摘要:
Copolyestercarbonates comprising carbonate structural units derived from at least one dihydroxyaromatic compound, preferably bisphenol A, and ester units derived from a dihydroxyaromatic compound and a composition comprising at least one C36 dimer acid may be prepared by an interfacial phosgenation method conducted at a pH in the range of about 9-11. The copolyestercarbonates have properties which are often superior to those of corresponding polymers prepared, for example, from dodecanedioic acid.
摘要:
The present invention related to a method for preparing a polyestercarbonate, the method comprising: a) reacting a dihydric phenol and a diacid having from 12 to about 30 carbon atoms in the presence of an effective amount of carbonate precursor, thereby forming a reaction mixture, wherein the pH of the reaction mixture is maintained in an initial pH range of from about 8.5 to about 9.5 for about 50% to about 95% of the total carbonate precursor addition, and a second pH range of from about 10 to about 12 for the remainder of the carbonate precursor addition.
摘要:
This invention relates to polyestercarbonates comprising residues of at least one branched aliphatic dicarboxylic acid, and methods for preparation of polyestercarbonates comprising residues of at least one branched aliphatic dicarboxylic acid. This invention further relates to articles and methods of making articles from the polyestercarbonates.
摘要:
A method is provided for making siloxane polycarbonate copolymers and blends of other polycarbonates with such copolymers wherein the copolymers and blends have excellent transparency and physical characteristic.
摘要:
An article comprises a first layer which includes a substrate and a nucleophilic organic polymer cross-linked on a surface of or within the substrate. The cross-linked nucleophilic polymer comprises functional groups operative to form a covalent bond with a chemical or biological agent. The first layer also includes reactive particles located on a surface of or within the substrate.
摘要:
Siloxane bischloroformates are prepared in a continuous process by phosgenating siloxane bisphenols in a flow reactor using a substantial excess of phosgene and sodium hydroxide. While very high levels (>95%) of conversion of the siloxane bisphenol to the corresponding siloxane bischloroformate are achieved using a flow reactor according to the method of the invention, only more modest conversion (˜90%) of the siloxane bisphenol to the corresponding siloxane bischloroformate is attained when analogous batch processes are employed. The process holds promise for use in the manufacture of silicone-containing copolycarbonates which requires high purity siloxane bischloroformate intermediates.
摘要:
The damping performance of an article and a polycarbonate composition is improved and a storage medium for data is provided with a glass transition temperature greater than about 150° C.
摘要:
The damping performance of an article and a polycarbonate composition is improved and a storage medium for data is provided which comprises the use of at least one ortho-methyl substituted polycarbonate structure.
摘要:
Flame retardant blends comprising a polycarbonate portion containing spirobiindane units, at least one addition polymer such as a styrene-acrylonitrile or ABS copolymer, and at least one phosphoryl flame retardant have high temperature stability properties superior to those of similar blends not containing the spirobiindane units. Blends in which the polycarbonate portion contains such units in amounts up to 5 mole percent also have excellent ductility.
摘要:
Copolycarbonates having low intrinsic birefringence comprise structural units derived from hydroxyphenylindanol, from resorcinol, alkylenedioic acid or eugenolsiloxane, and, optionally, from a bisphenol, preferably bisphenol A. The copolycarbonates are useful for the fabrication of optical data recording media such as compact disks.