| abstract |
The present invention relates to a reaction injection molding process for preparing a molded product by reaction of a mixture ofn (a) an organic polyisocyanate; (b) one or more compounds containing at least two isocyanate-reactive groups; (c) about 0.5 to about 40% by weight, based on the weight of the molded product, of rigid microspheres, preferably in admixture with component (b); and, optionally,n (d) an inert gas dissolved in at least one of components (a) or (b) in an amount sufficient to produce a molded product having a density that is at least 1% less than the density of an analogous molded product without an inert gas but which is at least 0.75 g/cm³; and (e) up to 45% by weight, based upon the weight of the molded product, of a reinforcing filler. |