Phenol formaldehyde resins

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 8/10 (2006.01) C08G 8/04 (2006.01) C08K 5/053 (2006.01) C08K 5/092 (2006.01) C08K 5/12 (2006.01) C08L 61/10 (2006.01)

Patent

CA 2301127

A process for forming a phenol formaldehyde resin, the process comprising the steps of: (i) reacting phenol with an excess of a formaldehyde material in the presence of an acid or base catalyst until water separates from the reactants as an immiscible layer; (ii) adding a mixture comprising an excess of a polyhydric alcohol and an aromatic dicarboxylic or tricarboxylic acid, salt or anhydride thereof to the phenol and formaldehyde reaction mixture followed by addition of an alpha hydroxy acid; (iii) adding a non-aqueous solvent, wherein at last some of said water is removed either before addition of the mixture preparated in step (ii) or after addition of the alpha hydroxy acid; (iv) preparing a solution comprising a Lewis acid, a polyhydric alcohol, an alpha hydroxy acid, a non-aqueous solvent, an aromatic sulphonic acid and sulphuric or hydrochloric acid; (v) adding the solution formed in step (iv) to the mixture formed in step (ii) and allowing the mixture to cure.

Ce procédé de production de résine de phénol-formaldéhyde comporte les opérations suivantes: (i), réaction du phénol avec de la formaldéhyde en excès en présence d'un catalyseur acide ou basique jusqu'à ce que de l'eau se sépare des substances réagissantes sous forme de couche non miscible, (ii), adjonction d'un mélange renfermant un polyalcool en excès et un acide aromatique dicarboxylique ou tricarboxylique, un sel ou un anhydride de celui-ci au mélange réactionnel phénol et formaldéhyde, cette adjonction étant suivie par celle d'un acide hydroxy-alpha, (iii), adjonction d'un solvant non aqueux, une partie au moins de l'eau susmentionnée étant enlevée, que ce soit avant l'ajout du mélange préparé en (ii) ou après l'apport d'acide hydroxy-alpha, (iv), préparation d'une solution contenant un acide de Lewis, un polyalcool, un acide hydroxy-alpha, un solvant non aqueux, un acide aromatique sulfonique et un acide sulfurique ou un acide chlorhydrique, (v), adjonction de cette solution au mélange élaboré en (ii), et prise du mélange.

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