Patent · US Expired

Formulations of defoaming agents containing polysiloxanes and polyethers

US4468491A · kind A · utility

8Cited by

2References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Helmut Steinberger · Leverkusen, DE
Heinrich Alberts

Key dates

Filing date	Dec 10, 1982
Grant date	Aug 28, 1984
Priority date	—
Expiry date	Dec 10, 2002

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB01D19/0404
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

A process for forming a polymer suitable for use in a defoaming agent, comprising polymerizing in the presence of a free-radical-forming catalyst a composition comprising by weight approximately PA0 10-90% of a polydiorganosiloxane, PA0 5-85% of a polyalkylene oxide or polyalkylene oxide derivative, and PA0 5-85% of a vinyl monomer, thereby to form vinyl polymer bridges linking the polydiorganosiloxane and polyalkylene oxide or derivative thereof. The polymer is then blended with water and an emulsifying and/or dispersing auxiliary and subjected to high shear to form a defoaming agent.

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