Low intrinsic viscosity drop, low acetaldehyde, polyesters

The low intrinsic viscosity drop, low acetaldehyde, polyester composition of the invention typically produce packaging materials such as bottles. The polyester, generally PET, uses additives such as fumed silicon dioxide. The additives are added in small amounts for achieving the following benefits: (i) lower I.V. (intrinsic viscosity) drop during the injection molding process; (ii) lower levels of acetaldehyde in the resultant preforms/bottles. These properties are achieved without affecting strain-hardening properties during the stretch-blow molding operation; and without affecting anti-blemishness properties in the final bottles. These additives alone or in conjunction with carbon black provide the faster line speeds that production needs.