Dryer sheets comprising branched polyester polymers
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Solution Overview
Problem
Conventional dryer sheets using quaternary ammonium softeners face limitations such as narrow pH formulation window, stability issues, and compatibility problems with anionic materials, and high molecular weight polymeric softeners are difficult to process and dispose of.
Innovation Solution
The use of branched polyester polymers as softening agents in dryer sheets, which provide improved performance without the drawbacks of conventional systems, including a range of substrate materials and a specific weight ratio of branched polyester polymer to substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quaternary ammonium softeners are used in dryer sheets, then softening performance is provided, but the formulation has narrow pH window and stability issues
Solution Approach 1:
The patent changes the chemical parameters of the softening agent from quaternary ammonium compounds to branched polyester polymers with specific molecular weight ranges (5,000-500,000 g/mol) and branching structures. This parameter change enables the softener to function across a broader pH range while maintaining stability and performance consistency.
2Reliability
If high molecular weight polymeric softeners are used, then softening performance is improved, but viscosity increases making processing and disposal difficult
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polyester polymer to fall within 5,000-500,000 g/mol, and controls the degree of branching. This parameter optimization achieves high softening performance while maintaining manageable viscosity levels that facilitate easy processing and disposal, avoiding the excessive viscosity problems of higher molecular weight polymers.
Solution Approach 2:
The patent uses branched polyester polymers that combine the beneficial properties of high molecular weight polymers (improved softening performance) with controlled branching structures that maintain lower viscosity. This composite approach allows the material to exhibit both high performance and ease of processing simultaneously.
Data Source
AI summary
The present invention relates to dryer sheets comprising branched polyester polymers and methods of making and using such dryer sheets. Such dryer sheets, can comprise a variety substrate materials and provide the desired level of performance without the technical and economic drawbacks of conventional dryer sheets.