Howard Matrick

US Patent:

51415569, Aug 25, 1992

Filed:

Jun 13, 1991

Appl. No.:

7/714879

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C09D 1102

US Classification:

106 20

Abstract:

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a diol penetrant. The latter is an aliphatic diol having at least 6 carbon atoms, a solubility in water of at least 4. 5 parts in 100 parts of water at 25. degree. C. and is selected from the group consisting essentially of: (1) compounds wherein at least 2 carbon atoms are attached as substituents to the main chain, and (2) Hexene [1,2-]diols. The pigment dispersion consists of pigment particles and a dispersant, preferably a polymeric dispersant having a hydrophilic segment and a segment that links to the pigment. These inks exhibit rapid drying, are storage stable, have reliable performance and give images having good print quality.

US Patent:

51603721, Nov 3, 1992

Filed:

Jun 13, 1991

Appl. No.:

7/714877

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C09D 1100

US Classification:

106 19R

Abstract:

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and an amide diol or ester diol cosolvent penetrant such as hydroxypivalyl hydroxypivalate. The cosolvent penetrant has a solubility in water of at least 4. 5 parts in 100 parts of water at 25. degree. C. The pigment dispersion consists of pigment particles and a dispersant, preferably a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit rapid drying, have excellent decap performance, are storage stable and give images having good print quality.

US Patent:

45618992, Dec 31, 1985

Filed:

Nov 21, 1984

Appl. No.:

6/673925

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C08L 108

US Classification:

106193P

Abstract:

Yellow crystal stable pigment of mono-azo type having an average particle size of 0. 02 to 0. 8. mu. m, the pigment having on its surface a crystal growth inhibitor compound having substantially similar chemical structure as the pigment, being more soluble than the pigment in solvents used to disperse the pigment, the inhibitor compound not fitting within the crystal lattice of the pigment. The crystal growth of pigment dispersions due to Ostwald ripening can be prevented by adding a crystal growth inhibitor as noted above to the pigment dispersion. The pigments can be dispersed in an organic polymeric binder, e. g. , cellulose acetate, to form yellow toners which are useful in toning photosensitive color proofing systems.

US Patent:

51694360, Dec 8, 1992

Filed:

May 13, 1992

Appl. No.:

7/882400

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C09D 1102

US Classification:

106 20D

Abstract:

Aqueous ink jet ink compositions comprising an aqueous carrier medium, a colorant and a sulfoxide or sulfone penetrant having a solubility in water of at least 4. 5% at 25. degree. C. and represented by the formula: H(CH. sub. 2). sub. a S(O). sub. n (CH. sub. 2). sub. b H wherein a+b=5-8, and n=1-2; exhibit rapid drying, excellent image definition, are storage stable and have excellent decap properties.

US Patent:

49606778, Oct 2, 1990

Filed:

Aug 14, 1987

Appl. No.:

7/086018

Inventors:

Josette C. Seibles - Piscataway NJ
Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G03C 504

US Classification:

430331

Abstract:

A dry nonelectroscopic toner surface coated with 3 to 40% by weight of an organofunctional substituted fluorocarbon compound. Toners of the invention are useful for developing photosensitive elements having imagewise tacky and complementary nontacky image areas. The surface coating imparts good toning and clean-up characteristics, together with improved performance on aging.

US Patent:

49651722, Oct 23, 1990

Filed:

Dec 22, 1988

Appl. No.:

7/289848

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

G03C 500
C08F 1212

US Classification:

430291

Abstract:

This invention concerns a method for color development of a surface having imagewise tacky and nontacky image areas which comprises (a) applying a dry nonelectroscopic toner to the image-bearing surface; (b) distributing the toner particles over the image surface whereby the distributed toner particles become embedded solely in the tacky image areas; and (c) physically removing toner particles from the nontacky areas which are left substantially free of the toner particles, the improvement wherein high resolution images having higher toned optical density with improved color purity are obtained using a dry nonelectroscopic humidity resistant toner having a size distribution within the range from about 0. 2 micron to about 10 microns, not more than 10% of the toner being below 0. 5 micron and not more than 10% of the toner being above 5 microns, and the toner consists essentially of a colorant dispersed in an organic resin wherein the resin is a single homogeneous polymer selected from the group consisting of homopolymers of styrene or styrene homologs, and interpolymers thereof, said polymer having a number average molecular weight in the range from about 500 to about 2,000 and said polymer having a softening temperature in the range from about 75. degree. C.

US Patent:

52058611, Apr 27, 1993

Filed:

Oct 9, 1991

Appl. No.:

7/774074

Inventors:

Howard Matrick - Highlands NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C09D 1102

US Classification:

106 20D

Abstract:

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a nitrogen heterocyclic diol cosolvent which retards or inhibits pluggage failure. The cosolvent has a solubility in water of at least 4. 5 parts in 100 parts of water at 25. degree. C. The pigment dispersion consists of pigment particles and a polymeric dispersant, having a hydrophilic segment and a segment that links to the pigment. These inks exhibit excellent decap performance, are storage stable and give images having excellent print quality.

US Patent:

51804255, Jan 19, 1993

Filed:

Nov 5, 1991

Appl. No.:

7/788141

Inventors:

Howard Matrick - Highlands NJ
Michele E. Shepard - Escondido CA
Young S. You - Los Altos CA

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C09D 1100
C08K 500

US Classification:

106 22R

Abstract:

An ink for ink jet printers which comprises an aqueous carrier medium, pigment dispersion or dye and a polyol/alkylene oxide condensate cosolvent which eliminates film formation on thermal ink jet resistor surfaces thereby eliminating non-uniformity in optical density. The cosolvent present at least 5% has a solubility in water of at least 4. 5 parts in 100 parts of water at 25. degree. C. and a general formula: ##STR1## wherein X=--H or --CH. sub. 3 ; R=--H, --CH. sub. 3, --C. sub. 2 H. sub. 5, --C. sub. 3 H. sub. 7, --C. sub. 4 H. sub. 9, or --CH. sub. 2 O(CH. sub. 2 CH. sub. 2 O). sub. e H; b=0 or 1, a+d+f(c+e)=2-100; and f=1-6, the cosolvent being present in the amount of at least 4. 5% based on the total weight of the ink jet ink composition. These inks exhibit freedom from thermal resistor film formation, have excellent decap performance, are storage stable and give images having excellent print quality.