Thermoplastic Polyolefin Flooring Composition
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Solution Overview
Problem
Existing non-carpeted vehicle flooring materials face challenges with limited temperature range for thermoforming, increased gloss at higher forming temperatures, and inadequate stress whitening and low odor resistance, which do not meet automotive manufacturers' requirements for abrasion, scratch, and mar resistance.
Innovation Solution
A thermoplastic polymer blend composition comprising hydrogenated block copolymer, propylene homopolymer or copolymer, mineral oil, maleic anhydride grafted polymer, non-surface treated calcium carbonate filler, and optionally polydimethylsiloxane and nucleating agents, specifically designed for injection molding to enhance physical properties and reduce stress whitening and odor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high crystallinity polypropylene is used to improve scratch and mar resistance, then abrasion resistance is improved, but melt strength drops sharply during thermoforming
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating ethylene/α-olefin elastomers (20-80 wt%) and polypropylene (20-80 wt%) in specific ratios, along with nucleating agents and processing aids. This compositional parameter adjustment allows the material to maintain adequate melt strength during thermoforming while achieving the required scratch and mar resistance through controlled crystallinity development during processing.
2Ease of manufacture
If forming temperature is increased to improve processability, then thermoforming becomes easier, but gloss increases which does not meet requirements
Solution Approach 1:
The patent utilizes nucleating agents (0.1-5 wt%) to modify the crystallization behavior of the polymer blend. This allows the material to achieve proper crystallinity and mat surface finish at lower forming temperatures, thereby maintaining low gloss while still achieving adequate processability through controlled nucleation and crystallization kinetics rather than relying on high temperature alone.
3Strength
If elastomer composition is used to improve impact resistance, then flexibility is improved, but stress whitening increases
Solution Approach 1:
The patent creates a composite material system combining ethylene/α-olefin elastomers with polypropylene matrix, along with specific additives including nucleating agents and processing aids. This composite structure provides impact resistance through the elastomeric phase while the polypropylene matrix and controlled crystallization (via nucleating agents) minimize stress whitening by reducing crystalline defects and improving stress distribution.
4Reliability
If conventional TPO blends are used for thermoforming, then melt strength is improved, but they are not suitable for injection molding
Solution Approach 1:
The patent formulates a universal polymer blend composition that performs adequately across multiple fabrication methods including both thermoforming and injection molding. The specific composition ratios of ethylene/α-olefin elastomers to polypropylene, combined with nucleating agents and processing aids, provide balanced rheological properties that deliver sufficient melt strength for thermoforming while also enabling proper flow and packing characteristics for injection molding processes.
Data Source
AI summary
The present invention is directed to an elastomer composition comprising a hydrogenated block copolymer, a propylene polymer, a maleic anhydride grafted polymer, a mineral oil, a filler, and optionally a siloxane polymer and/or a nucleating agent. The inventive compositions are particularly suitable for fabricating injection molded non-carpet vehicle flooring.