Gypsum-based materials, process for their preparation and their use
AssigneeBayer Aktiengesellschaft
InventorsChristian Rasp, Jan Mazanek, Ulrich von Gizycki
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Abstract
Materials based on gypsum and organic additives are improved if they contain polyethers and, if desired, polymers. They can be used in a wide range of areas, for example as slabs in the building sector and for improving plasters, mortars, insulating materials and other construction compositions, casts and/or moulds.
Claims11
A gypsum based material containing organic additives and a polyether.
A gypsum-based material containing a polyether selected from the group consisting of polyethers of the formula (I), polyethers of the formula (II) ##STR9## in each of which St represents the radical of a starter molecule,
- n represents the number of reactive hydrogen atoms originally present in the starter molecule,
- a represents an integer or a fractional number from 17 to 23,
- b represents an integer or a fractional number from 3 to 6,
- c represents an integer or a fractional number from 1 to 6,
- d represents an integer or a fractional number from 17 to 23, and
- e represents an integer or a fractional number from 3 to 15,
- polyethers obtained from vegetable or animal fats or oils by reaction with ethylene oxide and/or propylene oxide in the presence of basic catalysts, and mixtures of said polyethers;
- and also containing an organic additive selected from the group consisting of polyurethanes, polyurethane-ureas, polybutadiene, polybutadiene/styrene, polyvinyl acetate, polystyrene/(meth)acrylate, polybutadiene/styrene/acrylonitrile, and mixtures thereof.
Dependencies are inferred from the claim text.