974 5 Aug 1974] 25593/75 Heading C2C [Also in Division C3] Compounds, useful as curing agents for epoxy resins have one of the following general formulµ R 3 is a C 2-10 (cyclo)alkylene or polyoxyalkylene radical and R 4 is a C 2-10 (cyclo)alkylene orarylene radical. R 5 is a C 1-20 alkylene radical and n#1. R 8 is a C 1-10 alkylene or arylene radical and R 9 is a C 1-20 (cyclo)alkylene or arylene radical. In an example p-hydroxybenzoic acid is reacted with ethylene glycol in the presence of catalysts and the product reacted with succinic acid to yield Other examples relate to the preparation of by analogous methods. A compound of Formula II is prepared from 1 mole of phydroxybenzoic acid and 2 moles of #-caprolactone. |
