Polyamide-410 Mono-filaments for Wet Bend Recovery
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Solution Overview
Problem
Existing brushes with nylon mono-filaments lack high wet bend recovery, which limits their usage and does not effectively retain stiffness under wet conditions, particularly in toothbrush applications.
Innovation Solution
A brush containing mono-filaments made of polyamide-410, with at least 40 wt.% of the polyamide composition, which exhibits high wet bend recovery and retains stiffness, and is partly based on renewable resources, enhancing mechanical properties and reducing greenhouse gas production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional nylon mono-filaments (PA-66, PA-610) are used in brushes, then the brush can be manufactured with standard materials, but the wet bend recovery is insufficient and stiffness is not retained under wet conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the polyamide by incorporating polyamide-410 with specific monomer units (dicarboxylic acid with 10 carbon atoms and diamine with 4 carbon atoms) in controlled ratios. This parameter change in molecular structure results in improved wet bend recovery and stiffness retention while maintaining manufacturability
Solution Approach 2:
The patent creates a composite polyamide material by combining polyamide-410 with other polyamide components in specific weight ratios (at least 40 wt% PA-410). This composite approach allows optimization of both mechanical properties (wet bend recovery, stiffness) and processing characteristics
2Reliability
If polyamide-410 is used to improve wet bend recovery and stiffness retention, then the brush performance under wet conditions is enhanced, but the manufacturing complexity increases due to specific composition requirements
Solution Approach 1:
The patent establishes specific parameter ranges for polyamide-410 content (at least 40 wt%) and monomer composition that balance performance improvement with manufacturing feasibility. These defined parameters provide clear manufacturing specifications while achieving the desired wet bend recovery and stiffness retention
3Object-generated harmful factors
If traditional fossil-based polyamides are used, then the manufacturing process is well-established, but greenhouse gas emissions and environmental impact are high
Solution Approach 1:
The patent changes the source material parameters by incorporating bio-based monomers (dicarboxylic acid with 10 carbon atoms and diamine with 4 carbon atoms) into the polyamide structure. This parameter change in material origin reduces reliance on fossil resources and decreases greenhouse gas emissions while maintaining compatibility with existing manufacturing processes
Solution Approach 2:
The patent creates a composite polyamide system that combines bio-based polyamide-410 with other polyamide components. This composite approach allows gradual transition to sustainable materials while maintaining manufacturing process stability and product performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The polyamide-410 mono-filaments demonstrate superior wet bend recovery and stiffness retention, extending the brush's lifespan and reducing CO2 emissions, making them suitable for toothbrush bristles with improved performance and environmental benefits.
Implementation Method 1
Wet bend recovery is the ability of a material to return to its original shape after deformation while being wet
Implementation Method 2
stiffness retention when wet is good... the ability to retain stiffness, usually measured as tensile modulus in MPa under humid conditions, i.e. under 50% relative humidity, compared to dry conditions
Data Source
AI summary
This invention relates to a brush containing mono-filaments containing a polyamide which comprises polyamide-410. Preferably, the brush is a toothbrush.