Siloxane Masterbatches
Siloxane additives are highly effective internal and external lubricants. These plastic additives offer a number of significant processing advantages and surface improvements such as scratch and abrasion resistance while reducing friction.

Unlike conventional silicone-based materials, they are ultra high molecular weight polymers (>15 million cSt) dispersed with an average particle size of 5 microns in various thermoplastics. They overcome the handling problems and surface adhesion difficulties that have prevented the widespread use of lower molecular weight forms of plastic additives in the industry.

The ultra high molecular weight nature of the siloxane polymer component of the Siloxane Masterbatches eliminates blooming as well as migration, which could be experienced when using lower molecular weight fluids or organic additives.

These unique masterbatches are typically used:

• to modify the surface of finished plastic parts for friction management
• to improve mar resistance and wear resistance
• as process aids to increase melt flow for cycle time reduction

Low concentrations (0.1-1.0%) of these siloxane masterbatches offer:

• increased compounding efficiency
• improved polymer flow and mold filling
• cycle time reduction
• lower extruder torque

Concentrations of 1-5% siloxane can facilitate easier mold release and provide significantly improved surface properties, including:

• better lubricity
• improved gloss and slip
• improved mar resistance and scratch resistance

The masterbatch can significantly reduce the coefficient of friction of a polymer without affecting post-finishing operations such as printing, plating, and painting.

Multibase offers siloxane masterbatches in a solid form (pelletized) for easy handling as an additive in compounding or downstream in the process.

How To Use Siloxane Masterbatches

Case Studies:
(Downloading case studies requires Adobe Acrobat Reader. Click here to download.)

• Blow molding of HDPE bottles with siloxane masterbatches
• Siloxane masterbatch for thermoplastics molding and extrusion
• Siloxane masterbatch improves demolding in a plastic housing for a KODAK camera
• Siloxane masterbatch improves performance in plastic compression fitting
• Siloxane masterbatch improves processing and demolding of automotive lamp holder
• Siloxane masterbatch minimizes friction in fibre optic cable conduit
• Siloxane masterbatches for molding polypropylene and thermoplastic olefins

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Click here for Masterbatch material data sheets.

Dow Corning is a registered trademark of Dow Corning Corporation.

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