Cheng Chang

US Patent:

42161126, Aug 5, 1980

Filed:

Sep 21, 1977

Appl. No.:

5/835165

Inventors:

David N. Vincent - Glenview IL
Cheng H. Chang - Naperville IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

B01J 1302

US Classification:

252316

Abstract:

Pressure-sensitive microcapsules containing a solvent composition for use in carbonless copy systems for use in the absence of a halogenated solvent consisting essentially of a combination of a mono-alkyl naphthalene, wherein said alkyl group contains from 1 to 3 carbon atoms per molecule and a di-alkyl naphthalene, wherein each of said alkyl groups in said di-alkyl naphthalene contains from 2 to 4 carbon atoms per molecule, said mono-alkyl naphthalene being present in an amount between about 25 and about 40 percent by weight of the alkylated naphthalenes present in the solvent, and an isocyanate cross-linking agent.

US Patent:

40714691, Jan 31, 1978

Filed:

Aug 26, 1974

Appl. No.:

5/500903

Inventors:

David N. Vincent - Glenview IL
Cheng Hsiung Chang - Naperville IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

B01F 100

US Classification:

252364

Abstract:

A solvent composition for use in carbonless copy systems consisting essentially of a combination of a mono-alkyl naphthalene, wherein said alkyl group contains from 1 to 3 carbon atoms per molecule and a di-alkyl naphthalene, wherein each of said alkyl groups in said di-alkyl naphthalene contains from 2 to 4 carbon atoms per molecule. The solvent is used in the production of microcapsules wherein an isocyanate cross-linking agent is dissolved in the solvent.

US Patent:

41103432, Aug 29, 1978

Filed:

Feb 4, 1977

Appl. No.:

5/765693

Inventors:

David N. Vincent - Glenview IL
Cheng H. Chang - Chicago IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

C07D49322

US Classification:

260335

Abstract:

A substantially colorless bisfluoran chromogenic material having the structural formula ##STR1## wherein R. sup. 1 and R. sup. 2 each represent an alkyl group; X and Y each represent a hydrogen atom, a halogen atom, an hydroxyl group, an alkyl group, a nitro group, an amino group, an acyl group, or a carboalkoxy group; Z represents an oxy radical, a carbonyl group, an alkylene group, an alkylidene group, a sulfonyl group, or a thio radical; and n represents an integer from 0 to 1. The bisfluoran compounds are produced by reacting a 4-dialkylamino-2-hydroxy-2'-carboxybenzophenone with a diphenol wherein the diphenol is unsubstituted in at least one of the positions ortho to an hydroxyl group in each of the phenyl rings. The bisfluorans are used in pressure-sensitive copy systems comprising a support bearing microcapsules containing the bisfluorans, alone, or in combination with other color-forming materials.

US Patent:

39548031, May 4, 1976

Filed:

Jan 2, 1974

Appl. No.:

5/430142

Inventors:

David N. Vincent - Glenview IL
Cheng Hsiung Chang - Chicago IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

C07D31186

US Classification:

260335

Abstract:

A substantially colorless dilactone chromogenic material having the structural formula ##SPC1## And ##SPC2## Wherein R represents an alkyl group, an aryl group, an aralkyl group, an acyl group or an aroyl group; and X represents a hydrogen atom, a halogen atom, an alkyl group or a nitro group. The dilactone compounds are produced from precursor compounds that are formed by reacting pyromellitic dianhydride with a resorcinol having at least the fourth or the sixth position unsubstituted, in the presence of a dehydrating agent to form xanthyl derivatives of isophthalic and terephthalic acid. These precursors are then further reacted to form the dilactones. The dilactones are used in pressure-sensitive copy systems comprising a support bearing microcapsules containing the dilactones, alone, or in combination with other chromogenic materials.

US Patent:

40124193, Mar 15, 1977

Filed:

Jan 2, 1974

Appl. No.:

5/430141

Inventors:

David N. Vincent - Glenview IL
Cheng Hsiung Chang - Chicago IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

C07D51900

US Classification:

260335

Abstract:

A substantially colorless bisfluoran chromogenic material having the structural formula ##STR1## wherein R. sup. 1 and R. sup. 2 each represent an alkyl group; X and Y each represent a hydrogen atom, a halogen atom, an hydroxyl group, an alkyl group, a nitro group, an amino group, an acyl group, or a carboalkoxy group; Z represents an oxy radical, a carbonyl group, an alkylene group, an alkylidene group, a sulfonyl group, or a thio radical; and n represents an integer from 0 to 1. The bisfluoran compounds are produced by reacting a 4-dialkylamino-2-hydroxy-2'-carboxybenzophenone with a diphenol wherein the diphenol is unsubstituted in at least one of the positions ortho to an hydroxyl group in each of the phenyl rings. The bisfluorans are used in pressure-sensitive copy systems comprising a support bearing microcapsules containing the bisfluorans, alone, or in combination with other color-forming materials.

US Patent:

41383621, Feb 6, 1979

Filed:

Jan 18, 1977

Appl. No.:

5/760459

Inventors:

Anthony E. Vassiliades - Deerfield IL
Cheng H. Chang - Naperville IL

Assignee:

Champion International Corporation - Stamford CT

International Classification:

B01J 1302

US Classification:

252316

Abstract:

Pressure-rupturable, oil-containing microcapsules are produced by admixing a water-immiscible, oily material containing an oil-soluble, non-polymeric polyfunctional isocyanate cross-linking agent, and an aqueous solution of a polymeric emulsifying agent in the form of a water-soluble polymer containing recurring --NH. sub. 2 or. dbd. NH groups or a water-soluble natural gum containing recurring hydroxy groups. An oil-in-water emulsion is formed containing the isocyanate dispersed in the form of microscopic emulsion droplets in the aqueous continuous phase containing the emulsifying agent, and a solid capsule wall is formed by the cross-linking of the emulsifying agent by the isocyanate. Emulsions utilizing the natural polymeric emulsifying agents preferably contain a viscosity lowering agent in the form of a urea-formaldehyde or alkali metal periodate in order to obtain a higher solids coat weight while at an efficient coating viscosity.