abstract |
(57) Summary [Objective] An object of the present invention is to provide a novel compound that reduces the concentration of terminal carboxyl groups in a polyester. [Constitution] The following formula (I) [Here, R 1 is an alkyl group having 1 to 16 carbon atoms. R 2 , R 3 , R 4 and R 5 are the same or different and each is an alkyl group having 1 to 7 carbon atoms. R 6 , R 7 , R 8 , R 9 , R 10 and R 11 are the same or different and have 1 to 16 carbon atoms. Represents an alkyl group or a hydrogen atom. ] The isourea derivative represented by these. |