Specialty chemical company in Switzerland, Clariant Masterbatches has developed the new liquid vehicle technology (LVT) to eliminate problems that have prevented wider use of liquid color and additive concentrates in extrusion blow molding of polyolefins (high and low-density polyethylene and polypropylene).
The highly compatible systems allow for higher pigment loadings and lower usage rates, while eliminating past challenges related to screw slippage, according to initial testing in monolayer containers.
Clariant said improved resin compatibility results in good weld lines in the finished container as evidenced by scores in standard burst and compression-loading tests.
Clariant Masterbatches North America head of liquid color Raymond Sloan said extrusion blow molders and brand owners in the personal care and household products markets often find liquid masterbatches to be a good alternative to solid concentrates.
"However, until now, use of liquid color has been limited in blow molding of polyolefin resins because many liquid based carrier systems (including mineral oil) would not incorporate well with the resins. It was pigment friendly, but not resin friendly," Sloan added.
The new masterbatches use a liquid vehicle system that incorporates suspension aids, and binders have been incorporated into the new LVT masterbatches to allow for higher pigment loadings and lower usage rates.
The Clariant liquid products will assist in the formation of a strong seam and help to improve weld-line strength. The colors have a positive effect on material flow in the extruder.
