Coupling agents & dispersants | additives feature
come close, more so than with most alternatives. Grades 32-441 and 32-440 incorporate complex
chemistries, Paulo says, and have a premium price. Their total cost benefi ts justify the price, he adds. Grade 11-100, in contrast, is competitively priced. Dispersants are also a focus of development at Cray
Valley, a division of Total. Grades include Ricon MA, which improves the dispersion of ATH and MDH fl ame retardants in compounds. Anthony Marozsan, global business development manager, says that the material, which is based on the company’s established malein- ized polybutadiene chemistry, improves fl ame-suppres- sion properties by exposing more of the FR additive to the surface of the material, where it can more effi ciently release moisture in a fi re. Ricon MA has an additional benefi t in that it reduces
the potential for property trade-offs by making a “less severe impact on mechanical properties” than might be experienced with competitive dispersants, Marozsan adds. The material, which is solely for dispersion of FRs, is typically used at loadings of 2 to 5%. The company also supplies SMA 93, a styrene/maleic anhydride-based chain extender for glass-fi bre-rein-
forced com- pounds. The benefi ts of this additive, Marozsan explains, include improved impact strength and tensile properties. Most conven- tional additives increase impact strength but degrade tensile performance.
Reinvigorating recyclates One major supplier of compatibilizers for recycling is DuPont. It is modifying grades of its ethylene copolymer and terpolymer-based resins to compatibilize immiscible resins during compounding. Three materials form the core of the company’s efforts in this area: Fusabond, a line of maleic anhydride-graft- ed polyolefi n copolymers; Elvaloy, which comprises polyethylene (PE) terpolymers that are made up of PE and reactive comonomers and epoxy groups, along with ethylene acrylate copolymers; and Entira EP, ethylene
New coupling agents improve the ability of
wire and cable sheathing to resist water and manage voltage loads
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