Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1997-06-04
1999-11-30
Reddick, Judy M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 64, 521 67, 521 71, 521 72, 524457, 524458, 524459, 524460, 524504, 524507, C08L 7500
Patent
active
059944218
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water-absorbent resin dispersion and a process for producing a polyurethane resin. More particularly, the invention relates to a water-absorbent resin dispersion characterized by a small particle diameter of the dispersoid and good dispersion stability and to a process for producing a polyurethane resin using said dispersion.
BACKGROUND ART
It is known to use a polymeric polyol as part of the polyol component for the production of a polyurethane resin. Japanese Kokai Publication Sho-54-133599, for instance, discloses the use of a hydrophilic vinyl monomer in the production of such a polymeric polyol. Though polymeric polyols obtainable by using an non-hydrophilic vinyl monomer such as styrene and acrylonitrile have been demonstrated to give stable dispersions, no comparable information is available about polymeric polyols obtainable with a hydrophilic vinyl monomer. Meanwhile, a dispersion obtainable by mixing a high-molecular-weight polyol with a water-absorbent resin is known.
However, when a hydrophilic vinyl monomer is used in the production process disclosed in Japanese Kokai Publication Sho-54-133599, a stable dispersion can hardly be obtained. Moreover, the mere admixture of a high-molecular-weight polyol and a water-absorbent resin has the drawback that the water-absorbent resin is liable to undergo cohesion and precipitation.
SUMMARY OF THE INVENTION
The inventors of the present invention did much research to develop a water-absorbent resin dispersion, which is endowed with a small particle diameter of the dispersoid and good dispersion stability and is easy to manufacture, and have ultimately perfected the present invention.
The present invention, therefore, is directed to a water-absorbent resin dispersion comprising a water-absorbent resin (B) or a hydrous gel thereof dispersed in a liquid or heat-meltable active hydrogen-containing organic compound (A), wherein said (B) is formed by in situ polymerization of a water-soluble monomer or a precursor thereof and a crosslinking agent and/or a polysaccharide in said (A); a polyurethane composition comprising a water-absorbent resin (B) or a hydrous gel thereof dispersed with a mean dispersoid particle diameter of 0.01 to 100.mu.m in a polyurethane, wherein said (B) is formed by polymerization of a water-soluble monomer or a precursor thereof and a crosslinking agent and/or a polysaccharide in a polyol which is a precursor of said polyurethane; a process for producing a polyurethane resin comprising subjecting said dispersion to reaction with an organic polyisocyanate compound; and a process for producing a polyurethane foam which comprises subjecting said dispersion and organic polyisocyanate compound to reaction in the presence of a blowing agent, optionally together, a catalyst, a foam-conditioning agent, and other additives.
DETAILED DISCLOSURE OF THE INVENTION
In the present invention, the liquid or heat-meltable active hydrogen-containing organic compound (A) includes compounds containing alcoholic-hydroxyl group, compounds containing phenolic-hydroxyl group, compounds containing carboxyl group, compounds containing thiol group, and compounds containing amino group.
The compounds containing alcoholic-hydroxyl group may for example be polyether monohydric alcohols and polyols. Among them, polyols are preferred.
The polyether monohydric alcohol includes a variety of compounds available upon addition of alkylene oxides to compounds each containing one active hydrogen atom (e.g. aliphatic, alicyclic, or aralkyl alcohols having 1 to 20 carbon atoms, monophenols, dialkylamines, morpholine, etc.). Also included are those ethers (e.g. methyl ethers, isopropyl ethers, phenyl ethers, etc.) and ester compounds (e.g. acetic esters and benzoic esters) which are available upon partial blocking of hydroxyl groups with alcohols or carboxylic acids.
The polyol includes polyether polyols, polyester polyols, polyols each having a backbone chain of carbon-carbon bonds, and amino-terminated polyols. Aside
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Ando Takao
Ishikawa Isao
Maeda Kohei
Matsuoka Masahiro
Nagata Kozaburo
Reddick Judy M.
Sanyo Chemical Industries Ltd.
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