Patent · US Expired

Continuous preparation of aqueous non-self-emulsifying polymer dispersions

US5124073A · kind A · utility

7Cited by

7References

4Claims

0Family size

Assignee

BASF SE

Inventors

Friedrich Goffing · Schifferstadt, DE
Joerg Kroker · Neustadt, DE
Rainer Nachtrab · Ludwigshafen, DE
Heino Thiele · Ludwigshafen, DE

Key dates

Filing date	Feb 8, 1990
Grant date	Jun 23, 1992
Priority date	—
Expiry date	Feb 8, 2010

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J3/03
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Aqueous non-self-emulsifying polymer dispersions having small particles and a long shelf life and based on highly viscous reaction resins are prepared without the addition of solvents, by means of an intensively dispersing screw apparatus, by a continuous process in which the preparation of the polymer dispersion is carried out in an intensive shear zone of the screw apparatus, the water/reaction resin ratio in this intensive shear zone corresponding to the phase inversion point or being close to it, and the specific energy supply is 0.01-0.15 kWh/kg, the residence time is 0.1-60 sec and the shear gradient is 2,000-20,000 sec.sup.-1.

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