C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/123, 400/132
C08G 18/28 (2006.01) C08G 18/40 (2006.01) C08G 18/65 (2006.01)
Patent
CA 1153493
ABSTRACT OF THE DISCLOSURE This invention is directed to polyurethanes and to a process for preparing polyurethanes having a flexural modulus ratio (-29°C/70°C) not greater than 3.4 and having at least three thermal transition temp- eratures between -100°C and the decomposition tempera- ture of the polyurethane as determined by thermomechan- ical analysis. The polyurethane is prepared by admixing and reacting three active hydrogen compounds with a polyisocyanate or polyisothiocyanate wherein one of the active ? ydrogen compounds has a reactivity with a poly- isocyanate greater than the reactivity of either of the other two active hydrogen compounds. The polyurethanes of this invention are suitable for metal replacement applications wherein the polyurethane is formed by reaction injection molding.
331113
Morgan Roy E.
Turner Robert B.
Smart & Biggar
The Dow Chemical Company
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