Rigid thermoplastic polyurethane comprising units of butane...

C - Chemistry – Metallurgy – 08 – G

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C08G 18/65 (2006.01) C08G 18/32 (2006.01) C08G 18/66 (2006.01)

Patent

CA 2252459

The present invention is a rigid thermoplastic polyurethane (RTPU) comprising units of butane diol (BDO) and a polyethylene glycol (PEG) of the type HO-(CH2CH2O)n -H, where n is an integer from 2 to 6. The RTPU of the present invention addresses a problem in the art by providing a potentially lower-cost alternative to an RTPU prepared from hexane diol, and further providing an RTPU that can be customized to a desired toughness, T g, yield strength, and transparency. The RTPUs that are prepared from certain mole ratios of BDO and the PEG exhibit a surprisingly high degree of toughness manifested by increased tensile elongation to break.

La présente invention porte sur un polyuréthane thermoplastique rigide (PUTR) renfermant des unités de butanediol (BDO) et un poly(éthylèneglycol) (PEG) de type HO-(CH2CH2O)n -H, où n est un entier de 2 à 6. Le PUTR de la présente invention répond à un problème dans ce secteur en proposant une solution de remplacement à un coût potentiellement moindre pour la préparation de PUTR à partir d'hexanediol, et pour l'obtention d'un PUTR pouvant être conçu avec la résistance, la Tg, le rendement et la transparence souhaités. Les PUTR qui sont préparés à partir de certaines proportions de BDO et de PEG révèlent un niveau de résistance étonnamment élevé, se manifestant par un plus grand allongement par traction à la rupture.

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