Polyester modification Acid side
PET HomoPolymer
Acid – Side Modification
COOH
COOH
O
O
O
O
[ CH 2 CH 2 O C
[ m
[ CH 2 CH 2 O C
C [ n
COOH
C-O
COOH terephthalic acid
isophthalic acid
EG
TPA
EG
TPA
IPA versus TPA
Adding IPA while reducing TPA
Applications PET Homopolymer as used in many BOPET applications PET Bottle-grade PET grades for heavy gauge sheet extrusion up to 5mm PET sealing layer on CPET trays BOPET coextrusion
% of modification 0% of modification approx. 2% IPA
5 to 10% IPA 5 to 10% IPA > 15% up to 36%
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