US Patent No: 5,855,667
Number of patents in Portfolio can not be more than 2000
Gypsum mixture containing hydrophobic additive and method for hydrophobing gysum
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Jan 5, 1999
Issued date -
Jul 16, 1997
filing date -
08/895,461
serial no -
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Abstract
A gypsum mixture is disclosed which has hydrophobic additive substantially uniformly dispersed therein and which comprises gypsum, a first silane of the general formula (RO).sub.3 SiR or of the general formula (RO).sub.2 SiR.sub.2, and a second silane of the general formula (RO).sub.3 SiR' or of the general formula (RO).sub.2 SiRR', wherein each R is the same or different and represents a lower alkyl group, and R' represents a lower alkyl group which is substituted by a substituent selected from an amino, amino-lower alkyl-amino or dialkylenetriamine group. Preferably, the first silane is methyltrimethoxysilane and the second silane is N-(2-aminoethyl)-3-aminopropyltrimethoxysilane. Also disclosed is a method for preparing said gypsum mixture.
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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,051,129 Masonry water repellent composition | 40 | 1990 | |
| 5,110,684 Masonry water repellent | 20 | 1990 | |
| 5,073,195 Aqueous silane water repellent compositions | 66 | 1991 | |
| 5,205,860 Water repellents containing organosilicon compounds | 22 | 1992 | |
| 5,209,775 Water repellents containing organosilicon compounds | 29 | 1992 | |
| 5,300,327 Water repellent organosilicon compositions | 23 | 1993 | |
| 5,421,866 Water repellent compositions | 57 | 1994 | |
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| 4,835,014 Method for imparting water repellency to absorbent inorganic building materials | 18 | 1987 | |
| 4,851,047 Process for preparing water-repellent articles from gypsum powder containing hydrophobic agents | 11 | 1988 | |
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| 5,776,245 Method for hydrophobing gypsum | 10 | 1997 | |
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| 4,643,771 Production of water-repellent moldings from plaster | 33 | 1985 | |
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| 5,100,684 Process of using silica to decrease fat absorption | 8 | 1991 | |
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| 4,889,747 Hydrophobic expanded perlite compositions and process for preparing the same | 25 | 1989 | |
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| 5,336,715 Organopolysiloxane composition | 10 | 1993 | |