Hot Melt Adhesive Compatibility with Polylactic Acid Resin
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Solution Overview
Problem
Hot melt adhesives containing polylactic acid-based resins have insufficient compatibility with other components, leading to poor pressure-sensitive adhesiveness, adhesion, and thermal stability, particularly when used in disposable products like diapers and napkins.
Innovation Solution
A hot melt adhesive composition comprising a polar functional group-modified conjugated diene-based polymer, an aliphatic polyester-based resin, a tackifier resin, and a thermoplastic copolymer, which improves compatibility and enhances adhesion and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If polylactic acid-based resins are used as hot melt adhesive, then environmental friendliness is improved, but compatibility with other components deteriorates
Solution Approach 1:
The patent introduces a compatibility improver as an intermediary substance that mediates between the polylactic acid-based resin and other components (tackifier resin, etc.). This compatibility improver has specific chemical structure characteristics that enable it to interact with both the polylactic acid-based resin and other components, thereby improving overall compatibility without compromising environmental friendliness.
Solution Approach 2:
The patent creates a composite adhesive system comprising polylactic acid-based resin, compatibility improver, and tackifier resin. By combining multiple materials with complementary properties, the system achieves both environmental friendliness (from polylactic acid) and improved compatibility (from the composite structure with compatibility improver).
2Object-affected harmful factors
If polylactic acid-based resins are used in hot melt adhesive, then environmental friendliness is improved, but pressure-sensitive adhesiveness deteriorates
Solution Approach 1:
The patent merges the environmental benefits of polylactic acid-based resin with the adhesive properties of tackifier resin and compatibility improver. The compatibility improver acts as a bridge that enables effective merging of these components, allowing the adhesive to achieve both environmental friendliness and sufficient pressure-sensitive adhesiveness.
Solution Approach 2:
The patent optimizes the composition parameters, specifically controlling the ratios of polylactic acid-based resin, compatibility improver, and tackifier resin. By adjusting these parameters within specific ranges, the adhesive achieves optimal balance between environmental friendliness and pressure-sensitive adhesiveness.
3Object-affected harmful factors
If polylactic acid-based resins are used in hot melt adhesive, then environmental friendliness is improved, but adhesion deteriorates
Solution Approach 1:
The compatibility improver serves as a mediator that enhances the interaction between the polylactic acid-based resin and base materials. It provides chemical or physical groups that improve bonding to various substrates, thereby achieving sufficient adhesion while maintaining environmental friendliness.
4Object-affected harmful factors
If polylactic acid-based resins are used in hot melt adhesive, then environmental friendliness is improved, but thermal stability deteriorates
Solution Approach 1:
The patent creates a composite system where the compatibility improver and tackifier resin contribute to thermal stability. The synergistic interaction among components compensates for the relatively lower thermal stability of pure polylactic acid-based resin, achieving acceptable thermal performance while maintaining environmental friendliness.
Data Source
AI summary
The present invention provides a hot melt adhesive being highly environmentally-friendly, and as well having sufficient tackiness, adhesion, thermal stability and the like. The present invention relates to a hot melt adhesive comprising (A) a polar functional group-modified conjugated diene-based polymer, (B) an aliphatic polyester-based resin, and (C) a tackifier resin.