Patent ID: 8501287

Claim:
A process for making a baby bottle comprising blow molding a preform made from a polymeric material, wherein the polymeric material comprises a polyester material comprising terephthalic acid residues, 2,2,4,4,-tetramethyl-1,3-cyclobutanediol residues and 1,4-cyclohexanedimethanol residues, wherein the preform temperature at the time of inflation is greater than a calculated preform temperature (CPT) determined by the following equation: CPT=(45.44)(SR)−(3.36)(Tg)+454, and is in a range from 150° C. to 220° C., wherein the stretch ratio (SR) of the baby bottle with respect to the preform is 3.0× or less; wherein the Tg of the polymeric material is from 100° C. to 130° C.; and wherein the baby bottle displays shrinkage of 5% or less after immersion in boiling water for one hour.