Storage stable amino-formaldehyde resins and applications...

C - Chemistry – Metallurgy – 08 – G

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C08G 12/38 (2006.01) C08G 12/12 (2006.01) C08G 12/32 (2006.01)

Patent

CA 2726467

Amino-formaldehyde resins may be prepared using formulations including formaldehyde, glycerin and at least one amino compound selected from the group consisting of urea, melamine, and mixtures thereof; under reaction conditions sufficient to prepare a resin, wherein; the amino-formaldehyde resin is prepared in a substantial absence of a sulfonating agent, ethylene glycol, and polyalkylene glycols. If the amino compound is urea, then the urea is present in a molar ratio of formaldehyde to urea ranging from 0.70 to 1.30; if the amino compound is melamine, then the melamine is present in a molar ratio of formaldehyde to melamine ranging from 1.3 to 2.2; and if the amino compound is a mixture of urea and melamine, then the mixture of urea and melamine is present in a molar ratio of formaldehyde to urea and melamine ranging from 0.35 to 1.3.

Linvention concerne des résines amino-formaldéhyde qui peuvent être préparées en utilisant des formulations qui comprennent du formaldéhyde, de la glycérine et au moins un composé amino choisi dans le groupe constitué de lurée, la mélamine et leurs mélanges, dans des conditions de réaction suffisantes pour préparer une résine. Selon linvention, la résine amino-formaldéhyde est préparée sensiblement en labsence dun agent de sulfonation, déthylène glycol et de polyalkylène glycols. Si le composé amino est lurée, alors lurée est présente en un rapport molaire formaldéhyde sur urée allant de 0,70 à 1,30 ; si le composé amino est la mélamine, alors la mélamine est présente en un rapport molaire formaldéhyde sur mélamine allant de 1,3 à 2,2 ; et si le composé amino est un mélange durée et de mélamine, alors le mélange durée et de mélamine est présent en un rapport molaire formaldéhyde sur urée et mélamine allant de 0,35 à 1,3.

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