Butene-1 Polymer Composition for High Melt Flow Adhesives
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Solution Overview
Problem
Butene-1 polymers with high melt flow rates face challenges in achieving specific property profiles for various applications, such as hot-melt adhesives, due to the need for balancing crystallinity, molecular weights, and composition distribution, which are not adequately addressed by existing technologies.
Innovation Solution
A butene-1 polymer composition is developed by combining two butene-1 polymers with different comonomer contents, specifically up to 18% by mole, and a high fraction soluble in xylene at 0°C, without using free radical generating agents, to achieve a unique profile of properties including high melt flow rates, low hardness, and measurable crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If free radical generating agents like peroxides are used to increase MFR value, then melt flow rate is improved, but chemical contamination and unpleasant odor occur
Solution Approach 1:
The invention removes free radical generating agents from the polymerization process entirely, extracting the harmful element while maintaining the desired high MFR properties through alternative compositional design
Solution Approach 2:
The invention changes the approach from chemical modification (using peroxides) to physical/compositional modification (blending polymers with different comonomer contents and molecular weights) to achieve high MFR without contaminants
2Ease of operation
If butene-1 polymers with high melt flow rate are used, then fluidity in molten state is improved, but achieving specific property profiles for applications becomes difficult
Solution Approach 1:
The invention applies local quality by creating a composition with spatially distributed properties - combining polymer A with low comonomer content (higher crystallinity) and polymer B with high comonomer content (lower crystallinity, higher fluidity) to achieve different property profiles in different regions of the material
Solution Approach 2:
The invention creates a composite material system by blending two butene-1 polymers with different comonomer contents and molecular weight distributions, resulting in a composition that exhibits properties not achievable with a single polymer
3Duration of action of moving object
If comonomer content is increased to reduce crystallinity, then open time is improved, but MFR value decreases
Solution Approach 1:
The invention segments the polymer composition into two distinct polymer components with different comonomer contents, allowing each component to contribute different properties - one providing crystallinity and MFR, the other providing extended open time
Data Source
AI summary
A butene-1 polymer composition having MFR values of from 400 to 2000 g/10 min, measured according to ISO 1133 at 190°C with a load of 2.16 kg, comprising: A) a butene-1 homopolymer or a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of up to 5% by mole; B) a copolymer of butene-1 with one or more comonomers selected from ethylene and higher alpha-olefins, having a copolymerized comonomer content of from 6% to 25% by mole; said composition having a total copolymerized comonomer content from 5% to 18% by mole, referred to the sum of A) and B), and a content of fraction soluble in xylene at 0°C of 65% by weight or more, determined on the total weight of A) and B).