| http://www.w3.org/ns/prov#value | - Such modified polyols, often referred to as polymer polyols, graft polyols, or graft dispersions, have been fully described in the prior art and include products obtained by the in-situ polymerization of one or more vinyl monomers, for example styrene and acrylonitrile, in polymeric polyols, for example polyether polyols, or by the in situ reaction between a polyisocyanate and an amino- or hydroxy
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