Suspension polymerization of polyurethanes and spin-molding the

Details Suspension polymerization of polyurethanes and spin-molding the Suspension polymerization of polyurethanes and spin-molding the

1977-04-18

1978-08-15

Cockeram, H.S.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264311, 427 13, 427 85, 528 48, 528 65, 528 61, 528 59, 528 50, B29C 504, C08G 1882, C08G 1883, C08G 1886

Patent

active

041072561

ABSTRACT:
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 polyurethanes having a plasticity value of at least 2,000 square mm. at 150.degree. C, can be cured in a rotational or spin molding operation utilizing specific curing agents and curing at a temperature below the decomposition temperature of the polyurethane, for example, below 250.degree. C.

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