Starve fed emulsion polymerization process

Details Starve fed emulsion polymerization process Starve fed emulsion polymerization process

1994-06-22

1995-08-22

Zitomer, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

430137, 524418, 524461, 526 80, 526 81, 526 82, 526 85, 526 86, 526 87, 526347, 526 84, C08F 1208, C08F 242, C08F 224

Patent

active

054441404

ABSTRACT:
Simultaneous control of the molecular weight and the molecular weight distribution in the production of toner resins can be accomplished by using a starve fed emulsion polymerization process, which includes: selecting a desired molecular weight and molecular weight distribution of the polymer resin; determining a starve fed fraction to achieve the desired molecular weight and molecular weight distribution; and charging a reaction vessel with a chain transfer agent and a first monomer emulsion, and polymerizing monomer in the first monomer emulsion while simultaneously adding to the reaction vessel additional monomer, in the form of a second monomer emulsion, and additional chain transfer agent. The resins thus produced may be used in dry toners, liquid developers and inks suitable, for example, for ink jet applications.

REFERENCES:
patent: 3498938 (1970-03-01), Grommers et al.
patent: 4628071 (1986-12-01), Morgan
patent: 4946891 (1990-08-01), Devona et al.
patent: 5104923 (1992-04-01), Steinwand
Li et al. "Semi-Batch Processes for Emulsion Polymerization," Polymer International (1992) 29, No. 1, 41-46.
Snuparek and Krska, "Semicontinuous Emulsion Copolymerization of Styrene and Butyl Acrylate," Journal of Applied Polymer Science, vol. 20, No. 7, pp. 1753-1764 (1976).
Garcia-Rejon et al., "Semicontinuous Emulsion Copolymerization of Butyl Acrylate-Styrene," Chemical Engineering Community, vol. 24, vol. 1, pp. 71-92 (1983).

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