Biodegradable fiber

A biodegradable fiber blend of polyethylene terephthalate, polybutylene adipate terephthalate, and polylactic acid addresses brittleness and alkali resistance issues, achieving effective biodegradability and maintaining strength in moist heat environments for diverse applications.

EP4772682A1Pending Publication Date: 2026-07-08KB SEIREN LTD
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
KB SEIREN LTD
Filing Date
2024-03-29
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Existing biodegradable fibers, such as those with a polyethylene terephthalate sheath and polylactic acid core, suffer from brittleness in moist heat environments and poor alkali resistance, limiting their applications, and polyethylene terephthalate fibers are non-biodegradable, contributing to environmental load.

Method used

A biodegradable fiber composed of a blend polymer containing polyethylene terephthalate, polybutylene adipate terephthalate, and polylactic acid, with specific mass content ratios, ensuring biodegradability, alkali resistance, and resistance to moist heat environments.

Benefits of technology

The fiber maintains strength and texture in moist heat environments and exhibits effective biodegradability and alkali resistance, comparable to conventional polyethylene terephthalate fibers, suitable for various applications including clothing and vehicle interiors.

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Abstract

The present invention provides a biodegradable fiber which does not become brittle in a moist heat environment, and which has excellent alkali resistance. Disclosed is a biodegradable fiber, containing a blend polymer containing a polyethylene terephthalate, a polybutylene adipate terephthalate and a polylactic acid, wherein the content of the polyethylene terephthalate in the fiber is 80 mass% or more. It is preferable that the content of the polyethylene terephthalate in the fiber is at least 93 mass% or more, the content of the polybutylene adipate terephthalate in the fiber is 0.4 mass% to 2.4 mass%, the content of the polylactic acid in the fiber is 0.4 mass% to 2.4 mass%, and the ratio of the content of the polybutylene adipate terephthalate to the content of the polylactic acid is 40 / 60 to 60 / 40 in terms of the mass ratio.
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