Methacrylate-butadiene-styrene graft polymers and process for their production
AssigneeRohm and Haas Company
InventorsDonald H. Jones, William J. Ferry
Life of this patent
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Abstract
Multi-stage impact modifier having a high rubber content prepared by a process which includes isolation by spray drying in the presence of fumed silica or another inert particulate material in the gaseous drying medium.
Claims8
A process for producing a multiple stage, sequentially produced, impact modifier having a high butadiene content comprising graft polymerizing methyl methacrylate and styrene in any order onto a polymerized butadiene or butadiene-styrene polymer so as to form a latex of a two or more stage polymer, spray drying the resultant graft polymer latex while blowing 0.01 to 5% by weight inert particulate material into the gaseous spray drying medium in the spray dryer, the rubber content of the resultant graft polymer being at least about 70% by weight.
Dependencies are inferred from the claim text.