| 摘要 |
<p>A composition for making building materials water-repellent, before or after they are shaped, the composition containing organoalkoxysiloxanes of the formula <IMAGE> in which R1 is an alkyl or aryl radical, R2 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 (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, (b) 80 to 90% by weight of a water immiscible solvent and, if necessary, (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.</p> |
| 申请人 |
TH. GOLDSCHMIDT AG, 4300 ESSEN, DE |
发明人 |
FRITSCH, HERWIG, 4390 GLADBECK, DE;KOERNER, GOETZ, DR., 4300 ESSEN, DE;QUILITSCH, HERBERT, 5628 HEILIGENHAUS, DE;SCHAMBERG, ECKEHARD, DR., 4300 ESSEN, DE |
