Stable phenolic resin polymer dispersions having low free...

C - Chemistry – Metallurgy – 08 – G

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C08G 14/10 (2006.01) C08L 61/34 (2006.01)

Patent

CA 2609551

Stable dispersions of phenolic resins, particularly bisphenol-A/formaldehyde resins, for use in e.g., baking enamels, coatings, adhesives, binders, etc., are disclosed. The dispersions have low levels (e.g., <0.1% by weight) of free aldehyde, thereby reducing environmental harms associated with aldehyde emissions. Low free aldehyde levels are achieved using melamine as an aldehyde scavenger during preparation. It has now been discovered that melamine, in contrast to other scavengers of aldehydes, does not adversely affect dispersion stability, interfere with later processing operations, or negatively impact the final resin product quality (e.g., after curing).

L'invention concerne des dispersions stables de résines phénoliques, en particulier de résines bisphénol-A/formaldéhyde, destinées à une utilisation par exemple dans des émaux au four, des revêtements, des adhésifs, des liants, etc. Ces dispersions présentent de faibles teneurs (par exemple, < 0,1 % en poids) en aldéhydes libres, permettant ainsi de réduire les nuisances environnementales associées aux émissions d'aldéhydes. De faibles taux d'aldéhydes sont atteints en utilisant de la mélamine en tant que désactivateur d'aldéhydes pendant la préparation. Il a maintenant été découvert que la mélamine, contrairement à d'autres désactivateurs d'aldéhydes, n'affecte pas la stabilité de la dispersion, n'interfère pas avec les opérations de traitement ultérieures, et n'a pas d'impact négatif sur la qualité du produit résineux final (par exemple, après durcissement).

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