Method for the preparation of dispersions of graft polymers have broad distribution of particle sizes without wildly fluctuating viscosities.

摘要

It DISCOVERED A method for preparing polymer dispersions GRAFT HAVING DISTRIBUTION WITHOUT BROAD PARTICLE SIZE VISCOSITY FLUCTUATING messily. The method comprises: (a) preparing polyol dispersions INTERMEDIATE GRAFT CONTAINING 30% OF WEIGHT OR LESS OF SOLID TO IMPLEMENT A BROAD SIZE PARTIAL DISTRIBUTION IN AN ONGOING PROCESS FOR FEEDING A ENOUGH an ethylenically unsaturated monomer Y a free radical initiator WITHIN A flow reactor at a temperature sufficient to promote polymerization and (B) CHARGING polymer dispersion gRAFT INTERMEDIATE (A) TO A SEMI-PARTY REACTOR AS SEEDS TO FAVOR TO gRAFT TO INCREASE solids dispersion MORE THAN 30 PERCENT OF WEIGHT ALIMENTAR an effective amount of an ethylenically unsaturated monomer and a free radical initiator INSIDE THE REACTOR SEMI-PARTY at a temperature sufficient to promote seed growth, SO SEED pARTICLE GRENDES generally grow but retain the characteristics of wide distribution SIZE. The graft polymer thus formed is useful in the production of polyurethanes.