Quaternary ammonium salts as charge-control agents for toners and developers
AssigneeEastman Kodak Company
InventorsJohn C. Wilson, Dinesh Tyagi
Life of this patent
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Abstract
New electrostatographic toners and developers are provided containing charge-control agents comprising certain quaternary ammonium salts having good thermal stability and good charging characteristics. The quaternary ammonium salts are: N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)alkyl]ammonium salt or a quaternary N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)aryl]ammonium salt having the structure: ##STR1## wherein the substituents are as defined herein.
Claims10
A dry, particulate electrostatographic toner composition comprising a polymeric binder and a charge-control agent comprising a quaternary N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)alkyl]ammonium salt or a quaternary N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)aryl]ammonium salt having the structure:
- ##STR6## wherein R.sub.1 and R.sub.2 are tert-alkyl containing from 4 to 8 carbon atoms
- R.sub.3 is alkyl, aryl or aralkyl;
- R.sub.4 is alkyl, aryl, aralkyl or ##STR7## R.sub.5 is alkyl, aryl or aralkyl;
- R6 and R7 are tert-alkyl containing from 4 to 8 carbon atoms;
- X is (CH.sub.2).sub.n or arylene;
- Z.sup..crclbar. is an anion;
- and
- n is an integer from 2 to 6.
An electrostatographic developer comprising:
- a. a dry, particulate electrostatographic toner composition comprising a polymeric binder and a charge-control agent comprising a quaternary N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)alkyl]ammonium salt or a quaternary N-[(3,5-di-tert-alkyl-4-hydroxybenzoyloxy)aryl]ammonium salt having the structure:
- ##STR8## wherein R.sub.1 and R.sub.2 are tert-alkyl containing from 4 to 8 carbon atoms
- R.sub.3 is alkyl, aryl or aralkyl;
- R.sub.4 is alkyl, aryl, aralkyl or ##STR9## R.sub.5 is alkyl, aryl or aralkyl;
- R6 and R7 are tert-alkyl containing from 4 to 8 carbon atoms;
- X is (CH.sub.2).sub.n or arylene;
- Z.sup..crclbar. is an anion;
- and
- n is an integer from 2 to 6;
- and
- b. carrier particles.
Dependencies are inferred from the claim text.