| 摘要 |
Emulsion polymers, formed by reacting a monomer phase with a water phase, are generated in a tubular reactor having a controlled loop section (10) to give a partially developed product, such as one having 5-20% unreacted monomer, and a controlled plug section (11), which is preferably larger than the loop section by a factor of at least two, to give a fully developed product. Means (19, 17) exist to cool both loop and plug sections but preferably to keep the plug section at a higher temperature, which temperature can be zoned. Supplementary reactants may be introduced into the plug section. One such reactant may be a monomer to encase particle cores formed in the loop section with shells. An expansion agent may be included in the reactants which is dormant in the loop section but active in a higher temperature plug section. |
