초록 ▼

A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic akylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol, and (ii) optionally adding thereto a further amount of cyclic alkylene carbonate in the presen

A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic akylene carbonate in the presence of a first catalyst to thereby form a polyalkoxy diol, and (ii) optionally adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.

대표청구항 ▼

[ What is claimed is:] [1.] A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst of an alkali carbonate to thereby form a polyalkoxy diol, and (ii) adding thereto a further amount o

[ What is claimed is:] [1.] A process for the preparation of an unsaturated polyester which comprises (i) reacting an organic diol with a cyclic alkylene carbonate in the presence of a first catalyst of an alkali carbonate to thereby form a polyalkoxy diol, and (ii) adding thereto a further amount of cyclic alkylene carbonate in the presence of a second catalyst of an alkali alkoxide, and (iii) subsequently polycondensing the resulting mixture with a dicarboxylic acid.