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Root > Materials Chemistry > Patents > Water retention agents

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Suppliers of Raw Materials: Cellulose Ether (1)

Suppliers of Raw Materials: Water retaining additives (1)

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Water retention agents: Cold-water-soluble, unmodified starches used to replace cellulose ethers
In tile adhesives some cellulose ether has been replaced by an unmodified, cold-water-soluble starch without negative effects on water retention.
Hrsg.: National Starch and Chemical Investment Holding Corp., 1996, US5575840

Cellulose ethers modified with superabsorbent polymers
Cellulose ethers are modified with crosslinked water-swellable organic polymers (superslurper, crosslinked polyacryl amides). Those compounds are described as water retention aid in tile adhesives, and as additives in spray plasters, wall finishing compounds, tape joint cements, wall paper adhesives, and the like. In tile adhesives this additive improved open time, sag resistance, and bonding strength.
Hrsg.: The Dow Chemical Company, US4487864, 1984 (Equivalent: EP0131090)

Building composition containing 3-alkoxy-2-hydroxypropylhydroxyethyl cellulose
Hydrophob modified HEC (n-Butylglycidyl modified hydroxyethyl cellulose) is described for use in dry mortars. Cellulose ethers f this type are available under the trade name Nexton®.
Hrsg.: Aqualon Company, 1990. US4939192

Mixtures of hydrogel-forming polymers and building materials
Superabsorbent polymers with a particle size <200 µm are used to supply gypsum- or cement-based mortars with free water for a sufficient long period for the hydration reaction.
Hrsg.: BASF AG, 2003. US2003144386 (Equivalents: DE10202039, EP1329435)

Low molekular weight polyvinyl alcohol as water retaining additive
Cement-based tile adhesives which have superior compressive strength as well as bond strength to both vitreous and non-vitreous tile. It is reported that partial replacement of cellulose ethers with polyvinyl alcohols does not cause a reduction in water retentive properties.
Hrsg.: Tile Council of America Inc., US4118241, 1978

Methyl ethyl hydroxyalkyl cellulose (MEHEC, MEHPC)
Methyl ethyl hydroxyethyl cellulose for use as rheological additive in dry mortars. It has been tested (in comparison to MHEC, MHPC, and EHEC) in cementitious tile adhesives. MEHECs are available under the name "Bermocoll M".
Hrsg.: Akzo Nobel NV, 2003. WO03048070

Water-retaining additive based on guar derivatives
Describes a mixture of a mineral thixotropic agent (sepiolite, attapulgite) and a guar ether (hydroxypropylguar) for use as a water retaining thickener in drymix mortars, especially in cement-based tile ahesives.
Hrsg.: Tolsa S.A., 2001, EP1090889 (Equivalent: WO9959933)

Methylcelluloses in aqueous fluid polymer suspensions
Aqueous pourable suspensions of cellulose ethers (MC, MHEC, MHPC) are prepared by dispersing up to 20% by weight cellulose ether in an concentrated salt solution. The salts used include NaCl, KCl, Na2SO4, KH2PO4 and sodium formate. Xanthan gum is used to prevent the suspensions from settling (addition rate 0.1%).
Hrsg.: Charles L. Burdick, Thomas J. Podlas, 2003. US6576048

Water retention agent based on chemically modified cellulose ether
Cellulose ethers are chemically bonded to water-soluble, at least predominately synthetic polymers containing acrylic units, i.e. polyacryl amides. Water retention of plastering mortars based on cement and gypsum has been investigated and the products according to the invention were considerably superior to the unmodified cellulose ethers in their water-retention capacity.
Hrsg.: Wolff Walsrode AG, US4330441, 1982 (Equivalents: EP0014258, DE2900110)

Method for improving the water retentivity of mortars (German)
The water retentive properties of dry-set mortars containing water retentive agents such as cellulose ethers can be improved by the addition of small amounts of a promoter material such as ethylene glycol, diethylene glycol, propylene glycol, 1,3-propane diol, glycerol monoacetate and diacetate, ethyl glycolate and mono- and di-ethanol amines
Hrsg.: Tile Council of America Inc., US4211572, 1980 (Equivalent: DE2900327)

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