| abstract |
PCT No. PCT/EP92/00667 Sec. 371 Date Nov. 25, 1992 Sec. 102(e) Date Nov. 25, 1992 PCT Filed Mar. 26, 1992 PCT Pub. No. WO92/17520 PCT Pub. Date Oct. 15, 1992.A process for the solid state polyaddition of a polyester resin in which the resin, blended in a molten state with a dianhydride of an aromatic tetracarboxylic acid is granulated, crystallized and then upgraded, characterized in that the crystallization and upgrading temperature is comprised in the range between the TG and 170 DEG C., preferably between 130 DEG and 170 DEG C. |