Curable composition

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 57/00 (2006.01) C08K 3/26 (2006.01)

Patent

CA 2397779

Many curable compositions comprising as a curing ingredient a vinyl polymer having at least one crosslinkable functional group contain general-purpose heavy calcium carbonate having a specific surface area of about 1 m2/g. These compositions however have problems that it is difficult to obtain therefrom a cured object having a high elongation and that they are insufficient in adhesion to unprimed surfaces and in weathering adhesion. A curable composition which comprises (I) a vinyl polymer having at least one crosslinkable functional group and (II) heavy calcium carbonate having a specific surface area of 1.5 to 50 m2/g is improved in viscosity ratio and spatula cuttability, gives a cured object improved in breaking strength and elongation at break, and is improved in adhesion to various adherends and weathering adhesion.

De nombreuses compositions durcissables comprenant, comme agent de durcissement, un polymère vinylique possédant au moins un groupe fonctionnel réticulable renferment un carbonate de calcium lourd à usages multiples ayant une surface spécifique de l'ordre de 1 m?2¿/g. Cependant, ces compositions présentent un inconvénient dans la mesure où il est difficile d'obtenir, à partir de celles-ci, un objet durci à allongement élevé et où leurs propriétés d'adhésion sur des surfaces non apprêtées ou en cas d'exposition aux intempéries sont insuffisantes. L'invention concerne donc une composition renfermant (I) un polymère vinylique possédant au moins un groupe fonctionnel réticulable et (II) un carbonate de calcium lourd ayant une surface spécifique comprise entre 1,5 et 50 m?2¿/g, dont on a amélioré le rapport de viscosité et l'aptitude au découpage à la spatule. Ladite composition permet d'obtenir un objet durci à propriétés de résistance et d'allongement à la rupture améliorées, et qui adhère mieux sur divers supports et en cas d'exposition aux intempéries.

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