Polypropylene Resin Composition for Hot-Melt Adhesive Control
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Solution Overview
Problem
Current polyolefin-based resin compositions for hot-melt adhesives and elastic nonwoven fabrics face challenges in controlling solidification speed and heat resistance, and the components used are insufficient in granulability and flexibility.
Innovation Solution
A polypropylene-based resin composition is developed, comprising two types of polypropylene-based resins (A and B) with specific melting endotherm, melting point, and stereoregularity fractions, along with a petroleum resin and oil, to achieve adjustable solidification speed and heat resistance, and improved granulability and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If polypropylene-based resins with specific melting endotherm and melting point are used, then solidification speed and heat resistance become adjustable, but the complexity of resin formulation increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the melting endotherm (ΔH-D) within 0-40 J/g and melting point (Tm-D) within 0-90°C ranges of polypropylene-based resin (A), along with its meso triad fraction (20-80 mol %) and meso pentad fraction (1-55 mol %). These parameter specifications enable systematic adjustment of solidification speed and heat resistance while maintaining formulation manageability through defined compositional boundaries.
2Strength
If components excellent in flexibility are used, then flexibility and elasticity recovery performance improve, but granulability deteriorates
Solution Approach 1:
The patent employs composite materials by combining polypropylene-based resin (A) with low crystallinity (0-40 J/g) providing flexibility and elasticity recovery, with polypropylene-based resin (B) having higher crystallinity (40-125 J/g) providing granulability. The specific composition ratio and crystallinity contrast create a composite structure where resin (A) content of 70-99.5% by mass ensures flexibility while the 0.5-30% by mass content of resin (B) maintains adequate granulability during processing.
3Reliability
If base polymer is changed to adjust hot-melt adhesive performance, then solidification speed and adhesion strength are improved, but the simplification of control technique is hindered
Solution Approach 1:
The patent applies parameter changes by controlling the melting endotherm (ΔH-D) of polypropylene-based resin (A) within 0-40 J/g and melting point (Tm-D) within 0-90°C, along with meso triad fraction (20-80 mol %) and meso pentad fraction (1-55 mol %). These parameter specifications enable systematic adjustment of solidification speed and adhesion strength while maintaining formulation manageability through defined compositional boundaries, eliminating the need to change base polymer types.
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 allows for adjustable solidification speed and heat resistance, while enhancing the flexibility and granulability of pellets and molded articles, making it suitable for various applications.
Implementation Method 1
a polypropylene-based resin (A) which has a melting endotherm (ΔH-D) of 0 J/g or more and 40 J/g or less and which does not exhibit an observable melting point (Tm-D) or has a melting point (Tm-D) of 0° C. or higher and lower than 90° C.
Implementation Method 2
by controlling the crystallinity of the base polymer, a hot-melt adhesive is adjusted so as to be applicable to various uses
Data Source
AI summary
A polypropylene-based resin composition containing a polypropylene-based resin (A) which has a melting endotherm (ΔH-D) of 0 J/g or more and 40 J/g or less and which does not exhibit an observable melting point (Tm-D) or has a melting point (Tm-D) of 0° C. or higher and lower than 90° C., and a polypropylene-based resin (B) which has a melting endotherm (ΔH-D) of more than 40 J/g and 125 J/g or less.