Process for the manufacture of glycidylester compositions
View Patent ↗A process for the manufacture of glycidylester compositions by (a) reacting: (i) at least one cyclohexyl anhydride compound A; (ii) at least one di-secondary or di-primary hydroxyl compound B containing two (cyclo)aliphatic hydroxyl groups; (iii), at least one di-secondary carboxylic acid or anhydride compound C; and (iv) a mono-glycidyl ester of an α,α-branched carboxylic acid compound D containing from 5 to 19 carbon atoms; and (b) reacting the carboxyl functional polyester from step (a) with an excess epihalohydrin in the presence of a base.
1. A process for the manufacture of glycidylester compositions having a hydrolyzable chlorine content of at most 6000 mg/kg, and an epoxy group content above 90% of the theoretical value comprising the steps of:
(a) reacting (i) at least one compound A, comprising an anhydride having the formula
wherein R and R′ each independently represents hydrogen or an alkyl group having from 1 to 4 carbon atoms connected to the cyclohexane ring or together forms a cyclohexane ring, or a diacid containing one secondary and one tertiary acid group;
(ii) at least one compound B comprising a di-primary or di-secondary hydroxyl compound containing two aliphatic or cycloaliphatic hydroxyl groups and at least three carbon atoms between the two hydroxyl groups, wherein the oxygen content is at most 35 wt % and there are no beta-hydrogen atoms;
(iii) at least one compound C, comprising a di-secondary carboxylic acid or anhydride; and
(iv) a monoepoxide D, wherein monoepoxide D is a mono-glycidyl ester of an alpha-alpha-branched carboxylic acid containing from 5 to 19 carbon atoms;
at a molar ratio of the components A:B:C of 2:X:Y, and Y ranges from greater than 0 to 3, wherein X is Y+1, at a temperature effective to react essentially all the hydroxyl groups as initially present and formed in the reaction mixture, thereby producing a carboxyl functional polyester having an acid value of less than 280 mgKOH/gram of polyester and containing substantially no diacid monomers having acid value of greater than 280 mgKOH/gram of polyester; and
(b) reacting said carboxyl functional polyester from step (a) with an excess of epihalohydrin in the presence of a base and optionally a catalyst, at a temperature effective to react essentially all the carboxylic acid groups initially present in the reaction mixture, thereby producing the glycidylester composition.
2. The process of claim 1 wherein the carboxyl functional polyester has an acid value in the range of 150 mgKOH/gram of polyester to 280 mgKOH/gram of polyester.
3. The process of claim 1 wherein compound B is hydrogenated diphenololpropane.
4. The process of claim 1 wherein the reaction in step (a) is carried out at a temperature in the range of 100 to 200° C.
5. The process of claim 1 wherein the reaction in step (b) is carried out at a temperature in the range of 20 to 125° C.