Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS1750657 A
Publication typeGrant
Publication dateMar 18, 1930
Filing dateMar 11, 1927
Priority dateMar 29, 1926
Publication numberUS 1750657 A, US 1750657A, US-A-1750657, US1750657 A, US1750657A
InventorsAlbert Pietzsch, Gustav Adolph
Original AssigneeAlbert Pietzsch, Gustav Adolph
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Bleaching process
US 1750657 A
Abstract  available in
Images(1)
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Patented Mar. 18, 1930 UNITED STATES PATENT OFFICE GUSTAV ADOLPH AND ALBERT PIETZSCH, OF HOELLRIEGELSKREUTH, NEAR MUNICH,

I GERMANY BLEAGHING PROCESS ;Io Drawing. Application filed March 11, 1927, Serial No. 174,691, and in Germany March 29, 1928.

Hitherto, active oxygen has been used for bleaching chiefly in the form of hydrogen peroxide-solutions, except with soaps and oils that are bleached by means of per-sulphate or benzoyl peroxide. Bleaching by perborate or similar agents is practically a hydrogen peroxide bleaching process, since these chemical compositions split off hydrogen peroxide when dissolved.

Now, it was found, that a number of articles can be bleached to advantage by mixtures of hydrogen peroxide and percompounds, that do not split off hydrogen peroxide in the presence of water, as e. g. persulphates or benzoyl peroxide. It might have been expected, that such mixtures would decompose each other in a bleaching process, but such is not the case, rather a stronger bleaching eiiect taking place than with the employment of the single components. To obtain a more or less strong bleaching effect indifferent liquids, e. g. alcohol, may be added to the bleaching solutions. The bleaching baths, according to the requirements, may be either alkaline or neutral or acid.

If per-salts are used in an acid solution the same bleaching efl'ect results as with the addition of hydrogen peroxide, since hydrogen peroxide is' split off from the percompounds by the acid. so that this case forms aspecial case of the general process only. The bleaching eflect of such mixtures is so stron that they will bleach even in the cold, quick y and efiiciently within a few hours.

Example -phate of ammonia, feat-hers or hair may be leached and become bright within a few hours without affecting the article to be bleached. The bleaching efiect is accelerated and increased in many cases by ex osing the article to be bleached to the light uring the bleaching process, whereby the bleaching process may take place either in the bleaching bath itself or in the open air, in the latter case after the article has been soaked with the above mentioned solutions.

W'e declare, what we claim is:

1. I11 the process of bleaching, the step which consists in treating the articles to be bleached in abath containing hydrogen peroxide and a persulphate.

2. As a new article of manufacture, a bleaching bath comprising hydrogen peroxide and a persulphate.

In testimony whereof we hereunto allix our signatures.

DR. GUSTAV ADOLPH. ALBERT PIETZSCH.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2426142 *Sep 1, 1943Aug 19, 1947Du PontBleaching cotton textile goods
US2433661 *Jan 11, 1943Dec 30, 1947Mathieson Alkali Works IncMethod of bleaching
US2750308 *May 19, 1953Jun 12, 1956Jack & Heintz IncProcess of filming commutator segments and compositions therefor
US4781854 *Apr 2, 1987Nov 1, 1988Lever Brothers CompanyLiquid bleaching compositions
US6348226 *Jul 9, 1998Feb 19, 2002Mcaninch Terry L.Method for bleaching tripe using liquid bleaching agents
US8030351Aug 20, 2007Oct 4, 2011Ecolab, Inc.Treatment of animal carcasses
US8043650Feb 20, 2003Oct 25, 2011Ecolab Inc.Treatment of animal carcasses
Classifications
U.S. Classification252/186.22, 8/111, 252/186.43, 252/186.28
International ClassificationD06L3/00, D06L3/02
Cooperative ClassificationD06L3/023, D06L3/025
European ClassificationD06L3/02F, D06L3/02D