Preparation for making inorganic building materials water-repellent

US4486476A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Herwig Fritsch · Gladbeck, DE
• Gotz Koerner · Essen, DE
• Herbert Quilitsch · Heiligenhaus, DE
• Eckehard Schamberg · Essen, DE

Key dates

• Filing date: Apr 5, 1984
• Grant date: Dec 4, 1984
• Expiry date: Apr 5, 2004

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31663
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A composition for making building materials water-repellent, before or after they are shaped, the composition containing organoalkoxysiloxanes of the formula ##STR1## in which R.sup.1 is an alkyl or aryl radical, R.sup.2 is an alkyl radical with 1 to 4 carbon atoms, a=0.8 to 1.5, and b is not greater than 2. The composition contains PA1 (a) 1 to 20% by weight of a mixture of organoalkoxypolysiloxanes of the aforementioned formula, 25 to 75% weight of organoalkoxysiloxanes having a b-value of 0.1 to 0.5 (siloxanes A) and 75 to 25% by weight of the organopolysiloxanes having a b-value 0.8 to 2.0 (siloxanes B), and in which the sum of a and b is not greater than 3, PA1 (b) 80 to 90% by weight of a water immiscible solvent and, if necessary, PA1 (c) known condensation catalysts. The organoalkoxysiloxane mixture has a surprisingly increased stability on alkaline walling. At the same time, a high depth of penetration and good surface effectiveness are observed.