Method of removing polybutadiene gels from solutions
AssigneeUnited States Steel Corporation
InventorRichard C. Weil
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Abstract
Solutions of polybutadiene in styrene are filtered through filter media of viscose rayon to remove and/or eliminate gels of sizes greater than about fifty microns.
Claims6
Method of removing gels from a solution of polybutadiene in styrene comprising passing the solution through a filter medium of viscose rayon felt.
Method of removing gels from successive solutions of about 5% to about 10% polybutadiene in styrene comprising passing said solutions through a filter medium of viscose rayon felt having an average pore size of about 15 to about 50 microns.
Method of making a gel-free, high-impact polystyrene comprising cutting a polybutadiene rubber into small pieces, dissolving it in styrene to form a solution containing about 5% to about 10% polybutadiene, filtering said solution through a filter of viscose rayon felt, and polymerizing the styrene.
Dependencies are inferred from the claim text.