Bloom-free thermoplastic polyurethane compositions
AssigneeBayer Aktiengesellschaft
InventorsJames N. Rieck, Joseph M. Jupa
Life of this patent
Estimating the term…
Abstract
Blooming in certain thermoplastic polyurethane products is substantially or completely eliminated by including a chain terminator. More specifically, at least one hydroxy functional polyester polyol having a molecular weight of at least 500 and a hydroxyl functionality of at least 2, a chain extender and an organic diisocyanate are combined with a chain terminator. The chain terminator which is preferably a monofunctional compound that is reactive with an isocyanate. These reactants are used in amounts such that the of NCO/H index of the formulation is at or near 100.
Claims16
A method for reducing blooming in a thermoplastic polyurethane by combining
- (1) at least one hydroxy functional polyester polyol having a molecular weight of at least 500 and a hydroxyl functionality of at least 2,
- (2) a chain extender,
- (3) an organic diisocyanate and
- (4) a chain terminator selected from monofunctional alkylene alcohols having at least 14 carbon atoms, monoisocyanates and monoamines in amounts such that an NCO/H index which is at or near 100 is achieved.
The method of claim 7 in which chain terminator (4) is a monofunctional alcohol.
Dependencies are inferred from the claim text.