A polymer including a first structural unit represented by Chemical Formula 1:

##STR00001## wherein L.sup.1, R.sup.1 to R.sup.5 and n1 in Chemical Formula 1 are the same as described in the detailed description.

Systems and methods for treatment of an effluent stream are disclosed. In an aspect, a system can comprise an input configured to receive a brine solution, a purification component in communication with the input and configured to receive the brine solution therefrom, the purification component comprising activated carbon, wherein the brine solution is caused to pass through the activated carbon to produce a purified solution, and an output in communication with the purification component to receive the purified solution therefrom.

The present invention relates to polycarbonates comprising specific phenolic building blocks which are terminated with at least one aromatic group which can be optionally substituted with at least one C.sub.1-C.sub.6 alkyl group have a saponifiable chlorine content of 0.2 ppm to 19 ppm and a number average molecular weight of 8 000 g/mol to 20 000 g/mol, a molding compound comprising said polycarbonate, a molded article comprising said polycarbonate and a process for preparing a specific polycarbonate.

The present invention relates to polycarbonates comprising specific phenolic building blocks which are terminated with at least one aromatic group which can be optionally substituted with at least one C.sub.1-C.sub.6 alkyl group have a saponifiable chlorine content of 0.2 ppm to 19 ppm and a number average molecular weight of 8 000 g/mol to 20 000 g/mol, a molding compound comprising said polycarbonate, a molded article comprising said polycarbonate and a process for preparing a specific polycarbonate.

The invention provides an aromatic polycarbonate resin composition that is excellent in thermal stability and moisture and heat resistance, and makes a molded article that has wavelength-selective absorption properties and is further excellent in the thermal stability and photostability of absorption properties, and also a molded article thereof.

The invention is a resin composition including, per (A) 100 parts by weight of an aromatic polycarbonate resin (component A), (B) 0.03 to 1.2 parts by weight of a colorant having an absorption maximum at less than 650 nm (component B), (C) 0.001 to 0.3 parts by weight of a colorant having an absorption maximum at 650 nm or more and less than 870 nm (component C), (D) 0.001 to 0.3 parts by weight of a colorant having an absorption maximum at 870 nm or more and less than 1,000 nm (component D), and (E) 0.003 to 0.5 parts by weight of a phosphorus-based thermal stabilizer and/or a phenol-based thermal stabilizer (component E), the resin composition being configured such that an average value of through-thickness light transmittance of a 3-mm-thick molded article thereof at 400 nm to 870 nm is 1.5% or less.

The invention provides an aromatic polycarbonate resin composition that is excellent in thermal stability and moisture and heat resistance, and makes a molded article that has wavelength-selective absorption properties and is further excellent in the thermal stability and photostability of absorption properties, and also a molded article thereof.

The invention is a resin composition including, per (A) 100 parts by weight of an aromatic polycarbonate resin (component A), (B) 0.03 to 1.2 parts by weight of a colorant having an absorption maximum at less than 650 nm (component B), (C) 0.001 to 0.3 parts by weight of a colorant having an absorption maximum at 650 nm or more and less than 870 nm (component C), (D) 0.001 to 0.3 parts by weight of a colorant having an absorption maximum at 870 nm or more and less than 1,000 nm (component D), and (E) 0.003 to 0.5 parts by weight of a phosphorus-based thermal stabilizer and/or a phenol-based thermal stabilizer (component E), the resin composition being configured such that an average value of through-thickness light transmittance of a 3-mm-thick molded article thereof at 400 nm to 870 nm is 1.5% or less.

Provided is a polycarbonate copolymer including a repeating unit of the following Chemical Formula 1, where the polycarbonate copolymer can have improved heat resistance: ##STR00001##
wherein in Chemical Formula 1, R.sub.1, R.sub.2, n1 and n2 are as defined in the specification.

Provided is a polycarbonate copolymer including a repeating unit of the following Chemical Formula 1, where the polycarbonate copolymer can have improved heat resistance: ##STR00001##
wherein in Chemical Formula 1, R.sub.1, R.sub.2, n1 and n2 are as defined in the specification.