JPH03126797A - Emulsion composition - Google Patents

Abstract

PURPOSE:To obtain an emulsion composition exhibiting excellent emulsion stability and suitable as a neutral liquid detergent, etc., for cleaning tableware and vegetable by compounding a neutralized linear chain alkylbenzenesulfonic acid to an emulsion liquid composed of polyvinyl acetate and a compound containing carboxyl group. CONSTITUTION:The objective composition can be produced by compounding (A) an emulsion liquid composed of (i) 95-85 pts.wt. of polyvinyl acetate and (ii) 5-15 pts.wt. of a compound containing carboxyl group with (B) a compound produced by neutralizing 45-70wt.% of a linear chain alkylbenzenesulfonic acid with an alkali hydroxide and neutralizing the remaining 55-30wt.% of the acid with an amine.

Description

[Detailed description of the invention] The present invention suppresses the transparency of the emulsion liquid even after long-term storage, and exhibits excellent emulsion stability. The present invention relates to an emulsion composition that can be suitably used as a liquid detergent or the like.

Neutral liquid detergents for tableware and vegetables that spread easily are often prepared as emulsion compositions by adding emulsifiers for the purpose of increasing commercial value.

Conventionally, as a means to emulsify a liquid, Japanese Patent Application Laid-Open No. 56-1
As described in No. 33400 and No. 56-159295, crystallization methods that utilize the melting point of substances, such as crystallizing and emulsifying fatty acid diesters and glycol fatty acid esters, and methods of crystallizing polystyrene, polyvinyl acetate, etc. Methods such as emulsification using a polymer compound and dispersing water-insoluble substances such as inorganic substances such as titanium oxide and mica are known.

However, the emulsion composition obtained by the above-mentioned methods such as crystallization and dispersion may be accelerated to become transparent or separated depending on storage conditions, and the appearance of the emulsion composition may be significantly impaired.

As a countermeasure for these appearance defects, for example, Japanese Patent Application Laid-open No. 57-4.
As described in No. 8335 and No. 59-232197, it has been proposed to add a water-soluble polymer compound or a nucleating agent to an emulsion system, but the improvement effect is not sufficient and it is not effective. At present, there are almost no improvement measures.

- The present invention has been made to solve the above problems, and
An object of the present invention is to provide an emulsion composition that has excellent emulsion stability and effectively suppresses the transparency of an emulsion liquid due to solubilization of an emulsion agent.

In order to achieve the above purpose, the inventor of the present invention, as a result of intensive studies, decided to use polyvinyl acetate as an emulsifying agent, and
This is combined with a carboxyl group-containing compound in a weight ratio of 95:5 to 85:15, and furthermore, 45 to 70% of the total linear alkylbenzenesulfonic acid (
% by weight) with an alkali hydroxide such as sodium hydroxide, and the remaining 55 to 30% is neutralized with an amine such as an alkanolamine, and is blended as a surfactant. The present inventors have discovered that an emulsion composition that has excellent emulsion stability, does not cause a transparent phenomenon even after long-term storage, has a stable liquid appearance, and has high commercial value, has led to the creation of the present invention. It is something.

The present invention will be explained in more detail below.

As described above, the emulsion composition of the present invention comprises polyvinyl acetate as an emulsifying agent, a carboxyl group-containing compound in which the weight ratio of polyvinyl acetate is 5 to 15 to polyvinyl acetate 95 to 85; 45 to 70% by weight of the total is partially neutralized with alkali hydroxide, and the remaining 55 to 30% by weight contains linear alkylbenzenesulfonic acid neutralized with amine. It is used as a neutral liquid detergent for tableware and vegetables to remove dirt from metal and plastic tableware and vegetables.

Here, the polyvinyl acetate used as an emulsifier is represented by the following formula, and those having a degree of polymerization n of 350 to 700 are preferably used.

Furthermore, polyvinyl acetate has an average particle size (measured using a dynamic light scattering method manufactured by Otsuka Electronics) of 0.1 to 0.5 IXn.
are preferably used. If polyvinyl acetate having an average particle size outside the above range is used, natural gloss may not be obtained as an emulsion.

The amount of polyvinyl acetate added to the emulsion composition is 0. - ~1%, especially 0.4 to 0.6%, is preferred; if the amount is less than 0.1%, the emulsivity will be insufficient and the composition may become transparent after long-term storage. If it exceeds 1%, a natural glossy emulsion cannot be obtained, and the emulsifier may adhere to the object to be cleaned after cleaning.

In addition, as the compound containing a carboxyl group, for example, one or more of benzoic acid, sorbic acid, propionic acid, salicylic acid, etc. are preferably used, and salts of these compounds made acidic with sulfuric acid, hydrochloric acid, etc. It can be suitably used.

In this case, the carboxyl group-containing compound has a weight ratio of polyvinyl acetate/carboxyl group-containing compound of 9515.
It is used in combination with polyvinyl acetate so that the ratio is ~85/15.

When the ratio of the carboxyl group-containing compound is less than 9515, the emulsion stability of the composition deteriorates, and when it exceeds 85/15, the color tone of the polyvinyl acetate deteriorates.

On the other hand, linear alkylbenzenesulfonic acid (hereinafter referred to as LA
S-H (abbreviated as S-H) is preferably one having 10 to 18 carbon atoms, and may be a mixture thereof.

Further, examples of the alkali hydroxide used for neutralizing L A S-H include sodium hydroxide, and examples of the amine include 1-realkanolamine, particularly triethanolamine.

When LAS-H is neutralized with the above alkali hydroxide and amine, 45 to 70% of the total LAS-H, preferably 5
0-65%, more preferably 52-60% with alkali hydroxide, remaining 55-30%, preferably 50-60%
35%, more preferably 48-40% is carried out with amine. If the partial neutralization rate of L A S -H with alkali hydroxide is less than 45%, the composition will deteriorate significantly during high temperature storage, and if it exceeds 70%, the liquid stability of the composition will deteriorate during low temperature storage. do. Note that neutralization of L A S -H with sodium hydroxide and alkanolamine can be carried out by a conventional method.

In addition, it is preferable that the thus neutralized L A S -I-I be blended in an amount of 5 to 30%, particularly 15 to 25%, of the entire emulsion composition, and if the blended amount is less than 5%, the composition may be When used as a liquid cleaning agent, the cleaning power may deteriorate;
If it exceeds 0%, there may be concerns that the stability of the liquid cleaning agent will deteriorate.

As mentioned above, the emulsion composition of the present invention can be used as a liquid neutral detergent for tableware and vegetables, a liquid detergent for clothing, and other general-purpose liquid detergents. Optional components can be added in addition to the essential components. Examples of optional ingredients include alcohol ethoxylate I, alpha olefin sulfonate, organic solvents such as ethanol and isopropyl alcohol, organic acid salts such as PTS hydrochloric acid and citrate, inorganic salts such as sodium sulfate and common salt, fragrances, pigments, etc. can be mentioned.

The emulsion composition of the present invention has a stable emulsion appearance with a natural luster even when stored for a long period of time, and has excellent emulsion stability. can do.

Therefore, the composition of the present invention has high commercial value as a liquid neutral detergent for tableware and vegetables.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples. In addition, in the following examples, all percentages are percentages by weight.

The test methods adopted by each side are as follows.

Lost eye 0L raw trial wife Q [Cleaning composition 40+n stored at 50℃ for 7 days! After collecting Q into a sedimentation tube and performing centrifugation at 450 rpm for 20 minutes, the amount of sediment was observed with the naked eye and evaluated using the following criteria.

Judgment Criteria ○: No precipitate was observed, and the composition had a stable emulsion appearance with natural luster.

Δ: Precipitates are observed, but the sample has a stable emulsion appearance.

×: There are many precipitates, and the composition is transparent.

Transparency Test Method For cleaning compositions stored at 5° C. for 7 days, the right angle scattering intensity at a wavelength of 500 nm was measured using a nephelometer, and evaluated using the following criteria. The right angle scattering intensity of the cleaning composition immediately after manufacture was set at 100.

Judgment criteria ○: Right angle scattering intensity 100-80: It has a stable appearance and is not transparent.

△: Right angle scattering intensity 80-50: The liquid appearance is slightly transparent.

×: Right angle scattering intensity 50 or less: The liquid appearance is transparent and does not have a milky appearance.

[Example - ↑ O2 Comparative Examples 1 to 8] A cleaning composition having the composition shown in Table 1 was prepared, and its emulsion stability and degree of transparency were tested by the above method. Results first
Also listed in the table.

From the results in Table 1, the neutralization rate of LAS-H with sodium hydroxide was outside the range of 45 to 70% (Comparative Example 1
, 3, 4.6 to 8), when the ratio of polyvinyl acetate/carboxyl group-containing compound is outside the range of 9515 to 85/1.5 (Comparative Examples 2 and 5), the emulsion stability of the composition Although transparency was poor, it was confirmed that the compositions of the present invention (Examples 1 to 10) were excellent in emulsion stability and transparency after long-term storage.

Claims (1)

[Claims] 1. The weight ratio of polyvinyl acetate as an emulsifier to polyvinyl acetate is 5 to 15 to polyvinyl acetate 95 to 85.
a carboxyl group-containing compound, and a total of 45 to 70
% by weight is partially neutralized with alkali hydroxide, and the remaining 55~
An emulsion composition characterized in that it contains 30% by weight of a linear alkylbenzenesulfonic acid neutralized with an amine.