Detergent Bar Structural Integrity via Polymer Network
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Solution Overview
Problem
Detergent bars face issues with structural integrity and 'mushiness' when exposed to water, with existing solutions like adding cellulose not providing significant improvements.
Innovation Solution
Incorporating 0.05 to 0.8 wt% polyethylene glycol with a molecular weight of at least 1,000,000, along with 0.01 to 5 wt% polyacrylic acid and 0.01 to 1 wt% hydroxypropyl methylcellulose or hydroxyethyl cellulose, to enhance the physical properties of detergent bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If cellulose is added in excess of 1% to improve structural integrity, then the bar shows some improvement, but the bar still suffers from swelling and mushiness
Solution Approach 1:
The patent combines multiple polymers (polyethylene glycol with molecular weight at least 1,000,000, polyacrylic acid with molecular weight 1,000-20,000, and hydroxypropyl methylcellulose) in specific proportions to create a composite material system. This composite approach provides synergistic effects that individually components cannot achieve alone, significantly improving both structural integrity and resistance to swelling and mushiness during water exposure.
Solution Approach 2:
The patent specifies precise parameter ranges for each polymer component: polyethylene glycol (0.05-0.8 wt%, molecular weight ≥1,000,000), polyacrylic acid (0.01-5 wt%, molecular weight 1,000-20,000), and hydroxypropyl methylcellulose (0.01-1 wt%). These controlled parameter changes optimize the balance between structural integrity and resistance to water-induced degradation, resolving the contradiction between strength and reliability.
2Strength
If polymers are added to improve structural integrity, then the bar maintains its shape better, but the bar becomes susceptible to wear
Solution Approach 1:
The patent optimizes the molecular weight parameters of the polymers used: polyethylene glycol with molecular weight at least 1,000,000 provides structural support, while polyacrylic acid with molecular weight 1,000-20,000 contributes to surface properties. This careful selection of molecular weight parameters achieves the dual benefit of improved structural integrity and reduced wear, eliminating the harmful effect of increased susceptibility to wear.
3Object-generated harmful factors
If high molecular weight polyethylene glycol is used to reduce wear, then wear resistance improves, but the bar composition becomes more complex
Solution Approach 1:
The patent uses high molecular weight polyethylene glycol (molecular weight at least 1,000,000) within a controlled concentration range (0.05-0.8 wt%) to provide wear resistance. By specifying precise parameter ranges for all components, the patent manages composition complexity while achieving the desired wear resistance improvement.
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 solution significantly improves the structural integrity and resistance to wear and 'mushiness' of detergent bars, as demonstrated by reduced weight loss and improved performance in water exposure tests.
Implementation Method 1
Incorporating 0.05 to 0.8 wt% polyethylene glycol with a molecular weight of at least 1,000,000, along with 0.01 to 5 wt% polyacrylic acid and 0.01 to 1 wt% hydroxypropyl methylcellulose or hydroxyethyl cellulose, to enhance the physical properties of detergent bars
Data Source
AI summary
A detergent bar comprising from 0.01 to 1 wt% polyethylene glycol having a molecular weight of at least 100,000 and at least one of: (a) from 0.01 to 5 wt% polyacrylic acid having a molecular weight from 1,000 to 20,000; (b) from 0.01 to 1 wt% hydroxypropyl methylcellulose; and (c) from 0.01 to 1 wt% hydroxyethyl cellulose.