Patent ID: 11866525
Assignee: ARCHROMA IP GMBH
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  D | IPC C  D

Claim 7:
8. Method according to claim 1, wherein the emulsion polymerization comprises at least the following four steps (a) to (d):
a) providing an aqueous solution comprising or consisting of the at least one water-soluble diaminostilbene disulphonic optical brightener of formula (1), and optionally at least one dispersing agent and
b) providing a homogeneous pre-dispersion, wherein the pre-dispersion comprises or consists of the at least one ethylenically unsaturated monomer, water and at least one dispersing agent, and
c) providing an aqueous solution comprising or consisting of a water-soluble azo compound of formula (2) and/or formula (3), and
d) adding the pre-dispersion obtained in (b) and the aqueous solution obtained in (c) concurrently to the aqueous solution obtained in (a).