Patent · US Expired

Citric acid derivatives as emulsifiers for emulsion polymerization

US4737543A · kind A · utility

4Cited by

3References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Udo-Winfried Hendricks · Odenthal, DE
Adolf Schmidt · Adelsheim, DE

Key dates

Filing date	Feb 11, 1987
Grant date	Apr 12, 1988
Priority date	—
Expiry date	Feb 11, 2007

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F2/26
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Process for the preparation of polymer dispersions with particle diameters of 50 to 1000 nm, wherein there are employed, as emulsifiers for the emulsion polymerization citric acid derivatives of the general formula (I) ##STR1## in which, independently of one another, R.sub.1, R.sub.2 and R.sub.3 denote C.sub.6 -C.sub.20 -alkyl, (including cycloalkyl) hydrogen, sodium, potassium, lithium or ammonium and PA1 R.sub.4 denotes hydrogen or acetyl, with the proviso that at least one of the radicals R.sub.1 to R.sub.3 denotes alkyl, and as initiators water-soluble agents which form free radicals or redox systems with at least one water-soluble component.

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