Waterborne sanitary can coating compositions

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 163/00 (2006.01) C08G 59/14 (2006.01) C09D 161/06 (2006.01) C09D 179/00 (2006.01) C09D 179/02 (2006.01)

Patent

CA 2375529

Waterborne sanitary can coating compositions, derived from at least (a) an epoxy resin, derived from phenol derivatives and epichlorohydrin, which has been converted into a cationic NH2 containing form by reaction with amine, an amine adduct or ammonia and subsequently has been converted into the corresponding ammonium salt by addition of an organic acid, (b) a phenol- formaldehyde resin as curing agent, (c) a polyketone resin, having a number average molecular weight Mn of at least 500, and (d) water, containing minor amounts of organic solvents. Coated tin plate coils on which said waterborne sanitary compositions have been applied and coated cans, obtained from the coated tin plate coil.

L'invention concerne des compositions de revêtement hygiéniques à base aqueuse de boîtes de conserve dérivées d'au moins (a) une résine époxy, tirée de dérivés phénoliques et de l'épichlorohydrine, convertie en une forme contenant NH¿2 ?cationique par réaction avec de l'amine, un produit d'addition amine ou de l'ammoniaque, convertie par la suite en sel d'ammonium correspondant par adjonction d'un acide organique; (b) une résine phénol-formaldéhyde comme agent de traitement; (c) une résine polycétone présentant un poids moléculaire moyen en nombre Mn d'au moins 500; et (d) de l'eau, contenant des doses minimes de solvants organiques. L'invention concerne enfin des galettes de feuillard en fer blanc revêtues sur lesquelles on applique des compositions hygiéniques à base aqueuse ainsi que des boîtes revêtues obtenues à partir de galettes de feuillard en fer blanc revêtues.

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