Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1990-03-07
1992-05-12
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528196, 528370, 528371, C08G 6414
Patent
active
051129361
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to branched polycarbonate and a process for production thereof, and more particularly to branched polycarbonate excellent in impact resistance and suitable for blow molding and a process for production thereof.
BACKGROUND ART
Heretofore, a process for production of polycarbonate using phloroglucinol, trimellitic acid or 1-[.alpha.-methyl-.alpha.-(4'-hydroxyphenyl)ethyl]-4-[.alpha.',.alpha.'-bi s(4"-hydroxyphenyl)ethyl]benzene as a branching agent has been known, and it is disclosed in, for example, Japanese Patent Publication Nos. 23918/1972, 11733/1985, and Japanese Patent Application Laid-Open No. 146920/1987.
However, polycarbonates produced by the above processes are all insufficient in impact resistance and suffer from various problems in practical use.
DISCLOSURE OF INVENTION
Thus the present inventors made an extensive study to improve impact resistance of polycarbonate obtained by the above conventional processes. In the course of the study, it has been found that in order to improve impact resistance of these branched polycarbonate, it is effective to decrease acetone-soluble matter therein.
An object of the present invention provides polycarbonates excellent in impact resistance.
Another object of the present invention provides polycarbonates suitable for molding, particularly for bow molding.
Another object of the present invention provides a process for efficiently producing the above polycarbonates.
As a result of further investigation from such points of view, it has been found that branched polycarbonates having a branched nucleus structure as derived form a specified compound having at least three functional groups and controlled in an amount of acetone-soluble matter to not more than 3.5% can solve the above subjects, and that the desired branched polycarbonates can be efficiently produced by first reacting in a turbulent flow condition a reaction mixture containing a compound having at least three functional groups as a starting material component, and then adding an aqueous alkali solution and continuing the reaction in a laminar flow condition.
The present invention has been completed based on the above findings.
That is, the present invention provides branched polycarbonates characterized by having a branched nucleus structure as derived form at least one compound of (1) .alpha.,.alpha.',.alpha."-tris(4-hydroxyphenyl)-1,3,5-triisopropylbenzene, (2) 1-[.alpha.-methyl-.alpha.-(4'-hydroxyphenyl)ethyl-4-[.alpha.',.alpha.'-bis (4"-hydroxyphenyl)-ethyl benzene, (3) phloroglucinol and (4) trimellitic acid, having a viscosity average molecular weight of 15,000 to 40,000, and having an acetone-soluble matter of not more than 3.5% by weight.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a nuclear magnetic resonance (NMR) spectrum of the branched polycarbonate obtained in Example 1.
BEST MODE FOR CARRYING OUT THE INVENTION
The branched polycarbonates of the present invention have, as described above, a branched nucleus structure derived from one or two or more compounds of (1) to (4). A poly-carbonate having a branched nucleus structure derived from (1) .alpha.,.alpha.',.alpha."-tris(4-hydroxyphenyl)-1,3,5-triisopropylbenzene is a polycarbonate represented by the formula: ##STR1## (wherein PC represents a polycarbonate chain, and m, n and o represent integers). When, in production of the above polycarbonate chain, bisphenol A, for example, is used, PC in the above formula is represented by the formula: ##STR2##
A polycarbonate of the present invention, having a branched nucleus structure derived from (2) 1-[.alpha.-methyl-.alpha.-(4'-hydroxyphenyl)ethyl]-4-[.alpha.',.alpha.',-b is(4"-hydroxyphenyl)ethyl]benzene is represented by the following formula: ##STR3## (wherein PC, m, n and o are the same as described above).
Moreover, a polycarbonate of the present invention, having a branched nucleus structure derived from (3) fluoroglycine, when indicated in a concrete manner, is represented by the following formula: ##STR4## (wherein PC, m, n an
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patent: 4631334 (1986-12-01), Masumoto et al.
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Anderson Harold D.
Idemitsu Petrochemical Co. Ltd.
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