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Root > Materials Chemistry > Patents > Rheological Additives > Plasticizer

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Materials Science: Superplasticizers (4)

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Flow agents for anhydrite-based flow screeds (German)
The invention relates to the use of polycarboxylate-based flow agents for anhydrite-based flow screeds. The advantage of the inventive flow agent in comparison with conventional products is that it provides screeds with good flowing and running properties and ensures long durational processability even when very small doses are used.
Hrsg.: SKW Polymers GmbH, DE10063291, WO2002049983, Juni 2002

Superplasticizer based on substituted polysaccharide sulfates (German)
The invention relates to substituted polysaccharide sulfates, consisting of a polysaccharide chain with an average molecular weight of 10000 to 200000 that contains 1-16% sulfur in the form of sulfate ester groups and 0.01 to 1 substituants in the form of polyalkylene oxide and/or polyalkylene imine groups in relation to the saccharide unit. Said polyalkylene oxide or polyalkylene imine group contains on average 5 to 300 alkylene oxide or alkylene imine groups. The invention also relates to a method for producing substituted polysulfates and to their use as high performance flow agents for cement mixtures.
Hrsg.: Heidelberger Bauchemie GmbH, DE19921175, EP1183277, Nov. 2000

Admixture and method for optimizing addition of EO/PO superplasticizer to concrete containing smectite clay-containing aggregates
In the preparation of aqueous cement compositions containing a plasticizer, such as an EO/PO polymer-containing plasticizer, or EO/PO comb polymer-containing plasticizer, and further containing clay, such as a smectite clay, which expands when in contact with water, the step of providing an agent operative to modify the clay whereby the plasticizer absorbing capability of the clay is reduced. In exemplary methods of the invention, the plasticizer is an EO/PO (e.g., oxyalkylene) plasticizer and preferably an EO/PO comb polymer, and the clay-activity-modifying agent may comprise an inorganic cation, an organic cation, a polar organic molecule capable of being absorbed by the clay, a clay dispersant (such as a polyphosphate), or a mixture thereof.
Hrsg.: Leslie A. Jardine et al, W.R. Grace & Co., 2002, US6352952

Flow improving agents for self-levelling floor screeds
The additive-combination of casein and a special polymer gives improved flowing properties vs. casein. However, the polymer can not substitute the casein completly.
Hrsg.: Alfred Kern et al, Süddeutsche Kalkstickstoff, DE4421722, US6150437, 2000

Polysuccinimide and polyaspartate as additives to cementitious materials
It is reported that polysuccinimide may be added to cementitious materials for the purposes of improving flowability during mixing, decreasing slump loss during transport and placement, and that it may provide extra strength upon hardening of the cementitious material. (In the aqueous environment of freshly mixed cementitious materials, polysuccinimide is converted to polyaspartate.)
Hrsg.: University of South Alabama; MBT Holding AG, US5908885, 1999

Superfluiding additive for cementitious compositions
A mixture of an acrylic superfluidifier, an ammonium salt, at least one surfactant, and possibly an antifoaming additive. Superfluidifiers having an acrylic structure sometimes show an considerable loss of workabilityoccuring already within very short times (5-10 minutes) of prearation of the mortar. This drawback can be overcome by adopting an additive system as described.
Hrsg.: Italcementi S.P.A., EP1082276, WO9955634, 1999, Patent erteilt 24.07.2002

Plasticizers Based on Polysaccharides (German)
Plasticizers and superplasticizers for use in concrete and mortars, based on both cellulose derivates (especially on Na-CMC and CMHEC) and starch derivates (especially on sulfoethyl starch).
Hrsg.: Degussa Construction Chemicals GmbH, DE10209812, 2002

Agents for and method of reducing the fluidity drop of hydraulic cement compositions and method of producing such agents
Water-soluble vinyl copolymers with numerical average molecular weight 500-20000, having two specified repetition units at a specified molar ratio and a sulfonate end group, can serve as an effective agent for reducing a drop in the fluidity of hydraulic cement compositions.
Hrsg.: Takemoto Yushi Kabushiki Kaisha Gamagouri-shi Alchi-ken, 1997. EP0816298

Cement dispersant
A superplasticizer which maintains the fluidity of the concrete for a long time and less retarding effect on cement than polycarboxylic acid compounds. The polymer is obtained by co-condensating monomers comprising a phenol with an poly(oxyethylene) or poly(oxypropylene) group, and an aromatic compound having a carboxyl group with formaldehyde.
Hrsg.: Kao Corporation, 1997, EP0780348

Cement dispersant
A cement dispersant with high dispersiong ability, high slump loss preventing effect, and a viscosity reducing effect even in concrete mixtures with low water/cement ratio. The admixture comprises (1) a copolymer derived from an unsaturated polyalkylene glycol ether monomer and a unsaturated carboxylic acid monomer, (2) an unsaturated polyalkylene glycol ether, and (3) a saturated polyalkylene glycol ether.
Hrsg.: Nippon Shokubai Co., Ltd., 2003. US20030106464

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