A combination of a solid solvent and a melt-processible...

C - Chemistry – Metallurgy – 08 – K

Patent

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Details

C08K 5/16 (2006.01) B32B 7/12 (2006.01) C08K 5/20 (2006.01) C08K 5/205 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2388911

A new class of solid solvents selected from adipamides, bisacetamides, biscarbamates, and dibenzamides has been found effective to reduce the melt viscosity of certain block copolymers while not substantially adversely affecting the mechanical properties of the block copolymer when both block copolymer and solid solvent are below their melt temperature. The block copolymers can be polyether-polyurethane block copolymers, polyester- polyurethane block copolymers, polyester-polyether block copolymers, polyamide polyether, or polyamide polyester. The combination is especially useful as an adhesive, as the adhesive component for fabric laminates or as the adhesive for seam sealing tapes.

Selon l'invention, on a découvert qu'une nouvelle catégorie de solvants solides choisis parmi les adipamides, les bisacétamides, les biscarbamates, et les dibenzamides permettait de réduire efficacement la viscosité à l'état fondu de certains copolymères séquencés sans avoir d'effets sensiblement indésirables sur leurs propriétés mécaniques, lorsque que le copolymère séquencé et le solvant solide se trouvent tous deux en deçà de leur température de fusion. Lesdits copolymères séquencés peuvent être des copolymères polyéther-polyuréthanne, des copolymères polyester-polyuréthanne, des copolymères polyester-polyéther, des copolymères polyamide polyéther ou des copolymères polyamide polyester. La combinaison selon l'invention est particulièrement utile comme adhésif, comme composant adhésif de tissus stratifiés ou comme adhésif pour ruban de scellement de couture.

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