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US 6,051,634 AGranted
Water-dispersible or water-soluble polyurethanes as additives for building materials
AssigneeBayer Aktiengesellschaft
InventorsHans-Josef Laas, Jan Mazanek, Dietbert Knofel, Karl-Georg Bottger, Anke Reinschmidt
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Abstract
Use of water-dispersible or water-soluble polyether-urethanes, which optionally contain isocyanate groups, as additives for inorganic binders in the preparation of a building material, particularly a high-density or high-strength mortar or concrete composition. The building material resulting from the use of the water-dispersible or water-soluble polyether-urethanes.
Claims4
A method for making a mineral building material comprising the steps of:
- (i) homogeneously mixing a water-dispersible or water-soluble polyether-urethane composition with an aggregate, a hydraulic inorganic binder, and water, the polyether-urethane composition comprising:
- a) an average isocyanate functionality of less than 1.8, a content of aliphatically and/or cycloaliphatically bonded isocyanate groups (calculated as NCO;
- molecular weight=42) from 0 to 10 wt. %,
- b) 2.0 to 25.0 wt. % content of urethane groups (calculated as NHCOO;
- molecular weight=59),
- c) 30 to 90 wt. % content of ethylene oxide units (calculated as C.sub.2 H.sub.4 O;
- molecular weight=44) bonded within polyether chains containing an average of 5 to 50 ethylene oxide units;
- (ii) hardening the mixture of step (i) to form the mineral building material,
- wherein the polyether-urethanes are prepared by reaction of (i) polyisocyanates which are based on aliphatic and/or cycloaliphatic diisocyanates, contain isocyanurate groups and have an isocyanate group content of 12 to 28 wt. % and a content of monomeric diisocyanates of less than 0.5 wt. % with (ii) polyether-alcohols having an average of 5 to 50 ethylene oxide units and optionally further compounds of the molecular weight range 32 to 300 which carry groups which are reactive with isocyanate groups are employed.
6 more elements
A method for making a mineral building material comprising the steps of:
- (i) homogeneously mixing a water-dispersible or water-soluble polyether-urethane composition with an aggregate, a hydraulic inorganic binder, and water, the polyether-urethane composition comprising:
- a) an average isocyanate functionality of less than 1.8, a content of aliphatically and/or cycloaliphatically bonded isocyanate groups (calculated as NCO;
- molecular weight=42) from 0 to 10 wt. %,
- b) 2.0 to 25.0 wt. % content of urethane groups (calculated as NHCOO;
- molecular weight=59),
- c) 30 to 90 wt. % content of ethylene oxide units (calculated as C.sub.2 H.sub.4 O;
- molecular weight=44) bonded within polyether chains containing an average of 5 to 50 ethylene oxide units;
- (ii) hardening the mixture of step (i) to form the mineral building material;
- wherein the polyether-urethanes are prepared by reaction of (i) a polyisocyanate that is based on 1,6-diisocyanatohexane, containing substantially isocyanurate groups and optionally uretdione groups and/or allophanate groups, having an isocyanate group content of 19 to 24 wt. % and a content of monomeric 1,6-diisocyanatohexane of less than 0.5 wt. % with (ii) polyethylene glycol monomethyl ethers containing an average of 5 to 25 ethylene oxide units and optionally compounds having a molecular weight range 32 to 300 which carry groups which are reactive with isocyanate groups are employed.
6 more elements
Dependencies are inferred from the claim text.