Wholly aromatic polyester carbonate and process for production of same
AssigneeTeijin Limited
InventorsHiroshi Sakurai, Toyoaki Ishiwata, Shunichi Matsumura, Masayuki Chokai
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Abstract
The present invention relates to a wholly aromatic polyester carbonate and a process for its production. An aromatic dicarboxylic acid, an aromatic diol, and a diaryl carbonate are used as starting materials in specific molar ratios, a prepolymerization step, a crystallization step, and a solid-phase polymerization step are essential steps, and a compression molding step is an optional step. This makes it possible to produce with good productivity a wholly aromatic polyester carbonate that has low coloration and a high degree of polymerization.
Claims40
A process for the production of a wholly aromatic polyester carbonate using three components, that is, an aromatic diol component (a) represented by formula (I) below
- HO—Ar1—X—Ar2—OH (I)
- {in formula (I), Ar1 and Ar2 are each phenylene groups, which may be substituted, and X is a divalent organic group represented by formula (II) below
- 8
- (here, R1, R2, R3, and R4 are each independently chosen from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbons, a cycloalkyl group having 5 or 6 carbons, an aryl group having 6 to 12 carbons, and an aralkyl group having 7 to 12 carbons, q denotes an integer of 4 to 10, and q each of R3 and R4 may be identical or different)}, an aromatic dicarboxylic acid component (b), and a diaryl carbonate (c) in molar ratios that simultaneously satisfy expressions (1), (2), and (3) below
- A:B:C=(1+X1):1:(2+X2) (1) 0.9≦C/(A+B)≦1.1 (2) 0.5≦X2/X1≦1.5 (3)
- (in the expressions, A denotes the number of moles of the aromatic diol component (a), B denotes the number of moles of the aromatic dicarboxylic acid component (b), and C denotes the number of moles of the diaryl carbonate (c);
- X1 and X2 denote any number that is larger than 0 and at most 0.5, and may be identical or different), characterized in that a high molecular weight polymer is obtained by carrying out, in sequence,
- 1) a prepolymerization step in which a prepolymer is prepared by prepolymerizing the three components, that is, the above-mentioned aromatic diol component (a), the aromatic dicarboxylic acid component (b), and the diaryl carbonate (c) while heating at a temperature of at least 180° C. using, as the aromatic dicarboxylic acid component (b), terephthalic acid (b′) alone or an aromatic dicarboxylic acid component mixture (b″) of terephthalic acid and isophthalic acid at a molar ratio that satisfies expression (4) below
- 0≦IA/TA<1 (4)
- (in the expression, TA and IA are the numbers of moles of terephthalic acid and isophthalic acid, respectively),
- 2) a crystallization step in which the prepolymer is crystallized to prepare a crystallized prepolymer, and
- 3) a solid-phase polymerization step in which the degree of polymerization of the crystallized prepolymer is increased.
A wholly aromatic polyester carbonate characterized in that a repeating unit represented by formula (V) below
- A—(CO—Ar3—COO—Ar1—X—Ar2—O)100—(COO—Ar1—X—Ar2—O)100X3B (V)
- {in formula (V), Ar1 and Ar2 are each phenylene groups, which may be substituted, Ar3 is an aromatic group, which may be substituted, X is a divalent organic group represented by formula (II) below
- 10
- (here, R1, R2, R3, and R4 are each independently chosen from the group consisting of a hydrogen atom, a halogen atom, an alkyl group having 1 to 6 carbons, a cycloalkyl group having 5 or 6 carbons, an aryl group having 6 to 12 carbons, and an aralkyl group having 7 to 12 carbons, q denotes an integer of 4 to 10, and q each of R3 and R4 may be identical or different), and X3 is a number greater than 0 and at most 0.5}, is random copolymerized, and terminal groups A and B of the molecule are groups chosen from the group consisting of an aryloxy group, which may be substituted with a halogen atom or a methyl group, a hydroxyaryl group, which may have a substituent, and a carboxyaryl group, which may be substituted.
Dependencies are inferred from the claim text.