One-shot polyurethane elastomers with very low compression set

Details One-shot polyurethane elastomers with very low compression set One-shot polyurethane elastomers with very low compression set

C - Chemistry, Metallurgy

08

G

C08G 18/76 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2327690

The present invention relates to a process for the production of one- shot polyurethane elastomers having low compression sets. This process comprises reacting a polymethylene poly(phenylisocyanate) having an average functionality of 2.2 to 2.8, and a polyol component that has an average functionality of 2.0 or less. The polyol component comprises at least one relatively high molecular weight isocyanate-reactive component, and at least one relatively low molecular weight isocyanate-reactive component, with the functionalities and quantities of each component being such that the above average functionality of 2.0 or less for the polyol component is satisfied. Polyurethane elastomers produced by the process of this invention are characterized by compression sets of less than 10%.

La présente invention se rapporte à un procédé de production d'elastomères de polyuréthane ponctuels avec ensembles à faible compression. Ce procédé consiste à effectuer la réaction d'un polyméthylène poly(phenylisocyanate) ayant une fonctionnalité moyenne de 2,2 à 2,8, et un composant polyol ayant une fonctionnalité moyenne de 2,0 ou moins. Le composant polyol comprend au moins un composant réactif d'isocyanate à poids moléculaire relativement faible. Les fonctionnalités et les quantités de chaque composant sont de telle sorte que la fonctionnalité moyenne de 2,0 ou moins pour le composant polyol soit satisfaite. Les estomères de polyuréthane produits par le processus de la présente invention sont caractérisés par des séries de compression de moins de 10 %.

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