Microencapsulatable solvent adhesive composition and method...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 9/00 (2006.01) C09J 11/00 (2006.01) C09J 127/06 (2006.01) F16L 13/10 (2006.01) F16L 47/02 (2006.01)

Patent

CA 2270365

A microencapsulatable solvent adhesive composition for coupling plastic conduits, such as pipes, connectors and related fittings comprises a water- insoluble polymer and a mixture of volatile organic solvents for the polymer, each of the solvents having 6 to 40 carbon atoms. This solvent adhesive composition is suitable for microencapsulation by aqueous-based microencapsulation processes. A plurality of microcapsules encapsulating the solvent adhesive composition are bound to a polymeric surface of a conduit, such as a pipe connector or fitting, by a binder composition, to form a surface coated with a layer of rupturable microcapsules. When the microcapsules are ruptured upon joining of the coated conduit to a second conduit, the volume of the released solvent adhesive composition is sufficient to cement the surfaces together.

Cette composition adhésive contenant des solvants et pouvant être microencapsulée, aux fins de raccordement de conduits en matière plastique, tels que des tuyaux, des raccords et accessoires associés, comprend un polymère insoluble dans l'eau, ainsi qu'un mélange de solvants organiques et volatils, destinés au polymère, chaque solvant possédant 6 à 40 atomes de carbone. Cette composition adhésive est conçue pour un microencapsulage à l'aide de procédés de microencapsulage à base d'eau. Une pluralité de microcapsules encapsulant la composition adhésive à base de solvants est fixée sur une surface polymère d'un conduit, tel qu'un raccord de tuyaux ou accessoire de tuyauterie, à l'aide d'une composition de fixation, afin de former une surface revêtue d'une couche de microcapsules pouvant se rompre. Lorsque celles-ci se rompent, au cours de l'assemblage du conduit revêtu de la composition, avec un second conduit, le volume de la composition adhésive à base de solvants libérés est suffisant pour cimenter ensemble les surfaces.

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