Patent · US Expired

Method for making polymodal aqueous synthetic resin dispersions

US4539361A · kind A · utility

61Cited by

8References

2Claims

0Family size

Assignee

Rohm Co., Ltd. · JP

Inventors

Werner Siol · Pfungstadt, DE
Wolfgang Klesse · Mainz, DE
Norbert Suetterlin
Hubert Rauch · Weiterstadt, DE

Key dates

Filing date	Mar 4, 1985
Grant date	Sep 3, 1985
Priority date	—
Expiry date	Mar 4, 2005

Classification

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

Abstract

A method for making an aqueous polymodal synthetic resin dispersion by the emulsion polymerization of an ethylenically unsaturated monomer difficultly soluble in water, or a mixture of such monomers forming a polymer which is water insoluble under the conditions of polymerization, in an aqueous phase containing an emulsifier and a water soluble polymerization initiator, which method comprises adding a seed latex to the polymerization mixture in the course of the emulsion polymerization before more than 40 weight percent of said monomers have been polymerized, the particles of said seed latex being smaller by a factor ranging from 2 to 15 than are particles already formed by emulsion polymerization, the amount by weight of the particles in the seed latex being not greater than 10 percent by weight of the monomers and the ratio by weight of particles of said seed latex to the weight of the monomers already polymerized being from 1:4 to 1:500.

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