JPS6234942A - Crosslinking type acrylic acid polymer composition - Google Patents

Abstract

PURPOSE:A harmless, inexpensive, gelatinous composition suitable for various uses, slightly being dried, having extremely improved stability, lubricating properties and water retention characteristics, obtained by blending a specific crosslinking type acrylic acid polymer with a mixture of glycerol land water. CONSTITUTION:(A) 1pt.wt. crosslinking type acrylic acid polymer having a structural unit shown by the formula (R1 is H or methyl; R2 is H, sodiu potassi um lithium or 2-4C saturated polyhydric alcohol residue containing 2-3 hydrox yl groups; with the proviso that the whole R2 is not the saturated polyhydric alcohol residue) as a repeating unit and crosslinking points in the repeating unit is blended with (B) 19-499pts.wt. mixture containing 0.25-4pts.wt. water based on 1pt.wt. glycerin.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a water-soluble gel composition having good performance as a lubricant and a water retention agent.

[Conventional technology]

Hitherto, various natural or synthetic water-retaining and moisturizing agents have been developed and widely used for use in lubricants, aqueous gels for various purposes, cosmetics, etc. Water-based lubricants have the drawbacks of drying out relatively easily, having poor stability, decomposing and losing their function as a lubricant, and natural water-retaining and moisturizing agents are not only expensive but also The present invention has disadvantages such as being easily attacked by microorganisms, and the ability of synthetic products is not necessarily sufficient. [Problems to be solved by the invention] In view of the above circumstances, the present invention has been developed The purpose of the present invention is to provide a composition that can be used for many other purposes, including drying, is inexpensive, and has excellent lubricity, water retention, and moisture retention. ] The present invention has been made in order to achieve the above object,
The gist is that per 1 part by weight of a cross-linked acrylic acid-based polymer comprising a small number of structural units represented by the following general formula (one type is a repeating unit and a crosslinking point is present in the repeating unit),
A crosslinked acrylic acid polymer composition is obtained by adding 19 to 499 parts by weight of a mixture containing 0.25 to 4 parts by weight of water to 1 part by weight of glycerin. In the above formula, R8 is selected from hydrogen and a methyl group, and R is hydrogen, sodium, potassium, anthonium, and 2-3
Represents the residue of a saturated polyhydric alcohol having 2 to 4 carbon atoms and having 4 hydroxyl groups. However, all USs of the repeating unit are not residues of the saturated polyhydric alcohol. [Specific Structure and Effects of the Invention] Despite having a crosslinked structure, the crosslinked acrylic acid polymer used in the composition of the present invention dissolves in water or polyhydric alcohol and has a particle size of several μm. Forms a gel of extremely fine particles of the order of magnitude. To prepare such a polymer, R1@R2 is a mixture of appropriately selected acrylic acid monomers or a single monomer, and a crosslinking agent, in an organic solvent such as benzene, and mixed with azobisisobutyronyl iodine or the like. It can be produced by polymerization using a polymerization initiator. In this case, a monomer having two or more vinyl groups as a crosslinking agent is usually used in a range of 0.05 to 1
It is used in a range of 0% by weight. Acrylic acid monomers in which Rg is a residue of a polyhydric alcohol are always copolymerized with other acrylic acid monomers. A single polymer cannot provide the effects of the composition of the present invention. In order to produce a monomer having a residue of the above-mentioned saturated polyhydric alcohol, for example, 2- to 2- to 3-butane diol, such as ethylene glycol, glycerin, propylene glycol,
Saturated polyhydric alkyl having 3 OH groups and having 2 to 4 carbon atoms;
It is produced by an esterification reaction between a carbonyl group and a carbonyl group, and glycidol is sometimes used in addition to the above-mentioned saturated polyhydric alcohol. The composition of the present invention comprises the above-mentioned crosslinked acrylic acid copolymer or polymer (hereinafter referred to as polymer), glycerin,
and water. The ratio is the total amount of glycerin and water per 1 part by weight of polymer, and is 19 to 49
9 parts by weight, and the ratio of glycerin to water is 0.25 to 4 parts by weight of water per 1 part by weight of glycerin. If the total amount of water and glycerin is less than 19 parts by weight, it will be difficult to form a composition, and if it exceeds 499 parts by weight, the fluidity of the composition will become too large and it will not function as a gel lubricant. Along with this loss, water retention and moisturizing ability decrease. In addition, if the water content per 1 part by weight of glycerin is less than 0.25 parts by weight, its function as a lubricant will decrease, and if it exceeds 4 parts by weight, water retention and moisturizing properties will decrease, and furthermore, the weight will change. It becomes easier to wake up. The above-mentioned water-soluble gel-like crosslinked acrylic acid polymer composition has (,) extremely good water retention and moisturizing properties, almost no loss of water unless heated or vacuum dried, and does not cause weight changes under normal conditions. I don't.佽) Good stability; for example, it maintains a gel state without decomposing even when heated at 120°C for 1 hour. It is also not decomposed by microorganisms. 0 (0) It is water-soluble and non-stick, and is suitable for metals, glass, etc.
Or it can be easily washed off from skin etc. (i) It is anti-freezing, and does not freeze even at considerably low temperatures (for example, -20°C), and exhibits sufficient lubricity, water retention, and moisturizing properties in that state. It has excellent properties such as Since the composition of the present invention has the above characteristics, it is used for various purposes. (a) Because it is harmless, stable, and has good lubricity, it is a lubricant for medical instruments such as urinary catheters and enema devices that are heated repeatedly and used repeatedly. Because of its moisturizing properties, it is incorporated into skin care, hair care, and body care products to improve moisture balance, and it is also incorporated into conventional water-based adhesives, such as acrylic emulsions and SBn latex, to prevent excessive adhesive application. Prevents adhesion failure due to drying. Furthermore, by adding it to the warp sizing agent, it improves the flexibility and moisture retention of the warp. (0) Since it is not sticky and has good peelability from the skin, it is added to the base of the patch to improve water retention and feel when using the patch. It can be suitably used in a wide range of fields. Next, the present invention will be explained by showing examples and comparative examples. [Example 1] 60 mol% acrylic acid units, 60 mol% sodium acrylate units, 10% 2,3 dihydroxypropyl acrylate units (esterification reaction product of acrylic acid and glycerin) arranged irregularly and a polymer having a crosslinking point: 5 parts by weight, glycerin: t54Ji parts, water: 30 parts by weight, and propylene glycol: 1ffi:
The viscosity, p■■, and weight loss rate after forced heating were measured. The results are shown in Table 1. Upper = a Viscosity is measured using a BL type viscometer, No. 40-ta, 0
．． Measurement was performed under the conditions of 6 rps and 20°C. In addition, the weight loss rate after forced heating was determined by sampling the sample in a petri dish to a thickness of about 10 mm, placing it in an open air at 100°C, heating it for 200 minutes, and then measuring the weight loss rate. , Comparative Example 1] Various compositions were prepared and their physical properties were measured in the same manner as in Example 1. The results are shown in Table 1. All the polymers in the table have units arranged irregularly,
and has a crosslinking point. Table 1 [Effects] As described above, the crosslinked acrylic acid polymer composition according to the present invention is harmless, difficult to dry, and has extremely excellent stability, lubricity, water retention, and moisturizing properties. In addition, since it is water-soluble and can be easily washed with water, it has a wide range of uses in various fields, such as for blending cosmetics, adhesives, medicinal patches, warp pastes, etc., and as medical lubricants.

Claims (1)

[Scope of Claims] 1 part by weight of a crosslinked acrylic acid polymer having at least one structural unit represented by the following general formula as a repeating unit and having a crosslinking point in the repeating unit, 1 part by weight of glycerin
A mixture containing 0.25 to 4 parts by weight of water based on 19 parts by weight
A cross-linked acrylic acid polymer composition containing ~499 parts by weight. ▲There are mathematical formulas, chemical formulas, tables, etc.▼ In the above formula, R_1 is selected from hydrogen and methyl, and R_2 is hydrogen, sodium, potassium, lithium, ammonium, and a carbon atom having 2 to 3 hydroxyl groups.
4 represents the residue of a saturated polyhydric alcohol. However, all R_2 of the repeating unit is not a residue of the saturated polyhydric alcohol.