PA6/66 Cable Jacket Composition for UV Resistance Without Haze
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Solution Overview
Problem
Conventional polyamide compositions for wire and cable jacketing suffer from issues such as loss of transparency and deterioration of physical properties like tensile strength and elongation due to the incorporation of UV-stabilizing additives, which are typically immiscible, leading to increased haze and UV degradation.
Innovation Solution
Incorporation of a polyamide 6/66 copolymer with reduced crystallinity, combined with UV mitigation components, to achieve desirable transmission, haze characteristics, and retention of mechanical properties, including a polyamide composition with specific weight percentages of caprolactam and hexamethylene diamine adipate monomers, along with additives like UV stabilizers and lubricants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV mitigation components are incorporated into conventional polyamide compositions, then UV resistance is improved, but transparency is worsened due to increased haze
Solution Approach 1:
The patent changes the crystallinity parameter of the polyamide base resin by using polyamide 6/66 copolymer with reduced crystallinity compared to conventional polyamide 6 homopolymer. This parameter change creates more amorphous regions that can better accommodate UV mitigation components, reducing phase separation and minimizing haze while maintaining UV resistance
Solution Approach 2:
The patent uses a composite polyamide system combining polyamide 6/66 copolymer with specific UV mitigation components (HALS and/or UV absorbers). This composite approach creates a more homogeneous mixture where the copolymer matrix better integrates the additives, reducing optical defects while providing UV protection
2Reliability
If additives are incorporated into polyamide compositions, then functional properties are improved, but manufacturing processability is worsened due to immiscibility
Solution Approach 1:
The patent modifies the molecular structure parameter of the polyamide base resin by incorporating 6-moiety units from hexamethylene diamine adipate into the polyamide 6 chain. This structural parameter change improves compatibility and miscibility with various additives, enabling more homogeneous compounding and better processability during extrusion
3Ease of manufacture
If conventional polyamide compositions are used, then manufacturing simplicity is maintained, but optical properties are worsened due to loss of transparency
Solution Approach 1:
The patent changes the crystallinity and molecular structure parameters by using polyamide 6/66 copolymer instead of conventional polyamide 6 homopolymer. The copolymer's random distribution of 6-moiety units creates a more amorphous structure that provides inherent transparency and better accommodates additives, achieving optical properties without complicating the manufacturing process
Data Source
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AI summary
Polyamide compositions for use in forming wire or cable jacket compositions. The polyamide compositions include a component of polyamide 6/66 copolymer formed from substantially randomly distributed caprolactam monomers and hexamethylene diamine monomers. The polyamide 6/66 copolymer component may form the entirety of the polyamide composition or alternatively, the polyamide composition may include an amount of polyamide 6 homopolymer blended with the polyamide 6/66 copolymer component. The composition also includes one or more additives, such as at least one UV mitigation component which, due to the reduced crystallinity of the polyamide 6/66 copolymer component, is incorporated into the polyamide composition with desirable transmission and haze characteristics as well as providing for retention of physical properties such as tensile strength at break and elongation at break.