Claims
- 1. A method for the production of a liquid absorbable material made of a porous formed article, comprising mixing 1 to 20% by weight of a monomer ingredient, said monomer ingredient comprising a monomer possessing one polymerizable unsaturated group in the molecular unit thereof and a cross-linking monomer possessing at least two polymerizable unsaturated groups in the molecular unit thereof with 99 to 80% by weight of water in the presence of 1 to 40% by weight, based on 100 parts by weight of said monomer ingredient, of an oil-soluble surfactant thereby preparing a water-in-oil type emulsion containing a large volume of water in the form of an inner discontinuous phase, thermally polymerizing said emulsion in the presence of a polymerizing initiator at a temperature in the range of 25.degree. to 90.degree. C. thereby giving rise to a porous cross-linked polymer, and compression molding said porous cross-linked polymer at a temperature of not less than the softening point of the cross-linked polymer.
- 2. A method according to claim 1, wherein said cross-linked polymer has a glass transition temperature in the range of -30.degree. to 90.degree. C.
- 3. A method according to claim 1, wherein said porous cross-linked polymer is a hydrate containing micropores of an average pore diameter in the range of 1 to 10 .mu.m and said liquid absorbable material is obtained by compressing to dewater said hydrate and subsequently drying the product of dewatering.
- 4. A method according to claim 1, wherein the proportion of said cross-linked monomer possessing at least two polymerizable unsaturated groups in the molecular unit thereof to the whole amount of said monomer ingredient is in the range of 1 to 50% by weight.
- 5. A method according to claim 1, wherein said monomer possessing one polymerizing unsaturated group in the molecular unit thereof contains not less than 50% by weight of an alkyl (meth)acrylate possessing an alkyl group of 1 to 20 carbon atoms.
- 6. A method according to claim 1, wherein said compressed porous cross-linked polymer has a density in the range of 0.2 to 1.0 g/cm.sup.3.
- 7. A method for the production of a liquid absorbable material made of a porous formed article comprising partitioning walls of cross-linked polymer and continuous micropores, said method comprising:
- mixing 1 to 20% by weight of a monomer ingredient, said monomer ingredient comprising a monomer possessing one polymerizable unsaturated group in the molecular unit thereof and a cross-linking monomer possessing at least two polymerizable unsaturated groups in the molecular unit thereof, with 99 to 80% by weight of water in the presence of 1 to 40% by weight, based on 100 parts by weight of said monomer ingredient, of an oil-soluble surfactant thereby preparing a water-in-oil type emulsion containing a large volume of water in the form of an inner discontinuous phase,
- thermally polymerizing said emulsion in the presence of a polymerizing initiator at a temperature in the range of 25.degree. to 90.degree. C. thereby giving rise to a porous cross-linked polymer, and
- compression molding said porous cross-linked polymer to form said porous formed article,
- wherein said porous formed article has a density of 0.2 to 1.0 g/cm.sup.3, said partitioning walls exhibit a swelling degree to kerosene in the range of 2 to 10, and said porous formed article has an absorption capacity per unit volume of at least 4 cm.sup.3 /cm.sup.3 for water, ethanol, toluene, and kerosene, respectively.
- 8. A method for the production of a liquid absorbable material made of a porous formed article comprising partitioning walls of cross-linked polymer and continuous micropores, said method comprising:
- mixing 1 to 20% by weight of a monomer ingredient, said monomer ingredient comprising a monomer possessing one polymerizable unsaturated group in the molecular unit thereof and a cross-linking monomer possessing at least two polymerizable unsaturated groups in the molecular unit thereof, with 99 to 80% by weight of water in the presence of 1 to 40% by weight, based on 100 parts by weight of said monomer ingredient, of an oil-soluble surfactant thereby preparing a water-in-oil type emulsion containing a large volume of water in the form of an inner discontinuous phase,
- thermally polymerizing said emulsion in the presence of a polymerizing initiator at a temperature in the range of 25.degree. to 90.degree. C. thereby giving rise to a porous cross-linked polymer, and
- compression molding said porous cross-linked polymer to form said porous formed article,
- wherein said porous formed article has a density in the range of 0.2 to 1.0 g/cm.sup.3 and an absorption capacity per unit weight of at least 10 g/g for water, ethanol, toluene and kerosine, respectively, when the liquids are at a temperature not less than the softening point of the cross-linked polymer.
Priority Claims (2)
Number |
Date |
Country |
Kind |
5-102138 |
Apr 1993 |
JPX |
|
5-190205 |
Jul 1993 |
JPX |
|
TECHNICAL FIELD
This application is a divisional of application Ser. No. 08/234,416, filed Apr. 28, 1994.
US Referenced Citations (9)
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EPX |
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JPX |
48-94785 |
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Divisions (1)
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Number |
Date |
Country |
Parent |
234416 |
Apr 1994 |
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