Polylactic Acid Adhesive Composition for Renewable Material Performance
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Solution Overview
Problem
Current adhesive systems based on renewable raw materials lack competitiveness with petrochemical-based systems in terms of application technology and economics, particularly in terms of adhesive strength and resistance to environmental influences, and there is a lack of hot melt adhesives available on the market based on renewable materials.
Innovation Solution
A pressure-sensitive adhesive composition comprising 10-60% polylactic acid, 10-60% resin, 2-60% plasticizer, and optionally 0.1-50% wax, with a weight-average molecular weight of 1,000-80,000 g/mol, and a polydispersity of 1.5-7, providing a property profile comparable to petrochemical-based systems and suitable for various industrial and domestic applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If adhesive systems are based on renewable raw materials, then environmental sustainability is improved, but adhesive strength and resistance to environmental influences deteriorate
Solution Approach 1:
The patent applies composite materials by combining polylactic acid (renewable raw material) with petrochemical components (resins, plasticizers, waxes) to create a pressure-sensitive adhesive composition that achieves both environmental sustainability and adequate adhesive strength. The composite formulation allows the renewable polylactic acid component to provide the adhesive base while the petrochemical additives enhance the mechanical properties and environmental resistance to achieve performance comparable to conventional petrochemical-based adhesives.
Solution Approach 2:
The patent applies parameter changes by carefully controlling the molecular weight (1,000-80,000 g/mol) and polydispersity (1.5-7) of the polylactic acid, as well as the specific proportions of all components (10-60% polylactic acid, 10-60% resin, 2-60% plasticizer, 0.1-50% wax). These parameter optimizations enable the adhesive to achieve both renewable material benefits and sufficient adhesive performance.
2Object-generated harmful factors
If adhesive systems are based on renewable raw materials, then CO2 emissions are reduced, but application technology competitiveness deteriorates
Solution Approach 1:
The patent creates a composite adhesive system that maintains application technology competitiveness by combining polylactic acid with proven petrochemical adhesive components. The resulting composition exhibits pressure-sensitive adhesive properties with appropriate tack, peel resistance, and heat resistance that meet industrial application requirements, thereby achieving CO2 emission reductions without sacrificing application performance.
Solution Approach 2:
The patent optimizes application technology parameters by controlling the viscosity through plasticizer selection and concentration (2-60%), adjusting the tack through resin content (10-60%), and setting the service temperature range through wax content (0.1-50%). These parameter adjustments ensure the adhesive performs reliably in practical applications across various industries.
3Quantity of substance
If adhesive systems are based on renewable raw materials, then resource scarcity is addressed, but manufacturing cost increases
Solution Approach 1:
The patent applies composite materials strategy by using polylactic acid as the renewable base component (10-60% content) while supplementing with cost-effective petrochemical resins, plasticizers, and waxes. This composite approach reduces dependence on scarce fossil resources while maintaining manufacturing cost competitiveness through the synergistic combination of renewable and conventional materials.
Solution Approach 2:
The patent achieves multi-functionality by designing an adhesive composition that simultaneously delivers renewable material benefits, adequate adhesive performance, and cost-effectiveness. The formulation works across multiple applications (labeling, sound insulation, vehicle construction) and balances the cost of renewable polylactic acid with the established supply chain and pricing of petrochemical additives.
Data Source
AI summary
Adhesive composition based on renewable raw materials, preferably pressure-sensitive adhesive composition, comprises (a) at least one polymer based on polylactic acid, (b) at least one resin and/or a plasticizer, and (c) optionally at least one wax. An independent claim is also included for joining at least two substrates by adhesive bonding, comprising applying the above adhesive composition on at least one, preferably one of the substrates, and joining the substrates below the processing temperature of the adhesive composition.