US 12,306,096 B2
Method for selecting polyester film, method for producing multilayer body, method for producing package, and multilayer body
Haruna Kadoya, Tokyo (JP); Shigeki Kudo, Tokyo (JP); and Kenji Ogawara, Tokyo (JP)
Assigned to TOPPAN INC., Tokyo (JP)
Appl. No. 17/614,123
Filed by TOPPAN INC., Tokyo (JP)
PCT Filed May 14, 2020, PCT No. PCT/JP2020/019212
§ 371(c)(1), (2) Date Nov. 24, 2021,
PCT Pub. No. WO2020/241272, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 2019-100322 (JP), filed on May 29, 2019; and application No. 2019-228193 (JP), filed on Dec. 18, 2019.
Prior Publication US 2022/0228978 A1, Jul. 21, 2022
Int. Cl. G01N 21/3563 (2014.01); B32B 7/02 (2019.01); B32B 7/12 (2006.01); B32B 15/09 (2006.01); B32B 15/20 (2006.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); B32B 37/12 (2006.01); B32B 37/14 (2006.01); B65B 51/10 (2006.01); B65D 65/40 (2006.01); C08J 7/00 (2006.01); G01N 21/35 (2014.01); G01N 21/84 (2006.01)
CPC G01N 21/3563 (2013.01) [B32B 27/36 (2013.01); B65B 51/10 (2013.01); B65D 65/40 (2013.01); C08J 7/00 (2013.01); B32B 7/02 (2013.01); B32B 7/12 (2013.01); B32B 15/09 (2013.01); B32B 15/20 (2013.01); B32B 27/08 (2013.01); B32B 37/12 (2013.01); B32B 37/14 (2013.01); B32B 2250/03 (2013.01); B32B 2250/24 (2013.01); B32B 2250/244 (2013.01); B32B 2255/10 (2013.01); B32B 2255/20 (2013.01); B32B 2272/00 (2013.01); B32B 2305/70 (2013.01); B32B 2307/31 (2013.01); B32B 2307/702 (2013.01); B32B 2307/704 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/7246 (2013.01); B32B 2439/02 (2013.01); B32B 2439/40 (2013.01); B32B 2439/46 (2013.01); B32B 2439/70 (2013.01); B32B 2439/80 (2013.01); C08J 2367/00 (2013.01); G01N 2021/3595 (2013.01); G01N 21/8422 (2013.01); Y10T 428/2817 (2015.01); Y10T 428/31786 (2015.04)] 10 Claims
OG exemplary drawing
 
1. A method comprising:
a first step including:
determining, by performing FT-IR analysis by a reflection method on an amorphous polyethylene terephthalate film, a first absorbance at a wavenumber of 1,340 cm−1 (I11340), a first absorbance at a wavenumber of 1,370 cm−1 (I11370), and a first absorbance at a wavenumber of 1,409 cm−1 (I11409) and assigning I11340, I11370, and I11409 to:
I11409=p1×I11340+p2×I11370  (Formula 1a);
determining, by performing FT-IR analysis by the reflection method on a crystalline polyethylene terephthalate film that has a different crystallinity than the amorphous polyethylene terephthalate film, a second absorbance at a wavenumber of 1,340 cm−1 (I21340), a second absorbance at a wavenumber of 1,370 cm−1 (I21370), and a second absorbance at a wavenumber of 1,409 cm−1 (I21409) and assigning I21340, I21370, and I21409 to:
I21409=p1×I21340+p2×I21370  (Formula 1b);
a second step including:
obtaining simultaneous equations of p1 and p2 from the Formula 1a and the Formula 1b and solving the simultaneous equations for p1 and p2;
a third step including:
determining, by performing FT-IR analysis by the reflection on a polyethylene terephthalate film of interest, a third absorbance of the polyethylene terephthalate film of interest at a wavenumber of 1,340 cm−1 (I31340) and a third absorbance of the polyethylene terephthalate film of interest at a wavenumber of 1,409 cm−1 (I31409);
measuring a crystallinity of the polyester polyethylene terephthalate film of interest by:
Crystallinity [%]=p1×(I31340/I31409)×100  (Formula 2)
wherein, p1 is the obtained p1 from the second step; and
a fourth step including:
selecting the polyester polyethylene terephthalate film of interest as a first polyethylene terephthalate film of a sealant layer of a multilayer body when the measured crystallinity of the polyethylene terephthalate film of interest is from 2 to 15%, resulting in the multilayer body including a base material layer including crystalline polyester film, an adhesive layer, and the sealant layer in this order.