Viscoelastic polyurethane foam

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

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

Patent

CA 2529725

The subject invention provides a viscoelastic polyurethane foam having a density of from one to thirty pounds per cubic foot formed from a composition comprising an isocyanate component substantially free of toluene diisocyanate, an isocyanate-reactive component, and a chain extender having a backbone chain with from two to eight carbon atoms. The chain extender also has a weight- average molecular weight of less than 1, 000 and is present in an amount of from 5 to 50 parts by weight based on 100 parts by weight of the composition. The viscoelastic polyurethane foam has a glass transition temperature of from 15 to 35 degrees Celsius and a tan delta peak of from 0.9 to 1.5.

L'invention concerne une mousse de polyuréthanne viscoélastique présentant une densité comprise entre 1 et 30 lb/pi?3¿, cette mousse étant réalisée à partir d'une composition comprenant un composant isocyanate sensiblement exempt de toluène diisocyanate, un composant réactif aux isocyanates, ainsi qu'un allongeur de chaîne présentant un squelette comportant deux à huit atomes de carbone. Cet allongeur de chaîne possède un poids moléculaire moyen en poids inférieur à 1000 et il est présent dans une quantité comprise entre 5 et 50 parties en poids pour 100 parties en poids de la composition. Cette mousse de polyuréthanne viscoélastique présente une température de transition vitreuse comprise entre 15 et 35 ·C et une tangente delta maximale comprise entre 0,9 et 1,5.

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