US 11,794,457 B2
Multilayered stretched polyamide film
Takamichi Goto, Inuyama (JP); and Takuro Endo, Inuyama (JP)
Assigned to TOYOBO CO., LTD., Osaka (JP)
Appl. No. 17/765,623
Filed by TOYOBO CO., LTD., Osaka (JP)
PCT Filed Aug. 26, 2020, PCT No. PCT/JP2020/032243
§ 371(c)(1), (2) Date Mar. 31, 2022,
PCT Pub. No. WO2021/065257, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 2019-183713 (JP), filed on Oct. 4, 2019.
Prior Publication US 2022/0266580 A1, Aug. 25, 2022
Int. Cl. B32B 27/34 (2006.01); B29C 48/00 (2019.01); B29C 48/21 (2019.01); B29C 55/00 (2006.01); B29C 55/14 (2006.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/20 (2006.01); B32B 37/15 (2006.01); B32B 38/00 (2006.01); B29K 77/00 (2006.01); B29L 7/00 (2006.01)
CPC B32B 27/34 (2013.01) [B29C 48/0018 (2019.02); B29C 48/022 (2019.02); B29C 48/21 (2019.02); B29C 55/005 (2013.01); B29C 55/143 (2013.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/20 (2013.01); B32B 37/153 (2013.01); B32B 38/0012 (2013.01); B29K 2077/00 (2013.01); B29L 2007/002 (2013.01); B32B 2038/0028 (2013.01); B32B 2250/03 (2013.01); B32B 2250/24 (2013.01); B32B 2264/1021 (2020.08); B32B 2264/303 (2020.08); B32B 2307/518 (2013.01); B32B 2307/54 (2013.01); B32B 2307/558 (2013.01); B32B 2307/581 (2013.01); B32B 2307/7265 (2013.01); B32B 2307/732 (2013.01); B32B 2439/46 (2013.01); B32B 2439/70 (2013.01); B32B 2553/00 (2013.01)] 4 Claims
 
1. A multilayered stretched polyamide film which is biaxially stretched, and comprises at least three layers composed of a polyamide resin composition and comprising layer B as an easily adhesive layer, layer A as a base layer, and layer C as an easily slippery layer in this order, wherein the film satisfies the following (1) to (6):
(1) the layer A contains 50 to 90% by mass of polyamide 6 and 10 to 50% by mass of a polyamide 6 copolymer in which a ratio of a copolymerization component in the copolymer is 3 to 35% by mass;
(2) the layer B contains 0 to 40% by mass of polyamide 6 and 60 to 100% by mass of the polyamide 6 copolymer in which a ratio of the copolymerization component in the copolymer is 3 to 35% by mass;
(3) the layer C contains 70% by mass or more of polyamide 6 and 0.05 to 1% by mass of fine particles having an average diameter of 0.1 to 10 μm;
(4) the film has tensile strength at break of 150 MPa or more both in MD direction and TD direction;
(5) the film has laminate strength of 3.3 N/15 mm or more; and
(6) the polyamide 6 copolymer contained in the layer B is a polyamide 6/66 copolymer or a polyamide 6-12 copolymer.