Amino resin dispersion with reduced aldehyde content,...

C - Chemistry – Metallurgy – 08 – L

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C08L 61/20 (2006.01) C08K 5/00 (2006.01) C08K 5/16 (2006.01) C08L 61/28 (2006.01) C09D 7/00 (2006.01)

Patent

CA 2218291

Amino resins that contain more free formaldehyde than is desirable for health and/or pollution reasons can be treated with a mixture of diketo reagents (or their nitrogen analogs) and other compounds containing amino moieties to reduce the free formaldehyde content while not diminishing, and in some cases even enhancing, the ability of the resins to function according to their normal uses. The invention is especially useful for melamine-formaldehyde resin dispersions useful to detackify paint.

Il est possible, dans le cadre de cette invention, de traiter des résines aminiques contenant davantage d'aldéhyde formique libre qu'il n'est souhaitable, eu égard à la santé et/ou à la pollution, à l'aide d'un mélange constitué de réactifs dicéto (ou de leurs analogues d'azote) et d'autres composés contenant des fragments aminés afin de réduire la concentration en aldéhyde formique libre, sans pour autant diminuer les aptitudes opératoires de ces résines dans leur plage normale d'utilisation et, même dans certains cas en les renforçant. Cette invention se révèle particulièrement utile à propos de l'emploi de dispersions de résine de mélamine - aldéhyde formique pour supprimer la tendance au collant d'une peinture.

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