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AssigneeMitsui Petrochemical Industries, Ltd.
InventorsTadao Yatsu, Takayuki Nakano, Toshiki Sotoyama
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An aromatic copolyester comprising substantially equimolar proportions of [A] units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and [B] units derived from an aromatic diol component; characterized in that (I) the diol component [B] is composed of 20 to 95 mole %, based on the total moles of compounds (a) and (b) below, of (a) a bisphenol compound represented by the formula ##STR1## wherein X represents a direct bond, or a divalent group selected from the class consisting of C.sub.1 -C.sub.8 alkylidene groups, O, S, SO, SO.sub.2 and CO, and (b) 5 to 80 mole %, based on the total moles of the compounds (a) and (b), of a compound selected from the group consisting of a specific divalent phenolic compound, and (II) the aromatic copolyester has an intrinsic viscosity [.eta.], determined at 60.degree. C. in pentafluorophenol, of at least 0.4 dl/g.
An aromatic copolyester comprising substantially equimolar proportions of (A) units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and (B) units derived from an aromatic diol mixture, wherein said units are derived by the reaction between said dicarboxylic acid or an ester-forming derivative thereof with said diol component or an ester-forming derivative thereof;
Dependencies are inferred from the claim text.
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Hydroxy compounds containing aromatic rings: containing two or more aromatic rings
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
Term ended 2 Aug 2005 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention relates to an aromatic copolyester derived from an aromatic dicarboxylic acid component and an aromatic diol component, which is not described in the known literature and has excellent heat resistance and hydrolysis resistance.
More specifically, this invention relates to an aromatic copolyester comprising substantially equimolar proportions of [A] units derived from an aromatic dicarboxylic acid having 8 to 16 carbon atoms, and [B] units derived from an aromatic diol component; characterized in that
(I) the diol component [B] is composed of 20 to 95 mole%, based on the total moles of compounds (a) and (b) below, of
A reactor was charged with 83 parts of terephthalic acid, 83 parts of isophthalic acid, 156 parts of 2,2-bis(4-acetoxyphenyl)propane, 243 parts of 1,4-bis(3,5-dimethyl-4-acetoxycumyl)benzene, 0.33 part of triphenyl phosphate and 0.1 part of tetrabutoxy titanate, and they were reacted at 250.degree. at 270.degree. C. under atmospheric pressure for about 2 hours with stirring in an atmosphere of nitrogen while distilling off acetic acid formed. Furthermore, over the course of about 2 hours, the pressure of the reaction system was gradually reduced, and its temperature was raised so that finally the pressure reached 0.7 mmHg and the temperature rose to 350.degree. C. The resulting aromatic polyester had an intrinsic viscosity [.eta.] of 0.75 dl/g, a glass transition temperature of 232.degree. C., and a hydrolysis resistance of as high as 96%.
Example 1 was repeated except that 1,4-bis(3,5-dimethyl-4-acetoxycumyl)benzene was not used but 312 parts of 2,2-bis(4-acetoxyphenyl)propane was used. The resulting aromatic copolyesters had an intrinsic viscosity [.eta.] of 0.68 dl/g, a glass transition temperature of 186.degree. C., and a hydrolysis resistance of 48%.
Example 1 was repeated except that the aromatic dicarboxylic acids, aromatic binuclear bisphenol diacetates and aromatic trinuclear bisphenol diacetates indicated in Table 1 were used in the proportions indicated. The intrinsic viscosities, glass transition temperatures and hydrolysis resistances of the resulting aromatic polyesters are summarized in Table 1.