| 摘要 |
1523205 Unsaturated polyester varnish preparation RHONE-POULENC INDUSTRIES 8 April 1976 [10 April 1975] 14435/76 Heading C3P A method of preparing a polymerizable unsaturated polyester mixture, in which the undesirable green colouration on subsequent polymerization, and attributable to the cobalt drier component, is eliminated, comprises (A) polycondensing at least one diol and at least one unsaturated polycarboxylic acid or anhydride in the presence of magnesium or a magnesium compound capable of forming a reducing agent in situ during the course of the polycondensation, (B) dissolving the polycondensate formed in an ethylenic monomer containing at least one inhibitor and (C) adding a cobalt compound. The usual peroxide and hydroperoxide polymerization initiators may be included for polymerizing the resulting varnish. |
