Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1998-04-22
2000-07-04
Wu, David W.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525183, 5253293, 526240, C08L 3904, C08F 830, C08F 3600, C08F 3004
Patent
active
060840323
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a polymer composition containing carboxyl group having good solubility, thickening property and flow characteristics and suited for use as a thickener for various aqueous solutions.
BACKGROUND ART
Crosslinked polymer containing carboxyl group have so far been used as thickeners for various aqueous solutions. Such crosslinked polymers containing carboxyl group include, among others, copolymers of an .alpha.,.beta.-unsaturated carboxylic acid, such as acrylic acid, and a polyallyl ether (U.S. Pat. No. 2,923,692), copolymers of an .alpha.,.beta.-unsaturated carboxylic acid and hexaallyltrimethylene trisulfone (U.S. Pat. No. 2,958,679), copolymers of an .alpha.,.beta.-unsaturated carboxylic acid and triallyl phosphate (U.S. Pat. No. 3,426,004) and copolymers of an .alpha.,.beta.-unsaturated carboxylic acid and glycidyl methacrylate or the like (Japanese Kokai Publication Sho-58-84819).
These crosslinked polymers containing carboxyl group are once dissolved in water and then neutralized with an alkali, and the neutralized viscous liquids are used as thickeners, as suspension stabilizers for emulsions or suspensions, and for other purposes. Therefore, it is necessary to first prepare uniform aqueous solutions. It is thus of primary importance to prevent a formation of undissolved powder lumps on the occasion of dissolution in water. Once an undissolved powder lump is formed, a gel-like layer is formed on the lump surface and this decreases the rate of diffusion of water into the lump inside and makes it difficult to obtain a uniform aqueous solution.
Moreover, the higher the viscosity of the neutralized viscous liquid is, the wider the field of application as a thickener becomes and the lesser the amount required is. Further, for the flowing characteristics such as yield value, the higher the yield value is, the wider the field of application as a suspension stabilizer for emulsions and suspensions, hence the commercial value becomes higher.
SUMMARY OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide a polymer composition containing carboxyl group which is excellent in water solubility, in thickening effect and in flow characteristics of the neutralized viscous liquid obtained after neutralization of the aqueous solution.
The gist of the present invention lies in that the polymer composition containing carboxyl group comprises (A) a crosslinked polymer prepared from (a) an .alpha.,.beta.-unsaturated carboxylic acid and (b) a compound having at least two ethylenically unsaturated groups, and (B) at least one of a polymer comprising vinylpyrrolidone as an essential constituent thereof, and polyethylene oxide.
DETAILED DESCRIPTION OF THE INVENTION
In the following, the present invention is described in further detail.
The .alpha.,.beta.-unsaturated carboxylic acid (a) to be used in the practice of the present invention is not limited to any particular species but includes, among others, acrylic acid, methacrylic acid, crotonic acid, maleic acid, itaconic acid, fumaric acid and other olefinic unsaturated carboxylic acids.
These may be used either singly or in combination as a mixture of two or more. Among them, acrylic acid is most preferred since it is readily available at low cost and can give polymers having good performance.
The compound (b) having at least two ethylenically unsaturated groups, which is to be used in the practice of the present invention, is not limited to any particular species provided that it is soluble in the inert solvent to be described later herein. Thus, it includes, among others, acrylate esters with two or more acryloyl moieties as derived from polyols such as ethylene glycol, propylene glycol, polyoxyethylene glycol, polyoxypropylene glycol, glycerol, polyglycerol, trimethylolpropane, pentaerythritol, saccharose, sorbitol, etc.; methacrylate esters with two or more methacryloyl moieties as derived from such polyols, allyl ethers with two or more allyl moieties as derived from such pol
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Fujikake Masato
Hamamoto Shigeki
Kawakita Tomoki
Kobayashi Shinji
Tabata Mitsutaka
Sumitomo Seika Chemicals Co. Ltd.
Wu David W.
Zalukaeva Tanya
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