Graft copolymers polyol polyethers

Modified polyether polyols have appeared in recent years, i.e., graft polyether polyols (polymer polyols, copolymer polyols) which were first developed by Union Carbide Corp. in the mid-1960 s. 

MA can be used as comonomer together with the vinylic monomers (ternary copolymerisation ACN - styrene - MA) and the graft species is formed in situ by the reaction of the resulting copolymer ACN - styrene - MA with the polyether polyol, by its terminal hydroxyl groups. Another variant is to use a styrene - MA copolymer as NAD. This copolymer proved to be a very good NAD for high styrene content polymer dispersions in polyethers. Of course the real NAD is made by the reaction of a MA unit with the terminal hydroxyl group of the poly ether [57]. 

More recently, filled polyethers (so called polymer polyols ) have been introduced. These contain dispersed organic filler such as acrylonitrile-styrene copolymer or polyurea, some of which is grafted on to the polyether chain. Filled polyethers are used principally for flexible foams of high resilience. 

Polypropylene-graft-maleic anhydride. See PropylenefMA copolymer Poly (propylene oxide). See Polypropylene glycol Polypropylene polyether polyol. See Polyether polyol Polyquaternlum-1... 

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