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Polystyrene resins valuable in large and small appliances alike.

Using a new technology for the production of high-impact polystyrene polystyrene (pŏl'ēstī`rēn), widely used plastic; it is a polymer of styrene. Polystyrene is a colorless, transparent thermoplastic that softens slightly above 100°C; (212°F;) and becomes a viscous liquid at around 185°C;  (HIPS), Dow Chemical Company The Dow Chemical Company (NYSE: DOW TYO: 4850 ) is an American multinational corporation headquartered in Midland, Michigan. Overview
The Dow Chemical Company is currently the second largest chemical manufacturer in the World (after BASF)[1].
, Midland, MI, is producing a family of resins called STYRON A-TECH advanced technology polystyrene.

"Products in this new series will balance various properties, such as toughness, gloss, stiffness or flow, in combinations not previously available in polystyrene," said Jeff Denton, global market manager of polystyrene.

Customers should realize better overall value in injection-molded, extruded and thermoformed parts. Potential uses for these resins include a range of existing and developing polystyrene applications, such as large appliances, small appliances Small appliance refers to a class of home appliances that are semi-portable or which are used on tabletops, countertops, or other platforms. Such items are contrasted with major appliances, which are typically fixtures that cannot be easily moved. , toys, consumer electronics and packaging.

"We developed this resin to give our customers an unmatched combination of toughness and high gloss to achieve success in a variety of injection-molded applications such as small appliances, lawn and garden equipment, refrigerator accessories and consumer electronics," said Denton.

The 1110 resin delivers outstanding gloss and aesthetics, with Gardner Gloss levels up to 95%. The gloss gradient of STYRON A-TECH 1110 resins is typically lower than standard high-gloss HIPS, and can equal ABS resins at higher mold temperatures. The new resin can be molded with smooth or textured finishes. In addition, parts molded with STYRON A-TECH 1110 resin are compatible with finishing, adhesive and bonding techniques used with polystyrene, and may be painted to achieve specialized surface aesthetics.

Injection molded properties include impact strength of 5.0 ft.-lb./in. notched Izod at 73[degrees]F (ASTM ASTM
American Society for Testing and Materials
 D-256) and Gardner Impact greater than 330 in.-lb. at 73[degrees]F (ASTM D-3029). In practical-use testing at room temperatures, the 1110 polystyrene breaks in a ductile ductile /duc·tile/ (duk´til) susceptible of being drawn out without breaking.

Easily molded or shaped.


susceptible of being drawn out without breaking.
 manner, like ABS, rather than the brittle (jargon) brittle - Said of software that is functional but easily broken by changes in operating environment or configuration, or by any minor tweak to the software itself. Also, any system that responds inappropriately and disastrously to abnormal but expected external stimuli; e.  breakage associated with standard high-gloss HIPS.

In addition to substantial impact strength and high gloss, the 1110 resin provides consistent injection molding injection molding
A manufacturing process for forming objects, as of plastic or metal, by heating the molding material to a fluid state and injecting it into a mold.
 processability that can potentially reduce cycle time and energy costs in the molding process. This resin has a melt flow rate of 3.0g/10 min. (200[degrees]C/5kg), which allows for fast injection times and the ability to fill large, complex, thin-walled parts, enabling design flexibility. Further processing advantages include a low capillary capillary (kăp`əlĕr'ē), microscopic blood vessel, smallest unit of the circulatory system. Capillaries form a network of tiny tubes throughout the body, connecting arterioles (smallest arteries) and venules (smallest veins).  melt viscosity (lower than high gloss ABS at comparable shear rates Shear rate is a measure of the rate of shear deformation:

For the simple shear case, it is just a gradient of velocity in a flowing material.
), which allows the STYRON A-TECH 1110 to be processed with lower molding pressures.

This resin requires no drying and has an inherent natural, white color that makes it suitable for use with in-house coloring systems. Due to its natural color, the resin may require low levels of concentrate to achieve desired color. "In applications moving from ABS resins to STYRON A-TECH 1110 polystyrene, customers will see cost efficiencies related to resin price, processing ease and coloring options," said Denton.
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Author:Richards, Frances
Date:Oct 1, 1999
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