Claims
- 1. A gypsum based material containing organic additives and a polyether.
- 2. A material of claim 1, which contains in the hardened state 0.02 to 5% by weight of polyether.
- 3. A material of claim 1, in which the polyether is one of the formulae (I) and (II) ##STR8## in 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 form the group consisting of polyurethanes, polyurethane-ureas, polybutadiene, polybutadiene/styrene, polyvinyl acetate, polystyrene/(meth)acrylate, polybutadiene/styrene/acrylonitrile, and mixtures thereof.
- 4. The material of claim 1, wherein said organic additive is selected from the group consisting of polyurethanes, polyurethane-ureas, polybutadiene, polybutadiene/styrene, polyvinyl acetate, polystyrene/(meth)acrylate, polybutadiene/styrene/acrylonitrile, and mixtures thereof.
- 5. The material of claim 4, wherein said organic additives and said polyethers are present in a total amount of 0.02 to 50% by weight of said material in the hardened state.
- 6. A process for the production of a material of claim 1, in which, relative to not yet set gypsum, 18 to 400% by weight of water, relative to the hardened material, 0.02 to 5% by weight of said polyether and said organic additive are mixed in such amount that, relative to the hardened material, a total of 0.02 to 50% by weight of said polyethers and said organic additives are present, and not yet hardened gypsum is added, and the mixture is allowed to harden.
- 7. The process of claim 6, in which the organic additives are used in the form of an aqueous dispersion having a solid content of 1 to 50% by weight.
- 8. A process of claim 6, in which mixing is carried out at 10.degree. to 40.degree. C. and hardening at 10.degree. to 70.degree. C.
- 9. A process of claim 6, in which the mixture is allowed to harden with shaping.
- 10. 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.
- 11. The material of claim 10, wherein said polyether is a polyether of formula (I) and said other polymer is a polyurethane.
Priority Claims (1)
Number |
Date |
Country |
Kind |
41 19 665.1 |
Jun 1991 |
DEX |
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Parent Case Info
This application is a continuation-in-part of application Ser. No. 07/894,412, filed on Jun. 5, 1992, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4293474 |
Dieterich et al. |
Oct 1981 |
|
4544683 |
Muller et al. |
Oct 1985 |
|
5091497 |
Grogler et al. |
Feb 1992 |
|
Foreign Referenced Citations (6)
Number |
Date |
Country |
0054175 |
Jun 1982 |
EPX |
0128399 |
Dec 1984 |
EPX |
0238858 |
Sep 1987 |
EPX |
0403974 |
Dec 1990 |
EPX |
2050084 |
Apr 1972 |
DEX |
WO9100253 |
Jan 1991 |
WOX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
894412 |
Jun 1992 |
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