Invention Grant
- Patent Title: Multilayer film with reversible haze
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Application No.: US16644795Application Date: 2017-09-05
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Publication No.: US11667104B2Publication Date: 2023-06-06
- Inventor: Rou Hua Chua , Wu Aik Yee , Bee Tin Low , Muthu Selva Annamalai Subramanian , Yutaka Maehara , Jian Wang
- Applicant: Dow Global Technologies LLC
- Applicant Address: US MI Midland
- Assignee: Dow Global Technologies LLC
- Current Assignee: Dow Global Technologies LLC
- Current Assignee Address: US MI Midland
- Agency: Quarles & Brady LLP
- International Application: PCT/SG2017/050439 2017.09.05
- International Announcement: WO2019/050469A 2019.03.14
- Date entered country: 2020-03-05
- Main IPC: B29C48/08
- IPC: B29C48/08 ; B29C48/21 ; B29C48/00 ; B29C55/06 ; B29K96/04 ; B29K105/00 ; B32B7/02 ; B32B27/08 ; B32B27/32 ; B29K23/00

Abstract:
The present disclosure provides a process. In an embodiment, the process includes elongating a multilayer film to a impart a haze value greater than 30% to the multilayer film. The multilayer film has at least two layers: (A) a core layer composed of an ethylene/α-olefin multi-block copolymer and (B) a first skin layer in contact with the core layer, the skin layer composed of an ethylene-based polymer. The process includes releasing the elongating force from the elongated multilayer film to form a hazed multilayer film having a haze value greater than 30%. The process includes stretching the hazed multilayer film to form a stretched multilayer film having a clarity value greater than 80%. The process includes relaxing the stretch force from the stretched multilayer film to form a relaxed multilayer film having a haze value greater than 30%.
Public/Granted literature
- US20210070013A1 Multilayer Film with Reversible Haze Public/Granted day:2021-03-11
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