US 11,939,495 B2
Oxygen-absorbing film
Yoichi Tadokoro, Kanagawa (JP); Yoichi Ishizaki, Kanagawa (JP); and Yoshihiro Ohta, Kanagawa (JP)
Assigned to Toyo Seikan Group Holdings, Ltd., Tokyo (JP)
Filed by Toyo Seikan Group Holdings, Ltd., Tokyo (JP)
Filed on Aug. 6, 2020, as Appl. No. 16/986,470.
Application 16/986,470 is a division of application No. 14/759,420, granted, now 10,774,248, previously published as PCT/JP2014/050972, filed on Jan. 20, 2014.
Claims priority of application No. 2013-007658 (JP), filed on Jan. 18, 2013; and application No. 2013-007659 (JP), filed on Jan. 18, 2013.
Prior Publication US 2020/0362211 A1, Nov. 19, 2020
Int. Cl. C09J 167/02 (2006.01); B65D 81/26 (2006.01); C08L 67/00 (2006.01); C09J 7/20 (2018.01); C09J 11/08 (2006.01); C09J 167/06 (2006.01); C09J 175/04 (2006.01)
CPC C09J 167/02 (2013.01) [B65D 81/266 (2013.01); C08L 67/00 (2013.01); C09J 7/20 (2018.01); C09J 11/08 (2013.01); C09J 167/06 (2013.01); C09J 175/04 (2013.01)] 12 Claims
 
1. An oxygen-absorbing film comprising an oxygen-absorbing adhesive layer made of an oxygen-absorbing adhesive resin composition cured at 35° C. in a nitrogen atmosphere, wherein:
the oxygen-absorbing adhesive resin composition has at least two glass transition temperatures after exposure to oxygen at 40° C. for two months, the lowest glass transition temperature thereof is less than 0° C., the oxygen-absorbing film has a single-phase compatible system prior to said oxygen exposure, the oxygen-absorbing adhesive resin composition comprises a cured oxygen-absorbing polyester-based resin (A) and a component containing a saturated polyester resin (B) having a glass transition temperature of −10° C. or less, a ratio A/B of the oxygen-absorbing polyester-based resin (A) to the saturated polyester resin (B) is 1 to 9, and a laminate strength of the film is not less than 1N/15 mm in a T-peel test at a peeling speed of 300 mm/min, the cured oxygen-absorbing adhesive resin composition is obtained by blending the oxygen-absorbing polyester-based resin (A) and the saturated polyester resin (B) with a polyisocyanate compound in an amount of 3 phr to 15 phr, wherein the polyisocyanate compound is an adduct or an isocyanurate comprising at least one of isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), and xylylene diisocyanate (XDI),
the oxygen-absorbing polyester-based resin (A) further comprises a transition metal catalyst, in an amount of 50 ppm to 1000 ppm with respect to an amount of the transition metal,
the oxygen-absorbing polyester-based resin (A) is made from a tetrahydrophthalic acid, a derivative thereof, a tetrahydrophthalic anhydride, or a derivative thereof, and a diol component selected from the group consisting of trimethylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, and derivatives thereof, and the saturated polyester resin (B) contains a structural unit derived from a diol component selected from the group consisting of trimethylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, and derivatives thereof and a structural unit derived from a dicarboxylic acid component selected from the group consisting of adipic acid, sebacic acid, isophthalic acid, and combinations thereof.