| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for preparing a PMMA seed latex and a method for preparing a chlorinated vinyl polymer latex, in which disadvantages of methods of the prior arts are remedied. <P>SOLUTION: The method for preparing a PMMA seed latex comprises radical polymerization in an aqueous emulsion of methyl methacrylate and optionally at least one comonomer. The method is carried out by using (A) methyl methacrylate and optionally at least one comonomer, (B) at least one radical generator, (C) at least one emulsifier in a total amount of at least 4 mass% relative to the total weight of (A), and (D) water, through steps of: introducing at least one fraction of (B), at least 2.5 mass% of (C) relative to the total weight of (A), at least one fraction of (D), and optionally at least one fraction of (A) into a reactor; then reacting the contents in the reactor while continuously introducing the balance of (A), (B), (C) and (D) into the reactor to obtain a methyl methacrylate (PMMA) seed latex; and isolating the obtained seed latex. <P>COPYRIGHT: (C)2013,JPO&INPIT |
