Bleaching and dyeing; fluid treatment and chemical modification – Cleaning or laundering – Removing formation impurities from artifical fiber
Patent
1996-05-24
1999-10-26
Fries, Kery
Bleaching and dyeing; fluid treatment and chemical modification
Cleaning or laundering
Removing formation impurities from artifical fiber
510224, 510226, 510300, 510305, 510306, 510309, 510320, 510392, 510374, 510375, 510530, 8401, C11D 3386, C11D 3395
Patent
active
059720409
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to detergent compositions containing percarbonate bleach, and amylase enzyme at narrowly defined ratios, to provide synergistic stain removal performance, in particular on specific stains such as starch-based stains, and blood stains.
BACKGROUND OF THE INVENTION
The inorganic perhydrate bleach most widely used in laundry detergent compositions is sodium perborate in the form of either the monohydrate or tetrahydrate. However, concerns about the impact of boron salts on the environment have led to an increasing interest in other perhydrate salts, of which sodium percarbonate is the most readily available.
Detergent compositions containing sodium percarbonate are known in the art. Sodium percarbonate is an attractive perhydrate for use in detergent compositions because it dissolves readily in water, is weight efficient and, after giving up its available oxygen, provides a useful source of carbonate ions for detergency purposes.
On the other hand, the use of amylase enzymes in detergent compositions is known, although such use has been mainly described in perborate-based formulations.
The use of enzymes, including amylase in percarbonate-based compositions is known from e.g. JP 57028197; PCT/US93/06302 and PCT/US93/06877.
Although the action of amylase on starch-based stains in particular, is known, and the action of percarbonate on bleacheable stains is also known, it has now been surprisingly discovered that the combined use of percarbonate and amylase at specific ratios provides a synergetic effect on the removal of difficult stains such as starch-based stains and blood stains, in particular at low temperatures.
In addition such a synergetic removal effect is also seen on particulate stains such as peat clay, mud, fertilizing soil, high organic content clay.
It has further been found that the ternary system consisting of percarbonate/amylase/protease at specific ratios provides an even better result on the above stains, in particular on starch-based and blood stains.
DETAILED DESCRIPTION OF THE INVENTION
Both laundry detergent compositions including laundry additives and automatic dishwashing compositions are encompassed by the term "detergent compositions" herein. Methods of treatment of textile are also encompassed.
The laundry detergent or automatic dishwashing compositions herein typically contain from 1% to 40%, preferably from 3% to 30% by weight, most preferably from 5% to 25% by weight of an alkali metal percarbonate bleach (when expressed on an AvOx basis of 13.5%) in the form of particles having a mean size from 250 to 900 micrometers, preferably 500 to 700 micrometers.
Laundry additives typically contain from 20% to 80% of said percarbonate particles.
The alkali metal percarbonate bleach is usually in the form of the sodium salt. Sodium percarbonate is an addition compound having a formula corresponding to 2Na.sub.2 CO.sub.3 3H.sub.2 O.sub.hd 2. To enhance storage stability the percarbonate bleach can be coated with e.g. a further mixed salt of an alkali metal sulphate and carbonate. Such coatings together with coating processes have previously been described in GB-1,466,799, granted to Interox on Mar. 9, 1977. The weight ratio of the mixed salt coating material to percarbonate lies in the range from 1:2000 to 1:4, more preferably from 1:99 to 1:9, and most preferably from 1:49 to 1:19. Preferably, the mixed salt is of sodium sulphate and sodium carbonate which has the general formula Na2SO4.n.Na2CO3 wherein n is from 0.1 to 3, preferably n is from 0.3 to 1.0 and most preferably n is from 0.2 to 0.5.
Other suitable coating materials are sodium silicate, of SiO.sub.2 :Na.sub.2 O ratio from 1.6:1 to 2.8:1, and magnesium silicate.
Commercially available carbonate/sulphate coated percarbonate bleach may include a low level of a heavy metal sequestrant such as EDTA, 1-hydroxyethylidene 1,1-diphosphonic acid (HEDP) or an aminophosphonate, that is incorporated during the manufacturing process.
Preferred heavy metal sequestrants for incorporation as d
REFERENCES:
patent: 3789001 (1974-01-01), Painelli
patent: 4381247 (1983-04-01), Nakagawa et al.
patent: 4526698 (1985-07-01), Kuroda et al.
patent: 4620936 (1986-11-01), Kielman et al.
patent: 4969927 (1990-11-01), Schumann et al.
patent: 5219549 (1993-06-01), Onda et al.
patent: 5223179 (1993-06-01), Connor et al.
patent: 5227084 (1993-07-01), Martens
patent: 5246612 (1993-09-01), VanDijk et al.
patent: 5312698 (1994-05-01), Onda et al.
patent: 5318714 (1994-06-01), Markussen et al.
patent: 5318728 (1994-06-01), Surutzidis et al.
patent: 5338491 (1994-08-01), Connor et al.
patent: 5614484 (1997-03-01), Panadiker
patent: 5635104 (1997-06-01), Kott et al.
patent: 5705466 (1998-01-01), Baillely
patent: 5786314 (1998-07-01), Sadlowski
Moss Michael Alan John
Thoen Christiaan Arthur
Cook C. Brant
Fries Kery
Rasser Jacobus C.
The Procter & Gamble & Company
Zerby Kim William
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