JP2000282100A - Liquid detergent composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject composition excellent in microbial contamination resistance and having high cleaning effects even in a weak water stream by including a surfactant and a hydrophilic compound (derivative) having phenyl group, etc., and specifying the pH. SOLUTION: This composition is obtained by including (A) 5-65 wt.% of a surfactant and (B) 0.1-30 wt.% of a hydrophilic compound (derivative) having phenyl group or phenylene group (e.g. phenoxyethanol) and (C), as necessary, an organic chelating agent, a hydrotropic agent, etc., and regulating the pH to 6-9, preferably 6-8.5, more preferably 6-8. A nonionic surfactant is preferred as the component A and a surfactant containing a compound represented by the formula R1-O-(CH2CH2O)n-(CH2CHCH3O)mR2 (R1 is a 6-18C alkyl or a 6-18C alkenyl; R2 is H, a 1-4C alkyl or a 1-4C alkenyl; n is 4-12; m is 0-5) is preferred as the nonionic surfactant.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a neutral liquid detergent composition in which microbial contamination due to long-term storage is suppressed.

[0002]

2. Description of the Related Art Clothes made of so-called delicate materials such as wool and silk have conventionally been dry-cleaned at cleaning shops. Recently, detergents and washing machines that can be used for cleaning these delicate clothes have been put on the market. Washing is also possible. In general, detergents for delicate garments for home use are designed near neutral to prevent mold collapse and shrinkage due to the pH of the detergent solution, but neutral detergent compositions are: There were problems such as susceptibility to contamination by microorganisms. For that purpose, it is known that an antibacterial agent having a skeleton of sodium benzoate, paraben or isothiazolinone is blended to suppress microbial contamination of the composition. However, these antibacterial agents give problems to the storage stability of the composition, such as precipitation of crystals. In addition, since delicate clothing is generally washed by hand or in a weak current of a washing machine, a washing effect by mechanical power cannot be obtained as compared with a case of a normal washing current. Therefore, a neutral detergent capable of obtaining high detergency even in a weak water stream has been demanded.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a neutral liquid detergent composition having excellent microbial contamination. Further, the present invention provides a neutral liquid detergent composition having a high cleaning effect even in a weak water flow.

[0004]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned problems, and as a result, have solved the above-mentioned problems of the neutral liquid detergent by combining a surfactant and a specific hydrophilic compound. The present inventors have found that they can do so, and have reached the present invention. That is, the present invention relates to (A) a surfactant, and (B)
A hydrophilic compound having a phenyl group or a phenylene group,
Or a derivative thereof, wherein the composition has a pH of 6 to 9.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. (A) The surfactant used in the present invention is a nonionic surfactant, an anionic surfactant, a zwitterionic surfactant, or a cationic surfactant. Examples of the nonionic surfactant include alcohol alkoxylates obtained by adding an alkylene oxide having 2 to 3 carbon atoms to a primary or secondary alcohol having 6 to 18 carbon atoms, and a fatty acid having 2 to 3 carbon atoms to a fatty acid having 6 to 18 carbon atoms. And higher fatty acid esters having an alkylene oxide added thereto, alkyl glycosides having an alkyl group having 6 to 20 carbon atoms, and higher fatty acid alkanolamides.

A preferred nonionic surfactant is a nonionic surfactant containing a compound represented by the following general formula (I).

[0007]

Embedded image R ¹ —O— (CH ₂ CH ₂ O) _n — (CH ₂ CHCH ₃ O) _m R ² (I)

In the above formula, R ¹ represents a branched or straight-chain alkyl or alkenyl group having 6 to 18, preferably 10 to 16, particularly preferably 12 to 14 carbon atoms. Specific examples of the alkyl group include a heptyl group, an octyl group, a nonyl group, a decyl group, an undecyl group, a dodecyl group, a tridecyl group, a butyldecyl group, and a hexadecyl group. Examples of the alkenyl group include a heptenyl group, an octenyl group, a nonenyl group, a decenyl group, an undecenyl group, a dodecenyl group, and a tridecenyl group. R ² represents hydrogen or an alkyl group or alkenyl group having 1 to 4 carbon atoms. Preferably it is hydrogen or a methyl group, particularly preferably hydrogen.

N is 4 to 12, preferably 4 to 8, particularly preferably 4 to 6. m is from 0 to 5, preferably 0
~ 3. The arrangement of ethylene oxide and propylene oxide may be block or random. Alcohol nonions in which the number of moles of alkylene oxide added is in this range can provide high washing performance even in a weak water stream.

Furthermore, at least 15% by weight, preferably 30% by weight, particularly preferably 60% by weight, of the compound of the formula (I) contained in the total nonionic surfactant used.
It is preferable to contain the above. Further, the average HLB (as defined by Griffin) of all nonionic surfactants is 9-
15, particularly preferably 9 to 12.

Furthermore, the alkylene oxide addition mole number is 0
It is preferable that the content of the low addition mole compound of 3 to 10% by weight or less, preferably 5% by weight or less, particularly preferably 3% by weight or less in the total alcohol nonion. When the alcohol nonion having a low molar number is within this range, a liquid detergent having good detergency and storage stability and good odor can be obtained. The amount of nonionic surfactant in the liquid detergent composition of the present invention is 5 to 65% by weight, preferably 15 to 60% by weight, particularly preferably 25 to 50% by weight. In this range, good detergency and stability can be obtained.

The number of moles of alkylene oxide added to the above-mentioned nonionic surfactant is as follows: ZORBA
XC8 (manufactured by DuPont) can be easily measured by high performance liquid chromatography (HPLC) using a mixed solvent of acetonitrile and water as a mobile phase.

These nonionic activators have 6 to 1 carbon atoms.
And a predetermined amount of ethylene oxide using, as a raw material, a higher alcohol of No. 8 such as a synthetic alcohol obtained by the oxo method such as Diadol (manufactured by Mitsubishi Chemical) or a natural alcohol such as Conol (manufactured by Shin Nippon Rika Co., Ltd.) Is obtained by adding

The method for producing the nonionic surfactant is not particularly limited. For example, the nonionic surfactant can be easily obtained by adding ethylene oxide to an aliphatic alcohol or the like using an alkoxylation catalyst. As the alkoxylation catalyst, for example, an alkoxylation catalyst described in JP-B-6-15038 can be used. Specifically, Al ³⁺ , Ga ³⁺ , In ³⁺ , Tl
Magnesium oxide to which metal ions such as ³⁺ , Co ³⁺ , Sc ³⁺ , La ³⁺ , and Mn ²⁺ are added can be used. Also, a preferred catalyst is an AL / Mg composite oxide catalyst obtained by calcination activation of aluminum / magnesium hydroxide described in JP-A-8-268919. According to this method, since the addition molar distribution of the alkylene oxide is narrow, the content of the target addition mole of the compound is large, and the low addition mole of the compound and the content of PEG which is a by-product are low in the nonionic interface. An activator can be obtained.

[0015] The anionic surfactants include those having 10 carbon atoms.
Alkyl benzene sulfonate having an alkyl group of from 16 to 16; alkyl ether sulfate or alkyl ether carboxylate having an alkyl or alkenyl group of 10 to 20 carbon atoms and having an ethylene oxide addition mole number of 1 to 8 mol; Examples thereof include alkyl sulfates having several tens to 20 carbon atoms, α-sulfofatty acid ester salts having 10 to 20 carbon atoms, and higher fatty acid salts having 10 to 24 carbon atoms. Among the above, preferred anionic surfactants are alkylbenzene sulfonates, alkyl ether sulfonates, alkyl ether carboxylates, and higher fatty acid salts. As higher fatty acid salts, unsaturated ones, particularly oleic acid salts, are preferred.
The anionic surfactant is preferably present in the composition at 0-2.
0% by weight, particularly preferably in the range of 0 to 10% by weight.

As the cationic surfactants, those having 10 carbon atoms
From 1 to 24 alkyl or alkenyl groups,
Preferably, an amine salt having one or a quaternary compound thereof is used. The cationic surfactant is preferably contained in the composition in the range of 0 to 10% by weight.

The amphoteric surfactants may have 8 to 18 carbon atoms.
And alkyldimethylamine oxide having an alkyl group having 8 to 18 carbon atoms. The amphoteric surfactant is preferably contained in the composition in the range of 0 to 10% by weight.

As the surfactant of the present invention, a nonionic surfactant is preferable since a particularly high detergency can be obtained.
That is, it is preferable from the viewpoint of detergency that the nonionic surfactant is 50% by weight or more, particularly 80% or more of the total surfactant. The total amount of surfactants is from 5 to 65% by weight of the composition, preferably from 15 to 60% by weight, particularly preferably 25% by weight.
５０50% by weight.

The component (B) in the present invention is a hydrophilic compound having a phenyl group or a phenylene group or a derivative thereof. Preferably, the structure contains a phenyl or phenylene group and an alkoxyl group. Preferred hydrophilic compounds are represented by formula (II).

[0020]

Embedded image X- (Ph) —O (CH ₂ CH ₂ O) _p (CH
₂ CHRO) _q Y (II)

X: hydrogen, C ₁ -C ₄ alkyl or alkenyl, hydroxyl, halogen, C ₁ -C ₄ alkoxyl Y: hydrogen, methyl, ethyl Ph: phenyl R: hydrogen , Methyl group, ethyl group p: 1 to 6, preferably 1 to 3 q: 0 to 4, preferably 0 to 2 p + q is 1 to 10, preferably 1 to 6.

Specific examples include phenoxyethanol, phenyldiethylene glycol ether, phenyltriethylene glycol ether, phenyltetraethylene glycol ether, catechol monoethylene glycol ether, catechol diethylene glycol ether, catechol triethylene glycol ether, catechol tetraethylene glycol ether, Hydroquinone monoethylene glycol ether, hydroquinone diethylene glycol ether, hydroquinone triethylene glycol ether, hydroquinone tetraethylene glycol ether, cresol monoethylene glycol, cresol diethylene glycol, cresol triethylene glycol, cresol tetraethylene glycol, etc. Rukoto can.

The component (B) is contained in the composition in an amount of 0.1 to 30.
%, Preferably 0.5% to 20%, more preferably 3%
-10%.

The liquid detergent composition of the present invention is adjusted to pH 6-9. At a higher pH, the fibers shrink significantly, and at a lower pH, good detergency cannot be obtained. The preferred pH is between 6 and 8.5, particularly preferably between 6 and 8. p
The H adjustment is carried out using an alkali hydroxide such as sodium hydroxide or potassium hydroxide, an alkanolamine such as monoethanolamine, diethanolamine or triethanolamine as an alkali agent, and hydrochloric acid, sulfuric acid or phosphoric acid as an acid. be able to.

The composition of the present invention preferably contains the following components as other components. (C) Organic chelating agent As the organic chelating agent, a phosphonic acid-based chelating agent, a carboxylic acid-based chelating agent, a polycarboxylic acid-based chelating agent, or the like can be used. Specific examples of the phosphonic acid chelating agent include ethane-1,1-diphosphonic acid, ethane-1,1,2-triphosphonate, ethane-1-hydroxy-1,1, diphosphonic acid and derivatives thereof, and ethanehydroxy 1,1,2-triphosphonic acid. Acid, ethane-1,2
-Dicarboxy-1,2-diphosphonic acid, methanehydroxyphosphonic acid and the like. Examples of the carboxylic acid-based chelating agent include citric acid, malic acid, tartaric acid, oxalic acid, nitrilotriacetic acid, ethylenediaminetetraacetic acid, diethylenetriaminepentaacetic acid and the like. Examples of the polycarboxylic acid chelating agent include polyacrylic acid, acrylic acid / methacrylic acid copolymer, (meth) acrylic acid / (meth) acrylic acid ester copolymer, (meth) acrylic acid / maleic acid copolymer and the like. Is raised.
The organic chelating agent is contained in the composition in an amount of 0 to 10% by weight, preferably 0.1 to 5% by weight. The organic chelating agent further improves the detergency of the liquid detergent of the present invention.

(D) Hydrotrope Examples of the hydrotrope include lower alcohols having 1 to 4 carbon atoms such as ethanol, methanol, propanol, glycerin, ethylene glycol and propylene glycol, sodium toluenesulfonate and sodium xylenesulfonate. . Preferred hydrotropes are lower alcohols having 2 to 3 carbon atoms. These are present in the composition in an amount of 0 to 20% by weight, preferably 0.5 to 1% by weight.
0% by weight is contained. The hydrotrope is prepared by using the composition of the present invention with a good viscosity (10 to 200 mPa ·
s, preferably 20 to 150 mPa · s), and a higher effect on stability at low temperatures can be obtained.

Other optional components contained in the liquid detergent of the present invention include enzymes such as protease, lipase, cellulase and amylase, water-soluble silicone, emulsifier,
Various components, such as an anti-redeposition agent, a fragrance, and a coloring matter, which are usually blended in a liquid detergent composition, can be blended within a range that does not impair the effects of the present invention.

[0028]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples. The liquid detergents in Table 3 were prepared and evaluated for detergency, microbial contamination, and storage stability. In Table 3, a-1 to a-
8 is a nonionic surfactant of the formula (I) shown in Table 1, b-1
-B-7 are hydrophilic solvents of the formula (II) shown in Table 2.

1) Evaluation of Detergency As a contaminated cloth, ten wet artificial soiled cloths (5 cm × 5 cm) obtained from the Laundry Science Association were used. Table 3
0.45 ml of each of the above detergent compositions was applied and left for 5 minutes. Terg-O-To of United States US Testing
Using a meter as a washing tester, 900 ml of water (3 ° DH prepared water) was added, and the mixture was washed at a bath ratio of 30 times (adjusted with a knitted cloth) at 50 rpm at 25 ° C. for 3 minutes. Water is 3 °
DH hardness adjusted water was used. The detergency was calculated according to equation (1) and the average value was determined.

[0030]

(Equation 1) (Where K / S = (1−R / 100) ² / (2R / 10
0); R is reflectance (%). Further, the cleaning cloth is a cloth after cleaning, and the original cloth is a cloth before the artificial dirt is attached. )

2) Evaluation of Microbial Contamination The composition was inoculated with Staphylococcus sp.
After standing at 35 ° C. for 72 hours, the number of bacteria in the composition was examined by a plate method, and the antibacterial effect of the composition was evaluated according to the following criteria. ：: The number of bacteria after 72 hours is 10 cfu / g or less △: The number of bacteria after 72 hours is reduced to 1/1000 or less of the initial number of bacteria ×: One thousandth of the initial number of bacteria after 72 hours Not decreased below

3) Storage stability The composition was stored for 4 weeks at 50 ° C., and the appearance was evaluated according to the following criteria. 〇: Transparent △: Light turbidity generated ×: Separation or cloudiness (crystal precipitation)

[0033]

[Table 1]

[0034]

[Table 2]

[0035]

[Table 3]

Claims (2)

[Claims] 1. A liquid detergent composition comprising (A) a surfactant and (B) a hydrophilic compound having a phenyl group or a phenylene group or a derivative thereof, wherein the composition has a pH of 6 to 9. object. 2. The liquid detergent composition according to claim 1, wherein the surfactant is a nonionic surfactant.