Hardenable compositions comprising polyacid(s) and polyol(s)

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 201/00 (2006.01) B05D 7/00 (2006.01) C08F 8/14 (2006.01) C08J 3/24 (2006.01) C08K 5/05 (2006.01) C08K 5/092 (2006.01) C08K 5/17 (2006.01) C09D 5/02 (2006.01) C09D 11/00 (2006.01) C09D 133/02 (2006.01)

Patent

CA 2416427

The present invention provides hardenable coating compositions, comprising: a first compound selected from the group consisting of polyacids, polyanhydrides, salts thereof and mixtures thereof, and a second compound having two or more active hydrogen groups. When used as a roll coating composition, the first compound preferably has a low average molecular weight and an acid number greater than about 100. The hardenable coating composition preferably has an extended open time and can be rapidly cured to a substantially tack-free state in less than about one minute at 200 ~C. Coated articles and methods of coating are also provided.

La présente invention concerne des compositions de revêtement durcissables qui comprennent: un premier composé choisi dans le groupe constitué des polyacides, des polyanhydrides, des sels de ceux-ci et des mélanges de ceux-ci, et un second composé possédant au moins deux groupes hydrogène actifs. Lorsqu'on l'utilise comme composition de revêtement au rouleau, le premier composé présente, de préférence, un faible poids moléculaire moyen et un indice d'acidité supérieur à environ 100. Cette composition de revêtement durcissable possède un temps ouvert assez long et peut être rapidement durcie en un état sensiblement sans pégosité en moins d'une minute environ à 200 ·C. Cette invention concerne aussi des articles revêtus et des procédés de revêtement.

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