초록 ▼

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-c

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, Tg, 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.

대표청구항 ▼

A rigid thermoplastic polyurethane comprising: a) units of a diisocyanate; b) units of a polyethylene glycol having the structure HO－(CH2CH2O)n－H, where n is an integer from 2 to 6; c) units of butane diol; and d) not more than 25 weight percent of units of a high molecular weight diol based on the

A rigid thermoplastic polyurethane comprising: a) units of a diisocyanate; b) units of a polyethylene glycol having the structure HO－(CH2CH2O)n－H, where n is an integer from 2 to 6; c) units of butane diol; and d) not more than 25 weight percent of units of a high molecular weight diol based on the total weight of the rigid thermoplastic polyurethane, the rigid thermoplastic polyurethane being further characterized by having a Tg of at least 50°C., with the proviso that when the polyethylene glycol is triethylene glycol, at least one of the following limitations apply: a) the mole-to-mole ratio of the units of the triethylene glycol to the units of the butane diol is from 25:75 to 90:10: b) the rigid thermoplastic polyurethane comprises not more than 1.9 weight percent of units of the high molecular weight diol; or c) the thermoplastic polyurethane is optically transparent.