Abstract:
An improvement in processes for preparing diaryl sulfones comprising adding a limited amount of water to the reaction product mixture of such processes to form a heavier aqueous phase containing unreacted monosubstituted benzene sulfonic acid with less than an equal amount of water, separating the aqueous phase, and dehydrating the aqueous phase to recover the unreacted sulfonic acid for forming additional diaryl sulfone.
Abstract:
A continuous plastic laminate having improved stiffness at use temperature, comprising at least three melt coextruded sheets, each comprising a thermoplastic polymer or polymer blend, the outside sheets having a higher stiffness at use temperature than at least one inside sheet, wherein said continuous laminate contains laminate scrap derived from the production of said laminate, said scrap being incorporated therein by melt coextruding said scrap as at least one additional discrete inside layer or by melt coextruding said scrap as part of at least one of said melt coextruded sheets, whereby the stiffness at use temperature of said scrap-containing laminate is increased relative to a plastic laminate identical thereto except for the incorporation of said scrap, and wherein said thermoplastic polymer or polymer blend comprises a polyarylether sulfone, a poly(aryl ether), a polyarylate, a polyetherimide, a polyester, an aromatic polycarbonate, a styrene resin, a poly(alkyl acrylate), a polyhydroxyether, a polyamide, a poly(arylene sulfide), a crystalline polyolefin, a polyphenylene oxide, or blends thereof.
Abstract:
Crystalline block polymers and chain extended polymers containing blocks of crystalline poly(aryl ether ketones). Also described herein are monomers and oligomers suitable for preparing the crystalline block polymers and chain-extended polymers. Further, described herein are methods for producing the crystalline block and chain-extended polymers, as well as the monomers and oligomers.
Abstract:
Method of producing a coformed catalyst suitable for use in the aldol-type condensation of saturated aliphatic monocarboxylic acid compound and formaldehyde compound comprising at least one cation of a Group I or Group II metal and silica support, comprising gelling an aqueous composition comprising silica colloid and at least one cation of a Group I or Group II metal, drying the composition and calcining.