High MFR Polypropylene Compositions with Fillers
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Solution Overview
Problem
Existing polypropylene compositions with fillers and/or pigments face challenges in achieving a balance of high Melt Flow Rate (MFR) and favorable mechanical properties, particularly when loaded with significant amounts of fillers and pigments, which affects processability and mechanical performance.
Innovation Solution
The development of polypropylene compositions comprising high MFR propylene polymers blended with fillers and/or pigments, using propylene homopolymers or copolymers with MFR values between 500 to 2500 g/10 min, along with optional compatibilizers, to achieve enhanced mechanical properties and improved processability, including higher flexural modulus, impact resistance, and reduced cycle times in injection molding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If propylene polymers with high MFR values are used to increase melt flow rate, then processability and ability to fill mold cavities improve, but mechanical properties deteriorate
Solution Approach 1:
The patent changes the MFR parameter of the propylene polymer to a very high range (500-2500 g/10min) and optimizes the filler content range (20-80 wt%) to achieve a balance where the extreme high flowability enables complete mold cavity filling while the specific parameter combination maintains acceptable mechanical properties
Solution Approach 2:
The patent creates a composite material system combining high MFR propylene polymer with specific fillers (glass fibers, talc, calcium carbonate) and optional compatibilizers, where the synergistic interaction between components achieves both high processability and maintained mechanical performance
2Quantity of substance
If significant amounts of fillers and pigments are added to polypropylene compositions, then cost and functionality improve, but processability and mechanical performance deteriorate
Solution Approach 1:
The patent uses extremely high MFR propylene polymer (500-2500 g/10min) as the base matrix, which enables the system to process very high filler loadings (20-80 wt%) while maintaining good flowability and complete mold filling, a capability not achievable with conventional lower MFR polymers
3Productivity
If degradation treatments are applied to increase MFR values, then melt flow rate improves, but polymer quality and mechanical properties deteriorate
Solution Approach 1:
The patent performs the MFR optimization action during the polymerization process itself, producing propylene homopolymers or copolymers with inherently very high MFR values (500-2500 g/10min) directly from synthesis, thereby achieving high flowability without subsequent degradation treatments that would compromise polymer quality
Solution Approach 2:
The patent converts what would normally be considered an extreme parameter (very high MFR of 500-2500 g/10min) into a beneficial feature that enables both high filler loading and good processability, turning the potential disadvantage of high flow into a dual benefit when combined with the specific filler ranges
Data Source
AI summary
Polypropylene compositions having a MFR value (2.16 kg, 230° C.) from 15 to 200 g/10 min., comprising:A) a propylene polymer or polymer composition selected from propylene homopolymers or copolymers of propylene containing up to 5% by moles of comonomer(s), said homopolymers and copolymers having values of MFR, obtained without degradation treatments, from 500 to 2500 g/10 min., or combinations of the said homopolymers or copolymers;B) a filler or pigment, or their combinations; and optionallyC) from 0.5 to 5% by weight, with respect to the total weight of A), B) and C), of a compatibilizer.