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AssigneeMilliken & Company
InventorsJusong Xia, Mark E. Ragsdale, Eric B. Stephens
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A new and useful nonaqueous liquid pigment dispersion is provided which is easy to handle and produces thorough and effective colorations within target media, particularly as compared to standard solid pigments or high-viscosity liquid pigment dispersions. More specifically, the present invention relates to liquid pigment dispersions possessing viscosities of at most 5,000 centipoise at standard temperature and pressure. Such a low viscosity is obtained through the addition of relatively low amounts of aprotic viscosity modifiers possessing dipole moments of at between about 1.0 and 5.0, alternatively measured in terms of a flash point between about −20° C. and 180°, such as, most preferably cyclic carbonates. The resultant low-viscosity pigment compositions thus can be incorporated into any standard pigment-coloring method (such as, for example, polyurethane, polyolefin, and the like) without the problems associated with traditionally utilized solid or thickened, high viscosity pigment materials. The method of coloring such target media is also encompassed within this invention.
A nonaqueous liquid dispersion consisting essentially of at least one polyol, at least one pigment, and at least one aprotic viscosity modifying compound exhibiting a dipole moment of between about 1.0 and 5.0 or, alternatively, exhibiting a flash point of between about −20° C. and 180° C.
A nonaqueous liquid dispersion consisting essentially of at least one polyol, at least one carbon black pigment, and at least one aprotic viscosity modifying compound exhibiting a dipole moment of between about 1.0 and 5.0 or, alternatively, exhibiting a flash point of between about −20° C. and 180° C.
Dependencies are inferred from the claim text.