C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 3/09 (2006.01) C08G 65/337 (2006.01) C08J 3/03 (2006.01) C08J 3/07 (2006.01) C08L 71/02 (2006.01)
Patent
CA 2264713
A process of preparing a concentrate which is useful as a thickener for aqueous compositions is provided. The process comprises obtaining a solution of an associative thickener compound in an organic solvent capable of forming a low boiling azeotrope with water. The solution is essentially free of water at this point and is at a temperature above the boiling point of said low boiling azeotrope. Water is added to said solution and an azeotrope of water and said organic solvent is distilled. The rate of addition of water is sufficient to replace said azeotrope with water, but is insufficient to cause a second phase to form in the resulting mixture of said solution and said water. The process yields a concentrate of an associative thickener in water, which concentrate is essentially free of volatile organic solvents.
Procédé servant à préparer un concentré utile en tant qu'épaississant pour des compositions aqueuses. Ce procédé consiste à obtenir une solution d'un composé épaississant associé dans un solvant organique capable de constituer un mélange azéotrope à ébullition basse avec de l'eau. Cette solution est essentiellement exempte d'eau à ce point et sa température est supérieure au point d'ébullition dudit mélange azéotrope. On ajoute de l'eau à ladite solution et on distille un mélange azéotrope d'eau et dudit solvant organique. Le taux d'apport de l'eau est suffisant pour remplacer ledit mélange azéotrope par de l'eau, mais est insuffisant pour provoquer la formation d'une deuxième phase dans le mélange obtenu de ladite solution et de ladite eau. Ce procédé permet d'obtenir un concentré d'un épaississant associé dans de l'eau, ledit concentré étant exempt de solvants organiques volatils.
Grinstein Reuben H.
Shah Dipak
Wiggins Michael
Henkel Corporation
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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