Process for grafting polymers on carbon black through free radic

Details Process for grafting polymers on carbon black through free radic Process for grafting polymers on carbon black through free radic

1975-04-02

1977-03-29

Derrington, James H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106307, 260 304R, 260 324, 260 336PQ, 260 336UA, 260 338UA, 260 4253, C08K 304

Patent

active

040148440

ABSTRACT:
A process for grafting polymers on carbon black through a free radical mechanism comprising contacting of the black with the polymer and a thermal treatment.
After formation of the carbon black mixture with at least one polymer, said mixture is degassed under vacuum at approximately room temperature, at least one substance acting as a solvent for said polymer is then introduced on said degassed mixture which is under vacuum, so as to form a solution of the latter containing the carbon black, said solution is heated with stirring at least at 50.degree. C until a carbon black bearing polymer grafts is obtained and the latter can, if desired, be separated by filtration or centrifugation of the unattached polymer solution.
The carbon black products bearing polymer grafts as well as this carbon black itself are easily dispersed in solvents. They find valuable applications in paints, varnishes, printing inks, among others. The increase in dispersibility of the grafted carbon black improves its efficiency as a pigment, ultraviolet screening agent, filler, antioxidant, and the like.

REFERENCES:
patent: 3297466 (1967-10-01), Herman et al.
Kargin et al., Polymerization and Grafting Process on Freshly Formed Surfaces, in J. Polym. Sci., 52, 155, 1961.

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