C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
C08G 18/10 (2006.01) C08G 18/22 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08K 5/00 (2006.01)
Patent
CA 2188504
This invention relates to solid elastomeric polyurethanes prepared by reacting, in an open mold at an isocyanate index of 80 to 120, (a) an isocyanate prepolymer having an isocyanate content of 3 to 15% by weight and a number average molecular weight of 550 to 20,000 prepared by the reaction of (1) organic polyisocyanates having 2 to 3 NCO groups, and (2) isocyanate-reactive polyester polyols having two to three isocyanate-reactive hydroxyl groups and a number average molecular weight of 400 to 10,000 and prepared in the presence of an esterification catalyst, and optionally containing other isocyanate-reactive compounds, wherein the equivalent ratio of isocyanate groups to isocyanate- reactive groups is 1.2:1 to 34:1; (b) a diol chain extender, optionally in admixture with a crosslinker and/or an amino-containing chain extender and/or crosslinker; (c) 0.001 to 10% by weight, based on the weight of the isocyanate prepolymer, of a catalyst; and (d) 0.01 to 5% by weight, based on the isocyanate prepolymer, of surface skinning retardants consisting of (1) certain carboxylic acids and derivatives thereof, (2) 1,2-diketones, 1,3-diketones, and aromatic hydroxyketones; (3) mono- and dihydric phenols, (4) N- substituted ureas and thioureas, and/or (5) certain phosphorus compounds.
Pantone Richard S.
Sarpeshkar Ashok M.
Corporation Bayer
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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