Graft copolymer membrane and processes of manufacturing and using the same
AssigneeGelman Sciences, Inc.
InventorWilliam J. Davis
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Abstract
A cast film, sheet or coating of a crosslinked graft copolymer of an organic polymeric substrate and an ethylenically unsaturated organic monomer is formed by effecting the graft copolymerization while the polymeric substrate and monomer are in solution in a solvent thereby to form the crosslinked graft copolymer in the form of a gel, subjecting the gel to high shear forces to convert it to a thixotropic suspension, forming the thixotropic suspension into a layer, and removing the solvent from the layer.
Claims21
A process for preparing a graft copolymer film, sheet or coating, which comprises forming a reaction mixture comprising an organic polymeric substrate and an ethylenically unsaturated monomer dissolved in an organic solvent, initiating graft copolymerization of said polymeric substrate and said monomer by forming free radicals on said polymeric substrate in said reaction mixture and copolymerizing and crosslinking said polymeric substrate and said monomer while dissolved in said solvent to form a crosslinked graft copolymer of said polymeric substrate and said monomer in the form of a gel, subjecting said graft copolymer in said solvent to high shear forces to convert it from a gel to a thixotropic suspension containing said graft copolymer, forming said thixotropic suspension into a layer thereof on a support, and removing the solvent from said layer thereby to form the film, sheet or coating.
Dependencies are inferred from the claim text.