C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
18/1106, 402/133
C08G 18/10 (2006.01) B29C 41/00 (2006.01) C08G 18/08 (2006.01) B29C 41/04 (2006.01)
Patent
CA 1124440
ABSTRACT OF THE DISCLOSURE : Polyurethanes having a fine particle size are prepared according to a suspension process wherein silicone surfactants are utilized and the polymerization is carried out under agitation in a nonaqueous and a nonsolvent system according to either a two step, or preferably a one step process. The produced suspension-type polyurethanes are generally powders or very small granules and, therefore, can be utilized directly for rotational or spin molding processes wherein they are cured through the use of specific curing agents. Additionally, generally any suspension po- lyurethanes having a plasticity value of at least 2,000 square mm. at 150-C, can be cured in a rotational or spin molding operation utilizing specific curing agents and curing at a temperatures below the decompositions temperature of the polyurethane, for example, below 250°C.
300863
Conard Wendell R.
Futamura Shingo
Hayes Robert A.
Firestone Tire & Rubber Company (the)
Robic Robic & Associes/associates
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