Low temperature cure coating composition and method therefore

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 175/04 (2006.01) B05D 7/20 (2006.01) C09D 133/00 (2006.01) C09D 167/00 (2006.01)

Patent

CA 2423426

A method for a low temperature cure of a coating composition comprising: applying to a substrate a low temperature curing coating composition consisting essentially of a film forming component consisting essentially of a non-carbamate functional polymeric component selected from the group consisting of polyester, silicone modified polyester, polyurethane, acrylic, alkyd, epoxy, polyamide, phenolic and polysilane polymers and mixtures thereof; a crosslinking component to crosslink the non-carbamate functional polymeric component; a catalyst selected from the group consisting of Lewis acids, perflouroacetic acid, methane sul- fonic acid catalyst and mixtures thereof; and additives selected from the group consisting of solvents, flow control agents, pigments, flexibilizing resins, surfactants, waxes, wetting agents, plasticizers, anti- oxidants, UV light absorbers, and mixtures thereof, and subjecting the coated substrate to a cure temperature of between 280 °F and 450 °F, for a time sufficient to cure the coating.

L'invention concerne un procédé de durcissage à faible température d'une composition de revêtement. Ledit procédé consiste à appliquer sur un substrat une composition de revêtement durcissable à faible température, essentiellement composée d'un composant filmogène essentiellement constitué d'un constituant polymère fonctionnel non carbamate choisi dans le groupe des polymères polyesters, polyesters modifiés au silicone, polyuréthanes, acryliques, alkydes, époxys, polyamides, phénoliques, et polysilanes, ainsi que des mélanges de ceux-ci ; d'un catalyseur choisi dans le groupe des acides de Lewis, acide perfluoroacétique, catalyseurs acide sulfonique méthane, ainsi que des mélanges de ceux-ci ; et, d'additifs choisis dans le groupe des solvants, agents de contrôle de flux, pigments, résines de flexibilisation, tensio-actifs, paraffines, agents humidificateurs, plastifiants, anti-oxydants, absorbeurs de lumière UV, ainsi que des mélanges de ceux-ci. Ledit procédé consiste par ailleurs à soumettre le substrat revêtu à une température de durcissage de 280 DEG F à 450 DEG F sur une durée suffisante pour durcir le revêtement.

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