A process for making bloom-free thermoplastic polyurethane...

Details A process for making bloom-free thermoplastic polyurethane... A process for making bloom-free thermoplastic polyurethane...

C - Chemistry, Metallurgy

08

G

C08G 18/72 (2006.01) C08G 18/08 (2006.01) C08G 18/28 (2006.01) C08G 18/32 (2006.01) C08G 18/66 (2006.01) C08G 18/71 (2006.01) C08G 18/82 (2006.01)

Patent

CA 2386488

A method for making a bloom-free thermoplastic polyurethane is disclosed. The method entails blending a chain terminator such as monofunctional alkylene alcohol having at least 14 carbon atoms, mono- isocyanate and mono-amine, in a thermoplastic polyurethane that would, but for the blending of the chain terminator of the invention, feature a blooming defect. The polyurethane suitable for the use in the inventive process is the product of a reaction wherein reactants comprise (i) at least one hydroxy functional polyol such as polyester polyol, polyether polyol and polycarbonate polyol, having a number average molecular weight of 500 to 5000 and a hydroxyl functionality of at least 2, (ii) a chain extending compound, and (iii) an organic diisocyanate. The ratio NCO/H characterizing the relative amounts of named reactants is 0.95 to 1.05. The addition of the chain terminator renders the product bloom-free.

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