David Sy Chang

US Patent:

6861464, Mar 1, 2005

Filed:

Jul 19, 2002

Appl. No.:

10/199379

Inventors:

Rajan Eadara - Ann Arbor MI, US
Mooil Chung - Troy MI, US
David Wen-Lung Chang - Troy MI, US
Sunny K. George - Sterling Heights MI, US
Patrick A. Ohaka - Southfield MI, US
Joribeth E. Joseff - Mount Pleasant SC, US
Yushin Ahn - Farmington Hills MI, US

Assignee:

Diversified Chemical Technologies, Inc. - Detroit MI

International Classification:

C08L031/04

US Classification:

524502, 524563, 524500, 524514, 524507, 524270, 524277

Abstract:

A two component, curable hot melt adhesive system includes a first hot melt adhesive formulation which has a softening temperature greater than room temperature and which includes a first component of a curable adhesive therein. The system includes a second hot melt adhesive formulation which has a softening temperature which is greater than room temperature and which includes a second component of a curable adhesive therein. The second component is reactive with the first component to provide a cured adhesive bond. In use, the two formulations are heated to a temperature above their softening temperature and are contacted so as to cause mixing. The mixture cools to provide a thermoplastic bond which subsequently cures to provide a permanent adhesive bond. While the first and the second component individually perform as hot melt adhesives, combining the first and the second gives enhanced adhesive performance in extended temperature ranges.

US Patent:

55407382, Jul 30, 1996

Filed:

Mar 13, 1995

Appl. No.:

8/402722

Inventors:

Alexander C. Chan - Mineola NY
David L. Chang - Norwalk CT
Yuh-Guo Pan - Stamford CT

International Classification:

A61K 713

US Classification:

8406

Abstract:

A single-stage process for dyeing keratinous fibers in intense colors comprising simultaneously applying to said keratinous fibers a composition comprising iodide ions, an oxidant and an effective concentration of an oxidation dye to produce said intense colors when the pH of said composition is alkaline.

US Patent:

51395320, Aug 18, 1992

Filed:

Nov 27, 1991

Appl. No.:

7/798452

Inventors:

A. C. Chan - Mineola NY
Y. G. Pan - Stamford CT
David L. Chang - Norwalk CT

Assignee:

Clairol, Inc. - New York NY

International Classification:

A61K 713

US Classification:

8405

Abstract:

P-phenylenediamines having a quaternary ammonium group and substituted with an electron withdrawing group, derivatives thereof, compositions containing same, and their use as developers for dyeing keratinous fibers, are disclosed.

US Patent:

62105175, Apr 3, 2001

Filed:

Apr 13, 1999

Appl. No.:

9/290737

Inventors:

Rajan Eadara - Ann Arbor MI
Mooil Chung - Troy MI
David Wen-Lung Chang - Troy MI
Weichen Chi - Troy MI

Assignee:

Diversified Chemical Technologies, Inc. - Ferndale MI

International Classification:

C08J10900
C08J 402
B32B 3126
B32B 3128

US Classification:

1562733

Abstract:

A radiation curable precursor coating composition for the preparation of a non-blocking, heat activatable adhesive includes a curable acrylic material, a curable elastomeric material, and a hydrocarbon tackifier material having a softening temperature ranging from approximately 50. degree. C. to approximately 200. degree. C. , wherein when the acrylic material and the elastomeric material are cured, the coating composition is non-blocking at room temperature, but when the coating composition is heated to a temperature above both the softening temperature of the hydrocarbon tackifier and the Tg of the coating composition, the coating composition becomes adhesive.