Aqueous solution of an alpha sulfonate surfactant comprising...

Details Aqueous solution of an alpha sulfonate surfactant comprising... Aqueous solution of an alpha sulfonate surfactant comprising...

2000-06-08

2001-02-06

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...

C510S119000, C510S123000, C510S121000, C510S125000

Reexamination Certificate

active

06184190

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a method of producing a colorless aqueous solution of an alpha olefin sulfonate which can be subsequently used in the formation of cleaning compositions.
BACKGROUND OF THE INVENTION
Alpha olefin sulfonates are used in liquid dish cleaning compositions and hard surface cleaning compositions.
Commercial alpha olefin sulfonate surfactants are usually supplied as a 35 to 45 wt. % aqueous solution. These solutions have a distinctive yellowish color which limits the use of alpha olefin sulfonate surfactant in colorless liquid cleaning compositions. The present inventions teach a method of producing a colorless aqueous solution of 35 wt. % to 45 wt. % of alpha olefin sulfonate from a commercial 35 wt. % to 45 wt. % aqueous solution of alpha olefin sulfonate which is yellowish in color. The addition of hydrogen peroxide and caustic soda to the commercially aqueous solution of the alpha olefin sulfonate causes oxidation of the containments which cause the yellowish color.
SUMMARY OF THE INVENTION
The instant invention relates to a process for producing an aqueous solution of about 5 wt. % of a C
14
-C
16
alpha olefin sulfonate which has a Klett color of less than about 12, preferably less than about 11 and most preferably less than about 10.
The present invention also relates to 30 to 40 wt. % solution of a C
14
-C
16
alpha olefin sulfonate. When the 30 to 40 wt. % solution of the C
14
-C
16
alpha olefin sulfonate is diluted with water to a 5 wt. % aqueous solution of the C
14
-C
16
alpha olefin sulfonate, the 5 wt. % solution of the C
14
-C
16
alpha olefin sulfonate has a Klett color of less than about 12, more preferably less than about 11 and most preferably less than about 10.
The present invention further relates to cleaning compositions having improved color.
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to a process for forming a solution of 30 wt. % to 40 wt. % of a C
14
-C
16
alpha olefin sulfonate and 60 wt. % to 70 wt. % of water, wherein the solution, when diluted to 5 wt. %, with distilled water has a Klett color of less than 12, preferably less than 11 and most preferably less than 10 which comprises the steps of:
(a) forming a solution having a pH of 10 to 12 by adding of 0.001 wt. % to 0.1 wt. % of sodium hydroxide to 99.9 wt. % to 99.999 wt. % of an initial solution of 30 wt. % to 40 wt. % of a C
14
-C
16
alpha olefin sulfonate and 40 wt. % to 60 wt. % of water having a pH of 7.5 to 9.5, wherein said initial solution when diluted to 5 wt. % of C
14
-C
16
alpha olefin sulfonate has a Klett color of greater than 20;
(b) adding 1 wt. % to 2 wt. % of a 25 wt. % to 35 wt. % hydrogen peroxide solution to said 30 wt. % to 40 wt. % solution of alpha olefin sulfonate;
(c) mixing for 6 hours to 48 hours at 77° F. to 150° F. the 30 wt. % to 40 wt. % solution of C
14
-C
16
alpha olefin sulfonate, sodium hydroxide and hydrogen peroxide, wherein said solution has a pH of about 7 to about 9;
(d) adding 0.001 wt. % to 0.005 wt. % of an alkali metal hydroxide such as sodium hydroxide to said 30 wt. % to 40 wt. % solution of C
14
-C
16
alpha olefin solution, sodium hydroxide and hydrogen peroxide to form said color improved solution of said C
14
-C
16
alpha olefin sulfonate having a pH of about 10 to about 12 which when diluted to 5 wt. % of said C
14
-C
16
alpha olefin sulfonate has a Klett color of less than 12, preferably less than 11, and most preferably less than 10.
The present invention also relates to a solution of 30 wt. % to 40 wt. % of a C
1 4
-C
16
alpha olefin sulfonate and 60 wt. % to 70 wt. % of water which said solution has a pH of about 10 to about 12 and when diluted to 5 wt. % of said C
14
-C
16
alpha olefin sulfonate has a Klett color of less than 12, preferably less than 11 and most preferably less than 10.
An object of the present invention is to provide a cleaning composition having improved color wherein said cleaning composition contains an aqueous solution of a C
14
-C
16
alpha olefin sulfonate, wherein a 5 wt. % aqueous solution of said C
14
-C
16
alpha olefin sulfonate has a Klett color of less than 12, preferably less than 11 and most preferably less than 10.
The present invention also relates to light duty liquid cleaning composition comprising approximately by weight:
(a) 3% to 50% of a 30% to 40% aqueous solution of a C
14
-C
16
alpha olefin sulfonate, wherein the 30% to 40% aqueous solution of said C
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-C
16
alpha olefin sulfonate which has a Klett color of less than 12 when diluted with water to a 5% aqueous solution of said C
14
-Cl
6
alpha olefin sulfonate;
(b) 0.5% to 35% of at least one surfactant selected from the group consisting of ethoxylated nonionic surfactants, ethoxylated/propoxylated nonionic surfactant, zwitterionic surfactants, amine oxide surfactants, alkyl monoalkanol amide, paraffin sulfonate surfactants, linear alkyl benzene sulfonate surfactants, alkyl sulfate surfactants, ethoxylated alkyl ether sulfate surfactants, C
12
-C
14
fatty acid alkanol amides, and alkyl polyglucoside surfactants and mixtures thereof;
(c) 0 to 15%, more preferably 0.1% to 8% of at least one solubilizing agent;
(d) 0 to 2.5%, more preferably 0.1% to 1.5% of a proton donating agent;
(e) 0 to 3%, more preferably 0.1% to 2% of a disinfecting agent; and
(f) the balance being water.
The present invention also relates to a body cleaning composition:
(a) 3% to 30% of a 30% to 40% of said C
14
-C
16
alpha olefin sulfonate which aqueous solution of a C
14
-C
16
alpha olefin sulfonate, wherein 30% to 40% of the aqueous solution has a Klett color of less than 12 when diluted with water to a 5% aqueous solution of said C
14
-C
16
alpha olefin sulfonate;
(b) 0.1% to 8% of a C
8
-C
16
alkyl polyglucoside preferably decyl polyglucoside;
(c) 0.05% to 2%, more preferably 0.1% to 1% of a disinfecting agent;
(d) 0.1% to 8%, more preferably 0.5% to 6% of a zwitterionic surfactant;
(e) 0 to 1.5%, more preferably 0.1% to 1% of a proton donating agent;
(f) 0.05% to 2.5% of an alkali metal halide such as sodium chloride;
(g) 0.05% to 1%, more preferably 0.1% to 0.8% of 1,3-Bis(Hydroxy methyl)-5,5-Dimethylimidazolidine-2,4-dione(+) which is manufactured by Lonza, Inc. under the tradename of Glydant Plum™; and
(h) the balance being water, wherein the composition has a pH of about 2.8 to about 7.0 and a Brookfield viscosity at 25° C., 20 rpms, #4 spindle of about 2,500 to about 6,500 cps.
The water soluble nonionic surfactants utilized in this invention are commercially well known and include the primary aliphatic alcohol ethoxylates, secondary aliphatic alcohol ethoxylates, alkylphenol ethoxylates and ethylene-oxide-propylene oxide condensates on primary alkanols, such a Plurafacs (BASF) and condensates of ethylene oxide with sorbitan fatty acid esters such as the Tweens (ICI). The nonionic synthetic organic detergents generally are the condensation products of an organic aliphatic or alkyl aromatic hydrophobic compound and hydrophilic ethylene oxide groups. Practically any hydrophobic compound having a carboxy, hydroxy, amido, or amino group with a free hydrogen attached to the nitrogen can be condensed with ethylene oxide or with the polyhydration product thereof, polyethylene glycol, to form a water-soluble nonionic detergent. Further, the length of the polyethylene oxide chain can be adjusted to achieve the desired balance between the hydrophobic and hydrophilic elements.
The nonionic detergent class includes the condensation products of a higher alcohol (e.g., an alkanol containing 8 to 18 carbon atoms in a straight or branched chain configuration) condensed with 5 to 30 moles of ethylene oxide, for example, lauryl or myristyl alcohol condensed with 16 moles of ethylene oxide (EO), tridecanol condensed with 6 to moles of EO, myristyl alcohol condensed with about 10 moles of EO per mole of myristyl alcohol, the condensation product of EO with a cut of coconut fatty alcohol containing a mixture of fatty alcohols with alkyl chains varying from 10 to 14 carbon atoms in le

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