“A profound step change in providing higher impact resistance in combination with high gloss” is how Dow Chemical Co. describes its new Paraloid KM-X100 impact modifier for PVC window profiles. This weatherable, all-acrylic modifier from Dow’s new Rohm and Haas subsidiary in Philadelphia incorporates process-aid functionality. It reportedly allows lower use levels for cost reduction, provides a wider process window for lower melt temperatures, and also provides fast fusion for higher output rates. Use levels of 4 phr or less are said to provide excellent impact and gloss.
Another new acrylic impact modifier is Durastrength 619 from Arkema Inc., Philadelphia. It’s said to be more efficient than other acrylic modifi ers or CPE, permitting lower formulation costs in all outdoor weatherable rigids. This free-flowing powder reportedly provides excellent processability without processing aids.
Arkema’s PVC Additives Group also has three new butyltin heat stabilizers for pipe and rigid profiles. The newest is Thermolite 140 for coextruded siding and fence substrate and all types of pipe and conduit. It confers color stability to products stored in warm climates. It’s described as “one stabilizer that fits all” applications at the same use levels as higher-priced stabilizers with higher tin levels.
Also quite new is Thermolite 150 for high-output extrusion of window profiles and other demanding rigid applications. It reportedly can save money when used at the same levels as higher-cost, higher-tin stabilizers.
Cost savings are also possible by lowering tin content with two other new stabilizers. Thermolite 130 and 135 permit use of one stabilizer for all sorts of pipe from thinwall, high-shear products to large diameters. Thermolite 135, which has higher tin content than Thermolite 130, is also recommended for electrical and telephone conduit.
(215) 592-3000 • www.rohmhaas.com
(800) 558-5575 • www.additives-arkema.com
Rohm and Haas Co.
P.O. Box 1310 Philadelphia, PA 19106