Aliphatic, low-emission thermoplastic polyurethane moulding...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/66 (2006.01) C08G 18/08 (2006.01) C08G 18/42 (2006.01) C08G 18/44 (2006.01)

Patent

CA 2315765

The invention relates to polyurethane moulding materials which can be processed thermoplastically in the form of sintered powder and are suitable for producing textured sinter films, made exclusively from linear alphatic components. The polyol component consists of between 30 and 80 parts by weight of an aliphatic polycarbonate diol with a mean molecular weight <o>M</o>n of between 1,000 and 2,200 and between 70 and 20 parts by weight of a polybutane diol adipate and/or a polycaprolactone diol with a mean molecular weight <o>M</o>n of between 1,000 and 2,400. The mixture also contains 1,6- hexamethylenediisocyanate at an equivalence ratio of between 2.3:1.0 and 6.2:1.0 in relation to the polyol mixture and 1,4-butane diol as chain extender, where the equivalence ratio of the 1,4-butane diol in relation to the polyol mixture is between 1.3:1.0 and 5.2:1Ø

L'invention concerne des matières moulables en polyuréthane transformables par voie thermoplastique sous forme de poudre frittée et appropriées pour la fabrication de feuilles frittées grainées. Ces matières moulables sont produites exclusivement à partir de constituants aliphatiques linéaires. Le constituant polyol se compose de 30 à 80 parties en poids d'un polycarbonatediol aliphatique présentant un poids moléculaire moyen <o>M</o>¿n? de 1000 à 2200, et de 70 à 20 parties en poids d'un polybutanedioladipate et/ou d'un polycaprolactonediol présentant un poids moléculaire moyen <o>M</o>¿n? de 1000 à 2400. Le mélange contient également du 1,6-hexaméthylène diisocyanate dans un rapport d'équivalence de 2,3:1,0 à 6,2:1,0, par rapport au mélange de polyol, et du 1,4-butanediol comme allongeur de chaîne, le rapport d'équivalence du 1,4-butanediol par rapport au mélange de polyol étant de 1,3:1,0 à 5,2:1,0.

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