Hard surface cleaning compositions comprising modified...

Details Hard surface cleaning compositions comprising modified... Hard surface cleaning compositions comprising modified...

1999-12-15

2001-10-16

Ogden, Necholus (Department: 1751)

Cleaning compositions for solid surfaces, auxiliary compositions

Cleaning compositions or processes of preparing

For cleaning a specific substrate or removing a specific...

C510S424000, C510S426000, C510S428000

Reexamination Certificate

active

06303556

ABSTRACT:

FIELD OF THE INVENTION
This invention relates to hard surface cleaning products comprising particular types of improved alkylbenzene sulfonate surfactant mixtures adapted for use by controlling compositional parameters, especially a 2/3-phenyl index and a 2-methyl-2-phenyl index.
BACKGROUND OF THE INVENTION
The developer and formulator of surfactants for hard surface cleaning must consider a wide variety of possibilities with limited (sometimes inconsistent) information, and then strive to provide overall improvements in one or more of a whole array of criteria, including performance in the presence of free calcium in complex mixtures of surfactants and polymers, e.g. cationic polymers, formulation changes, enzymes, various changes in consumer habits and practices, and the need for biodegradability.
Further, hard surface cleaning should employ materials that enhance the tolerance of the system to hardness, especially to avoid the precipitation of the calcium salts of anionic surfactants. Precipitation of the calcium salts of anionic surfactants is known to cause unsightly deposits on hard surfaces, especially dark hard surfaces. In addition, precipitation of surfactants can lead to losses in performance as a result of the lower level of available cleaning agent. In the context provided by these preliminary remarks, the development of improved alkylbenzene sulfonates for use in hard surface cleaning compositions is clearly a complex challenge. The present invention relates to improvements in such surfactant compositions.
It is an aspect of the present invention to provide mixtures of the modified alkylbenzene sulfonate surfactant mixtures which are formulatable to provide cleaning compositions having one or more advantages, including greater product stability at low temperatures, increased resistance to water hardness, greater efficacy in surfactant systems, filming and streaking, improved removal of greasy or particulate body soils, and the like.
BACKGROUND ART
U.S. Pat. Nos. 5,659,099, 5,393,718, 5,256,392, 5,227,558, 5,139,759, 5,164,169, 5,116,794, 4,840,929, 5,744,673, 5,522,984, 5,811,623, 5,777,187, WO 9,729,064, WO 9,747573, WO 9,729,063, U.S. Pat. Nos. 5,026,933; 4,990,718; 4,301,316; 4,301,317; 4,855,527; 4,870,038; 2,477,382; EP 466,558, Jan. 15, 1992; EP 469,940, Jan. 5, 1992; FR 2,697,246, Apr. 29, 1994; ; SU 793,972, Jan. 7, 1981; U.S. Pat. Nos. 2,564,072; 3,196,174; 3,238,249; 3,355,484; 3,442,964; 3,492,364; 4,959,491; WO 88/07030, Sep. 9, 1990; U.S. Pat. Nos. 4,962,256, 5,196,624; 5,196,625; EP 364,012 B, Feb. 15, 1990; U.S. Pat. Nos. 3,312,745; 3,341,614; 3,442,965; 3,674,885; 4,447,664; 4,533,651; 4,587,374; 4,996,386; 5,210,060; 5,510,306; WO 95/17961, Jul. 6, 1995; WO 95/18084; U.S. Pat. Nos. 5,510,306; 5,087,788; 4,301,316; 4,301,317; 4,855,527; 4,870,038; 5,026,933; 5,625,105 and U.S. Pat. No. 4,973,788. See Vol 56 in “Surfactant Science” series, Marcel Dekker, New York, 1996, including in particular Chapter 2 entitled “Alkylarylsulfonates: History, Manufacture, Analysis and Environmental Properties”, pages 39-108, “Surfactant Science” series, Vol 73, Marcel Dekker, New York, 1998 and “Surfactant Science” series, Vol 40, Marcel Dekker, New York, 1992. See also copending U.S. patent applications Ser. No. 60/053,319 filed on Jul. 21, 1997, Ser. No. 60/053,318, filed on Jul. 21, 1997, Ser. No. 60/053,321, filed on Jul. 21, 1997, Ser. No. 60/053,209, filed on Jul. 21, 1997, Ser. No. 60/053,328, filed on Jul. 21, 1997, Ser. No. 60/053,186, filed on Jul. 21, 1997 and the art cited therein. Documents referenced herein are incorporated in their entirety.
SUMMARY OF THE INVENTION
The present invention provides a hard surface cleaning compositions comprising a modified alkylbenzene sulfonate surfactant mixtures and a conventional surface cleansing additive.
Specifically, the first embodiment of the present invention comprises a hard surface cleaning composition comprising:
(i) from about 0.01% to about 95%, preferably from about 1% to about 50%, preferably from about 2% to about 30%, by weight of composition of a modified alkylbenzene sulfonate surfactant mixture comprising:
(a) from about 60% to about 95%, preferably from about 65% to about 90%, more preferably from about 70% to about 85%, by weight of surfactant mixture, a mixture of branched alkylbenzene sulfonates having formula (I):
wherein L is an acyclic aliphatic moiety consisting of carbon and hydrogen, said L having two methyl termini and said L having no substituents other than A, R
1
and R
2
; and wherein said mixture of branched alkylbenzene sulfonates contains two or more, preferably at least three, optionally more, of said branched alkylbenzene sulfonates differing in molecular weight of the anion of said formula (I) and wherein said mixture of branched alkylbenzene sulfonates has
a sum of carbon atoms in R
1
, L and R
2
of from 9 to 15, preferably from 10 to 14;
an average aliphatic carbon content, i.e., based on R
1
, L and R
2
and excluding A, of from about 10.0 to about 14.0 carbon atoms, preferably from about 11.0 to about 13.0, more preferably from about 11.5 to about 12.5; M is a cation or cation mixture, preferably M is selected from H, Na, K, Ca, Mg and mixtures thereof, more preferably M is selected from H, Na, K and mixtures thereof, more preferably still, M is selected from H, Na, and mixtures thereof, M having a valence q, typically from 1 to 2, preferably 1; a and b are integers selected such that said branched alkylbenzene sulfonates are electroneutral (a is typically from 1 to 2, preferably 1, b is 1); R
1
is C
1
-C
3
alkyl, preferably C
1
-C
2
alkyl, more preferably methyl; R
2
is selected from H and C
1
-C
3
alkyl (preferably H and C
1
-C
2
alkyl, more preferably H and methyl, more preferably H and methyl provided that in at least about 0.5, more preferably 0.7, more preferably 0.9 to 1.0 mole fraction of said branched alkylbenzene sulfonates, R
2
is H); A is a benzene moiety (typically A is the moiety —C
6
H
4
—, with the SO
3
moiety of Formula (I) in para-position to the L moiety, though in some proportion, usually no more than about 5%, preferably from 0 to 5% by weight, the SO
3
moiety is ortho- to L); and
(b) from about 5% to about 40%, preferably from about 10% to about 35%, more preferably from about 15% to about 30%, by weight of surfactant mixture, of a mixture of nonbranched alkylbenzene sulfonates having formula (II):
wherein a, b, M, A and q are as defined hereinbefore and Y is an unsubstituted linear aliphatic moiety consisting of carbon and hydrogen having two methyl termini, and wherein said Y has a sum of carbon atoms of from 9 to 15, preferably from 10 to 14, and said Y has an average aliphatic carbon content of from about 10.0 to about 14.0, preferably from about 11.0 to about 13.0, more preferably 11.5 to 12.5 carbon atoms; and
wherein said modified alkylbenzene sulfonate surfactant mixture is further characterized by a 2/3-phenyl index of from about 275 to about 10,000, preferably from about 350 to about 1200, more preferably from about 500 to about 700; and also preferably wherein said modified alkylbenzene sulfonate surfactant mixture has a 2-methyl-2-phenyl index of less than about 0.3, preferably less than about 0.2, more preferably less than about 0.1, more preferably still, from 0 to 0.05;
(ii) from about 0.001% to 99.9% by weight of a conventional surface cleansing additive;
wherein said composition is further characterized by a 2/3-phenyl index of from about 275 to about 10,000.
In accordance with the second embodiments of the present invention, there are encompassed herein a number of alternate embodiments, such as those in which there is blending of the novel modified alkylbenzene sulfonate surfactant mixture of the invention with one or more other alkylbenzene sulfonate surfactants. In practical terms, such blending is usually encompassed before sulfonation and detergent formulation, but the outcome is a hard surface cleaning composition containing a blend of the novel modified alkylbenzene sulfonate surfactant with other, known, alkylbe

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