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Kaneka MR-501 is a silicone-acrylic composite toughener, mainly for impact modification and chemical resistance improvement of engineering plastics. It has excellent room and low temperature impact performance, good thermal stability, little effect on substrate tensile, flexural and other physical properties, suitable for PC and other engineering plastic modification needs.
Silicone-acrylic composite system with excellent impact strength and thermal stability
Good impact resistance at 23℃ room temperature and low temperatures of -30℃/-40℃
Excellent retention of substrate tensile yield strength, flexural strength and modulus
Good chemical resistance, resistant to contact with chemicals such as glacial acetic acid
Good compatibility with PC substrate, no effect on the basic physical properties of the substrate after modification
Impact modification of PC, PBT, PC/ABS, PC/PBT and other engineering plastics as well as their alloys
Production of chemical equipment accessories requiring high and low temperature impact resistance and hydrolysis resistance
Toughening modification of flame-retardant PC/ABS alloy products
Preparation of engineering plastic structural parts and precision accessories under high-temperature processing conditions
Production of electronic and electrical parts, automotive engineering plastic parts used in outdoor and humid environments
| Product Information | |
| Product Name | Kaneka Silicone-Acrylic Solvent-Resistant Toughener MR-501 |
| Product Series | MR Series |
| Product Type | Silicone-Acrylic Composite Toughener |
| Appearance | Free-flowing white powder (conventional type) |
| Mechanical Properties (PC/MOD=100/5phr) | |
| Izod Notched Impact Strength (23℃) | 59.1 kJ/m² |
| Izod Notched Impact Strength (-30℃) | 43.5 kJ/m² |
| Izod Notched Impact Strength (-40℃) | 24.6 kJ/m² |
| Tensile Yield Strength | 52.9 MPa |
| Elongation at Break | 148.0 % |
| Flexural Strength | 85.6 MPa |
| Flexural Modulus | 2063 MPa |
| Chemical Resistance | |
| Chemical Resistance - Glacial Acetic Acid | Excellent (●) |
| Chemical Resistance - Sunscreen | Fair (△) |
| Chemical Resistance - Carbon Tetrachloride | Poor (×) |
| Performance & Compatibility | |
| Core Performance | Good thermal stability, excellent impact resistance |
| Compatibility | Good compatibility with PC substrate |
| Processing Performance | Good processability, adaptable to various molding processes |
Q1: What is the primary function of Kaneka MR-501 in polymer formulations?
A: Kaneka MR-501 is a methacrylate-based impact modifier designed to enhance toughness and ductility—particularly low-temperature impact resistance—of rigid thermoplastics such as PVC, polycarbonate, and certain engineering resins without significantly compromising stiffness or processability.
Q2: Is MR-501 compatible with unplasticized PVC (uPVC) compounds?
A: Yes, MR-501 is widely used in uPVC profiles, pipes, and window systems to improve impact strength and prevent brittle fracture during fabrication or service life, especially under cold conditions or mechanical stress.
Q3: How does MR-501 compare to traditional CPE or MBS impact modifiers?
A: Unlike chlorinated polyethylene (CPE) or methyl methacrylate–butadiene–styrene (MBS) modifiers, MR-501 offers superior thermal stability, excellent clarity retention in transparent applications, and no halogen content—making it suitable for applications where color stability, low volatility, and regulatory simplicity are priorities.
Q4: What is the typical dosage range for MR-501 in finished compounds?
A: MR-501 is typically used at low concentrations—generally ranging from 0.1% to 2% by weight—depending on the base resin, desired performance balance, and processing method. Optimal loading should be determined through formulation trials.
Q5: Does MR-501 require special handling or drying before processing?
A: MR-501 is supplied as a free-flowing powder with low moisture sensitivity. While not hygroscopic, standard best practices for thermoplastic additives apply—storage in dry, cool conditions and pre-blending with the base resin prior to extrusion or injection molding are recommended for uniform dispersion.
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