US 12,280,570 B2
Laminate
Haruna Kadoya, Tokyo (JP); and Shigeki Kudo, Tokyo (JP)
Assigned to TOPPAN INC., Tokyo (JP)
Filed by TOPPAN INC., Tokyo (JP)
Filed on Aug. 25, 2022, as Appl. No. 17/895,327.
Application 17/895,327 is a continuation of application No. PCT/JP2021/006124, filed on Feb. 18, 2021.
Claims priority of application No. 2020-033186 (JP), filed on Feb. 28, 2020.
Prior Publication US 2022/0410547 A1, Dec. 29, 2022
Int. Cl. B32B 27/08 (2006.01); B32B 7/022 (2019.01); B32B 7/12 (2006.01); B32B 27/36 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 7/022 (2019.01); B32B 7/12 (2013.01); B32B 27/36 (2013.01); B32B 2250/02 (2013.01); B32B 2250/244 (2013.01); B32B 2255/10 (2013.01); B32B 2255/20 (2013.01); B32B 2307/31 (2013.01); B32B 2307/514 (2013.01); B32B 2307/582 (2013.01); B32B 2307/704 (2013.01); B32B 2307/72 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/7246 (2013.01); B32B 2307/734 (2013.01); B32B 2367/00 (2013.01); B32B 2553/00 (2013.01); Y10T 428/31565 (2015.04); Y10T 428/31681 (2015.04); Y10T 428/31786 (2015.04)] 10 Claims
OG exemplary drawing
 
1. A laminate for forming a packaging bag, consisting of:
a substrate layer consisting of (a) a stretched crystalline polyester film consisting of polyethylene terephthalate, (b) a polyurethane resin adhesive layer in direct contact with the crystalline polyester film, and (c) a sealant layer consisting of a polyester film, which is in direct contact with the adhesive layer, wherein
the polyester film of the sealant layer consists of a polyester obtained by condensation polymerization of a terephthalic acid and two or more diols;
the two or more diols comprise ethylene glycol and one or more additional diols selected from the group consisting of neopentyl glycol, 1,4-butanediol, diethylene glycol and 1,4-cyclohexanedimethanol;
the polyester film of the sealant layer has a stretch ratio in an MD direction from 1.1 to 3.0;
the sealant layer has a ratio of a fracture elongation thereof to a thickness thereof which is 13%/μm or less, the fracture elongation being a fracture elongation of the sealant layer as measured in a unit of 15 mm width thereof in the MD direction, wherein the substrate layer is an outermost layer of the laminate and a tear strength of the laminate from 0.2 N to 0.6 N.