Hydrophobicizing agents for hydrophobicizing gypsum-plaster-bound construction materials
AssigneeWacker Polymer Systems GmbH & Co. KG
InventorsHerbert Eck, Klaus Adler
Life of this patent
Estimating the term…
Abstract
The invention relates to a hydrophobicizing agent for gypsum-plaster-bound construction materials comprising a substrate based on pulverulent organic or inorganic solids with a BET surface area >5 g/m2 and comprising one or more organopolysiloxanes having Si-bonded hydrogen (organohydropolysiloxanes) built up from units of the general formula HaSiR1bO(4-a-b)/2, where the radicals R1 are identical or different monovalent hydrocarbon or hydrocarbonoxy radicals having from one to 15 carbon atoms, or are hydroxyl groups, with the proviso that at least one Si-bonded hydrogen atom per molecule is present, and a takes values from 0 to 3, and b takes values from 0 to 3.
Claims12
A gypsum plaster-containing composition, comprising, per 100 parts gypsum plaster, a pulverulent hydrophobicizing agent sufficient to supply from 0.05 to 5 parts by weight of an organohydropolysiloxane, said pulverulent hydrophobicizing agent consisting essentially of at least one organohydropolysiloxane containing units of the formula
- HaSiR1bO(4-a-b)/2,
- wherein
- R1 independently are monovalent C1-15 hydrocarbon radicals, C1-15 hydrocarbonoxy radicals or hydroxyl radicals, a is from 0 to 3, and b is from 0 to 3, with the proviso that at least one Si-bonded hydrogen is present on average per molecule, supported on a pulverulent organic or inorganic solid substrate having a BET surface area greater than 5 m2/g.
Dependencies are inferred from the claim text.