TONER COMPOSITION EMPLOYING POLYMER WITH SIDE-CHAIN CRYSTALLINITY

• US 3,853,778 A
• Filed: 01/03/1972
• Issued: 12/10/1974
• Est. Priority Date: 01/03/1972
• Status: Expired due to Term

• Current Assignee: Burton B. Jacknow, David A. Buckley, Joseph H. Moriconi, Robert Mermelstein, Thomas R. Hoffend
• Original Assignee: Burton B. Jacknow, David A. Buckley, Joseph H. Moriconi, Robert Mermelstein, Thomas R. Hoffend
• Inventors: Hoffend, Thomas R., Buckley, David A., Jacknow, Burton B., Mermelstein, Robert, Moriconi, Joseph H.
• Primary Examiner(s): Smith, Ronald H.
• Assistant Examiner(s): Goodrow, John L.
• Application Number:
  US05/215,936
• Time in Patent Office: 1,072 Days
• Field of Search: 252/62.1 117/17.1 96/1SD
• US Class Current: 430/109.1
• CPC Class Codes: G03G 13/08 using a solid developer, e.g. powder developer
• CPC Class Codes: G03G 9/08711 with esters of acrylic or methacrylic acid
• CPC Class Codes: G03G 9/08728 Polymers of esters
• CPC Class Codes: G03G 9/08791 characterised by the presence of specified groups or side chains
• CPC Class Codes: G03G 9/08795 characterised by their chemical properties, e.g. acidity, molecular weight, sensitivity to reactants

Abstract

Electrostatographic toner compositions are provided which melt over a narrow temperature range and which have the correct degree of hardness and toughness whereby they can be easily particulated, resist impaction, do not tend to deposit undesirable films on electrostatographic plates and do not fracture during use. The toner compositions of the present invention comprise a polymer selected from the group consisting of a crystalline homopolymer or copolymer having an amorphous backbone and side-chain crystallinity derived by the polymerization of a polymerizable mixture containing at least about 2 wt. % of a polymerizable monomer having a crystalline alkyl group of at least about 14 carbon atoms.

Claims

1. AN ELECTROSTATOGRAPHIC DEVELOPER COMPOSITION COMPRISING ABOUT 0.5 TO 10 WT. PERCENT OF TONER PARTICLES, SAID TONER PARTICLES COMPRISING A POLYMER SELECTED FROM THE GROUP CONSISTING OF A CRYSTALLINE HOMOPOLYMER OR COPOLYMER HAVING AN AMORPHOUS BACKBONE AND SIDE-CHAIN CRYSTALLINITY DERIVED BY THE POLYMERIZATION OF A POLYMERIZABLE MIXTURE CONTAINING AT LEAST ABOUT 2 WT. PERCENT OF A POLYMERIZABLE MONOMER HAVING A CRYSTALLINE ALKYL GROUP OF AT LEAST ABOUT 14 CARBON ATOMS AND ABOUT 90 TO 99.5 WT. PERCENT OF CARRIER PARTICLES.

2. The composition of claim 1 wherein the toner comprises a crystalline homopolymer.

3. The composition of claim 2 wherein the backbone of the homopolymer is derived by the polymerization of a vinyl monomer.

4. A process for developing an electrostatic latent image comprising contacting a latent image bearing member with the developer composition of claim 1 whereby toner is attracted to said member in imagewise configuration.

5. The process of claim 4 wherein said toner comprises a crystalline homopolymer.

6. The process of claim 5 wherein said toner is derived by the polymerization of a vinyl monomer.