Tackified polydiorganosiloxane polyurea segmented copolymers...

C - Chemistry – Metallurgy – 08 – L

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C08L 83/10 (2006.01) A61L 15/58 (2006.01) C08G 18/61 (2006.01) C08L 83/02 (2006.01) C09D 183/10 (2006.01) C09J 7/02 (2006.01) C09J 175/00 (2006.01) C09J 183/04 (2006.01) C09J 183/10 (2006.01) C08G 77/452 (2006.01) E01F 9/04 (2006.01) F16F 15/02 (2006.01)

Patent

CA 2218912

A tackified composition comprising (a) a polydiorganosiloxane polyurea segmented copolymer comprising the reaction product of (i) at least one polyamine, wherein the polyamine comprises at least one polydiorganosiloxane diamine, or a mixture of at least one polydiorganosiloxane diamine and at least one organic polyamine, and (ii) at least one polyisocyanate, wherein the mol ratio of isocyanate to amine is between 0.9:1 and 0.95:1 or between 1.05:1 and about 1.3:1, and (b) silicate resins. The tackified compositions are useful as pressure sensitive adhesives, particularly for foamed backing tapes, medical tapes and the like, hot melt adhesives, vibration dampers, anti- corrosive materials.

La présente invention concerne une composition collante comprenant d'une part (a) un copolymère segmenté de polydiorganisiloxane polyurée constitué du produit de réaction (i) d'au moins une polyamine, laquelle polyamine comprend au moins une polydiorganisiloxane diamine ou un mélange d'au moins une polydiorganisiloxane diamine avec au moins une polyamine organique, et (ii) au moins un polyisocyanate, le rapport molaire entre l'isocyanate et l'amine se situant entre 0,9:1 et 0,95:1 ou entre 1,05:1 et environ 1,3:1, et d'autre part (b) des résines à silicates. Ces compositions collantes conviennent particulièrement pour les adhésifs autocollants, notamment les bandes à support de mousse, les bandes médicales et analogues, les adhésifs thermofusibles, les amortisseurs de vibrations et les matières anticorrosion.

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