Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-06-15
1996-04-16
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
604372, C08L 3302
Patent
active
055083811
ABSTRACT:
The present invention provides an improved process for preparing a highly water absorbent resin having a superior suction power and excellent gel strength, which consists essentially of:
(1) neutralizing acrylic acid to a neutralization degree ranging from 50 to 100% based on the total number of moles of the acid employed and polymerizing it by a reverse phase suspension polymerization to provide a neutralized polymer;
(2) dehydrating the polymer until its water content reaches 25% by weight or less based on the weight of the polymer through an azeotropic distillation thereof in the presence of a lipophilic solvent;
(3) crosslinking the dehydrated polymer in the presence of a hydrophilic crosslinking agent containing at least two epoxy groups in an amount ranging from 0.05 to 5.0% by weight and water added in an amount ranging from 7.0 to 25.0% by weight based on the weight of the dehydrated polymer;
(4) dehydrating the crosslinked polymer until 60% by weight or more of the amount of water added in step(3) above is removed through an azeotropic distillation thereof under reflux; and
(5) recovering the crosslinked and dehydrated polymer by filtration.
REFERENCES:
patent: 4497930 (1985-02-01), Yamasaki
patent: 4541871 (1985-09-01), Obayashi
patent: 4735987 (1988-04-01), Morita
patent: 5314952 (1994-05-01), Choi
Choi Su-Beom
Jang Tae-Hwan
Kim Myung-Joong
Lee Hyung-Mann
Bleutge John C.
Lucky Limited
Wilson D. R.
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