Oxazoline-modified polypropylene

Oxazoline-modified polypropylene, produced through a specific melt-kneading process, addresses the mechanical strength issues in fiber-reinforced polypropylene compositions, leading to improved performance in automotive components.

JP7734542B2Active Publication Date: 2025-09-05SUMITOMO CHEM CO LTD
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Patent Information

Application Number
JP2021149018
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2020-12-25
Filing Date
2021-09-14
Publication Date
2025-09-05
Estimated Expiration
2041-09-14

AI Technical Summary

Technical Problem

Existing polypropylene compositions used in automotive components lack sufficient mechanical strength when reinforced with fillers like carbon fiber, glass fiber, and talc, despite the use of coupling agents or maleic anhydride-modified polypropylene.

Method used

The introduction of oxazoline-modified polypropylene, produced by melt-kneading polypropylene with an organic peroxide and maleic acid or maleic anhydride, followed by addition of an oxazoline compound, enhances mechanical strength by incorporating oxazoline groups within a specific content range and maintaining a controlled melt mass-flow rate.

Benefits of technology

The oxazoline-modified polypropylene significantly improves the mechanical strength of fiber-reinforced polypropylene compositions, resulting in enhanced performance of molded articles.

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Abstract

To provide a substance useful for improving mechanical strength of a fiber-reinforced polypropylene composition.SOLUTION: There is provided oxazoline-modified polypropylene satisfying the following requirements (1), (1-a), and (2): (1) the oxazoline-modified polypropylene has an oxazoline group; (1-a) the content of the oxazoline group in 1 g of the oxazoline-modified polypropylene is 0.1×10-2 to 100×10-2 mmol / g; and (2) the melt mass flow rate of the oxazoline-modified polypropylene is 0.01 to 300 g / 10 min.SELECTED DRAWING: None
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