US 12,226,980 B2
Laminate
Shigeki Kudo, Tokyo (JP); and Haruna Kadoya, Tokyo (JP)
Assigned to TOPPAN INC., Tokyo (JP)
Filed by TOPPAN INC., Tokyo (JP)
Filed on Jun. 15, 2022, as Appl. No. 17/841,027.
Application 17/841,027 is a continuation of application No. PCT/JP2020/046376, filed on Dec. 11, 2020.
Claims priority of application No. 2019-228058 (JP), filed on Dec. 18, 2019.
Prior Publication US 2022/0314589 A1, Oct. 6, 2022
Int. Cl. B32B 27/08 (2006.01); B32B 7/12 (2006.01); B32B 37/06 (2006.01); B32B 37/24 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 7/12 (2013.01); B32B 37/06 (2013.01); B32B 2037/246 (2013.01); B32B 2250/244 (2013.01); B32B 2307/704 (2013.01); B32B 2307/7246 (2013.01); B32B 2439/46 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A laminate for forming a bag for use as packaging of an acidic or alkaline substance, the laminate, comprising, in sequence:
a substrate layer;
an adhesive layer; and
a sealant monolayer,
wherein
the sealant monolayer consists of (a) one or more polyester selected from the group consisting of polybutylene terephthalate, polybutylene naphthalate, and polyethylene terephthalate and (b) one or more optional additives selected from the group consisting of a flame retardant, slip agent, anti-blocking agent, antioxidant, light stabilizer, and tackifier,
the sealant monolayer has a thickness from 15 μm to 60 μm;
the laminate has a water vapor transmission rate of 0.5 g/m2/day or less;
the laminate has an oxygen transmission rate of 0.2 cc/m2/day or less;
and
the sealant monolayer has a crystallinity of 20 to 50%, the crystallinity of the sealant monolayer being defined based on a first absorbance at a first wavenumber of 1409 cm−1, a second absorbance at a second wavenumber of 1370 cm−1, a third absorbance at a third wavenumber of 1340 cm−1, a first constant, and a second constant, the first to third absorbances and the first and second constants being determined based on Fourier transform infrared (FT-IR) analysis, which uses a reflection method, on at least the sealant monolayer the crystallinity of the sealant monolayer being expressed in accordance with the following formulas (1) and (2):
I1409=p1×I1340+p2×I1370  (Formula 1)
C=p1×(I1340/I1409)×100  (Formula 2)
where
C represents the crystallinity in percent,
I1409 represents the first absorbance at the first wavenumber,
I1370 represents the second absorbance at the second wavenumber,
I1340 represents the third absorbance at the third wavenumber,
p1 represents the first constant, and
p2 represents the second constant.