Hydrophilic sealants

C - Chemistry – Metallurgy – 09 – K

Patent

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Details

C09K 3/10 (2006.01) C08G 18/38 (2006.01) C08G 18/40 (2006.01)

Patent

CA 2694040

The present invention provides water swellable one-component sealants prepared by incorporation of polyols containing ethylene oxide ("EO") into the backbone of the polymer. The inventive one- component hydrophilic polyurethane sealant contains a silane-terminated polyurethane prepolymer, a compound having an ethylene oxide content of at least about 40 wt.%, based on the weight of the compound and a catalyst, optionally, one or more of plasticizers, fillers, pigments, drying agents, light stabilizers, antioxidants, thixotropic agents and bonding agents. The one- component hydrophilic polyurethane sealant increases at least about 1.4% by weight and at least about 2.5% by volume upon exposure to water for 24 hours and are capable of curing in a high humidity environment (including underwater) without foaming and maintain physical characteristics such as hardness.

Cette invention a trait à des adhésifs à composant unique, capables de gonfler dans l'eau, préparés en incorporant dans le squelette du polymère des polyols renfermant de l'oxyde d'éthylène (EO). L'adhésif de polyuréthane hydrophile à composant unique de l'invention contient un prépolymère de polyuréthane à terminaison silane, un composé dont la teneur en oxyde d'éthylène s'élève au moins à environ 40 % en poids par rapport au poids du composé et un catalyseur, éventuellement un ou plusieurs plastifiants, charges, pigments, agents siccatifs, photostabilisants, antioxydants, agents thixotropes et agents de liaison. L'adhésif de polyuréthane hydrophile à composant unique augmente d'au moins environ 1,4 % en poids et d'au moins environ 2,5 % en volume après exposition à l'eau pendant 24 heures, et est capable de durcir dans un environnement très humide (sous l'eau y compris) sans former de mousse et de conserver des caractéristiques physiques telles que la dureté.

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