JPS6025936A - Production of gel having reproducible gel strength - Google Patents

Abstract

PURPOSE:To obtain a gel spreadable smoothly on the skin and developing high strength rapidly and reproducibly after application, by compounding a carboxyl- containing water-soluble polymer, a synthetic aluminum silicate and dihydroxyaluminum aminoacetate to a carrier and water at specific ratios. CONSTITUTION:A carrier such as polyethylene glycol, glycerol, etc. and water are compounded with (A) a carboxyl-containing water-soluble polymer or its salt (e.g. polyacrylic acid salt), (B) a synthetic aluminum silicate and (C) dihydroxyaluminum aminoacetate. The amounts of the components A, B and C are 67.5-74.0(wt)% (preferably 68.5-73.5%), 20.0-27.5% (preferably 21.0-25.0%) and 4.0-9.5% (preferably 5.0-8.0%), based on A+B+C, respectively. The component A is preferably a mixture of a polyacrylic acid salt and about 1-3% polyacrylic acid and the pH of the system is maintained to preferably 8.0-6.5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides gels for bags, etc., that exhibit sufficient spreadability when applied to a support and quickly exhibit a certain level of strength after application, with good reproducibility. It relates to a manufacturing method for obtaining.

BACKGROUND ART It has been known to form a gel by coexisting a certain amount or more of polyvalent metal ions with a soluble polymer of an aliphatic carboxylic acid or its salt, for example, as a raw material for gels used in bag agents and the like.

However, this type of gel has drawbacks such as the inability to obtain a homogeneous gel because the reaction occurs extremely rapidly, and it is difficult to obtain a homogeneous gel even if it meets the various conditions required for this type of gel. The current situation is that there is no one.

Specifically, for example, it has been reported that there has been an attempt to obtain a uniform gel by slowly gelling a poorly soluble aluminum compound in the presence of an organic acid (%
No. 106598).

However, the aluminum compounds used in this case include, for example, aluminum hydroxide, aluminum chloride,
Salts of inorganic or organic acids such as aluminum sulfate, aluminum acetate, and aluminum stearate, double salts such as aluminum alum, aluminum salts such as sodium aluminate, inorganic aluminum complex salts, and organic aluminum chelate compounds. Since the reaction is carried out by eluting aluminum ions while using a uniformly large amount of acid and alkaline tubes, considering the actual operation, the process is complicated. Not only that, but there were also concerns about the reproducibility of the strength characteristics of the resulting gel, leaving room for further improvement.

Apart from this, a method has also been proposed in which a water-permeable sheet is embedded in a sheet-like high water content gel body to improve its strength (f% Publication No. 18917/1983), but this method also requires It was complicated and further essential improvements were desired.

This invention has been developed in accordance with the above-mentioned requirements, and has been developed for a gel used when coating a gel on a support to form a support such as a bag agent, while exhibiting excellent spreadability during the coating process. After completing the process, they quickly discovered and completed a method for producing a gel that exhibited high strength with good reproducibility.

That is, the present invention provides a water-soluble polymer or a salt thereof (P
In producing a gel by blending l, synthetic aluminum silicate (81) and dihydroxyaluminum aminoacetate, P: 67.5 in the total amount of p and s.
-74.0% by weight, S: 20.0-27.5% by weight, and A: 0.5-9.5% by weight. It is something.

The carrier referred to in the present invention is one that has a substantial affinity with water and exhibits water-retaining properties, such as polyethylene. The term refers to substances that are viscous liquid at room temperature and do not irritate the skin, such as licor, polypropylene glycol, and glycerin.

The amount of this carrier used is approximately 15 to 25% by weight of the product Rurugel.

In the present invention, a carboxyl group-containing water-soluble polymer or a salt thereof is used to form a gel body that has self-shape retention, spreadability, and thermal stability due to the reaction product with an aluminum compound described below. use.

A typical example of this ag polymer is polyacrylate, which shows a tendency to generally improve the physical properties of poultices when its average degree of polymerization increases. However, when the viscosity increases significantly, the workability of coating onto a support deteriorates. Therefore, it is generally preferable to use a polymer having an average degree of polymerization of about 104 to 105.

The salt-forming cation for the polymer is generally selected from sodium and potassium. Other salt-forming cations, such as alkanolamines, amines, or ammonium, may be used in some cases, but these generally pose some concerns regarding decomposition and odor generation during long-term storage, and Other cations are often impractical due to their price.

In addition to this, carboxymethylene, which is commonly referred to as carboxyvinyl polymer, can also be used to provide such an effect.

In the present invention, in addition to the above-mentioned materials, synthetic aluminum silicate is used, which is not only lighter and finer than natural products and extremely convenient for maintaining a dispersed state, but also the aforementioned carrier, polysilicate, etc. The acrylate and dihydroxyaluminum aminoacetate (described below) interact with each other to promote the reaction with good reproducibility.

Apart from this, in the present invention, dihydroxyaluminum amine acetate is used, and its function is that it is blended with each of the above-mentioned components, and the - of the system is approximately 8.0 to 6.
It is believed that by keeping the temperature between 5 and 5, partial hydrolysis of F occurs to liberate glycine and facilitate the reaction between the polyacrylate and aluminum.

- When adjusting polyacrylic acid, polyacrylic acid is used in a range of about 1 to 3% by weight based on polyacrylate, but this acid has excellent compatibility with polyacrylate and This has the effect that it is not considered as the addition of an extra component.

A water-soluble polymer containing a carboxyl group or a salt thereof (P) as described above and a synthetic aluminum silicate (81 and amine dihydroxyaluminum acetate), P based on the total amount: 67.5 to 74.0 weight %, s:
20.0-27.5 heavy fi% oxO:h: 4.0
By using -9.5 weight ratio, the purpose of the present invention can be fully achieved and its effects can be enjoyed.
Preferably, the above range is P: 68.3 to 76.5% by weight.
, S:21. O~25.0% by weight and A: 5.0~8
．． 0% by weight. The present invention will be specifically described below based on Examples.

Example 1 Each component of the following formulation was mixed and stirred until the whole was uniform (pH approximately), then heated and stirred at 60°C for 60 minutes, then cooled to 40°C and spread into a nonwoven fabric. However, the workability was extremely good.

Parts by weight Glycerin 600 Sodium polyacrylate (trade name, Aronbis S) 15
0 Amino dihydroxyaluminum acetate (trade name, Glycinal) 15 Synthetic aluminum silicate 50 Kosei water 800 Example 2 Gel constituents of the following formulation were kneaded in the same manner as in Example 1, cooled to 40°C, and then L-men ) 10 parts by weight of d/-camphor, 10 parts by weight of d/-camphor and 15 parts by weight of salicylic acid were added and mixed uniformly.

This was spread on a non-woven fabric support, and as in Example 1, the workability was extremely good. Weight parts Glycerin: 300 Anbis S (trade name, above) 15° Polyacrylic acid (trade name) , Shunron) 15 Glycinal (trade name, above) 15 Synthetic aluminum silicate 5° Purified water 1200 Example 3 The gel strength of the gel body obtained in Example 1 and Process 2 was measured. The stress (gl
was taken as the measured regel strength.

Run, 4 1 2 3 4 5 X-Example 1 28
26 -28 25 27 26.8 Example 2 20
21 21 19 20 20.2 It was observed that a gel body with extremely high reproducibility was obtained with little variation in the gel strength as described above.

Agent: Patent Attorney Sanro Kimura 22

Claims (1)

[Claims] When producing a gel by blending a water-soluble polymer containing a carboxyl group or its salt fP as an essential component with a carrier and water, synthetic aluminum silicate (81) and amine dihydroxyaluminum acetate (5), P, S
and P in the total amount of A: 67.5 to 74.0 weight i
%, S: 120.0-27.5% by weight and A: 0.
A method for producing a gel having a gel strength with good reproducibility, characterized in that the weight ratio is 5 to 9.5.