JPH0711295A - Detergent compositi0n - Google Patents

Abstract

PURPOSE:To obtain the subject new composition suitable for environment, having excellent detergency, not causing environmental problems such as eutrophication of rivers by blending a surfactant with a polyaspartate having a high content of beta-form as a builder. CONSTITUTION:The objective composition is obtained by blending a surfactant with preferably 1-50wt.% of a polyaspartate (preferably Na salt) having 5,000-100,000 weight-average molecular weight and >=50% content of beta-form. The polyaspartate is usually obtained by heating aspartic acid in the presence of phosphoric acid, dehydrating and condensing, hydrolyzing a formed polysuccinic acid imide with an aqueous solution of an alkali. A surfactant selected from a nonionic surfactant and an anionic surfactant is preferable as the surfactant to be mixed with the composition. In the case of a detergent for clothes, a nonionic surfactant in combination with an anionic surfactant are preferably used.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel detergent composition. More specifically, it relates to an environment-friendly detergent composition in which a commonly used surfactant is blended with polyaspartate as a builder component.

[0002]

2. Description of the Related Art A builder is incorporated into a detergent to improve the detergency of the detergent by its calcium-capturing ability, buffering action, dirt dispersing action and the like. Conventionally, condensed phosphates such as sodium tripolyphosphate have been used in terms of performance, safety and price. However, since these phosphorus compounds cause eutrophication in rivers, lakes, swamps, etc., their use has been restricted in recent years, and substitution with them is rapidly progressing. Currently, as a substitute for such condensed phosphorus compounds, eutrophication, zeolite that is not problematic in terms of safety is used, the zeolite is not sufficient builder performance,
Since it is insoluble in water, there are problems that it cannot be blended in a liquid detergent and that it is deposited on the laundry.

Attempts have also been made to blend low molecular weight carboxylates such as citrates and succinates as builders, but their builder ability is not sufficient and they have not been widely used. Further, polymer electrolytes such as polyacrylic acid salts and polyfumaric acid salts are known as those having excellent builder performance, but biodegradability and safety are poor, and environmental problems have not been solved yet.

On the other hand, polyaspartic acid is known as a polymer obtained from aspartic acid which is one of amino acids. Weight average molecular weight of 1,000 to 5,000, β
Those containing 50% or more of the body are used as Ca deposition inhibitors (US Pat. No. 5,116,513). However, although it is known that it has a Ca capturing ability, the detergent builder is required to have a soil dispersing action, a soil redeposition preventing action, a buffering action and the like in addition to the Ca capturing ability. Also, a patent (European Patent No. 0454126A1) in which polyaspartic acid is blended as a builder has been published,
Nothing is said about the composition of α-form / β-form.

[0005]

SUMMARY OF THE INVENTION The present invention solves the problems of existing builders. That is, an object of the present invention is to provide an environment-friendly detergent composition containing a safe, biodegradable, water-soluble builder having sufficient builder ability.

[0006]

[Means for Solving the Problems] As a result of intensive investigations by the present inventors to obtain a detergent composition suitable for the environment, the incorporation of polyaspartate having a high β-form content as a builder provides high detergency. The present invention has been completed and the present invention has been completed.

The polyaspartate used as a builder in the present invention has α- and β-isomers, but the β-form content is required to be 50% or more. If the β-form is less than this, sufficient builder ability cannot be obtained, and the detergency is reduced.

The polyaspartic acid salt used as a builder in the present invention has a weight average molecular weight of 5
000 to 100,000 is desirable. If it is lower than this, sufficient builder ability cannot be obtained. Further, if the molecular weight is higher than this, the viscosity becomes high and it is not suitable.

The method for producing the polyaspartic acid salt used in the present invention is not particularly limited. Usually, aspartic acid is heated and dehydration-condensed in the presence of phosphoric acid to synthesize polysuccinimide, and then hydrolyzed with an alkaline aqueous solution. And manufacture.

The polyaspartate may be a homopolymer of each of L-form and D-form or a copolymer of L-form and D-form.
Also, a mixture of these may be used.

Examples of salts of polyaspartic acid include alkali metal salts such as sodium and potassium, ammonium salts of ammonia or amines, and sodium salts are preferred.

The amount of polyaspartate to be added is usually
The weight ratio is 0.05 to 50%, preferably 1 to 50
%.

These polyaspartic acids are used as builder components in combination with conventionally used condensed phosphates, zeolites, or low molecular weight carboxylates such as oxadiacetate, citrate and succinate. It can be blended.

In the present invention, the surfactant used in combination with polyaspartic acid is a linear or branched alkylbenzene sulfonate, an alkyl or alkenyl ether sulfate, an alkyl or alkenyl sulfate, an α-sulfo fatty acid. Salts, alkane or alkene sulfonates, saturated or unsaturated fatty acid salts, alkyl or alkenyl ether carboxylates, amino acid type surfactants, anionic surfactants such as alkyl or alkenyl phosphate esters or salts thereof, polyalkylene glycol alkyl Nonionic surfactants such as ether, polyalkylene glycol alkyl phenyl ether, polyalkylene glycol fatty acid ester, sorbitan fatty acid ester, alkyl polyglycoside, fatty acid dialkanol amide, Quilt trimethyl ammonium chloride, cationic surfactants such as dialkyl dimethyl ammonium chloride and alkyl dimethyl amine oxide, amphoteric surfactants such as alkyl dimethyl sulfopropyl betaine. Among these, it is preferable to use at least one selected from nonionic and anionic surfactants, and it is particularly preferable to use nonionic and anionic surfactants together as a laundry detergent.

The content of the surfactant is usually 5 to 60%, preferably 10 to 60% by weight of the detergent composition.

Further, the detergent composition of the present invention can be blended in various manners depending on the type of detergent or stain, and various ingredients can be blended as necessary for use. Specifically, sodium sulfate as an inorganic acid salt, talc as an abrasive, fine powder silica, etc., hydrogen peroxide as an oxidizing bleaching agent,
Examples include sodium percarbonate and the like, sodium bisulfite as a reducing bleaching agent, and carboxymethyl cellulose, polyethylene glycol and the like as a redeposition preventing agent. In addition, components such as enzymes, fluorescent dyes, fragrances, colorants, preservatives and chelating agents can be mentioned.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to the examples.
The detergency test in the examples was conducted by the following method.

(1) Oily Stain Cloth Oleic acid 45.1% Triolein 24.9% Cholesterol oleate 19.5% Liquid paraffin 4.0% Squalene 4.0% Cholesterol 2.6% 6 wt% benzene of the above composition 2 g of solution with benzene
Diluted to 00 g to prepare an oily soil solution. 5 cm x 5 c
1 ml of this cotton knitted cloth was soaked with 1 ml of this oily soil solution and dried by ventilation.

(2) Artificial dirt cloth Gelatin 18.8% Mud 79.9% Carbon black 1.3% An artificial dirt cloth containing dirt with the above composition ratio was used.

(3) Cleaning test Cleaning conditions Cleaning tester: Terg-O-Tomert
er type tester Number of rotations of washing tester: 120 times per minute Washing liquid amount: 900ml Detergent concentration: 0.133wt% Artificial soil cloth: 10 sheets Oily soil cloth: 3 sheets Bath ratio: 30 times (wash cotton knitted fabric) Cloth 5
* 5 cm is added for adjustment) Cleaning temperature: 25 ° C Cleaning time: 5 minutes Rinse temperature: 25 ° C Rinse time: 3 minutes × 2 times

(4) Evaluation of Detergency The reflectance of dirty cloth, cleaning cloth, and clean cloth was measured with a reflectometer,
The detergency was calculated by the following formula (Kubelka-Munk formula).

(5) Calculation of Relative Detergency Using sodium tripolyphosphate as a detergency of "10" and sodium oxadiacetate as a detergency of "0", the following formula was used. STPP: sodium tripolyphosphate ODA: sodium oxadiacetate

Example 1 Each component having the following composition was dissolved in 1 liter of water. Sodium n-dodecylbenzenesulfonate 3.70 g (20.0%) (Purity 65% in water) No. 2 sodium silicate 0.60 g (5.0%) Sodium carbonate (anhydrous) 0.36 g (3.0 %) Sodium carboxymethyl cellulose 0.06 g (0.5%) Sodium sulfate (anhydrous) 5.58 g (46.5%) Mw = 22,900 (LALL) in 100 ml of this solution.
0.3 g of sodium polyaspartate (molecular weight measured by S method) (β-form 65%) was dissolved to prepare a detergent solution, and a detergency test was conducted under the above conditions. The results are shown in Table 1 (Table 1). The β-form content of polyaspartic acid is ¹³ C-NM.
Analyzed by R. [Biopolymers, Vo
l. 20, 1605-1614 (1981)]

Example 2 A detergent solution was prepared in the same manner as in Example 1 except that sodium polyaspartate (70% β-form) having Mw = 8,100 (molecular weight measured by LALLS method) was used, and a detergency test was conducted. The results are shown in Table 1 (Table 1).

Comparative Example 1 Mw = 12,000 (molecular weight measured by LALLS method)
A detergent solution was prepared and a detergency test was conducted in the same manner as in Example 1 except that the sodium polyaspartate (25%) was used in Example 1 and the results are shown in Table 1.

Comparative Example 2 A detergent solution was prepared and a detergency test was conducted in the same manner as in Example 1 except that sodium polyaspartate (β-form 70%) having Mw = 4000 (molecular weight measured by LLALS method) was used. The results are shown in Table 1 (Table 1).

Comparative Example 3 A detergent solution was prepared and a detergency test was conducted in the same manner as in Example 1 except that sodium tripolyphosphate was used instead of sodium polyaspartate, and the results are shown in Table 1 (Table 1). .

Comparative Example 4 A detergent solution was prepared and a detergency test was conducted in the same manner as in Example 1 except that sodium oxadiacetate was used instead of sodium polyaspartate, and the results are shown in Table 1 (Table 1). .

Comparative Example 5 A detergent solution was prepared and a detergency test was conducted in the same manner as in Example 1 except that zeolite was used instead of sodium polyaspartate, and the results are shown in Table 1 (Table 1). Comparative Example 6 A detergent solution was prepared in the same manner as in Example 1 without using sodium polyaspartate, and a detergency test was conducted. The results are shown in Table 1 (Table 1) (blank test).

[0030]

[Table 1]

As shown in Table 1, the detergent composition of the present invention showed excellent detergency almost equal to that of the composition containing sodium tripolyphosphate.

[0032]

The detergent composition of the present invention contains a biodegradable builder, has excellent detergency, and has environmental problems such as eutrophication of rivers, which is a problem with phosphoric acid condensation products. Is useful because it does not cause

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masanobu Amioka 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Akihiro Yamaguchi 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Kagaku Within the corporation

Claims (1)

[Claims] 1. A weight average molecular weight of 5,000 to 100,
And a polyaspartate having a β-form content of 50% or more is blended.