Reaction injection molding process

Details Reaction injection molding process Reaction injection molding process

C - Chemistry, Metallurgy

08

G

402/142, 402/160

C08G 18/32 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01)

Patent

CA 1185743

ABSTRACT OF THE DISCLOSURE The use of certain prepolymers of 4,4'-methylenebis- (phenyl isocyanate), in place of the latter diisocyanate itself in the preparation of polyurethane-polyureas using aromatic diamine extenders, has a number of advantages particularly when the compositions are prepared by reaction injection molding techniques using two streams of reactants. The principal advantages are (i) a useful increase in gel time and (ii) a ratio of amounts of the two reactant streams which more nearly approaches 1 : 1 . This latter factor not only improves the efficiency of mixing of the components in the mixing head but, together with the longer gel time, significantly increases the output of mixed reactants per unit of time. The prepolymers of 4,4'-methylenebis(phenyl isocyanate) employed to achieve the above results are those derived from polyoxy- ethylene polyoxypropylene polyether diols and triols (MW = 1000-10,000), polytetramethylene glycols (MW = 600-5,000) and polyester diols and triols (MW = 500-8,000).

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