Ampholytic polymer capable of absorbing aqueous electrolyte solution
AssigneeToyo Boseki Kabushiki Kaisha
InventorsKuniyoshi Ogura, Kouji Sasaki
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Abstract
There is disclosed an ampholytic polymer capable of absorbing aqueous electrolyte solutions, which is obtainable by polymerization of a monomer mixture including (A) at least 10 mol % of an ampholytic vinyl monomer, with the proviso that when the monomer (A) has no self-crosslinkability, the amount of monomer (A) is in the range of 10 to 99.995 mol %. The monomer mixture may further include (B) 90 mol % or less of a non-ampholytic vinyl monomer and (C) 1 mol % or less of a crosslinkable monomer, with the proviso that the total amount of monomers (A), (B) and (C) is 100 mol % and when the monomer (A) has no self-crosslinkability, the amount of monomer (C) is in the range of 0.005 to 1 mol %.
Claims6
An ampholytic polymer capable of absorbing an aqueous electrolyte solution, which is obtainable by polymerization of a monomer mixture comprising (A) 10 mol % or more of an ampholytic vinyl monomer selected from the group consisting of:
- ##STR5## wherein R.sup.1 is hydrogen or methyl;
- R.sup.2 is a straight-chain or branched C.sub.1 -C.sub.6 alkylene or hydroxyalkylene;
- R.sup.3 and R.sup.4 are independently methyl or ethyl;
- R.sup.5 is straight-chain or branched C.sub.1 -C.sub.10 alkylene or hydroxyalkylene;
- X is --COO.sup.- or --SO.sub.3.sup.- ;
- and Y is an ester or amido linkage;
- and ##STR6## wherein R.sup.1 and R.sup.5 are each as defined above and X is --COO.sup.- (B) 90 mol % or less of a non-ampholytic vinyl monomer comprising at least one selected from the group consisting of acrylic acid and its alkali salt and (C) 1 mol % or less of a cross-linkable monomer with the proviso that the total amount of monomers (A), (B) and (C) is 100 mol % and when the monomer (A) has no self-crosslinkability, the amount of monomer (A) is in the range of 10 to 99.995 mol % and the amount of monomer (C) is in the range of 0.005 to 0.1 mol %;
- the absorption capacity for synthetic seawater of said polymer being at least 25.
Dependencies are inferred from the claim text.