Compostable Coldseal Cohesive Composition
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Solution Overview
Problem
Existing coldseal cohesive compositions in packaging applications contain non-biodegradable and non-compostable components, which are not environmentally friendly and do not meet the requirements for biodegradable packaging.
Innovation Solution
A water-based coldseal cohesive composition is developed, comprising between 30 and 90wt% natural rubber latex and between 1 and 30wt% of a biodegradable resinous material, such as proteins like casein or albumin, to replace non-biodegradable components while maintaining sealing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional coldseal cohesive compositions are used, then sealing performance is achieved, but environmental compatibility deteriorates due to non-biodegradable components
Solution Approach 1:
The patent changes the chemical composition parameters of the coldseal cohesive by replacing non-biodegradable polymers (acrylics, styrene acrylics, vinyl acetate) with biodegradable alternatives (natural rubber latex, proteins, starches). This parameter substitution maintains sealing performance while improving environmental compatibility, as the biodegradable components can still provide adequate adhesion and cohesive strength when properly formulated.
Solution Approach 2:
The patent creates a composite coldseal formulation combining multiple biodegradable materials including natural rubber latex (30-90 wt%), proteins (1-30 wt% solids), and starches (1-30 wt% solids). This composite approach allows the different biodegradable components to complement each other's properties, achieving both environmental compatibility and reliable sealing performance that single materials cannot provide alone.
2Object-affected harmful factors
If biodegradable materials are used to replace non-biodegradable components, then environmental compatibility improves, but sealing performance may deteriorate
Solution Approach 1:
The patent optimizes the concentration parameters of biodegradable components to achieve adequate cohesive strength. Specifically, it formulates natural rubber latex at 30-90 wt%, proteins at 1-30 wt% solids, and starches at 1-30 wt% solids. These parameter ranges ensure sufficient cohesive strength for sealing while maintaining biodegradability, as the high natural rubber latex content provides the necessary elastic recovery and bonding strength.
Solution Approach 2:
The patent combines multiple biodegradable materials with complementary strength characteristics. Natural rubber latex provides elastic strength and adhesion, proteins contribute to cohesive bonding, and starches add structural integrity. This composite structure achieves adequate cohesive strength through synergistic interactions while maintaining full biodegradability.
3Strength
If non-biodegradable polymers are used, then cohesive strength is maintained, but compostability deteriorates
Solution Approach 1:
The patent changes the material composition parameters from synthetic non-biodegradable polymers to natural biodegradable alternatives. It specifies natural rubber latex (30-90 wt%), proteins (1-30 wt% solids), and starches (1-30 wt% solids) as the formulation basis. This parameter change ensures compostability while maintaining adhesive strength, as these natural materials can decompose in composting conditions while providing adequate bonding during use.
Solution Approach 2:
The patent creates a composite system of biodegradable materials that collectively provide the adhesive strength previously achieved by non-biodegradable polymers. The combination of natural rubber latex, proteins, and starches in specific proportions ensures both compostability and functional performance, eliminating the need for persistent synthetic polymers while maintaining necessary adhesive properties.
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 composition effectively seals packaging without compromising on biodegradability and compostability, meeting or exceeding the performance of traditional non-biodegradable coldseal compositions.
Implementation Method 1
Cohesive compositions also act as adhesives and adhere to substrates, with the adhesive forces between the cohesive composition and the substrate also resisting separation.
Implementation Method 2
Cohesive compositions are compositions that are capable of bonding to themselves, which can be used to join substrates together... Cohesive compositions bond to themselves, with the cohesive forces resisting separation.
Data Source
AI summary
The present application describes a compostable cold seal cohesive composition. The present application also describes a packaging structure comprising the compostable coldseal cohesive composition of the invention.