Process for preparing soft transparent polyesters

Details Process for preparing soft transparent polyesters Process for preparing soft transparent polyesters

C - Chemistry, Metallurgy

08

G

400/2015

C08G 63/66 (2006.01) C08G 63/672 (2006.01) C08L 67/02 (2006.01) C08L 71/02 (2006.01)

Patent

CA 1061040

Abstract of the Disclosure Soft polyesters having improved transparency are prepared by reacting (a) terephthalic acid or an ester-forming derivative thereof, (b) tetramethylene glycol or an ester-forming derivative thereof and (c) a poly- (oxyalkylene) glycol having a molecular weight of 500 to 5000 and a carbon atom to oxygen atom numerical ratio of 2 to 4.5, or an ester-forming deri- vative thereof. After the reduced viscosity of the reaction product of (a), (b) and (c) has reached 0.1 d1/g, the reaction product is further reacted with (d) an ester compound containing a terephthalic acid residue and an ethylene glycol residue or an ester containing a terephthalic acid residue and a 1,4-cyclohexane dimethanol residue, whereby to form a block copolymer. The polyesters are useful as material for tubes, bottles and other containers used in the medical and foodstuff fields.

241647

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