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Riverdale Offers Light Stabilizer Grades for Improved Resins Quality

Published on 2017-08-10. Author : SpecialChem

Gravimetric Stand in Use
Riverdale Gravimetric Stand
+Shield™ Light Stabilizers make possible lower and more precise dosing than pellet masterbatch and disperse more uniformly in the polymer melt.

Diverse UV light stabilizers from Riverdale Global come in liquid form, providing lower additive costs than pellet masterbatch and improved end-product quality.

+Shield™ Light Stabilizers

+Shield™ light stabilizers are available in seven standard grades for use in injection molding, blow molding, and extrusion.

Depending on grade, they are recommended for use with:
  • Polyolefins
  • Styrenics
  • PET
  • TPEs
  • Engineering thermoplastics

Four of the grades are FDA-approved, and two of these can also be used as UV absorbers in packaging applications.

The economic and product-quality advantages of +Shield light stabilizers over pellet masterbatch result from the lower and more precise dosing made possible by their liquid form and their improved rate of dispersion in the polymer, according to Charles B. Irish, vice president of product development.

Also available for use with +Shield light stabilizers is the Riverdale Gravimetric Stand (RGS), in which a liquid-containing drum is mounted on a self-calibrating loss-in-weight scale that continually reports the weight of the contents to the controller as a means of ensuring that the target let-down ratio is maintained. “Use of Riverdale Global’s gravimetric metering system provides an additional level of precision, allowing for controlled conditions over the entire production run,” said Mr. Irish.

+Shield light stabilizers are available in pails or drums, in custom blends with liquid colors, or as one of the GlobalPlus™ range of liquid additives.

GlobalPlus products are single-additive liquid dispersions designed for processors who run clear or natural resins or who need to supplement the additive packages in pre-compounded or masterbatch materials.

In the GlobalPlus system, each additive is supplied in a drum with a built-in pump that stays sealed from the moment it arrives at the processor’s loading dock, through storage, handling, and metering into the process, and during return to Riverdale Global for replenishment.

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Source: Riverdale
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