Process for the production of highly water absorptive polymers
First Claim
1. A process for producing a highly water absorptive polymer comprising the steps of:
- subjecting a water-soluble ethylenically unsaturated monomer comprising as the main component acrylic acid and/or an alkali metal or ammonium salt thereof to a water-in-oil, reverse-phase suspension polymerization in the presence of water, a water-soluble radical polymerization initiator, a dispersant and a hydrophobic hydrocarbon solvent to form a slurry of water-containing particles of a highly water absorptive polymer in the solvent,adding a polymerizable monomer to said slurry, andpolymerizing in said slurry the polymerizable monomer without the addition of additional polymerization initiator to obtain agglomerates of the particles of the highly water absorptive polymer.
1 Assignment
0 Petitions
Accused Products
Abstract
A process for producing a highly water absorptive polymer comprising the steps of subjecting a water-soluble ethylenically unsaturated monomer comprising as the main component acrylic acid and/or an alkali metal or ammonium salt thereof, and optionally containing a crosslinking agent to a water-in-oil type of reverse-phase polymerization in the presence of water, a water-soluble radical polymerization initiator, a dispersant and a hydrophobic hydrocarbon solvent to form a slurry of water-containing particles of a highly water absorptive polymer in the solvent, adding a polymerizable monomer to the slurry, and polymerizing the polymerizable monomer to obtain agglomerates of the particles of the highly water absorptive polymer.
23 Citations
8 Claims
-
1. A process for producing a highly water absorptive polymer comprising the steps of:
-
subjecting a water-soluble ethylenically unsaturated monomer comprising as the main component acrylic acid and/or an alkali metal or ammonium salt thereof to a water-in-oil, reverse-phase suspension polymerization in the presence of water, a water-soluble radical polymerization initiator, a dispersant and a hydrophobic hydrocarbon solvent to form a slurry of water-containing particles of a highly water absorptive polymer in the solvent, adding a polymerizable monomer to said slurry, and polymerizing in said slurry the polymerizable monomer without the addition of additional polymerization initiator to obtain agglomerates of the particles of the highly water absorptive polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
Specification