Liquid inks using a gel organosol
AssigneeMinnesota Mining and Manufacturing Company
InventorsJames A. Baker, Jai Venkatesan, Wu-Shyong Li, Gay L. Herman
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Abstract
An organosol comprising a high molecular weight (co)polymeric steric stabilizer covalently bonded to an insoluble, high molecular weight thermoplastic (co)polymeric core is described which has the ability to form a three dimensional gel of controlled rigidity. The gel provides improved liquid ink or liquid electrophotographic/electrographic toner compositions by increasing sedimentation stability of the colorant, without compromising print quality or ink transfer performance. The gel is formed by manipulating the solubility parameter difference between the stabilizer and the solvent to achieve optimum performance of the dispersion.
Claims19
A gel organosol dispersion comprising:
- (a) an aliphatic hydrocarbon carrier liquid having a Kaufi-Butanol number less than 30;
- and
- (b) a (co)polymeric static stabilizer having a weight average molecular weight greater than or equal to 50,000 Daltons and a polydispersity less than 15, said steric stabilizer being covalently bonded to a thermoplastic (co)polymertc core that is insoluble in said carrier liquid,
- wherein the weight ratio of said (co)polymeric atetic stabilizer to said thermoplastic (co)polymeric core is between 1/1 and 1/15, and said (co)polymeric steric stabilizer comprises polymerizable organic compounds or mixture of polymerizable organic compounds having an absolute Hildebrand solubility parameter difference between said polymerizable organic compounds or said mixture of polymerizable organic compounds and said carrier liquid between 2.5 and 3.0 MPa.sup.1/2.
A gel organosol dispersion comprising:
- (a) a carrier liquid having a Kauri-Butanol number less than 30;
- and
- (b) a (co)polymeric steric stabilizer having a weight average molecular weight greater than or equal to 50,000 Daltons and a polydispersity less than 15, said atetic stabilizer being covalently bonded to a thermoplastic (co)polymeric core that is insoluble in said carrier liquid,
- wherein the weight ratio of said (co)polymeric steric stabilizer to said thermoplastic (co)polymeric core is between 1/1 and 1/15, and said (co)polymeric steric stabilizer comprises polymerizable organic compounds or mixture of polymerizable organic compounds having an absolute Hildebrand solubility parameter difference between said polymerizable organic compounds or said mixture of polymerizable organic compounds and said carrier liquid between 2.5 and 3.0 MPa.sup.1/2.
A gel organosol dispersion comprising:
- (a) a carrier liquid having a Kauri-Butanol number less than 30;
- and
- (b) a (co)polymeric steric stabilizer having a weight average molecular weight between 50,000 and 750,000 Daltons and a polydispersity less than 15, said steric stabilizer being covalently bonded to a
- thermoplastic (co)polymeric core that is insoluble in said carrier liquid, wherein the weight ratio of said (co)polymeric steric stabilizer to said thermoplastic (co)polymeric core is between 1/1 and 1/15, and said (co)polymeric steric stabilizer comprises polymerizable organic compounds or mixture of polymerizable organic compounds having an absolute Hildebrand solubility parameter difference between said polymerizable organic compounds or said mixture of polymerizable organic compounds and said carrier liquid between 2.5 and 3.0 MPa.sup.1/2.
Dependencies are inferred from the claim text.