Abstract:
A multilayer thermoformable film comprises (A) a top-layer thermoplastic film having an inner surface and an outer surface, where the top layer thermoplastic film has a softening temperature, (B) at least one mask layer thermoplastic film, where the mask layer thermoplastic film has a softening temperature that is within about 30 degrees centigrade of the softening temperature of the top layer film, and (C) at least one tielayer disposed between the inner surface of the top layer film and the mask layer.
Abstract:
A method of preparing block copolyestercarbonates wherein at least one dihydroxysubstituted aromatic hydrocarbon moiety and at least one aromatic diacid chloride are reacted under interfacial conditions to give a hydroxy-terminated polyester intermediate. The dihydroxy-substituted aromatic compound is used in about 10 mole to about 125 mole percent excess relative to the diacid chloride. Enhanced control of hydroxy-terminated polyester intermediate molecular weight is achieved by limiting the amount of water present to provide a final salt level of greater than 30 percent. The final salt level is a theoretical value but is readily calculable. The hydroxyterminated polyester intermediate is then converted to a block copolyestercarbonate by reaction with a carbonate precursor such as phosgene.
Abstract:
Improved methods for reducing boron concentration in seawater or brackish water, while simultaneously maintaining or improving the salt rejection of membrane and flow performance of polyamide reverse osmosis (RO) membranes include contacting the water with a composite membrane comprising moieties derived from an aromatic sulfonyl halide, a heteroaromatic sulfonyl halide, a sulfinyl halide; a sulfenyl halide; a sulfuryl halide; a phosphoryl halide; a phosphonyl halide; a phosphinyl halide; a thiophosphoryl halide; a thiophosphonyl halide, an isocyanate, a urea, a cyanate, an aromatic carbonyl halide, an epoxide or a mixture thereof.
Abstract:
The present invention provides a composite membrane comprising a porous base membrane and a polyamide coating disposed on said porous base membrane, said polyamide coating comprising a C 3 -C 8 cyclic carbonyl compound and a C 1 -C 8 amide compound, said amide compound comprising at least one N-H moiety. In addition the present invention presides a method of preparing a composite membrane comprising contacting under interfacial polymerization conditions an organic solution comprising a polyacid halide with an aqueous solution composing a polyamine, said contacting being carried out on a surface of a porous base membrane, said organic solution further comprising a C 3 -C 8 cyclic carbonyl compound, said aqueous solution comprising a C 1 -C 8 amide compound, said amide compound comprising at least one N-H moiety.
Abstract:
Provided is a composition including a polyarylene ether polymer or copolymer comprising a zwitterion, or a polyarylene polymer or copolymer comprising a zwitterion. Also provided is a process that includes attaching a zwitterion to a polymer or a copolymer, wherein the polymer or copolymer comprises a polyarylene ether or a polyarylene. Also provided is a membrane that is formed from the composition.
Abstract:
Membranes comprising functional polyarylether having structural units of formula (I) are useful for hemodialysis and hemofiltration, wherein X is selected from Br, NR 4 R 5 , OOCR 6 , OR 7 , NR 4 CONR 5 R 6 , NR 4 COOR 5 R 6 and combinations thereof; R 1 , R 2 and R 3 are independently at each occurrence CH 2 X, H, halo, cyano, nitro, a C 1 -C 12 aliphatic radical, a C 3 -C 12 cycloaliphatic radical, a C 3 -C 12 aromatic radical or a combination thereof; R 4 and R 5 are independently H, a C 1-10 aliphatic radical, a C 3 -C 12 cycloaliphatic radical, a C 3 -C 12 aromatic radical, or a combination thereof; R 6 is H, a C 2-10 aliphatic radical, a C 3 -C 12 cycloaliphatic radical, a C 3 -C 12 aromatic radical or a combination thereof; R 7 is OCH 2 CH 2 (OCH 2 CH 2 ) n OH or OOCCH 2 (OCH 2 CH 2 ) n CH 3 ; Z is a direct bond, O, S, SO, SO 2 , CO, phenylphospinyl oxide, alkenyl, alkynyl, a C 1 -C 12 aliphatic radical, a C 3 -C 12 cycloaliphatic radical, a C 3 -C 12 aromatic radical or a combination thereof; a, b, and c are independently 1 or 2; and m, n and p are independently 0 or 1.