Liquid developers and methods thereof
AssigneeXerox Corporation
InventorsGeorge A. Gibson, Scott D. Chamberlain
Life of this patent
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Abstract
A mixed resin liquid developer and a process for the preparation of liquid developers comprised of a nonpolar liquid, a mixture of thermoplastic resin particles, a charge director, and a charge control agent, the process characterized by the addition of a first thermoplastic resin and a charge control agent, followed by adding to the product obtained a second thermoplastic resin.
Claims30
A process for the preparation of negatively charged liquid developers comprising a nonpolar liquid, a mixture of more than one thermoplastic resins, a charge director, and an aluminum charge control agent, wherein said process comprises melt mixing and reacting a first thermoplastic resin with said charge control agent, subsequently adding to the product obtained a second thermoplastic resin to prepare a mixture of the reaction product of said first thermoplastic resin withsaid charge control agent and said second thermoplastic resin, and subsequently dispersing said mixture and a charge director in nonpolar liquid to produce a negatively charged liquid developer.
A process for the preparation of liquid developers comprised of a nonpolar liquid, a mixture of thermoplastic resin particles, a charge director, and an aluminum charge control agent comprised of a component of the alternative formulas (a) or (b):
- ##STR8## wherein R.sub.1 is selected from the group consisting of hydrogen and alkyl, and n is a number 0 (zero), 1, 2, 3, or 4, wherein said process comprises melt mixing and reacting a first thermoplastic resin selected from the group consisting of a methacylic acid copolymer and an acrylic acid copolymer with said aluminum charge control agent, subsequently adding to a product obtained an ethylene vinyl acetate as a second thermoplastic resin to prepare a mixutre of the reaction product of said first thermoplastic resin with said charge control agent and said second thermoplastic resin, and subsequently dispersing said mixture and a charge director in nonpolar liquid to produce a negatively charged liquid developer.
A process for the preparation of liquid developers comprised of a nonpolar liquid, a mixture of thermoplastic resin particles, a charge director, and an aluminum charge control agent selected from the group consisting of aluminum salts of hydroxy carboxylic acids, aluminum salts of amino carboxylic acids, aluminum salts of aromatic sulfonic acids, aluminum salts of aliphatic carboxylic acids, aluminum salts of aromatic carboxylic acids, and mixtures thereof, wherein said process comprises melt mixing and reacting a first thermoplastic resin selected from the group consisting of a methacylic acid copolymer and an acrylic acid copolymer with said aluminum charge control agent, subsequently adding to a product obtained an ethylene vinyl acetate as a second thermoplastic resin to prepare a mixture of the reaction product of said first thermoplastic resin with said charge control agent and said second thermoplastic resin, and subsequently dispersing said mixture and a charge director in nonpolar liquid to produce a negatively charged liquid developer.
Dependencies are inferred from the claim text.