| 摘要 |
<p>1. A process for the manufacture of fine-particle aqueous copylymer dispersions having a solids content of from 10 to 75% by weight calculated on the dispersion by means of the emulsion polymerisation of a) from 1 to 50% by weight of ethylene and b) from 99 to 50% by weight of at least one vinyl monomer, by means of radical initiators and in the presence of emulsifiers and/or protective colloids and, if desired, further standard additives the vinyl monomer phase comprising b1) from 60 to 100% by weight of vinyl chloride (VC) b2) from 0 to 40% by weight of oil-soluble ethylenically unsaturated monomers copoly merisable with a) and b ;), and b3) from 0 to 10% by weight of ethylenically unsature functional monomers and/or unsaturated monomers characterised in that 1 the vinyl monomer phase is present at the start in an amount of approximately 1 to 40% by weight, and II at least one inert organic substance having a water solubility of from 10**3 to 200 g/l and a molecular weight of not more than 1000 in an amount of from 0.1 to 15 by weight calculated in each case on the total weight of component b) is present at least partly at the star III the remainder of component b) and, optionally, of the inert organic substance is metered in during polymerisation an IV polymerisation is carried out at temperatures of from 0 to 120 C under an ethylene pressure of from 10 to 150 bar which is built up at the latest by the moment when the initial batch has polymerise.</p> |
