| 摘要 |
Disclosed are solid, readily water-soluble addition polymers of acid addition salts of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate, whose lower alkyl group has up to 6 carbons and is straight or branched chain or cyclic. These polymers are insoluble in pentane, hexane and butane below their boiling points, and their aqueous solutions show amphoteric activity. These polymers result from polymerizing the starting monomeric acid addition salt of methacrylic acid and a 2-mono(lower)alkylaminoethyl methacrylate in the ratio of from about one mol to about 1.5 mols of one of them per mol of the other. Also disclosed is the method of producing these addition polymers by heating the starting acid addition salt under pressure in a low boiling aliphatic solvent at a temperature above its boiling point, from which after lowering the temperature the resulting addition polymer readily is separated as a light weight finely divided product.
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