Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2001-01-26
2002-07-16
Delcotto, Gregory (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S228000, C510S230000, C510S231000, C510S232000, C510S233000, C510S380000, C510S477000, C510S488000, C510S512000
Reexamination Certificate
active
06420328
ABSTRACT:
FIELD OF INVENTION
The present invention relates generally to an automatic dishwasher detergent composition in the form of an aqueous liquid, wherein the composition is pink in color.
BACKGROUND OF THE INVENTION
Liquid automatic dishwasher detergent compositions, both aqueous and nonaqueous, have recently received much attention, and the aqueous products have achieved commercial popularity.
The acceptance and popularity of the liquid formulations as compared to the more conventional powder products stems from the convenience and performance of the liquid products. However, even the best of the currently available liquid formulations still suffer from two major problems, product phase instability and bottle residue, and to some extent cup leakage from the dispenser cup of the automatic dishwashing machine as well as unacceptable color appearance.
Representative of the relevant patent art in this area, mention is made of Rek, U.S. Pat. No. 4,556,504; Bush, et al., U.S. Pat. No. 4,226,736; Ulrich, U.S. Pat. 4,431,559; Sabatelli, U.S. Pat. No. 4,147,650; Paucot, U.S. Pat. No. 4,079,015; Leikhem, U.S. Pat. No. 4,116,849; Milora, U.S. Pat. No. 4,521,332; Jones, U.S. Pat. No. 4,597,889; Heile, U.S. Pat. No. 4,512,908; Laitem, U.S. Pat. No. 4,753,748; Sabatelli, U.S. Pat. No. 3,579,455; Hynam, U.S. Pat. No. 3,684,722: other patents relating to thickened detergent compositions include U.S. Pat. No. 3,985,668; U.K. Pat. No. Applications GB 2,116,199A and GB 240,450A; U.S. Pat. No. 4,511,487; U.S. Pat. No. 4,752,409 (Drapier, et al.); U.S. Pat. No. 4,801,395 (Drapier, et al.); U.S. Pat. No. 4,801,395 (Drapier, et al.).
All of the prior art examples are yellow in yellow. The instant compositions are bleach stable and pink in appearance.
SUMMARY OF THE INVENTION
According to the present invention there is provided a novel aqueous liquid automatic dishwasher detergent composition which is pink in color and bleach stable. The composition is characterized by its substantially indefinite stability against phase separation or settling of dissolved or suspended particles, low levels of bottle residue, relatively high bulk density, a pink colored composition which is stable in the presence of bleach and substantial absence of unbound or free water. This unique combination of properties is achieved by virtue of the incorporation into the aqueous mixture of dishwashing detergent surfactant, optionally, an alkali metal detergent builder salt(s), chlorine bleach compound, an effective amount of high molecular weight cross-linked polyacrylic acid type thickening agent; a physical stabilizing amount of a long chain fatty acid or salt thereof; optionally, a noncrosslinked polyacrylate type polymer and a bleach stable red colorant thereby forming a pink colored liquid gelled automatic dishwashing composition. The compositions are further characterized by a bulk density of at least 1.24 g/cc, such that the density of the polymeric phase and the density of the aqueous (continuous) phase are approximately the same.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The compositions of this invention are pink colored, aqueous liquids containing various cleansing active ingredients, detergent adjuvants, structuring and thickening agents and stabilizing components, although some ingredients may serve more than one of these functions.
The advantageous characteristics of the compositions of this invention, including a bleach stable pink color physical stability, low bottle residue, high cleaning performance, e.g. low spotting and filming, food removal, and so on, and superior aesthetics, are believed to be attributed to several interrelated factors such as low solids, i.e. undissolved particulate content, product density and linear viscoelastic rheology. These factors are, in turn, dependent on several critical compositional components of the formulations, namely, (1) the inclusion of a thickening effective amount of polymeric thickening agent having high water absorption capacity, exemplified by high molecular weight cross-linked polyacrylic acid, (2) inclusion of a physical stabilizing amount of a long chain fatty acid or salt thereof, (3) a product bulk density of at least 1.24 g/cc, such that the bulk density and liquid phase density are about the same.
The pink colored, liquid gelled automatic dishwashing composition comprises approximately by weight:
(a) 0.1% to 55%, more preferably 5% to 40% of an inorganic compound containing alkali metal cations, preferably sodium ions, wherein said inorganic compound is selected from the group consisting of alkali metal detergent builder salts, alkali metal hydroxides and alkali metal silicates and mixtures thereof;
(b) 0.1% to 5% of at least one chlorine bleach stable, water-dispersible organic detergent active material;
(c) 0 to 2%, more preferably 0.05% to 1.75% chlorine bleach stable foam depressant;
(d) at least one chlorine bleach compound in an amount to provide about 0.2% to 4% of available chlorine;
(e) 0.1% to 2.5%, more preferably 0.2% to 1.5% of a high molecular weight hydrophilic cross-linked polyacrylic acid thickening agent;
(f) 0 to 5%, more preferably 0. 1% to 4.0% of a low molecular weight non-crosslinked polyacrylate-type polymer;
(g) 0 to 2%, more preferably 0.05% to 1% of a long chain fatty acid or a metal salt of a fatty acid;
(h) 0.001% to 0.5%, more preferably 0.001% to 0.2% of a F203 C.l. Pigment Red 1010 colorant; and
(i) the balance being water, wherein the composition is pink in color and has chromaticity coordinate values of x from about 0.3142 to about 0.3300 and, more preferably about 0.3162 to about 0.3290 and y from about 0.3233 to about 0.3450, more preferably 0.3253 to 0.3425. The x and y values were obtained from the tristimulus values (x, y and z) obtained from measurements made using a QA Master spherical spectrophotometer (X-Rite Corp.), 10 degree observer, D65 illuminant at 25° C. and calibrated BTILL=barium sulfate, reflectance mode, specular component included, UV component included, large area view (sample and lens). CIELAB coordinates in the CIELAB system for the composition are (a) equals from about 1.25 to about 1.75, more preferably about 1.30 to about 1.64 and (b) from about −0.1 to about +4.0, more preferably from about −0.05 to about +3.5; L is about 28 to about 40, more preferably about 30 to about 39, C is about 1.0 to about 4, more preferably about 1.25 to about 3.75 and h is about −0.1 to about +0.1, more preferably about −0.05 to about +0.05.
Exemplary of the cross-linked polyacrylic acid-type thickening agents are the products sold by B.F. Goodrich under their Carbopol trademark, especially Carbopol 941, which is the most ion-insensitive of this class of polymers, and Carbopol 940 and Carbopol 934. The Carbopol resins, also known as “Carbomer”, are hydrophilic high molecular weight, cross-linked acrylic acid polymers having an average equivalent weight of 76, and the general structure illustrated by the following formula:
Carbopol 941 has a molecular weight of 1,250,000; Carbopol 940 a molecular weight of approximately 4,000,000 and Carbopol 934 a molecular weight of approximately 3,000,000. The Carbopol resins are cross-linked with polyalkenyl polyether, e.g. 1% of a polyallyl ether of sucrose having an average of 5.8 allyl groups for each molecule of sucrose. Further detailed information on the Carbopol resins is available from B.F. Goodrich, see, for example, the B.F. Goodrich catalog GC-67, Carbopol® Water Soluble Resins.
While most favorable results have been achieved with Carbopol 614 or 617 from BF Goodrich or the Polygel series from 3V Company, preferably Polygel TL, other lightly cross-linked polyacrylic acid-type thickening agents can also be used in the compositions of this invention. As used herein “polyacrylic acid-type” refers to water-soluble homopolymers of acrylic acid or methacrylic acid or water-dispersible or water-soluble salts, esters or amides thereof, or water-soluble copolymers of these acids of their salts, esters or ameides with each ot
Colgate-Palmolive Co.
Delcotto Gregory
Enanfeld Richard
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