Ozone decolorization of garments

• US 5,342,415 A
• Filed: 10/10/1991
• Issued: 08/30/1994
• Est. Priority Date: 07/31/1990
• Status: Expired due to Fees

• Current Assignee: Ozone Engineering, Design and Services Corp.
• Original Assignee: Eric Wasinger
• Inventors: Wasinger, Eric, Hall, David
• Primary Examiner(s): MEDLEY, MARGARET B
• Application Number:
  US07/776,609
• Time in Patent Office: 1,055 Days
• Field of Search: 8/101, 8/110, 8/111, 8/114.6, 8/447, 8/478, 8/472, 8/483, 8/482, 8/102
• US Class Current: 8/111
• CPC Class Codes: D06B 11/0096 to get a faded look
• CPC Class Codes: D06L 4/50 by irradiation or ozonisation
• CPC Class Codes: D06P 5/153 with oxidants

Abstract

A process for selectively decolorizing a garment containing cellulosic material which comprises the steps of providing said garment with a dye or coloring agent reactive to ozone, wetting said garment and then contacting said wetted garment with ozone or a mixture of steam and ozone whereby the ozone is reacted with the dye or coloring agent.

Claims

1. A method for decolorizing an ice washed dyed cellulosic garment having an undesirable oxidizable coloring agent obtained by prior treatment with potassium permanganate which comprises the steps of contacting said garment in the presence of moisture and ozone in a vapor phase in a chamber at a temperature of about 40°

to 100°

C. for a period of time to decolorize said coloring agent and terminating contact with ozone prior to any degradation of said garment or the dye on the garment.

2. The method of claim 1 wherein said ozone is present in an amounts of about 10 to 100 mg per liter.