TPU Multifilament Yarn Composition for Melt-Spinning Stickiness Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Thermoplastic polyurethane multifilament yarns are prone to stickiness during melt spinning, which hinders their formation, and the addition of UV absorbers and hindered amine light stabilizers for UV protection often thermally decomposes, exacerbating stickiness and causing discoloration.

Innovation Solution

Incorporating a polystyrene component in the range of 5-20 wt% with UV absorbers and hindered amine light stabilizers into the thermoplastic polyurethane material to reduce stickiness and prevent discoloration, allowing for the production of UV-resistant multifilament yarns with a matte surface.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If thermoplastic polyurethane is used for multifilament yarn manufacturing, then UV protection can be achieved with UV absorbers and hindered amine light stabilizers, but the additives thermally decompose at melt spinning temperatures, increasing stickiness and causing discoloration

Engineering Contradiction:

ImproveUV-induced discolorationVSAvoidthermal decomposition and stickiness

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent modifies the chemical composition parameters of the TPU material by incorporating specific additives (polystyrene at 5-20 wt%, UV absorbers, and hindered amine light stabilizers) to change the material's thermal and optical properties, enabling UV protection while maintaining processability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite TPU material system combining multiple components: base TPU, polystyrene for stickiness control, UV absorbers for photoprotection, and hindered amine light stabilizers for long-term stability. This composite approach allows each component to address specific issues without compromising the others

Inventive Principle:

Principle #40Composite materials

2Productivity

If TPU is extruded through a spinneret to form filaments, then multifilament yarn can be produced, but the sticky nature of TPU causes filaments to entangle and prevents effective yarn formation

Engineering Contradiction:

Improvemultifilament yarn productionVSAvoidfilament handling and yarn formation

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent adjusts the melt viscosity and surface properties of TPU by adding polystyrene and controlling extrusion parameters (temperature, shear rate) to reduce stickiness during filament formation, enabling smooth yarn production

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The added polystyrene acts as an intermediary substance that modifies the surface characteristics of the TPU filaments, reducing inter-filament adhesion and preventing entanglement during the spinning and winding processes

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4603625A1Thermoplastic polyurethane multifilament yarn for a textile product

Publication Date: 2025.08.20 HUNTSMAN INTERNATIONAL LLC

AI summary

The present disclosure provides a thermoplastic polyurethane multifilament yarn for a textile product, wherein the thermoplastic polyurethane multifilament yarn is produced from a thermoplastic polyurethane material comprising: (v) a thermoplastic polyurethane component; (vi) a polystyrene component; (vii) an ultraviolet absorber; and (viii) a hindered amine light stabilizer, wherein the polystyrene component is present in an amount of from about 5 wt% to about 20 wt%, based upon the total weight of the thermoplastic polyurethane material.