	US 12,247,108 B2
	Stretched film, packaging material, and method for producing stretched film
Masaki Yamanaka, Hiratsuka (JP); and Takafumi Oda, Hiratsuka (JP)
Assigned to Mitsubishi Gas Chemical Company, Inc., Tokyo (JP)
Appl. No. 17/050,338
Filed by Mitsubishi Gas Chemical Company, Inc., Tokyo (JP)
PCT Filed Apr. 25, 2019, PCT No. PCT/JP2019/017591 § 371(c)(1), (2) Date Oct. 23, 2020, PCT Pub. No. WO2019/208687, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 2018-084621 (JP), filed on Apr. 26, 2018.
Prior Publication US 2021/0139213 A1, May 13, 2021
Int. Cl. C08J 5/18 (2006.01); B29C 55/00 (2006.01); B29C 55/02 (2006.01); B32B 27/34 (2006.01); C08L 77/06 (2006.01); B29K 77/00 (2006.01); B32B 27/32 (2006.01); B32B 27/36 (2006.01)

CPC C08J 5/18 (2013.01) [B29C 55/005 (2013.01); B29C 55/02 (2013.01); C08L 77/06 (2013.01); B29K 2077/00 (2013.01); B32B 27/32 (2013.01); B32B 27/34 (2013.01); B32B 27/36 (2013.01); B32B 2270/00 (2013.01); B32B 2439/60 (2013.01); B32B 2439/70 (2013.01); C08L 2203/10 (2013.01); C08L 2203/16 (2013.01); C08L 2205/02 (2013.01)]

15 Claims

1. A stretched film comprising a resin composition comprising from 80 to 5 parts by mass of a polyamide resin (B) relative to from 20 to 95 parts by mass of a polyamide resin (A),

the polyamide resin (A) being an aliphatic polyamide resin,

the polyamide resin (B) containing a constituent unit derived from a diamine and a constituent unit derived from a dicarboxylic acid, 70 mol % or more of the constituent unit derived from a diamine being derived from xylylenediamine, from 50 to 70 mol % of the constituent unit derived from a dicarboxylic acid being derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 8 carbons, and from 50 to 30 mol % of the constituent unit derived from a dicarboxylic acid being derived from isophthalic acid, provided that a total of the constituent units derived from a dicarboxylic acid is not more than 100 mol %, the resin composition being substantially free from silicate,

wherein 80 mass % or more of the stretched film contains the polyamide resin (A) and the polyamide resin (B), and

wherein the stretched film has a modulus of tensile elasticity of 2.50 GPa or more, as measured in accordance with JIS K 7127.