Cable Jacket Coating Blend for Smooth Extrusion and Strength
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Solution Overview
Problem
Ethylene-based polymer cable jackets with an I21/I2 ratio less than 50 exhibit poor processability and surface roughness during extrusion, limiting their application in cable manufacturing compared to broader molecular weight distribution gas phase polymerization resins.
Innovation Solution
A coated conductor with an outermost coating comprising an ethylene-based polymer having an I21/I2 ratio from 20 to 50 and a propylene/ethylene copolymer with a Mw/Mn ratio from 2.0 to 3.5, which improves surface roughness to 20-100 μ-inch while maintaining suitable mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ethylene-based solution resins with I21/I2 ratio less than 50 are used, then mechanical properties are sufficient, but surface roughness becomes unacceptable during extrusion
Solution Approach 1:
The patent changes the molecular weight distribution parameters of the ethylene-based polymer by specifying an I21/I2 ratio between 20-50, which fundamentally alters the polymer's flow characteristics during extrusion. This parameter change enables the material to achieve both adequate mechanical properties and acceptable surface roughness (20-100 μ-inch) that was previously unattainable with conventional resins having I21/I2 ratios below 50
Solution Approach 2:
The patent creates a composite polymer system by blending ethylene-based solution resin with specific molecular weight distribution (I21/I2 = 20-50) and propylene/ethylene copolymer. This composite material combines the mechanical strength of solution resin with the improved processability and surface finish characteristics of the copolymer, resolving the contradiction between mechanical properties and surface roughness
2Manufacturing precision
If broader molecular weight distribution gas phase polymerization resins are used, then surface roughness improves during extrusion, but mechanical properties deteriorate compared to solution resins
Solution Approach 1:
The patent optimizes the molecular weight distribution parameters by specifying propylene/ethylene copolymer with Mw/Mn ratio between 2.0-3.5 and controlling the blend composition. This precise parameter control allows the composite material to achieve superior surface roughness (20-100 μ-inch) while maintaining mechanical properties through the synergistic effect of the blended components
Solution Approach 2:
The patent develops a composite material system that blends ethylene-based solution resin (I21/I2 = 20-50) with propylene/ethylene copolymer (Mw/Mn = 2.0-3.5). This composite approach allows the material to inherit the mechanical strength from the solution resin component while gaining the excellent surface finish and processability from the copolymer component, thereby resolving the contradiction between surface roughness and mechanical properties
Data Source
AI summary
The present disclosure provides a coated conductor. The coated conductor includes a conductor and an outermost coating on the conductor. The coating includes (A) an ethylene-based polymer having an I21/I2 ratio from 20 to 50; and (B) a propylene/ethylene copolymer having a Mw/Mn from 2.0 to 3.5. The coating has a surface roughness from 20 μ-inch to 100 μ-inch.