An efficient method for the synthesis of fluorenebisphenoxy derivatives from fluorenone and phenoxy compounds is successfully performed by the combined use of concentrated sulfuric acid as catalyst and 3-mercaptopropionic acid as co-catalyst. Several fluorenebisphenoxy derivatives are obtained in good yields by this one-step reaction.
POLYCARBONATE RESIN AND TRANSPARENT FILM FORMED FROM SAME
申请人:Mitsubishi Chemical Corporation
公开号:EP2578616A1
公开(公告)日:2013-04-10
A polycarbonate resin which is excellent in terms of optical properties, hue, thermal stability, and mechanical properties and a transparent film formed from the resin are provided. The invention relates to a polycarbonate resin which has a glass transition temperature of 110-150°C and a reduced viscosity, as measured at 20°C with respect to the methylene chloride solution having a concentration of 0.6 g/dL, of 0.30-0.46, and which, when being molded, gives a film wherein the ratio of the retardation thereof measured at a wavelength of 450 nm (Re450) to the retardation thereof measured at a wavelength of 550 nm (Re550) is 0.50-0.93.
An object is to obtain a polycarbonate resin excellent in the heat resistance and impact resistance and endowed with high surface hardness.
A polycarbonate resin composition (X), comprising: (A) a polycarbonate resin containing (a) a structural unit derived from a dihydroxy compound having a moiety represented by the following formula (1) in a part of a structure; and (B) an aromatic polycarbonate resin, wherein a reduced viscosity of the aromatic polycarbonate resin (B) is 0.55 dl/g or less, a proportion of the aromatic polycarbonate resin (B) in the polycarbonate resin composition (X) is 30 wt% or more, and a total light transmittance of the polycarbonate resin composition (X) is 90% or less:
[Chem. 1] (̵CH2-O)̵ (1)
The present invention is a production method of a polycarbonate resin, including a step of performing melt polycondensation by continuously feeding a dihydroxy compound (A) having a predetermined moiety in a part of the structure and a carbonic acid diester each in a liquid state to a reactor, wherein the residence time from liquefaction of the dihydroxy compound to its feeding to a reactor is from 0.1 to 10 hours.
METHOD FOR PRODUCING POLYCARBONATE, AND POLYCARBONATE PELLETS
申请人:Mitsubishi Chemical Corporation
公开号:EP2692768A1
公开(公告)日:2014-02-05
The present invention relates to a method for producing a polycarbonate having excellent characteristics such as hue and mechanical properties with a stable quality and a high yield by solving a plurality of problems as those described above in producing a polycarbonate by using a specific dihydroxy compound exhibiting low thermal stability as compared with bisphenols and having a -CH2-O- structure.