Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1992-09-11
1993-09-07
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528196, 528202, 528204, C08G 6414
Patent
active
052430189
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel branched polycarbonate and more specifically to a novel branched polycarbonate having excellent flame retardancy, mechanical strength and melt properties suitable for blow molding.
BACKGROUND ART
Conventionally, there have been known halogen-containing, flame retardant copolymerized polycarbonates disclosed in Japanese Patent Publication Nos. 40715/1971 and 24660/1972 and Japanese Patent Application Laid-Open Nos. 123294/1976, 136796/1976, 140597/1977, 50065/1979, 99226/1981 and the like. However, these polycarbonates have been found not to have satisfactory properties for an industrial use, with respect to flame retardancy, mechanical strength and melt properties suitable for blow molding.
It has been known that branched polycarbonates with the improved flame retardancy are provided according to a method in which alkali metal salts of inorganic mineral acid, organic carboxylic aid or sulfonic acid are added thereto (as disclosed in Japanese Patent Publication No. 51497/1985) and a method in which flame retardant monomers, for example tetrabromobisphenol A, are copolymerized therewith (as disclosed in Japanese Patent Publication No. 12132/1980). However, the mechanical strength achieved by the former method has not been sufficiently high because of the contamination associated with the additives, while that of the latter method has been improved due to a branching agent contained therein but still not good enough for use in the industrial production.
Thus, the present inventors have made extensive studies with a view to developing a novel polycarbonate which is excellent in flame retardancy, mechanical properties and melt properties suitable for blow molding.
DISCLOSURE OF INVENTION
As the result, it has been found that above problems can find a solution with a new polycarbonate in a branched shape, having a branched structure derived from a specific branching agent and further a trihalogenophenoxy group situated at the terminal thereof. The present invention has been completed based on this finding. Therefore, the present invention provides a branched polycarbonate which comprises a branched structure derived from a branching agent represented by the following general formula (A): ##STR3## wherein R is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms and R.sup.1 to R.sup.6 each are a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or a halogen atom, a repeating unit (I) represented by the following general formula: ##STR4## a repeating unit (II) represented by the following general formula: ##STR5## wherein X.sup.1 to X.sup.4 each are a halogen atom and a trihalogenophenoxy group represented by the following general formula (III): ##STR6## wherein X.sup.5 to X.sup.7 each are a halogen atom, as bonded to the terminal thereof, said branched polycarbonate having a viscosity average molecular weight of 10,000 to 50,000, a ratio of said branched structure of 0.1 to 2.0 mol % and a content of said repeating unit (II) of 10 mol % or less.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a chart showing a proton nuclear magnetic resonance (.sup.1 H-NMR) spectrum of the branched polycarbonate obtained in Example 1.
FIG. 2 is a chart showing an infrared absorption (IR) spectrum of the branched polycarbonate obtained in Example 1.
BEST MODE FOR CARRYING OUT THE INVENTION
As stated above, a branched polycarbonate of the present invention comprises a branched structure derived from a branching agent represented by the following general formula (A): ##STR7## In this general formula, R is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, for example a methyl group, an ethyl group, a n-propyl group, a n-butyl group, a n-pentyl group and the like. R.sup.1 to R.sup.6 each are a hydrogen atom, an alkyl group having 1 to 5 carbon atoms (for example, methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group and the like) or a halogen atom (for example, chlorine atom, bromine atom, fluorine atom and the like). Specific
REFERENCES:
patent: 4413103 (1983-11-01), Katsuhisa et al.
patent: 4831100 (1989-05-01), Komatsu et al.
patent: 4888400 (1989-12-01), Boden et al.
patent: 5185425 (1993-02-01), Komatsu
Komatsu Takashi
Kuze Shigeki
Anderson Harold D.
Idemitsu Petrochemical Co. Ltd.
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