US 11,667,104 B2
Multilayer film with reversible haze
Rou Hua Chua, Singapore (SG); Wu Aik Yee, Singapore (SG); Bee Tin Low, Singapore (SG); Muthu Selva Annamalai Subramanian, Singapore (SG); Yutaka Maehara, Kanagawa (JP); and Jian Wang, Singapore (SG)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 16/644,795
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Sep. 5, 2017, PCT No. PCT/SG2017/050439
§ 371(c)(1), (2) Date Mar. 5, 2020,
PCT Pub. No. WO2019/050469, PCT Pub. Date Mar. 14, 2019.
Prior Publication US 2021/0070013 A1, Mar. 11, 2021
Int. Cl. B29C 48/08 (2019.01); B29C 48/21 (2019.01); B29C 48/00 (2019.01); B29C 55/06 (2006.01); B29K 96/04 (2006.01); B29K 105/00 (2006.01); B32B 7/02 (2019.01); B32B 27/08 (2006.01); B32B 27/32 (2006.01); B29K 23/00 (2006.01)
CPC B32B 7/02 (2013.01) [B29C 48/0018 (2019.02); B29C 48/08 (2019.02); B29C 48/21 (2019.02); B29C 55/06 (2013.01); B32B 27/08 (2013.01); B32B 27/32 (2013.01); B29K 2023/08 (2013.01); B29K 2096/04 (2013.01); B29K 2105/0085 (2013.01); B29K 2995/0018 (2013.01); B29K 2995/0051 (2013.01); B32B 2250/02 (2013.01); B32B 2250/242 (2013.01); B32B 2307/40 (2013.01); B32B 2307/516 (2013.01)] 15 Claims
 
6. A multilayer film comprising:
(A) a core layer consisting of an ethylene/α-olefin multi-block copolymer consisting of (i) ethylene and (ii) a C4-C8 α-olefin comonomer, and having a density from 0.865 g/cc to 0.880 g/cc;
(B) a first skin layer in direct contact with the core layer;
(C) a second skin layer in direct contact with the core layer;
the multilayer film is a mono-axially oriented hazed multilayer film and has a haze value greater the 30%, the hazed multilayer film has a layer volume ratio of skin layer (C)-core layer (A)-to-skin layer (B) from 1:4:1 to 1:8:1; and
the hazed multilayer film exhibits a clarity value greater than 80% when subjected to a stretching force from at least 150% elongation to less than or equal to 300% elongation, the hazed multilayer film further exhibiting a haze value greater than 30% when the stretching force is removed,
the haze measured in accordance with ASTM D1003 and the clarity measured in accordance with ASTM D 1746-15.