Claims
- 1. A water soluble cationic acrylamide polymer having relatively uniform cationic quaternary amine functional unit distribution comprising a polymer of a monomer of the formula
- CH.sub.2 =RC--CONH.sub.2 (a)
- wherein R is H or CH.sub.3 and a monomer having quaternary amine units and having the formula
- CH.sub.2 .dbd.CHR.sub.1 COO(CH.sub.2).sub.n N(CH.sub.3).sup.+ R.sub.2.sup.-(b)
- where R.sub.1 is H or CH.sub.3, n is 2 or 3 and R.sub.2 is Cl.sup.- or CH.sub.3 OSO.sub.3.sup.-, wherein said polymer is formed by acidifying said monomer (a) with an acid containing carboxylate groups having a pKa greater than 1 to provide a pH in the range of between about 2.0 and 4.5, and polymerizing with monomer (b), wherein the weighted standard deviation of the charge distribution as calculated from measurements of the disappearance rates of the monomers is less than about 0.6.
- 2. The polymer of claim 1 wherein the polymer is derived from a monomer mixture which contains also a different ethylenically unsaturated monomer.
- 3. The polymer of claim 1 wherein n is 3.
- 4. The polymer of claim 1 wherein n is 2.
- 5. The polymer of claim 1 wherein R is H.
- 6. The polymer of claim 1 wherein R is CH.sub.3.
- 7. The polymer of claim 1 wherein the (a) monomer is acrylamide and the (b) monomer is 3-methyacrylamidopropyltrimethyl ammonium chloride.
- 8. The polymer of claim 1 wherein the (a) monomer is acrylamide and the (b) monomer is 1-trimethylammonium-2-hydroxylpropylmethacrylate methosulfate.
- 9. The polymer of claim 1 wherein the (a) monomer is acrylamide and the (b) monomer is dimethylaminoethylmethacrylate methylchloride quaternary salt.
- 10. The polymer of claim 1 wherein said weighted standard deviation is less than about 0.5.
- 11. The polymer of claim 1 wherein said weighted standard deviation is between about 0.3 and about 0.6.
- 12. The polymer of claim 2 wherein said weighted standard deviation is between about 0.3 and about 0.6.
- 13. The polymer of claim 3 wherein said weighted standard deviation is between about 0.3 and about 0.5.
- 14. The polymer of claim 4 wherein said weighted standard deviation is between about 0.3 and about 0.5.
- 15. The polymer of claim 14 wherein R is H.
- 16. The polymer of claim 1, wherein said acid is a dicarboxylic acid.
- 17. The polymer of claim 16, wherein said acid is adipic acid.
- 18. The polymer of claim 16, wherein said acid is succinic acid.
Parent Case Info
This application is a continuation-in-part of our application Ser. No. 761,089 filed Aug. 2, 1985 (now U.S. Pat. No. 4,668,747), which is in turn a continuation-in-part of our Ser. No. 653,253 filed Sept. 24, 1984 now abandoned.
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|
3929751 |
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Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
761089 |
Aug 1985 |
|
Parent |
653253 |
Sep 1984 |
|