Patent · US Expired

Preparation of addition-polymer powder

US6653372B1 · kind B1 · utility

3Cited by

6References

26Claims

0Family size

Assignee

BASF SE

Inventors

Joachim Pakusch · Ludwigshafen, DE
Joachim Roser · Dessel, BE
Maximilian Angel · Mutterstadt, DE
Andree Dragon · Speyer, DE

Key dates

Filing date	Jun 4, 1997
Grant date	Nov 25, 2003
Priority date	—
Expiry date	Oct 25, 2019

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC04B40/0042
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process for preparing an addition-polymer powder suitable for modifying a binding mineral building material by drying an aqueous addition-polymer dispersion whose film has a glass transition temperature Tg&lE;30° C. and to which a drying assistant has been added comprises adding to the aqueous addition-polymer dispersion before drying only a drying assistant which will have a plasticizing or deplasticizing effect in the ready-to-use mix of the binding mineral building material with water and admixing the resulting dry addition-polymer powder with at least one assistant in the form of a finely divided solid which will have an opposite effect to the drying assistant added before drying.

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