Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-12-13
2003-09-30
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S276000, C510S327000, C510S329000, C510S330000, C008S115600
Reexamination Certificate
active
06627591
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to compositions that provide care to the colors of fabrics in laundry treatment.
BACKGROUND OF THE INVENTION
The appearance of colored fabrics, e.g., clothing, bedding, household fabrics like table linens is one of the areas of concern to consumers. Indeed, upon typical consumer's uses of the fabrics such as wearing, washing, rinsing and/or tumble-drying of fabrics, a loss in the fabric appearance, which is at least partly due to loss of color shade intensity, fidelity and color definition, is observed. Such a problem of color loss is even more acute in laundry treatment after multiwash cycles, especially for dark colors, such as blacks, reds, blues, and greens.
Several mechanisms have been speculated upon for color loss and various means have been proposed to prevent or reduce the extent of the loss or transfer of color. For example, color fixatives, known in the dyeing industry have been proposed, as have agents (such as PVP) to hold color materials in solution to prevent re-deposition or to prevent abrasion between fibers. It has also been suggested to add bleaching agents to wash liquor to bleach any dye that enters solution.
One cause of color loss is the use of an inappropriate detergent composition. Thus, many manufacturers produce “color care” formulations that do not contain bleaches. Despite this, color damage remains a significant problem in the eyes of consumers.
WO 00/15746 (P&G), filed Sep. 15, 1998, published Mar. 23, 2000, discloses fabric care compositions, which comprise low molecular weight polyamines for color care. It is believed that the polyamines intercept peroxygen bleaching. A dye fixative may also be present in the compositions disclosed, as may an “abrasion reducing polymer” such as the N-heterocyclic polymer PVP (see examples 50-53 in table XII).
One aspect of the present invention is to provide a composition which provides improved color appearance of the laundered fabrics, especially after a single washing cycle and more especially after multiple wash cycles.
Applicants have surprisingly found that the combination of a dye fixing agent, an N-heterocyclic polymer, and a nonionic surfactant can be used as an additive in conjunction with a laundry detergent, or in a presoak step to solve the problem of dark color preservation.
SUMMARY OF THE INVENTION
One aspect of the present invention is a composition comprising a dye fixing agent, an N-heterocyclic polymer, and a nonionic surfactant. Preferably a chelating compound is added to reduce color shifting, especially for the reduction of bluing of direct red dyes when tap water containing dissolved metals such as iron, copper, and the like is used.
In another aspect of the invention, there is provided a method for providing color care to fabrics upon domestic laundering treatments which comprise the step of contacting the fabrics with the inventive composition, either in the presence of detergent or in a presoak step without detergent. In a further aspect of the invention, improvement in color shade stability and dye transfer is observed for treated fabrics, especially direct-dyed, cellulosic dark colored fabrics, even if the water temperature of the treatment is varied from cold (60 F) to hot (130 F). Direct dyed cellulosic fabrics (e.g. cotton, rayon, etc.) show substantially improved color shade retention and minimal dye transfer with the inventive composition.
DETAILED DESCRIPTION
The inventive fabric care composition comprises a dye fixing agent, an N-heterocyclic polymer, and a nonionic surfactant dissolved in water, a water miscible solvent, or a blend thereof. The inventive composition may also be in the form of a semisolid, powder or granule which is dissolved in an aqueous medium when ready for use. In the liquid state, preferably the dye fixing agent is present in the concentration range of 0.1 to 20 wt. %, more preferably in the concentration range of 1 to 10 wt. %. Preferably the N-heterocyclic polymer is present in the concentration range of 0.01 to 10 wt. %, more preferably in the concentration range of 0.1 to 5 wt. %.
Preferably the inventive fabric care composition further comprises a chelating agent. Preferably the chelating agent is present in the concentration range of 0.005 to 5 wt. %, more preferably in the concentration range of 0.05 to 1 wt. %. Preferably the inventive fabric care composition further comprises a nonionic surfactant. Preferably the nonionic surfactant is present in the concentration range of 0.01 to 20 wt. %, more preferably in the concentration range of 0.1 to 10 wt. %.
The inventive fabric care composition preferably contains a buffering agent to adjust the pH in the range of 7.0 to 8.5, and various adjuvants such as one or more preservatives, colorants, fragrances, and the like.
An inventive process for pretreating colored fabrics with the inventive composition is also provided which comprises the steps of presoaking the fabric by applying said composition onto the fabric in a sufficient quantity of water to wet the fabric, and allowing said composition to remain in contact with said fabric before said fabric is washed for a predetermined time as indicated below. Preferably the dye fixing agent is present in the concentration range of about 0.0008 to 0.16 wt. %, more preferably in the concentration range of about 0.008 to 0.08 wt. % in the presoak solution. Preferably the N-heterocyclic polymer is present in the concentration range of about 0.00008 to 0.08 wt. more preferably in the concentration range of about 0.0008 to 0.04 wt. % in the presoak solution. Preferably a chelating agent is present in the concentration range of about 0.00004 to 0.04 wt. %, more preferably in the concentration range of about 0.0004 to 0.008 wt. % in the presoak solution. Preferably the presoak time is in the range of about 10 minutes to 12 hours, more preferably about 10 to 60 minutes. Typically the presoak temperature is in the range of about 60 F to 90 F.
The presoak solution more preferably contains a buffering agent to adjust the pH in the range of 7.0 to 8.5 and various adjuvants such as one or more preservatives, colorants, fragrances, and the like.
An inventive process for washing colored fabrics with the inventive composition is also provided comprising the steps of adding said composition into a detergent solution for washing fabrics where said detergent solution has a concentration of surfactants in the range of about 1.0 to 0.08 wt %.
Useful detergent products typically have a concentration of surfactants in the range of about 20 to 40 wt %. Preferably the detergent surfactants includes at least one anionic surfactant selected from sodium alkyl ethoxy sulfate, sodium alkyl benzene sulfonate, primary alcohol sulfates, and the like and which are collectively present in a concentration range of about 10 to 30 wt. %.
Preferably the dye fixing agent is present in the concentration range of about 0.0001 to 0.02 wt. %, more preferably in the concentration range of about 0.001 to 0.01 wt. % in the washing solution. Preferably the N-heterocyclic polymer is present in the concentration range of about 0.00001 to 0.01 wt. %, more preferably in the concentration range of about 0.0001 to 0.005 wt. % in the washing solution. Preferably a chelating agent is present in the concentration range of about 0.000005 to 0.005 wt. %, more preferably in the concentration range of about 0.00005 to 0.001 wt. % in the washing solution.
The washing solution preferably contains a buffering agent to adjust the pH in the range of 7.0 to 9.5, and various adjuvants such as one or more preservatives, colorants, fragrances, and the like.
Dye Fixing Agents
A component of the inventive composition is a dye fixing agent. Dye fixing agents, or “fixatives”, are well-known, commercially available materials which are designed to improve the appearance of dyed fabrics by minimizing the loss of dye from fabrics due to washing. Not included within this definition are components which are fabric softeners.
Many dye fixing agents are cationic, and are based on
Bory Barbara Helen
Kuzmenka Daniel Joseph
Muhammad Wakeelah Nai'Mah
Wolf Diane
Bornstein Alan A.
Elhilo Eisa B
Gupta Yogendra N.
Unilever Home & Personal Care USA , division of Conopco, Inc.
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