Abstract: There is disclosed a process for reducing the number of gels generated in polyethylene terephthalate (PET) resin. Gels are crosslinked polymers created by thermal and thermo-oxidative degradation induced during polymer production. The instant process comprises the addition of primary and secondary antioxidants prior to the PET polycondensation reaction in order to reduce the amount of thermal degradation which occurs. The polyethylene terephthalate produced by this process formed approximately 25 to 90% fewer gels while maintaining physical properties suitable for use in fiber, film, and molding applications.

Abstract: The present invention is directed to a microporous membrane contactor for degassing liquids at temperatures greater than (>) 60.degree. C. and at pressures greater than or equal (.gtoreq.) to 40 psig. The contactor has a microporous hollow fiber membrane adapted to withstand collapse and resist appreciable pore shrinkage or pore closure when subjected to liquid temperatures greater than (>) 60.degree. C. and liquid pressures greater than or equal to (.gtoreq.) 40 psig for a period of greater than or equal to (.gtoreq.) 30 days. A housing encloses the membrane.

Abstract: This invention provides spiral-wound hollow fiber membrane fabric-containing cartridges and modules for separations and other phase contact applications, including tube sheets having improved solvent resistance and mechanical durability which are fabricated by extrusion of thermoplastic resins having particular defined characteristics, and methods for making the same.