The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2026
Filed:
Oct. 20, 2021
China Petroleum & Chemical Corporation, Beijing, CN;
Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation, Beijing, CN;
Meng Xu, Beijing, CN;
Shijun Zhang, Beijing, CN;
Dali Gao, Beijing, CN;
Yiqing Bai, Beijing, CN;
Kai Xu, Beijing, CN;
Yueming Ren, Beijing, CN;
Jianye Liu, Beijing, CN;
Hui Quan, Beijing, CN;
Mu Dong, Beijing, CN;
Qi Zhang, Beijing, CN;
Baige Chou, Beijing, CN;
Yun Lyu, Beijing, CN;
Jingbo Shao, Beijing, CN;
Abstract
A propylene polymer-based composite film, a preparation method therefor, and an application thereof are provided. The composite film contains at least two different layers: layer a and layer b. Layer a and layer b each contains at least one propylene polymer, and at least one of layer a and layer b contains a propylene impact copolymer. The propylene impact copolymer contains elastic moieties that form dispersed strip-like rubber phases in the composite film. The rubber phases are arranged parallel to each other. The average dimension of transverse axes of the rubber phases is 20-200 nm and the average of aspect ratios is 5-20. The composite film is can be used in the field of packaging materials, especially in battery packaging materials, electronic product packaging materials, or food packaging materials.