Biaxially Oriented Polypropylene Film

Abstract: The purpose of the present invention is to provide a biaxially oriented polypropylene film which has a high loss modulus in a relatively low-temperature region. This biaxially oriented polypropylene film is characterized by: comprising a base layer A comprising a polypropylene-based resin composition and a seal layer B comprising a polypropylene-based resin composition; and satisfying the following requirements (1) and (2). (1) The biaxially oriented polypropylene film includes the seal layer B as at least one uppermost surface. (2) In a dynamic viscoelasticity measurement, the minimum value E”(B) of the loss modulus in a temperature range from 25°C to 75°C is 0.16 GPa or greater.

Patent Information

Application #

Filing Date

11 August 2026

Publication Number

33/2026

Publication Type

INA

Invention Field

POLYMER TECHNOLOGY

Status

Email

Parent Application

Applicants

1. TOYOBO CO., LTD.

13-1, Umeda 1-chome, Kita-ku, Osaka-shi, Osaka 5300001

Inventors

1. HORINOUCHI, Kazuhito

c/o TOYOBO CO., LTD., 1-1, Katata 2-chome, Otsu-shi, Shiga 5200292

2. KIRIYAMA, Kazuya

c/o TOYOBO CO., LTD., 344, aza-Maehata, oaza-Kotsu, Inuyama-shi, Aichi 4848508

3. IMAI, Toru

c/o TOYOBO CO., LTD., 344, aza-Maehata, oaza-Kotsu, Inuyama-shi, Aichi 4848508

Specification

Documents

Application Documents

#	Name	Date
1	202647096700-WIPO_PCT_DOC.pdf	2026-08-11
2	202647096700-STATEMENT OF UNDERTAKING (FORM 3) [11-08-2026(online)].pdf	2026-08-11
3	202647096700-PROOF OF RIGHT [11-08-2026(online)].pdf	2026-08-11
4	202647096700-Proof of Right [11-08-2026(online)]-1.pdf	2026-08-11
5	202647096700-PRIORITY DOCUMENTS [11-08-2026(online)].pdf	2026-08-11
6	202647096700-FORM 18 [11-08-2026(online)].pdf	2026-08-11
7	202647096700-FORM 1 [11-08-2026(online)].pdf	2026-08-11
8	202647096700-DRAWINGS [11-08-2026(online)].pdf	2026-08-11
9	202647096700-DECLARATION OF INVENTORSHIP (FORM 5) [11-08-2026(online)].pdf	2026-08-11
10	202647096700-COMPLETE SPECIFICATION [11-08-2026(online)].pdf	2026-08-11
11	202647096700-FORM-26 [12-08-2026(online)].pdf	2026-08-12
12	202647096700-PATENT_APPLICATION_PUBLICATION.pdf	2026-08-15