Impact-Modified Polycarbonate/Polyester Blends
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Solution Overview
Problem
Conventional polymer blends of polycarbonate with polyester and/or polyamide often compromise on impact strength when increasing the levels of polyester and/or polyamide, requiring additional impact modifiers to maintain performance.
Innovation Solution
A thermoplastic polymer blend comprising 40-98% polycarbonate and 2-60% impact modifier blend, with the impact modifier blend consisting of a core-shell copolymer and functionalized polyolefin, allowing for higher polyester and/or polyamide content without sacrificing impact strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher levels of polyester and/or polyamide are blended with polycarbonate, then chemical resistance and cost are improved, but impact strength deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the impact modifier composition - specifically using a blend of core-shell copolymer (5-30 wt%) and functionalized polyolefin (70-95 wt%). This changed parameter composition of the impact modifier enables the system to accommodate higher polyester/polyamide content (25-65 wt%) while maintaining impact strength through optimized interaction between the modified impact modifiers and the polymer blend matrix.
Solution Approach 2:
The patent employs composite materials by creating a multi-component impact modifier system combining core-shell copolymer and functionalized polyolefin. This composite approach allows the functionalized polyolefin to provide enhanced compatibility with polyester/polyamide phases while the core-shell copolymer contributes to impact energy absorption, thereby maintaining impact strength even at higher polyester/polyamide blend levels.
2Ease of manufacture
If higher levels of polyester and/or polyamide are blended with polycarbonate, then cost is reduced, but impact strength deteriorates
Solution Approach 1:
The patent changes the parameters of the impact modifier system by incorporating functionalized polyolefin (70-95 wt%) which provides cost-effective compatibility enhancement. This parameter modification allows higher polyester/polyamide content (economical components) to be used while maintaining impact strength through the synergistic action of the modified impact modifier blend.
Solution Approach 2:
The functionalized polyolefin acts as an intermediary that improves compatibility between the polycarbonate matrix and polyester/polyamide blend. This intermediary component facilitates better dispersion and interfacial adhesion, enabling higher levels of cost-effective polyester/polyamide to be incorporated without sacrificing impact performance.
3Quantity of substance
If conventional impact modifiers are used with higher polyester/polyamide content, then cost is reduced, but impact strength deteriorates
Solution Approach 1:
The patent uses a composite impact modifier material consisting of core-shell copolymer and functionalized polyolefin. This composite structure enables the system to accommodate higher polyester/polyamide quantities (25-65 wt%) while maintaining impact strength, as the functionalized polyolefin provides phase compatibility and the core-shell copolymer provides impact energy dissipation mechanisms.
Solution Approach 2:
The patent changes the compositional parameters of the impact modifier to 5-30 wt% core-shell copolymer and 70-95 wt% functionalized polyolefin. This parameter optimization allows the system to incorporate higher quantities of polyester/polyamide while maintaining adequate impact strength through enhanced interfacial interactions in the modified blend system.
Data Source
AI summary
The invention relates to impact-modified polymer compositions, containing a polymer blend of polycarbonate with polyester and/or polyamide, plus an impact modifier blend of core/shell and functional polyolefin impact modifiers. The impact modifiers can provide the polymer blend composition with improved impact strength at equivalent loading, and also allow for higher amounts of polyester and/or polyamide in the blend without sacrificing impact strength.