Aqueous adhesive compositions containing stabilized phenolic...

Details Aqueous adhesive compositions containing stabilized phenolic... Aqueous adhesive compositions containing stabilized phenolic...

C - Chemistry, Metallurgy

09

J

C09J 123/28 (2006.01) C09D 161/04 (2006.01) C09J 5/02 (2006.01) C09J 123/34 (2006.01) C09J 129/04 (2006.01) C09J 161/10 (2006.01) C08L 23/34 (2006.01) C08L 29/04 (2006.01)

Patent

CA 2117382

An aqueous primer composition containing a polyvinyl alcohol-stabilized aqueous phenolic resin dispersion, a latex of a halogenated polyolefin, and a metal oxide. The phenolic resin dispersion is prepared by mixing (a) a pre-formed, solid, substantially water-insolube, phenolic resin; (b) water; (c) an organic coupling solvent; and (d) polyvinyl alcohol, at a temperature and for a period of time sufficient to form a dispersion of said phenolic resin in water. The aqueous primer composition substantially reduces the utilization of organic solvents, is resistant to pre-bake conditions, and provides for a robust adhesive bond which is flexible and resistant to adverse environments.

Une composition d'amorçage aqueuse contient une dispersion de résine phénolique aqueuse stabilisée à l'alcool de polyvinyle, un latex d'une polyoléfine halogénée et un oxyde métallique. On prépare la dispersion de résine phénolique en mélangeant a) une résine phénolique pré-formée, solide et non hydro-soluble, b) de l'eau, c) un solvant de couplage organique et d) de l'alcool de polyvinyle, à une température et pendant une durée suffisantes pour que se forme une dispersion de cette résine phénolique dans l'eau. Cette composition d'amorçage aqueuse limite nettement le recours aux solvants organiques, résiste aux conditions de pré-cuisson et offre une liaison adhésive forte qui se révèle souple et résistante en milieu agressif.

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