JP2015007188A5 - - Google Patents

Claims (11)

A step of mixing a composition containing two or more types of dihydroxy compounds, and a step of continuously supplying a composition containing two or more types of dihydroxy compounds and a composition containing a carbonic diester to a reactor for melt polycondensation A method for producing a copolymeric polycarbonate having
At least one dihydroxy compound is a dihydroxy compound (A) having a fluorene moiety in a part of the structure,
A method for producing a polycarbonate, wherein the step of mixing a composition containing two or more kinds of dihydroxy compounds is a continuous step.   2. The method for producing a polycarbonate according to claim 1, wherein the steps of mixing the composition containing two or more kinds of dihydroxy compounds and the raw material containing the carbonic acid diester are all continuous steps. The method for producing a polycarbonate according to claim 1 or 2, wherein the dihydroxy compound (A) is a dihydroxy compound represented by the following structural formula (1).

(In the general formula (1), R ^{1 to} R ⁴ are each independently a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 20 carbon atoms, a substituted or unsubstituted carbon number 6 to 20 carbon atoms. Or a substituted or unsubstituted aryl group having 6 to 20 carbon atoms, X is a substituted or unsubstituted alkylene group having 2 to 10 carbon atoms, substituted or unsubstituted carbon number A cycloalkylene group having 6 to 20 carbon atoms or a substituted or unsubstituted arylene group having 6 to 20 carbon atoms, m and n are each independently an integer of 0 to 5). The method for producing a polycarbonate according to any one of claims 1 to 3, comprising a step of mixing and dissolving the composition containing the dihydroxy compound (A) with other raw materials.   The polycarbonate according to any one of claims 1 to 4, wherein in the dissolution tank for preparing the liquid containing the dihydroxy compound (A), the liquid level is maintained at 70% or more of the height of the dissolution tank. Manufacturing method.   The polycarbonate according to any one of claims 1 to 5, wherein the dihydroxy compound (A) is a solid having a bulk density of 0.45 g / mL or more and a coefficient of variation of the bulk density of 8% or less. Manufacturing method.   The method for producing a polycarbonate according to any one of claims 1 to 6, wherein the dihydroxy compound (A) contains 1.5% by weight or less of a component having a boiling point of 200 ° C or lower. The production of a polycarbonate according to any one of claims 1 to 7, comprising a dihydroxy compound (B) having a site represented by the following formula (2) in a part of the structure and different from the dihydroxy compound (A). Method.

(However, moiety represented by the formula (2) except when a portion constituting a part of the dihydroxy compound having when a portion constituting a part of -CH ₂ -OH, and said fluorene structure .)   The method for producing a polycarbonate according to claim 8, wherein the dihydroxy compound (B) is a compound having a cyclic ether structure. The method for producing a polycarbonate according to claim 8 or 9, wherein the dihydroxy compound (B) is a compound having a cyclic ether structure represented by the following structural formula (3).

  The method for producing a polycarbonate according to any one of claims 1 to 10, wherein the total amount of dihydroxy compound and carbonic acid diester distilled from all the reaction steps is 2 mol% or less with respect to the charged amount. .