Anisotropic melt-forming copolycarbonate from 4,4'-dihydroxy bip

Details Anisotropic melt-forming copolycarbonate from 4,4'-dihydroxy bip Anisotropic melt-forming copolycarbonate from 4,4'-dihydroxy bip

1988-06-28

1989-05-16

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

528196, C08G 6362

Patent

active

048311057

ABSTRACT:
Polycarbonates are provided exhibiting anisotropic properties in the melt. Transesterification of diphenylcarbonate is effected in the melt with a mixture of methylhydroquinone and 4,4'-dihydroxybiphenyl. The polycarbonates are found to be insoluble in several common solvents such as chloroform, methylenechloride, and toluene.

REFERENCES:
patent: 3250744 (1966-05-01), Schnell et al.
patent: 4543313 (1985-09-01), Mahabadi et al.
European Polymer Journal, vol. 15, Roviello et al., "Mesophasic Behaviour of Some Polycarbonates of 4,4'Dihydroxy-.alpha.,.alpha.'-Dimethylbenzalazine", (1979), pp. 423-430.
Makromol. Chem., Rapid Commun., Sato et al., "New Liquid-Crystalline Polycarbonates from Diols Containing a Biphenyl Ring Sequence as Central Core", (1986), pp. 231-234.

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