摘要 |
- In the production of latices based on butadiene, isoprene and/or chloroprene and optionally vinyl comonomers by emulsion polymerisation, the monomers are dosed into a seed latex with a particle size of 10-80 nm, based on the monomers used or on inorganic pigments, in the presence of a free radical activator and emulsifier, so that the ratio of the rate of polymerisation to the rate of addition of the monomers is (0.05-0.7):1. Polymerisation is carried out to /- 95% monomer conversion at 10-95 deg C. Dosing of the emulsifier is regulated so that the final particle size (TGL) of the latex satisfies the equation; in which DL = the density, mL = the mass and TGL = the size of the particles in the latex to be produced; Dss = the density, ms = the mass and TGs = the size of the particles in the seed. The amounts used are 0.1-10 wt.% emulsifier, /- 15 wt.% conjugated diene(s), <= 85 wt.% vinyl comonomer(s) and 0.01-15 wt.% seed, all with respect to the total amount of monomer s used.
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申请人 |
BAYER AG, 51373 LEVERKUSEN, DE |
发明人 |
VOGT, HANS-GUENTER, DIPL.-CHEM. DR., 41540 DORMAGEN, DE;GRAVE, HEINRICH, DIPL.-CHEM. DR., 51467 BERGISCH GLADBACH, DE;BROS, HERMANN-JOSEF, DIPL.-ING., 51381 LEVERKUSEN, DE;MATNER, MARTIN, DIPL.-CHEM. DR., 51519 ODENTHAL, DE |