Claims
- 1. A method of preparing an aqueous dispersion of a water-soluble cationic homopolymer or copolymer comprising polymerizing monomers using a water-soluble free-radical initiator in an aqueous saline solution in the presence of a stabilizer, the monomers selected from water-soluble cationic hydrophobically modified vinyl monomers or a water-soluble cationic or non-ionic hydrophobically modified vinyl monomer and a comonomer selected from water soluble cationic or non-ionic vinyl monomers, wherein the stabilizer is selected from block copolymers of cationic vinyl monomers and ethylene oxide.
- 2. The method of claim 1 wherein the cationic block of the block copolymer is formed from monomers of the general formula I: ##STR3## wherein R.sub.1 is hydrogen or methyl, R.sub.2 and R.sub.3 are alkyl of 1 to 6 carbon atoms, R.sub.4 is alkyl of 1 to 6 carbon atoms or benzyl, D is NH or 0, E is alkylene of 2 to 6 carbon atoms or hydroxylalkylene of 2 to 6 carbon atoms, and X is a halogenide, acetate or methosulphate.
- 3. The method of claim 1, wherein the cationic block of the block copolymer is formed from the monomers diallyldimethylammoniumchloride, vinylpyridiniumhalogenide, N-vinylimidazole or N-vinylimidazolium halogenide.
- 4. The method of claim 1, 2 or 3, wherein the stabiliser is used in quantities of 1 to 10% by mass with respect to the mass of the monomers used.
- 5. The method of claim 1, 2, 3 or 4, wherein the polymerisation is carried out in a temperature range from 30 to 90.degree. C.
- 6. The method of claim 1, 2, 3, 4 or 5, wherein the cationic block of the block copolymer has a molar mass between 1,000 and 300,000 g/mol.
- 7. The method of claim 1, 2, 3, 4, 5 or 6, wherein the polyethylene oxide block of the block copolymer has a molar mass between 200 and 20,000 g/mol.
Priority Claims (1)
Number |
Date |
Country |
Kind |
195 21 096 |
Jun 1995 |
DEX |
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Parent Case Info
This is a 371 of International Application No. PCT/DE96/01063, filed Jun. 10, 1996.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/DE96/01063 |
6/10/1996 |
|
|
3/6/1998 |
3/6/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO96/41821 |
12/27/1996 |
|
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US Referenced Citations (2)
Number |
Name |
Date |
Kind |
5006590 |
Takeda et al. |
Apr 1991 |
|
5403883 |
Messner et al. |
Apr 1995 |
|