摘要:
According to the present invention, there is provided an improvement which comprises adding an acid compound and if necessary an epoxy compound to a reaction product resulting from melt polycondensation reaction of an aromatic dihydroxy compound with a carbonic acid diester in the presence of an alkaline compound catalyst.
摘要:
A polycarbonate composition which contains 60-95 parts by weight of a polycarbonate with a terminal hydroxyl group concentration of 5-95 mol % and 40-5 parts by weight of polyester.
摘要:
The method of the present invention is a hot-melt polycondensation for an aromatic dihydroxy compound and a dicarbonate in the presence of a basic catalyst, adding sulfur-containing acid compound with a pKa value less than 3 or the derivative thereof, and 5-1,000 ppm of water, and additives as needed for the polycarbonate while the reaction product polycarbonate is still in a molten state, and kneading the material.
摘要:
The present invention provides copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and water resistance obtained by copolymerization of two or more aromatic dihydroxy compounds and a compound capable of reacting with those aromatic dihydroxy compounds to form carbonate linkages, characterized in that, of all the constituent repeating units derived from aromatic dihydroxy compounds, 2-40 mole % are derived from resorcin and/or substituted resorcins.
摘要:
A copolycarbonate and a copolycarbonate composition having oustanding hardness and a method for their manufacture.A copolycarbonate containing the component units shown in Formula �I!below in the amount of 50-99 mole %: ##STR1## X is ##STR2## R1 and R2 are hydrogen atoms or monovalent hydrocarbon groups, and R3 is a bivalent hydrocarbon group.) The Rockwell hardness (M scale) of this polycarbonate should preferably be 45-90.
摘要:
A method for manufacturing polycarbonate in which an aromatic dihydroxy compound and a carbonic acid diester can be effectively subjected to melt polycondensation using a small amount of a catalyst, making it possible to manufacture polycarbonate having outstanding color matching, outstanding thermal stability, color-matching stability, etc., during molding, and outstanding water resistance is characterized in that when an aromatic dihydroxy compound and a carbonic acid diester are subjected to melt polycondensation in the presence of a catalyst, the catalyst is dissolved or dispersed as a catalyst solution, this catalyst solution is added to the melt polycondensation reaction system, and the aromatic dihydroxy compound and carbonic acid diester are subjected to melt polycondensation.
摘要:
A copolycarbonate and a copolycarbonate composition having oustanding hardness and a method for their manufacture.A copolycarbonate containing the component units shown in Formula [I]below in the amount of 50-99 mole %: ##STR1## X is ##STR2## R1 and R2 are hydrogen atoms or monovalent hydrocarbon groups, and R3 is a bivalent hydrocarbon group.) The Rockwell hardness (M scale) of this polycarbonate should preferably be 45-90.
摘要:
The purpose of the present invention is to provide a method for manufacturing polycarbonate in which polycarbonate having outstanding color matching, outstanding thermal properties, particularly retention stability during molding, and outstanding water resistance can be effectively and easily manufactured.In the method for manufacturing polycarbonate of the present invention, an aromatic dihydroxy compound and a carbonic acid ester are subjected to melt condensation polymerization in the presence of a catalyst composed of(a) an aliphatic amine with 24-60 carbon atoms, and (b) an alkali metal compound and/or alkaline earth metal compound.The (a) aliphatic amine having 24-60 carbon atoms should preferably be an aliphatic tertiary amine and be used in the amount of 1.times.6.sup.-6 -1.times.10.sup.-1 moles for each mole of the aromatic dihydroxy compound, and the (b) alkali metal compound and/or alkaline earth metal compound should be used in an extremely minute specified amount.
摘要:
The object of the present invention is to provide a method of producing copolymerized polycarbonates having improved flow and formability, in addition to excellent mechanical properties, heat resistance, transparency, and color tone.A method of producing copolymerized polycarbonates by melt polycondensation of two or more aromatic dihydroxy compounds with a carbonate diester, characterized in that(i) resorcin and/or substituted resorcins are used as 2-90 mole % of the aromatic dihydroxy compounds, where the sum of all the aromatic dihydroxy compounds is taken as 100 mole %, and(ii) an alkali metal compound and/or an alkaline-earth metal compound (a) is used as the catalyst.
摘要:
A heat resistant copolycarbonate comprises a component of the formula: ##STR1## and a component selected from: ##STR2## R.sup.1 and R.sup.2 are same or different halogens or monovalent hydrocarbons, R.sup.3, R.sup.4, R.sup.6 and R.sup.7 are hydrogen atoms or monovalent hydrocarbons, R.sup.5 and R.sup.8 are bivalent hydrocarbons, R.sup.a, R.sup.b, R.sup.c R.sup.d, R.sup.e, R.sup.f, R.sup.g R.sup.j, R.sup.k and R.sup.l are the same or different halogen atoms, hydrocarbon groups having 1-10 carbon atoms, or hydrocarbon groups having 1-10 carbon atoms which are at least partially halogen-substituted and R.sup.b and R.sup.c may also be hydrogen, m, n, s, t, u, v and w are integers from 0-4, p and q are integers from 0-3 and r is an integer from 1-10.