Additive for dehumidifying plaster
AssigneeCaterpillar Tractor Co.
InventorSiegfried Maier
Life of this patent
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Abstract
A plaster additive, especially for use with cement-based dehumidifying plasters which impart to the plaster the property of low resistance to the diffusion of water therethrough, permitting the application to moist or wet masonry and especially masonry subject to continuous moisture exposure, for example by capillary flow from the foundation. The additive according to the invention imparts to the fungus-resistant cement-based plasters the property of dehumidifying the wall while the surface of the plaster remains dry. The additive according to the invention may be used with normal interior or exterior plasters, adhesive plasters and also with thermally insulating plasters that include a thermally insulating filler, for example, styropor spheres.
Claims15
An additive for use with dehumidifying cement-based plasters containing surface active agents including:
- (a) 15-50 weight % of anionic sodium salts of alkylnapththalene sulfonic acids;
- (b) 25-75 weight % of sodium salts of alkylphenol ether sulfate and/or alkylbenzene sulfonate;
- and
- (c) 10-40 weight % of a butadiene free styrene interpolymer having an acid number of 5-15 as suitable for producing aqueous dispersions of plaster.
A dehumidifying plaster comprising a mixture of
- (A) 100 kg of a mixture of sand and cement, and (B) an additive comprising:
- (a) 15-50 weight % of anionic sodium salts of alkylnaphthalene sulfonic acids;
- (b) 25-75 weight % of sodium salts of sulfated C.sub.12 -C.sub.15 -oxoalcohol polyglycol ethers;
- and
- (c) 10-40 weight % of a styrene interpolymer having an acid number of 5-15 as suitable for producing aqueous synthetic dispersions.
A heat-insulating plaster consisting of 100 kg of a mixture of sand, cement, and a grainy heat flow resistant substance especially foamed polystyrene spheres combined with 50-100 grams of an additive comprising:
- (a) 15-50 weight % of anionic sodium salts of alkylnaphthalene sulfonic acids;
- (b) 25-75 weight % of sodium salts of sulfated C.sub.12 -C.sub.15 -oxoalcohol polyglycol ethers;
- and
- (c) 10-40 weight % of a styrene interpolymer having an acid number 5-15 as suitable for producing aqueous synthetic dispersions.
Dependencies are inferred from the claim text.