Patent · US Expired

Prevention of efflorescence phenomena on mineral substrates

US4999218A · kind A · utility

21Cited by

3References

5Claims

0Family size

Assignee

BASF SE

Inventors

Gerd Rehmer · Beindersheim, DE
Manfred Schwartz · Bischofswerda, DE
Bernhard Dotzauer · Frankenthal (Pfalz), DE

Key dates

Filing date	Aug 8, 1989
Grant date	Mar 12, 1991
Priority date	—
Expiry date	Aug 8, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/4935
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

Efflorescence phenomena on mineral substrates are prevented by coating the surface of the mineral substrates with aqueous polyacrylate dispersions and drying the coating, if necessary at elevated temperatures, by a process in which a mixture of PA1 (A) a dispersion of a copolymer of PA2 (a) (meth)acrylates of alkanols which are of 3 to 20 carbon atoms and have a tertiary CH group, PA2 (b) styrene, .alpha.-methylstyrene, methyl methacrylate, tert-butyl (meth)acrylate and/or (meth)acrylonitrile and PA2 (c) mono- and/or dicarboxylic acids of 3 to 5 carbon atoms and/or or their amides which may be substituted at the N atom by alkyl, and PA1 (B) an aromatic ketone is used for the coating, and the coating is exposed to ultraviolet light.

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