Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1994-11-21
1996-08-27
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528180, 528182, 528194, 528195, 528196, 528202, 528260, C08G 6300
Patent
active
055502059
ABSTRACT:
To provide novel polycarbonates and a manufacturing method for them.
Copolycarbonates obtained by copolymerizing at least two aromatic dihydroxy compounds and a compound capable of introducing carbonate links. Preferably, they contain, as the components derived from the aromatic dihydroxy compounds, constituent units described by formulas [I] and [II] in proportions of from 8.times.10.sup.-5 to 3.times.10.sup.-2 moles of [II] per mole of [I], and preferably they have a limiting viscosity number [.eta.] of from 0.2 to 1.2 dL/g, as measured in methylene chloride at 20.degree. C. ##STR1## (X, Y,: Alkylene, cycloalkylene, --O--, --S--, --SO--, OR --SO.sub.2 --. R.sup.1, R.sup.2, R.sup.7, R.sup.8 : hydrocarbon group with from 1 to 10 carbon atoms which may be substituted with halogen; or a halogen atom. m, n, p: Integers ranging from 0 to 4, indicating the number of substituents. q: Integer ranging from 0 to 3, indicating the number of substituents. R.sup.6 : Straight-chain, branched, or cyclic hydrocarbon group with from 1 to 20 carbon atoms which may be substituted with hydrogen atoms or halogen; or a halogen atom).
Manufacturing method for said copolycarbonates in which the aromatic dihydroxy compounds and carbonic acid diesters are melt-polycondensed in the presence of an alkali metal or alkaline earth metal catalyst.
The copolycarbonates of the invention have excellent melt elasticity and melt strength as well as excellent hue, heat resistance, moisture resistance, and transparency.
REFERENCES:
patent: 4628081 (1986-12-01), Mark et al.
Nagai Takashi
Sakashita Takeshi
Shimoda Tomoaki
Foelak Morton
General Electric Company
Jones Richard
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