	US 12,404,400 B2
	Blends of copolyesters having recycled content and high heat resistance
Katherine Augusta Hofmann, Kingsport, TN (US); John Thomas Hofmann, Kingsport, TN (US); and Douglas Weldon Carico, Kingsport, TN (US)
Assigned to Eastman Chemical Company, Kingsport, TN (US)
Appl. No. 17/594,915
Filed by Eastman Chemical Company, Kingsport, TN (US)
PCT Filed May 6, 2020, PCT No. PCT/US2020/031590 § 371(c)(1), (2) Date Nov. 3, 2021, PCT Pub. No. WO2020/231689, PCT Pub. Date Nov. 19, 2020.
Claims priority of provisional application 62/846,076, filed on May 10, 2019.
Prior Publication US 2022/0186021 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08L 67/02 (2006.01)

CPC C08L 67/02 (2013.01) [C08L 2207/20 (2013.01)]

11 Claims

1. A polymer composition comprising a blend of recycled poly(ethylene terephthalate) (rPET) and at least one copolyester,

said copolyester comprising:

(a) diacid residues comprising from 90 to 100 mole percent of terephthalic acid (TPA) residues; and

(b) diol residues comprising 73 to 85 mole percent of ethylene glycol (EG) residues and 15 to 27 mole percent of 2,2,4,4-tetramethyl-1,3-cyclobutanediol (TMCD) residues, wherein the copolyester comprises a total of 100 mole percent diacid residues and a total of 100 mole percent diol residues, wherein the blend comprises 10 to 40 weight percent rPET and has a haze of less than 4% measured on a 10.16×10.16×0.318 cm injection molded plaque using a using a spectrophotometer according to ASTM D1003.