Process for the production of highly elastic foams containing urethane groups from polyethers, modified polyisocyanates and cross-linking agents
AssigneeBayer Aktiengesellschaft
InventorsHanns P. Muller, Hansjurgen Rabe, Kuno Wagner
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Abstract
The invention is directed to a process for the production of highly elastic, open-celled foams containing urethane groups by reacting polyether polyols with modified polyisocyanates in the presence of cross-linking agents and water characterized in that the reaction is carried out in the presence of 0.5 to 10 g/100 g of the polyether of a cross-linking mixture corresponding to the general formula C.sub.n H.sub.2n+2 O.sub.n wherein n=2 to 10, which has a statistical average of at least four hydroxyl groups per molecule.
Claims8
A process for the production of highly elastic foams containing urethane groups and having increased impression hardness by reacting polyethers containing at least two hydroxyl groups having a molecular weight of 400 to 10,000 with modified polyisocyanates which contain carbodiimide groups, urethane groups, allophanate groups, isocyanurate groups, urea or biuret groups or combinations thereof in the presence of cross-linking agents and water and optionally in the presence of catalysts, emulsifiers, stabilizers, organic blowing agents and other auxiliaries and additives, characterized in that the reaction is carried out in the presence of 0.5 to 10 g/100 g of the polyether of a cross-linking mixture corresponding to the general formula
- C.sub.n H.sub.2n+2 O.sub.n
- wherein n=2 to 10,
- which contains on a statistical average at least four hydroxyl groups per molecule.
Dependencies are inferred from the claim text.