Butene-1 Polymer Composition High Melt Flow Rate
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Solution Overview
Problem
Butene-1 polymers with high melt flow rates face challenges in achieving a balanced profile of properties such as tensile strength, hardness, and crystallinity, particularly when used in films and fibers, due to variations in molecular weights and comonomer contents, and often require the use of free radical generating agents that introduce chemical contamination.
Innovation Solution
A butene-1 polymer composition with a melt flow rate of 100 to 300 g/10 min, achieved by combining butene-1 homopolymers or copolymers with specific comonomer contents and molecular weights, using a metallocene catalyst system, which avoids the need for free radical generating agents and enhances properties like low hardness, high elongation, and low glass transition temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If butene-1 polymers with high melt flow rate are produced using conventional methods, then fluidity in molten state is improved, but chemical contamination and unpleasant odor occur due to free radical generating agents
Solution Approach 1:
The patent changes the chemical parameters of the polymerization process by using metallocene catalysts instead of free radical generating agents, and by controlling comonomer content and molecular weight distribution to achieve high MFR without chemical contamination
Solution Approach 2:
The patent converts the conventional approach of using harmful free radical agents into a beneficial process by employing metallocene catalysts that eliminate contamination while achieving the desired high melt flow rate through controlled polymerization
2Ease of operation
If butene-1 polymers with high melt flow rate are produced, then fluidity is improved, but tensile properties and crystallinity deteriorate
Solution Approach 1:
The patent applies local quality by creating a bimodal or multimodal molecular weight distribution where different polymer fractions have different properties - some contributing to high MFR and others to tensile strength and crystallinity, achieving a balanced profile
Solution Approach 2:
The patent creates a composite polymer structure by combining butene-1 homopolymer or low-comonomer copolymer with higher-comonomer copolymer, where each component contributes different properties that complement each other in the final material
3Ease of operation
If comonomer content is increased to improve processability, then fluidity is improved, but mechanical properties deteriorate
Solution Approach 1:
The patent optimizes the comonomer content parameter within specific ranges (0.5-5 mol% for component A, 6-20 mol% for component B) to balance processability and mechanical properties, avoiding both too low and too high comonomer content
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 exhibits improved fluidity, tensile properties, and measurable crystallinity, suitable for films, fibers, and hot-melt adhesives, while eliminating chemical contamination from free radical agents, and can be blended with other polyolefins for enhanced performance.
Implementation Method 1
using a metallocene catalyst system
Implementation Method 2
melt flow rate of not less than 100 g/min., measured according to norm ISO 1133 with a load of 2.16 kg at 190 °C
Implementation Method 3
still retaining a measurable crystallinity
Data Source
AI summary
A butene-1 polymer composition having MFR values of from 100 to 300 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 20% by mole; said composition having a total copolymerized comonomer content from 4% to 15% by mole, referred to the sum of A) and B), and a content of fraction soluble in xylene at 0°C of 75% by weight or less, determined on the total weight of A) and B).