	US 11,746,185 B2
	Pet composition, pet preform, refillable pet bottle and methods for making the same
David Eugene Thompson, Charlotte, NC (US); and Damian Adrian Salazar Hernandez, Charlotte, NC (US)
Assigned to ALPEK POLYESTER, S.A. DE C.V., Nuevo Leon (MX)
Filed by ALPEK POLYESTER, S.A. DE C.V., Nuevo Leon (MX)
Filed on Dec. 3, 2021, as Appl. No. 17/541,408.
Application 17/541,408 is a division of application No. 16/557,337, filed on Aug. 30, 2019, granted, now 11,261,292.
Claims priority of provisional application 62/727,920, filed on Sep. 6, 2018.
Prior Publication US 2022/0089812 A1, Mar. 24, 2022
Int. Cl. C08G 63/199 (2006.01); B65D 1/02 (2006.01); B29B 11/08 (2006.01); B29K 67/00 (2006.01)

CPC C08G 63/199 (2013.01) [B29B 11/08 (2013.01); B65D 1/0207 (2013.01); B65D 1/0246 (2013.01); B65D 1/0276 (2013.01); B29C 2949/0811 (2022.05); B29K 2067/003 (2013.01); B29K 2995/0018 (2013.01); C08G 2390/00 (2013.01)]

5 Claims

1. A method for forming a refillable bottle preform, comprising:

injection molding a polyester resin composition in a mold to form the refillable bottle preform having a maximum wall thickness of 7.5 mm,

wherein a cavity surface of the mold is at a temperature of from 60 to 90° C.;

wherein the refillable bottle preform formed by the injection molding has a haze of 10% or less according to ASTM D-1003 at a thickness of more than 4.5 mm; and

wherein the polyester resin composition comprises:

(1) a polyester resin comprising polycondensed units of one or more dicarboxylic acids and one or more diols,

wherein the dicarboxylic acid comprises from 90 mol % to 97 mol % percent of terephthalic acid and the diol comprises from 90 mol % to 99 mol % of ethylene glycol;

wherein the polyester resin has an intrinsic viscosity of from 0.81 to 0.85 dl/g and a haze of less than 5% at a thickness of between 4.5 and 6 mm according to ASTM D-1003-B;

wherein the polyester resin further comprises polycondensed units of isophthalic acid in an amount of 3-4 mol % based on the total moles of polycondensed units of dicarboxylic acid in the polyester resin, and cyclohexane dimethanol in an amount of 1 to 3 mol % based on the total moles of polycondensed units of diols in the polyester resin; and

(2) from 125 to 200 ppm of Sb and 2 to 5 ppm of Ti; and

wherein a change in the fill point volume after 5 wash cycles of a 2.5 liter blow molded bottle that is blow molded from the refillable bottle preform is 14 ml or less.