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US 10,131,580 B2Granted
Method for producing a prefabricated building material
AssigneeBASF SE
InventorsUwe Gehrig, Ekkehard Jahns, Michael Schinabeck, Martin Pichler, Mehmet Akif Pekmezci, Mehmet Ergin
Life of this patent
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Abstract
The present invention relates to a method for producing a gypsum-containing foamed prefabricated building material and to a gypsum-containing foamed prefabricated building material.
Claims21
An aqueous alkyl ketene dimer dispersion comprising
- (a) an alkyl ketene dimer of the formula (I)
- and/or of the formula (II)
- in which
- R1 and R2 are identical or different hydrocarbon radicals comprising 10 to 24 carbon atoms;
- (b) at least one emulsifier having a nitrogen content in the range from 0.05 to 1% by weight and a Brookfield viscosity (20° C.;
- spindle 61 or 62;
- 12 rpm) in the range from about 10 to about 500 mPas in a 10% w/w aqueous solution, the emulsifier being selected from the group consisting of a starch, cellulose, starch derivative and cellulose derivative;
- (c) a condensation product of phenol sulfonic acid and formaldehyde, naphthalene sulfonic acid and formaldehyde or naphthalene sulfonic acid, phenol, formaldehyde and urea wherein sulfonic acid groups of the phenol sulfonic acid and the naphthalene sulfonic acid may optionally be present in protonated or deprotonated or partly in protonated and partly in deprotonated form;
- wherein the dispersion has a charge density in the range from −5 to −150 μeq/g.
6 more elements
Dependencies are inferred from the claim text.