Prepolymer compositions and sealants made therefrom

Details Prepolymer compositions and sealants made therefrom Prepolymer compositions and sealants made therefrom

C - Chemistry, Metallurgy

08

G

C08G 18/80 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2540614

Prepolymer compositions for preparing a one-part, moisture-curable sealant, adhesive or coating, and a method of making such prepolymer compositions are provided. The prepolymer compositions comprise a polyurethane prepolymer that is end-capped with silane groups or a combination of silane groups and end capping groups that have been derived from an alcohol and an amount, referred to hereinafter as an "excess", of unreacted aromatic alcohol having a molecular weight of less than 2000. The excess of unreacted aromatic alcohol in the composition is from greater than 0% to 15% by mole of the level of original NCO groups in the prepolymer. From 50 to 100% of the original NCO groups are end-capped with silane groups, and from 0 to 50% of the original NCO groups are end-capped with a end-capping group that has been derived from an aromatic alcohol, an aliphatic alcohol or both. Sealant compositions and coating compositions comprising the present prepolymer composition are also provided. The aromatic alcohol is selected from phenol, 3-methoxyphenol, 4-methoxyphenol, nonylphenol, meta-cresol, para- cresol, 4-chlorophenol, meta-hydroxybenzaldehyde, ortho-hydroxybenzaldehyde, parahydroxybenzaldehyde, hydroquinone, 3-hydroxyacetophenone, and 4-hydroxyacetophenone, or any combination thereof.

L'invention concerne des compositions de prépolymères destinées à la préparation d'un matériau d'étanchéité monobloc pouvant être durci à l'humidité, d'un adhésif ou d'un revêtement, ainsi qu'un procédé destiné à la fabrication de ces compositions de prépolymères. Ces compositions de prépolymères comprennent un prépolymère de polyuréthanne terminé par des groupes silane ou une combinaison de groupes silane et de groupes d'extrémité dérivés d'un alcool et d'une quantité, dite <= excédentaire >=, d'alcool aromatique inaltéré ayant une masse moléculaire inférieure à 2000. L'excédent d'alcool aromatique inaltéré dans la composition est supérieur à 0 % et inférieur à 15 % par mol du niveau de groupes de NCO de départ dans le prépolymère. Entre 50 et 100 % des groupes de NCO de départ comprennent un groupe d'extrémité dérivé d'un alcool aromatique d'un alcool aliphatique ou des deux. L'invention concerne également des compositions d'étanchéité et des compositions de revêtement comprenant la présente composition de prépolymère.

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