	US 12,065,538 B2
	Poly(glycolic acid) for containers and films with reduced gas permeability
Peter Kezios, Charlotte, NC (US); and Thomas Taylor, Charlotte, NC (US)
Assigned to DAK AMERICAS LLC, Charlotte, NC (US)
Filed by DAK AMERICAS LLC, Charlotte, NC (US)
Filed on Oct. 21, 2022, as Appl. No. 17/971,302.
Application 17/971,302 is a division of application No. 16/728,144, filed on Dec. 27, 2019, granted, now 11,548,979.
Prior Publication US 2023/0323020 A1, Oct. 12, 2023
Int. Cl. C08G 63/08 (2006.01); B29D 22/00 (2006.01); B29K 67/00 (2006.01); C08K 5/092 (2006.01); C08K 5/1539 (2006.01); C08L 67/02 (2006.01); C08L 67/04 (2006.01)

CPC C08G 63/08 (2013.01) [B29D 22/003 (2013.01); C08K 5/092 (2013.01); C08K 5/1539 (2013.01); C08L 67/02 (2013.01); C08L 67/04 (2013.01); B29K 2067/003 (2013.01); B29K 2067/043 (2013.01); B29K 2067/046 (2013.01); C08L 2203/16 (2013.01)]

9 Claims

1. A thermoplastic polymer, comprising reacted units of:

(i) a hydroxy acid compound selected from the group consisting of glycolic acid, lactic acid, and mixtures thereof, and

(ii) 0.5-2.5 wt % of a di-functional diol initiator comprising one or more diols, and

(iii) 0.2 to 1 wt % of a multi-functional polyol initiator selected from the group consisting of pentaerythritol, glycerol, triethanolamine, and mixtures thereof, and

(iv) from 0.15 to 0.45 wt % of methoxyacetic acid chain-terminator, and

(v) optionally, a reactive chain-extending coupling-agent comprising a di-isocyanate;

and one or more components that may optionally be reacted with the thermoplastic polymer:

(vi) optionally, one or more catalysts selected from the group consisting of antimony trioxide, antimony glycolate, camphorsulfonic acid, cobalt acetate, tin (II) chloride, stannous actuate, zinc acetate, zinc lactate, methanesulfonic acid, and mixtures thereof, and

(vii) optionally, an additive package selected from the group consisting of a catalyst deactivator, a heavy-metal deactivator, a heat stabilizer, an antioxidant, and mixtures thereof.