Film, method for manufacturing film, and propylene polymer composition

A propylene polymer composition with balanced molecular chain orientation and specific stretching techniques enhances the tensile modulus and stretchability of biaxially oriented films, overcoming the limitations of polypropylene films in dimensional stability and stretchability.

JP7882774B2Active Publication Date: 2026-06-30SUMITOMO CHEM CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
SUMITOMO CHEM CO LTD
Filing Date
2022-01-20
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Biaxially oriented polypropylene films exhibit lower tensile modulus compared to polyethylene terephthalate films, leading to limited applications and poor dimensional stability and stretchability, particularly in the direction perpendicular to the flow direction during manufacturing.

Method used

A propylene polymer composition and manufacturing method that includes specific orientation and stretching parameters, along with the use of β-nucleating agents and hydrocarbon resins, to achieve balanced molecular chain orientation in both directions, ensuring high tensile modulus and uniform stretchability.

Benefits of technology

The film achieves high tensile modulus and excellent dimensional stability at high temperatures, with uniform stretchability in both directions, addressing the limitations of existing polypropylene films.

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Patent Text Reader

Abstract

The present invention addresses the problem of providing a film which has a relatively high tensile modulus of elasticity (Young's modulus) in both the MD direction and the TD direction, has a relatively low thermal shrinkage rate in the TD direction, and has relatively excellent uniform stretchability in the TD direction during production.　The film contains a propylene-based polymer or a propylene-based polymer composition, and satisfies formula (I) or the like. 0.35<BOMD-BOTD<1.00...(I) -0.35<BOMD-BOTD<1.00...(I) (In the formula, BOMD represents the degree of orientation of the film in the MD direction measured using a birefringence method. BOTD represents the degree of orientation of the film in the TD direction measured using the birefringence method.)
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