Canadian Plastics

Antioxidant allowed in more food-contact applications

Canada's Bureau of Chemical Safety has broadened the food contact sanction for Doverphos S-9228 antioxidant to allow its use in all polymers, except LDPE and LLDPE, at temperatures up to 100 C, with ...

April 1, 2000   Canadian Plastics



Canada’s Bureau of Chemical Safety has broadened the food contact sanction for Doverphos S-9228 antioxidant to allow its use in all polymers, except LDPE and LLDPE, at temperatures up to 100 C, with no limitations on types of food.

The new sanction also covers Doverphos S-9228 T.

Doverphos S-9228 is a high-performance solid phosphite antioxidant with high molecular weight, low volatility and high phosphorous content.

Dover Chemical Corp. 330/343-7711

TPEs flexible at extremely low temperatures

A technology breakthrough by Advanced Elastomer Systems enables new grades of Santoprene 7000 thermoplastic elastomers to maintain reliable performance at temperatures as low as -80C. The new grades have favorable compression recovery in dynamic applications at temperatures as low as -40C.

The Santoprene 7000 materials have the lowest glass transition temperature of an olefinic TPE available. Grades ranging in hardness from 60 Shore A to 40 Shore D are available.

The first commercial grade will be used in automotive CVJ boots this year.

Advanced Elastomer Systems 330-849-5000

TPE may substitute for silicone

AlphaGary has introduced a new product technology touted as a cost-effective replacement for silicone in disposable medical devices.

The Evoprene Super G range of styrenic-based thermoplastic elastomers is a possible alternative for molding and extrusion applications where thermoset silicone is the most ideal material. The Evoprene materials have superior compression set properties, very good temperature resistance and improved tensile strength properties.

AlphaGary Canada 905/662-5735

Tough TPE resists chemicals

Riteflex thermoplastic elastomers from Ticona combine excellent fatigue and chemical resistance with low temperature impact strength.

The material is suitable for applications with a temperature range of -40 F to 250 F (-40 C to 121 C). Extrusion and injection grades are available from 35 to 77 Shore D hardness. Suggested applications are hose and tubing, belts, energy absorbing devices, electrical/electronic connectors, film and sheet, and polymer modification.

Ticona 800/833-4882

Acrylic for DVD reduces cycle time

According to Elf Atochem, Plexiglas VOD-100 acrylic molding resin has many advantages for the bulk replication of digital video disks (DVDs).

The exceptionally low birefringence of Plexiglas acrylic resin eliminates a process restraint and opens the door to improved signal quality and reduced cycle time, the company states. In addition, the acrylic material is said to have higher scratch resistance and greater light transmission than polycarbonate.

Elf Atochem North America Inc. 215/419-7148

Glass flake boost flame retardance

Research and testing have shown that a new, thinner glass flake produced by Glassflake Ltd. acts as an intumescent, improving flame and fire retardancy properties in thermoplastics and thermosets.

In addition, the product offers better impact and weld strength, and outstanding weathering properties.

Glassflake Ltd. 113 2703615

Compounds make colors shimmer

RTP Company has developed a range of precolored compounds for injection molding and sheet extrusion that display geometric metamerism, sometimes referred to as the “chameleon effect”. This effect is achieved with a precise combination of dyes that cause a color to change when viewed at different angles.

According to Chip Hayes, product manager for precolored compounds, the high-chroma colors produce a shimmer effect in thermoplastic compounds. Says Hayes: “When viewed from one angle the part looks blue. Turn it slightly, and the part looks purple or maroon.”

Achieving this special effect with precolored compounds offers processors advantages over using a concentrated masterbatch. “It’s very difficult to predict how these pigments in a masterbatch format will interact with the rest of the formulation,” notes Hayes.

RTP Company 507/454-6900

Moisture-cured copolymers ideal for low-voltage cable

The Aquathene line of moisture-crosslinkable, polyolefin copolymer materials from Equistar Chemicals, LP, are based on directly polymerized copolymers of ethylene and vinylsilane. The product line, which is ideal for low-voltage power cable insulation, includes an ethylene-vinylsilane (EVS) copolymer resin, Aquathene AQ 120-000 (a natural resin), Aquathene CM 92949 (a black masterbatch) and a crosslinking catalyst masterbatch, Aquathene CM 04482.

Aquathene EVS products can be processed on standard thermoplastic extruders. The crosslinking reaction begins immediately upon exposure to moisture.

Equistar Chemicals, LP 713/652-7300


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