Polysiloxane-containing polyurethane elastomeric compositions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/44 (2006.01) A61L 15/26 (2006.01) A61L 27/00 (2006.01) A61L 27/18 (2006.01) A61L 29/00 (2006.01) A61L 29/06 (2006.01) A61L 31/00 (2006.01) A61L 31/06 (2006.01) C08G 18/08 (2006.01) C08G 18/48 (2006.01) C08G 18/61 (2006.01) C08G 18/65 (2006.01)

Patent

CA 2267276

The present invention relates to a material having improved mechanical properties, clarity, processability and/or degradation resistance comprising a polyurethane elastomeric composition which includes a soft segment derived from at least one polysiloxane macrodiol and at least one polyether and/or polycarbonate macrodiol. This material can function as a degradation resistant material or biomaterial and is particularly useful in the manufacture of medical devices, articles or implants which contact living tissues or bodily fluids. The present invention also provides a polyurethane elastomeric composition which includes a soft segment derived from about 60 to about 98 wt.% of at least one polysiloxane macrodiol and about 2 to about 40 wt.% of at least one polyether and/or polycarbonate macrodiol and processes for its preparation.

La présente invention concerne un matériau caractérisé par des propriétés mécaniques améliorées, par sa transparence, par sa transformabilité et/ou sa résistance à la dégradation. Ce matériau comprend une composition élastomère de polyuréthane comportant un segment mou dérivé d'au moins un macrodiol de polysiloxane et d'au moins un macrodiol de polyéther et/ou de polycarbonate. Ce matériau, qui peut intervenir comme matériau résistant à la dégradation ou comme biomatériau, convient particulièrement à la fabrication de dispositifs, d'articles et d'implants médicaux qui sont en contact avec les tissus vivants ou les fluides organiques. La présente invention concerne également une composition élastomère de polyuréthane comportant un segment mou, dérivé, pour environ 60 % à environ 98 % de sa masse, d'au moins un macrodiol de polysiloxane, et, pour environ 2 % à environ 40 % de sa masse, d'au moins un macrodiol de polyéther et/ou de polycarbonate. L'invention concerne enfin les techniques de préparation correspondantes.

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