Propylene-Based Plastomer Adhesive Solidification Control
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Solution Overview
Problem
Adhesive compositions with polypropylene-based materials face challenges in achieving optimal solidification time and bond strength, as they either solidify too quickly or too slowly, affecting their utility in various applications.
Innovation Solution
A propylene-based plastomer or elastomer (PBPE) with specific properties, including a Koenig B-value less than 1.0, total unsaturation per mole of propylene from 0.010% to 0.030%, and melt viscosity between 5,000 mPa.s to 15,000 mPa.s, is used in combination with a propylene-based polymer wax to enhance solidification rate while maintaining suitable adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polypropylene-based adhesive compositions are used, then adhesive properties are maintained, but solidification time is either too quick or too slow affecting utility
Solution Approach 1:
The patent applies parameter changes by precisely controlling the ethylene content (5-15 wt%), Koenig B-value (0.3-1.0), density (0.855-0.885 g/cc), and molecular weight (20,000-50,000 g/mol) of the PBPE to optimize the balance between adhesion and solidification rate. These parameter adjustments allow the adhesive to maintain reliable bonding while achieving appropriate solidification timing for processing
Solution Approach 2:
The patent uses composite materials by combining PBPE with propylene-based polymer wax in a specific formulation. This composite approach allows the adhesive composition to simultaneously achieve good adhesion properties from the PBPE and controlled solidification rate from the wax component, resolving the contradiction between maintaining adhesive performance and optimizing solidification time
2Productivity
If solidification rate is increased, then processing speed improves, but bond strength may be insufficient for further processing
Solution Approach 1:
The patent optimizes processing speed while maintaining bond strength through parameter changes in the PBPE formulation, specifically controlling molecular weight (20,000-50,000 g/mol) and melt viscosity (5,000-15,000 mPa·s at 177°C). These parameters enable faster solidification for improved productivity while preserving sufficient bond strength for subsequent processing operations
3Loss of time
If solidification time is reduced, then manufacturing efficiency increases, but ability to form meaningful adhesive bond is affected
Solution Approach 1:
The patent resolves this contradiction through parameter changes in the PBPE structure, specifically optimizing ethylene content (5-15 wt%) and Koenig B-value (0.3-1.0) to achieve reduced solidification time while maintaining the ability to form meaningful adhesive bonds. The controlled density (0.855-0.885 g/cc) further ensures proper bonding characteristics despite faster solidification
Solution Approach 2:
The patent employs composite materials by formulating PBPE with propylene-based polymer wax, where the wax component modulates solidification rate while the PBPE maintains adhesive bonding capability. This composite formulation enables reduced solidification time without compromising adhesive bond quality
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 PBPE composition with propylene-based polymer wax achieves a reduced solidification time and maintains suitable adhesion properties for nonwoven fabric applications, allowing for rapid processing and effective bonding during manufacturing.
Implementation Method 1
The propylene-based polymer wax helps to increase the rate of solidification of the composition
Data Source
Figure 1
AI summary
The present disclosure provides an adhesive composition. The adhesive composition includes: A) a propylene based plastomer or elastomer (PBPE) comprising up to 15 wt % units derived from ethylene and having (i) a Koenig B-value less than 1.0; (ii) a total unsaturation per mole of propylene from 0.010% to 0.030%; (iii) a density from 0.860 g/cc to 0.890 g/cc; (iv) a melt viscosity at 177°C from 1,000 mPa.s to 15,000 mPa.s; and (v) a weight average molecular weight from 20,000 to 50,000 g/mole.