Bio-based Adhesive Tape with Microparticulate Additives
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Solution Overview
Problem
There is a need for pressure-sensitive adhesives that are highly bio-based while maintaining the necessary properties for industrial and private sector applications, particularly in adhesive tapes, where conventional adhesives may not meet ecological and performance requirements.
Innovation Solution
A pressure-sensitive adhesive tape composed of at least 95% by weight bio-based materials, using natural rubber as the base polymer, bio-based adhesive resins, and bio-based microparticulate additives, with specific particle size and density characteristics, and optionally including thermoplastic elastomers, to enhance processability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesives are used in pressure-sensitive adhesive tapes, then adhesive strength and performance are maintained, but ecological sustainability and bio-based content are reduced
Solution Approach 1:
The patent changes the compositional parameters of the adhesive by replacing conventional petroleum-based polymers with bio-based alternatives. Specifically, it uses natural rubber (polyisoprene) as the base polymer and incorporates bio-based adhesive resins, achieving at least 95% by weight bio-based content while maintaining adhesive performance through optimized formulation of these natural components
Solution Approach 2:
The patent creates a composite adhesive system combining multiple bio-based components: natural rubber as the base polymer, bio-based adhesive resins for bonding enhancement, and bio-based microparticulate additives for reinforcement. This composite approach allows each component to contribute specific properties that collectively maintain adhesive strength while achieving high sustainability
2Object-affected harmful factors
If the proportion of bio-based materials is increased to 95% by weight, then ecological standards are met, but adhesive performance and temperature stability may deteriorate
Solution Approach 1:
The patent employs a composite formulation where bio-based microparticulate additives (such as ground natural fibers or plant-based particles) are incorporated into the bio-based adhesive matrix. These particulate reinforcements provide structural support and thermal stability, compensating for the potentially lower temperature resistance of purely organic adhesive components while maintaining the 95% bio-based content requirement
Solution Approach 2:
The patent applies local quality enhancement by adding microparticulate additives specifically designed to improve localized properties such as temperature stability and mechanical reinforcement. These particles are distributed throughout the adhesive layer to provide point-specific reinforcement without compromising the overall bio-based composition or adhesive functionality
3Reliability
If bio-based microparticulate additives are added to enhance performance, then adhesive properties are improved, but manufacturing complexity and processing difficulty increase
Solution Approach 1:
The patent applies preliminary action by pre-processing the microparticulate additives before incorporation into the adhesive. The additives are ground to specific particle size ranges and pre-mixed with the bio-based adhesive components before final tape formation. This pre-preparation simplifies the subsequent manufacturing process by ensuring uniform distribution and proper particle characteristics, reducing processing complexity despite the added functionality
Data Source
AI summary
The invention relates to a pressure-sensitive adhesive composition which is biobased to an extent of at least 95% by weight, preferably 98% by weight, comprising natural rubber as a base polymer and tackifying resins (5) composed of biobased raw materials, wherein the proportion of tackifying resins is 80 to 120 phr, and at least one biobased microparticulate additive which is insoluble in the base polymer or the tackifying resins and does not crosslink with the base polymer or the tackifying resins, in the form of particles and having a bulk density of at least 200 g/l and in which at least 65% of the particles have a particle diameter of less than 32 µm, the proportion of the additive based on the overall pressure-sensitive adhesive composition being between greater than 0% by weight and up to 20% by weight.