Sliding Composition Film for Corner Adhesion and Low-Friction Extrusion
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Solution Overview
Problem
Existing olefinic thermoplastic elastomer compositions used in glass run channels face issues with adhesion at corners, die drool, surface imperfections, and inadequate heat deterioration resistance and sliding properties, impairing processability and appearance.
Innovation Solution
A sliding composition comprising specific proportions of ethylene/α-olefin/nonconjugated polyene copolymer, propylene-based random and homopolymers, high-density and ultra-high molecular weight polyethylenes, and a silicone compound, with the copolymer cross-linked by a phenolic resin-based agent, to achieve balanced extrusion moldability, adhesiveness, and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a silicone-based additive and fine particles of polyethylene are contained in a thermoplastic elastomer composition, then sliding properties are improved, but adhesion at corners deteriorates and die drool adheres to the molding die
Solution Approach 1:
The patent changes the particle size parameter of polyethylene from fine particles to coarse particles with D50 of 100 μm or more, which fundamentally alters the interaction between the filler and the thermoplastic elastomer matrix. This parameter change prevents the fine particles from migrating to corners and adhering to the die, while still maintaining sliding properties through the silicone-based additive
Solution Approach 2:
The patent creates local quality differences by using coarse polyethylene particles that remain distributed within the bulk material rather than concentrating at corners. This localized distribution strategy ensures good adhesion at corners while maintaining sliding properties in the bulk material
2Ease of operation
If a silicone-based additive and fine particles of polyethylene are contained in a thermoplastic elastomer composition, then sliding properties are improved, but die drool adheres to the molding die
Solution Approach 1:
By changing the particle size parameter of polyethylene to D50 of 100 μm or more, the patent prevents die drool formation. The coarse particles do not migrate to the die surface during extrusion, eliminating the harmful die drool effect while maintaining sliding properties through the silicone-based additive
3Ease of operation
If a silicone-based additive and fine particles of polyethylene are contained in a thermoplastic elastomer composition, then sliding properties are improved, but surface imperfections with large recesses and protrusions occur
Solution Approach 1:
The patent changes the particle size parameter of polyethylene to D50 of 100 μm or more, which prevents surface imperfections. The coarse particles remain embedded within the material bulk and do not cause the large recesses and protrusions that fine particles create on the surface, while sliding properties are maintained through the silicone-based additive
4Ease of manufacture
If conventional thermoplastic elastomer composition is used, then processing is simplified, but heat deterioration resistance is insufficient
Solution Approach 1:
The patent creates a composite material system by combining thermoplastic elastomer with coarse polyethylene particles (D50 ≥ 100 μm) and silicone-based additive. This composite structure provides both good processability from the thermoplastic elastomer matrix and enhanced heat deterioration resistance through the stable polyethylene-silicone composite system
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 produces molded bodies with improved sliding properties, adhesiveness at corners, and enhanced heat deterioration resistance, while maintaining excellent extrusion moldability and appearance.
Implementation Method 1
the ethylene/α-olefin/nonconjugated polyene copolymer (A) is at least partially cross-linked with a phenolic resin-based cross-linking agent
Implementation Method 2
5.0 to 8.0% by mass of a silicone compound (D) having a kinematic viscosity of 3,000 to 1,000,000 cSt at 25° C.
Implementation Method 3
10.0% by mass or more of ultra-high molecular weight polyethylene (C2) having an intrinsic viscosity [η] of 10 to 40 dl/g, as measured in a decalin solvent at 135° C., an average particle size D50 of 22 to 50 μm
Data Source
AI summary
One aspect of the present invention relates to a sliding composition film or a method for producing a sliding composition, the sliding composition including an ethylene/α-olefin/nonconjugated polyene copolymer (A); a propylene-based random copolymer (B1) and a propylene homopolymer (B2), having a melt flow rate of 0.1 to 4.0 g/10 min; high-density polyethylene (C1) having a density of 940 to 970 kg/m3 and a MFR of 0.1 g/10 min or less; ultra-high molecular weight polyethylene (C2) having an intrinsic viscosity [η] of 10 to 40 dl/g (in decalin at 135° C.), an average particle size D50 of 22 to 50μm, and a density of less than 940 kg/m3; and a silicone compound (D) having a kinematic viscosity of 3,000 to 1,000,000 cSt (at 25° C.) in each predetermined content, in which the ethylene/α-olefin/nonconjugated polyene copolymer (A) is at least partially cross-linked with a phenolic resin-based cross-linking agent.