Abstract: Described herein is a molded plastic pressure vessel for biopharmaceutical applications and methods thereof. The molded plastic pressure vessel has a surface area of at least 500 inches2 and comprises a polyphenylene oxide polymer; and at least one antioxidant.

Abstract: A pleated filter element includes a composite depth filter medium formed into a plurality of pleats. The composite depth filter medium includes a plurality of depth filter media layers. Each of the plurality of depth filter media layers includes adsorber particulate matter. Each of the plurality of depth filter media layers may have a thickness less than about 1300 microns. The plurality of depth filter media layers may have at least 50% by weight of adsorber particulate matter.

Abstract: The present invention provides novel concentric filter elements that have advantages over traditional concentrically arranged filters as well as filters comprising a single cylindrical filter element.

Abstract: Phase inversion microporous membranes including at least two different pore size regions are provided, wherein two membrane sheets are placed, back-to-back, such that the qualifying pore zones are positioned internally within the structure. Exemplary membranes according to the present disclosure provide excellent thermal stability and retention characteristics. Methods for fabricating and using the disclosed membrane structures are also provided according to the present disclosure.

Abstract: A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.

Abstract: A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.

Abstract: A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.

Abstract: A method for producing charge-modified polyester comprising treating the polyester with at least one agent sufficient to cause hydrolysis of the polyester and a charge-modifier having one or more epoxy groups with a fixed formal charge, resulting in the formation of a bond between the one or more epoxy groups and the polyester. The polyester may be treated with the agent, which is presently preferred to be an alkaline, amine, or combination of both, and charge-modifier, which could have a positive or negative charge.

Abstract: A method for sealing the edges of a filter sheet (10) with wax to create a fluid-impermeable wax seal (11) enclosing a non-sealed portion (12). The method includes applying melted wax to the edges of the filter sheet, heating the treated filter sheet such that the wax permeates through the edges thereof, and then allowing the filter sheet to cool such that the wax congeals. The wax of the fluid-impermeable wax layer (11) has a durometer reading of about 75 to about 100 Shore A hardness at 25° C. and 85° C., a melt point of about 110° C. to about 180° C., a viscosity of less than about 100 cp at 155° C. and preferably includes ethylene bis stearamide. The wax layer increases the useful life of the filter sheet while providing a sheet which is easily released from a filter press and which retains integrity along the seal during repeated hot water sanitations.

Abstract: A filter sheet positioned between plates (14) of a filter press has a fluid-impermeable wax layer (11) sealing the sheet's perimeter. The wax preferably comprises ethylene bis stearamide and has a durometer reading of about 75 to about 100 Shore A hardness at 25.degree. C. and 85.degree. C., a melt point of about 110.degree. C. to about 180.degree. C., and a viscosity of less than about 100 cp at 155.degree. C. The wax layer increases the useful life of the filter sheet while providing a sheet which is easily released from a filter press and which retains integrity along the seal during repeated hot water sanitations.

Abstract: A filter sheet is provided which comprises a self-supporting fibrous matrix having immobilized therein particulate filter aid and particulate ion exchange resin, wherein said particulate filter aid and particulate ion exchange resin are distributed substantially uniformly throughout a cross-section of said matrix. A process for removing ionic impurities from a photoresist solution is also provided which comprises passing the photoresist solution through said filter sheet to remove ionic impurities therefrom.