Process for making clear polyurethane/urea elastomers

Details Process for making clear polyurethane/urea elastomers Process for making clear polyurethane/urea elastomers

1998-03-16

1999-10-05

Sergent, Rabon

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

152151, 301 53, 528 67, 528906, C08G 1810, C08G 1832, C08G 1875, C08G 1876

Patent

active

059626194

ABSTRACT:
A process for making clear elastomers is disclosed. First, a polyol having a narrow molecular weight distribution (Mw/Mn<1.5) reacts an aromatic diisocyanate at an NCO/OH ratio from about 1.3 to about 3.0 to give a non-viscous isocyanate-terminated prepolymer. A mixture that contains this prepolymer and an aliphatic diisocyanate is then reacted with an aromatic diamine to give a clear elastomer. The elastomers have excellent overall physical and mechanical properties, including resilience greater than 55%. The elastomers are valuable for in-line skates and other applications for which clarity is important.

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