Biobased Laundry Sheet Matrix Replacing PVA Binder
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Solution Overview
Problem
Commercially available solid detergent sheets rely heavily on polyvinyl alcohol (PVA) as a binder, which is not a renewable resource, reducing the biobased content and limiting the development of eco-friendly alternatives for forming dissolvable matrices in solid detergent products.
Innovation Solution
The use of a biobased binder, such as hydroxyethyl cellulose, to create a water-soluble matrix that suspends and binds detergent components in solid detergent sheets, replacing PVA and maintaining high biobased content without fossil-fuel based carbon, forming a polysaccharide-based matrix that dissolves in water to release detergents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyvinyl alcohol (PVA) is used as a binder in solid detergent sheets, then the matrix has sufficient binding strength and water solubility, but the biobased content is reduced due to PVA being a petroleum-derived compound
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by replacing PVA with biodegradable polymers having specific molecular weights (5,000-1,000,000 g/mol) and functional groups. The binder composition is modified to include carboxyl groups (0.1-10 mmol/g) and hydroxyl groups (0.1-10 mmol/g) to achieve both binding strength and water solubility while maintaining high biobased content (≥80% biodegradable polymer by weight).
Solution Approach 2:
The patent creates a composite binder system combining multiple biodegradable polymers (e.g., polyvinyl alcohol-free alternatives like cellulose derivatives, starch, chitosan, or polylactic acid) with specific functional additives. This composite approach achieves the required binding properties without relying on single-component PVA, thereby eliminating fossil-fuel based carbon while maintaining matrix integrity and solubility.
2Reliability
If PVA is used to form the polymer matrix, then the detergent sheet dissolves effectively in water, but the product contains fossil-fuel based carbon reducing its sustainability
Solution Approach 1:
The patent modifies the chemical parameters of the polymer matrix by selecting biodegradable polymers with specific functional groups (carboxyl, hydroxyl) and molecular weight ranges that ensure water solubility. The composition specifies 0.1-10 mmol/g of carboxyl groups and 0.1-10 mmol/g of hydroxyl groups to maintain dissolution properties while using ≥80% biodegradable polymer content, eliminating fossil-fuel based carbon from the matrix.
Solution Approach 2:
The patent employs biodegradable polymers that are designed to decompose and dissolve in water, functioning as temporary, single-use matrix structures. These biodegradable polymers (cellulose derivatives, starch, chitosan, polylactic acid) replace persistent PVA with materials that naturally decompose, eliminating fossil-fuel based carbon and aligning with disposable laundry sheet usage patterns.
3Quantity of substance
If alternative biobased binders are used instead of PVA, then the biobased content increases, but the binding strength and water solubility may be compromised
Solution Approach 1:
The patent optimizes the parameters of biobased binders by specifying molecular weight ranges (5,000-1,000,000 g/mol) and functional group concentrations (carboxyl: 0.1-10 mmol/g, hydroxyl: 0.1-10 mmol/g). These parameter adjustments ensure that alternative biobased polymers achieve sufficient binding strength to hold detergent components while maintaining water solubility and high biobased content (≥80% biodegradable polymer by weight).
Solution Approach 2:
The patent develops composite binder formulations combining multiple biodegradable polymers with complementary properties. Examples include combining cellulose derivatives with starch, chitosan, or polylactic acid to achieve synergistic effects that enhance binding strength while maintaining water solubility and high biobased content, overcoming the limitations of single-component alternatives.
Data Source
AI summary
Provided herein are formulations for liquidless cleansing products having high biobased content. The cleansing formulations may be substantially free of polyvinyl alcohol. The cleansing composition may contain no more than a negligible amount of polyvinyl alcohol. The cleansing composition may contain no detectable amount of polyvinyl alcohol.