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.
摘要:
Disclosed herein are polysiloxane-polycarbonate copolymer articles. In one embodiment, a ⅛th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75. This article, which has a dimension that is greater than or equal to 1.5 cm, comprises the thermoplastic composition which comprises a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1): wherein each R is, independently, a C1-13 monovalent organic group; and E has an average value of 20 to 35.
摘要:
A monomer and polycarbonate resin are provided, as are methods of making the monomer. The resin may be used to provide a thin film that has a higher dielectric constant and higher glass transition temperature, and similar breakdown strength and similar dissipation factor to films prepared from polycarbonate resins not so modified. The thin films, in turn, may advantageously be used to form, wholly or in part, articles such as capacitors, sensors, batteries, flexible printed circuit boards, keyboard membranes, motor/transformer insulations, cable wrappings, industrial tapes, interior coverage materials, and the like. In particular, a capacitor comprising the polycarbonate resin is also provided.
摘要:
An article includes a membrane having pores and a selectively permeable coating supported by the membrane. The selectively permeable coating includes an antimicrobial agent in an amount that is sufficient to chemically react with a chemical or microbial agent to reduce the biological activity of the chemical or microbial agent or increase an amount of time for a significant amount of unreacted biologically active chemical or microbial agent to pass through the article. A laminate and methods of providing these are also provided.
摘要:
An article includes a membrane having pores and a selectively permeable coating supported by the membrane. The selectively permeable coating includes a hydroxyalkyl-substituted polyalkyleneimine in an amount that is sufficient to chemically react with a chembio agent to reduce the biological activity of the chembio agent or increase an amount of time for a significant amount of unreacted biologically active chembio agent to pass through the article. An associated method is also provided.
摘要:
Disclosed herein are polysiloxane-polycarbonate copolymer articles. In one embodiment, a ⅛th inch thick bar formed from the thermoplastic composition has a B-Y ratio of less than or equal to about 1.75. This article, which has a dimension that is greater than or equal to 1.5 cm, comprises the thermoplastic composition which comprises a polysiloxane-polycarbonate copolymer, wherein the copolymer comprises repeating diorganosiloxane units of formula (1): wherein each R is, independently, a C1-13 monovalent organic group; and E has an average value of 20 to 35.
摘要:
The invention relates to transparent blends of polymers suitable for use in optical articles; the polymers contain residues of BCC and its derivatives, and have properties particularly suited for use in high density optical data storage media. The polymers further contain residues of other polymers, such as α-methyl polystyrene and polystyrene derivatives; bisphenols, such as bisphenol A; cycloaliphatic polyester resins, such as PCCD and its derivatives or some combination of each.
摘要:
A thermoplastic composition is described, based on a copolycarbonate which includes at least two structural units. Structure I is usually a conventional carbonate based on bisphenol A, while structure II is a bisphenol carbonate which includes branched or linear groups extending from a bridging carbon atom or carbon group which connects two aromatic rings. The compositions exhibit very good melt flow, along with enhanced shear-thinning behavior. These characteristics are important for optical disc applications. Thus, related articles are described, along with processes for preparing such articles.
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:
A melt condensation polymerization process for preparing polyester carbonate is provided which comprises the reaction of an aromatic dihydroxy compound, carbonic acid diester and catalyst with a diacid.