C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/132
C08G 18/10 (2006.01)
Patent
CA 1333436
This invention relates to a process for pre- paring polyurethane and/or polyurea elastomer compris- ing reacting a liquid preformed isocyanate-terminated prepolymer with a chain extender mixture, which chain extender mixture comprises (a) a mixture comprising a hydroxyl-terminated chain extender and an aromatic amine-terminated chain extender, and/or an aliphatic amine-terminated compound, or (b) a mixture comprising an aromatic amine-terminated chain extender and an aliphatic amine-terminated compound, wherein the isocyanate index is from 70 to 200. The prepolymer is the reaction product of a stoichiometric excess of a polyisocyanate and a relatively high equivalent weight isocyanate-reactive compound. In this process, it is possible to prepare elastomers having excellent properties, particularly excellent flexural and thermal properties, which prop- erties are difficult to obtain in a one-step process. The reactivity of the chain extender mixture with the prepolymer is such that this process is easily carried out, making it possible to mix the reactants and fill the mold before gelling occurs, yet providing an elas- tomer which has good green strength at demold.
523955
Peffley Richard D.
Spells John Henry
Vanderhider James A.
Smart & Biggar
The Dow Chemical Company
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