Patent ID: 6271275
Filing Date: 2001-08-07
Classification: B01F,C08G

Abstract:
A method of making polyurethane foam, comprising:forming a first liquid precursor into a froth having a void fraction ranging from about 6 percent to about 16 percent, said first liquid precursor comprising a polyol;next, directing a stream of the froth into a free space; anddirecting a stream of a second precursor comprising an isocyanate into the free space so as to contsct and mingle with the stream of froth in said free space without the assistance of a through-flow mixing chamber or device, the two streams being maintained separate from each other prior to being directed into the free space such that the streams first make contact and mingle with each other in the free space and thereby react to form a polyurethane foam at a flow rate ranging from about 1 to about 10 pounds per minute.