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Gerald Prazak

from Charleston, SC
Age ~89

Gerald Prazak Phones & Addresses

  • 830 Sheldon Rd, Charleston, SC 29407 (843) 766-0274
  • Goose Creek, SC
  • 830 Sheldon Rd, Charleston, SC 29407 (843) 457-6321

Work

Position: Retired

Education

Degree: Graduate or professional degree

Emails

j***e@comcast.net

Resumes

Resumes

Gerald Prazak Photo 1

Gerald Prazak

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Location:
United States

Publications

Us Patents

Azo Dye Reduction Improvement Of Lignin

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US Patent:
4355996, Oct 26, 1982
Filed:
Mar 4, 1981
Appl. No.:
6/240279
Inventors:
Peter Dilling - Isle of Palms SC
Gerald Prazak - Charleston SC
Assignee:
Westvaco Corporation - New York NY
International Classification:
C09B 900
C09B 6730
C09B 6710
C09B 6740
US Classification:
8561
Abstract:
Improved sulfonated lignin surfactants are provided for use as dispersants in dyestuffs. The process for providing the improved surfactants relates to using metals and borate salts to react with the azo dye reducing dihydroxy functions of the lignin molecule through chelation and ester formation mechanisms thereby inhibiting the lignin's azo dye reducing characteristics.

Lignosulfonate Additive-Containing Carbon Black Compositions

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US Patent:
4892587, Jan 9, 1990
Filed:
Oct 24, 1988
Appl. No.:
7/261156
Inventors:
Peter Dilling - Isle of Palms SC
Gerald Prazak - Charleston SC
Catherine C. Cashman - Hanahan SC
Assignee:
Westvaco Corporation - New York NY
International Classification:
C08L 9702
US Classification:
1061231
Abstract:
A carbon black composition comprising carbon black and a lignin dispersant prepared by the steps of methylolating a lignin compound by reaction of less than about 2 moles formaldehyde per 1,000 grams of the lignin, and sulfonating the methylolated lignin by reaction from about 2. 5 to 3. 5 moles of the sulfite or bisulfite compound per 1,000 grams of lignin at an initial reaction pH of below about 6. 6 and at a temperature of at least about 170. degree. C. , while allowing the pH of the reaction mixture to rise to a final pH of greater than 7. 5 to sequentially sulfomethylate the aromatic nucleus and sulfonate the side chain of the lignin.

Process For Making Sulfonated Lignin Surfactants

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US Patent:
4001202, Jan 4, 1977
Filed:
Oct 17, 1975
Appl. No.:
5/623441
Inventors:
Peter Dilling - Charleston SC
Gerald Prazak - Charleston SC
Assignee:
Westvaco Corporation - New York NY
International Classification:
C07G 100
US Classification:
260124R
Abstract:
Disclosed herein is an improved process for producing sulfonated lignin surfactants for use as dispersants for disperse dyes and vat dyes. The improved process is to react a sulfonated lignin and epihalohydrin under certain conditions to block a portion of the free-phenolic hydroxyl group and at the same time cross-link the lignin molecules to increase the molecular weight. Another aspect of the process of this invention is to oxidize the thus treated lignin to stabilize its properties. Dispersants made according to this process have improved fiber staining and heat stability properties over other lignin-based dispersants.

Dyestuff Compositions Containing Modified Sulfonated Lignin Dye Dispersants

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US Patent:
4025303, May 24, 1977
Filed:
Jul 31, 1972
Appl. No.:
5/276424
Inventors:
Gerald Prazak - Charleston SC
Assignee:
Westvaco Corporation - New York NY
International Classification:
D06P 130
US Classification:
8 28
Abstract:
Dyestuff composition for use in dyeing cotton fibers comprising a mixture of dye cakes of various colors, primarily direct or vat dyes, and sulfonated lignin dye dispersants having retarding properties. The dye dispersants of this invention are the reaction product of a sulfonated lignin and from 0. 1 to 9. 0% by weight of the total dispersant of a water-soluble magnesium salt, preferably 1. 0 to 2. 0% by weight. These dye dispersants are excellent dye retarders by eliminating uneven dyeing, and reduce foaming problems associated with dispersed vat dyes. These dye dispersants having retarding properties are used when a plurality of dye cakes are used in one dyeing operation to produce the much desired levelling effect on the process of vat dyeing.

Production Of Lignosulfonate Additives

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US Patent:
4892588, Jan 9, 1990
Filed:
Oct 24, 1988
Appl. No.:
7/261155
Inventors:
Peter Dilling - Isle of Palms SC
Vaughn R. Loeffler - Summerville SC
Gerald Prazak - Charleston SC
Karin U. Thomas - Alvin SC
Assignee:
Westvaco Corporation - New York NY
International Classification:
C08L 9702
US Classification:
1061231
Abstract:
A method of producing a lignin dispersant composition comprising the steps of methylolating a lignin compound by reaction of less than about 2 moles formuladehyde per 1,000 grams of the lignin, and sulfonating the methylolated lignin by reaction from about 2. 5 to 3. 5 moles of the sulfite or bisulfite compound per 1,000 grams of lignin at an initial reaction pH of below about 6. 6 and at a temperature of at least about 170. degree. C. , while allowing the pH of the reaction mixture to rise to a final pH of greater than 7. 5 to sequentially sulfomethylate the aromatic nucleus and sulfonate the side chain of the lignin. The products of the method find particular use as dispersants in dye compositions and carbon black compositions with lower viscosity and extended shelf-life storage of the composition.
Gerald Prazak from Charleston, SC, age ~89 Get Report