Gel compounds, their production and use
AssigneeBayer Aktiengesellschaft
InventorsDietmar Schapel, Heinz-Dieter Ebert, Hartwig Grammes
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Abstract
Improved gel compounds based on reaction products of polyols and polyisocyanates are characterized in that the polyol component consists of a mixture of a) one or more polyols having hydroxyl values below 112 and b) one or more polyols having hydroxyl values of 112 to 600 and in that the isocyanate index of the reaction mixture is in the range from 15 to 70. They may be used as pressure-distributing elements.
Claims11
An improved gel compound based on a reaction product of polyols and polyisocyanates, in which the polyol component consists essentially of a mixture of
- a) one or more polyols having hydroxyl values below 112 and
- b) one or more polyols having hydroxyl values of 112 to 600 and in which the isocyanate index of the reaction mixture is in the range from 15 to 60 and wherein the reaction is carried out in the presence of an amine or organo tin catalyst.
A process for the production of a gel comprising:
- (a) mixing:
- (i) one or more polyisocyanates,
- (ii) one or more polyols having hydroxyl values below 112,
- (iii) one or more polyols having hydroxyl values in the range of from 112 to 600, and
- (iv) a catalyst,
- to form a mixture having an isocyanate index of between 15 and 60, and for which the product of the isocyanate functionality and the functionality of the polyol component is at least 5.2, which mixture reacts to form a gel, and
- (b) allowing the mixture to react and form a gel.
Dependencies are inferred from the claim text.