Polyurethane urea and its preparation method
AssigneeBASF SE
InventorsXiu Juan Zhang, Da Shi, Ming Qian Zhou, Dian Bo Jiang
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Abstract
A polyurethane urea synthesized in a preparation method shows a low modulus, high elongation and good heat-resistance. The polyurethane urea is prepared by a) reacting modified PolyTHF and diisocyanate to obtain a prepolymer, b) adding chain extender and optionally chain terminator into said prepolymer to obtain a polyurethane urea solution, and c) spinning or casting the solution obtained in b) to obtain the polyurethane urea.
Claims20
A polyurethane urea, wherein the breaking elongation (De) thereof is higher than 500%, modulus thereof is less than 10 MPa, strength retention thereof is higher than 80%, rate of elastic recovery RER % thereof is above 85%, energy loss factor (b5) thereof is less than 15, wherein De, modulus and strength retention of said polyurethane urea are tested according to ISO37:2005.
Dependencies are inferred from the claim text.