Laundering process for dual bleaching stained fabrics
First Claim
1. A method of reclaiming stained cellulosic and cellulosic-polyester blend textile fabrics by a washing and bleaching process comprising:
- bleaching said textile fabrics in an aqueous solution of at least one anionic or non-ionic surface-active agent at a concentration of about 0.01 percent to about 0.25 percent by weight in admixture with (a) about 0.01 percent to about 1 percent by weight of a chlorine-releasing agent and (b) about 0.01 percent to about 2 percent by weight of an oxygen-releasing agent at a pH of about 9 to about 12, a temperature of about 160°
F. to about 190°
F. for a period of time of about 5 minutes to about 30 minutes.
1 Assignment
0 Petitions
Accused Products
Abstract
Stained textile fabrics, especially cotton-polyester, rayon-polyester blends stained in use with blood stains, can be reclaimed and returned to use by the process of washing and bleaching said fabrics in the presence of a non-ionic or anionic surface-active agent, together with an oxygen-releasing bleaching agent and a chlorine-releasing bleaching agent, said bleaching agents used either successively or simultaneously. The laundering process involves the use of aqueous solutions of bleaching agents at elevated temperatures and at high pH. The process of the invention provides a synergistic improvement in the removal of stains as compared with the use of either an oxygen-releasing bleaching agent or a chlorine-releasing bleaching agent. The process can include a hot aqueous acid sour treatment to remove rust stains and an aqueous sour to neutralize alkalies in the bleached fabric. The treatment can be completed in a period of time of about 30 to about 90 minutes.
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Citations
14 Claims
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1. A method of reclaiming stained cellulosic and cellulosic-polyester blend textile fabrics by a washing and bleaching process comprising:
- bleaching said textile fabrics in an aqueous solution of at least one anionic or non-ionic surface-active agent at a concentration of about 0.01 percent to about 0.25 percent by weight in admixture with (a) about 0.01 percent to about 1 percent by weight of a chlorine-releasing agent and (b) about 0.01 percent to about 2 percent by weight of an oxygen-releasing agent at a pH of about 9 to about 12, a temperature of about 160°
F. to about 190°
F. for a period of time of about 5 minutes to about 30 minutes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- bleaching said textile fabrics in an aqueous solution of at least one anionic or non-ionic surface-active agent at a concentration of about 0.01 percent to about 0.25 percent by weight in admixture with (a) about 0.01 percent to about 1 percent by weight of a chlorine-releasing agent and (b) about 0.01 percent to about 2 percent by weight of an oxygen-releasing agent at a pH of about 9 to about 12, a temperature of about 160°
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8. A method of reclaiming, by a washing and bleaching process, stained fabrics consisting of cotton, cotton-polyester blends and rayon-polyester blends at a pH of about 9 to about 12 and a temperature of about 160°
- F. to about 190°
F. comprising the sequential aqueous treatment, of said fabrics in two stages with a chlorine-releasing agent and an oxygen-releasing agent in any order, wherein in each stage, said bleaching agent is present in an aqueous solution in the presence of about 0.01 percent to about 0.25 percent by weight of at least one anionic or non-ionic surface active agent, and wherein said oxygen-releasing agent is present in the concentration of about 0.01 percent to about 2 percent by weight and is selected from the group consisting of at least one of hydrogen peroxide, alkali metal and alkaline earth metal perborates, percarbonates, persilicates, and peroxides and wherein said chlorine-releasing bleaching agent is present in the concentration of about 0.01 percent to about 1 percent by weight and is selected from the group consisting of the alkali metal hypochlorites, the alkaline earth metal hypochlorites, dichlorodimethylhydantoin, the chlorinated alkali metal isocyanurates, the chlorinated isocyanuric acids, and mixtures thereof. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- F. to about 190°
Specification