Patent · US Expired

Process for preparing microemulsion polymer particles using high shear forces

US6177525A · kind A · utility

6Cited by

6References

11Claims

0Family size

Assignee

BASF SE

Inventors

Graham E. McKee · Ludwigshafen, DE
Gunter Renz · Pfullingen, DE
Ekkehard Jahns · Weinheim, DE
Walter Kastenhuber · Mannheim, DE

Key dates

Filing date	Feb 17, 1999
Grant date	Jan 23, 2001
Priority date	—
Expiry date	Feb 17, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F291/00
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A particulate polymer P having an average particle diameter d.sub.50 of from 0.1 to 50 .mu.m is prepared by a process in which an emulsion E is prepared from PA1 one or more monomers M, which are polymerizable by free radical polymerization to give the polymer P, PA1 water, and PA1 at least one protective colloid PC by the action of high shear forces, and the emulsion E is subjected to polymerization in a reactor with the use of a free radical polymerization initiator RI wherein, based on the emulsion E, not more than 75% by weight of the emulsion E (initially taken portion of E) are initially taken in the reactor at the beginning of the polymerization and at least 25% by weight of the emulsion E (feed portion of E) are not fed to the reactor until after the beginning of the polymerization.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.