Liquid crystalline polyester and method for producing thereof
First Claim
1. A method for producing a liquid crystalline polyester comprising copolymerizing a 4-acyloxybenzoic acid of Formula (I):
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(wherein R1 represents an alkyl group of 1 to 5 carbon atoms),and a 2-acyloxy-6-naphthoic acid of Formula (II);
(wherein R2 is an alkyl group of 1 to 5 carbon atoms),in the presence of imidazoles of Formula (V);
(wherein X1 to X4 represent a hydrogen atom, or each independently represents an alkyl group, hydroxymethyl group, cyanoalkyl group, carboxyl group, aminoalkyl group, phenyl group, benzyl group or formyl group).
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Abstract
The present invention provide a liquid crystalline polyester that can be used in production of a molded article having sufficient mechanical strengths in which the melted liquid crystalline polyester has sufficient fluidity in thin-walled portions when the thin-walled molded article is manufactured, and to provide a method for producing the liquid crystalline polyester. A liquid crystalline polyester obtained by copolymerizing 4-acyloxybenzoic acids (I) and 2-acyloxy-6-naphthoic acids (II) in the presence of an imidazole (V) can be used in production of a molded article in which the melted liquid crystalline polyester has sufficient fluidity in thin-walled portions when the thin-walled molded article is manufactured, and which has sufficient mechanical strengths as well, thereby completing the present invention. Further, a liquid crystalline polyester obtained by copolymerizing 4-acyloxybenzoic acids (I), 2-acyloxy-6-naphthoic acids (II), 4,4′-diacyloxybiphenyls (III) and phthalic acids (IV) in the presence of an imidazole (V) can be used in production of a molded article in which the melted liquid crystalline polyester has sufficient fluidity in thin-walled portions when the thin-walled molded article is manufactured, and which has sufficient mechanical strengths as well, thereby completing the present invention.
40 Citations
7 Claims
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1. A method for producing a liquid crystalline polyester comprising copolymerizing a 4-acyloxybenzoic acid of Formula (I):
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(wherein R1 represents an alkyl group of 1 to 5 carbon atoms), and a 2-acyloxy-6-naphthoic acid of Formula (II);
(wherein R2 is an alkyl group of 1 to 5 carbon atoms), in the presence of imidazoles of Formula (V);
(wherein X1 to X4 represent a hydrogen atom, or each independently represents an alkyl group, hydroxymethyl group, cyanoalkyl group, carboxyl group, aminoalkyl group, phenyl group, benzyl group or formyl group). - View Dependent Claims (3, 4, 6, 7)
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2. The method for producing a liquid crystalline polyester comprising copolymerizing 4-acyloxybenzoic acid of the Formula (I), 2-acyloxy-6-naphthoic acid of the Formula (II), a 4,4′
- -diacyloxybiphenyl of Formula (III);
(wherein R3 and R4 represent independently alkyl groups of 1 to 5 carbon atoms), and a phthalic acid of Formula (IV);
in the presence of imidazoles of Formula (V);
(wherein X1 to X4 represent a hydrogen atom, or each independently represents an alkyl group, hydroxymethyl group, cyanoalkyl group, carboxyl group, aminoalkyl, phenyl group, benzyl group or formyl group). - View Dependent Claims (5)
- -diacyloxybiphenyl of Formula (III);
Specification
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- Resources
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Current AssigneeSumitomo Chemical Company Limited
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Original AssigneeSumitomo Chemical Company Limited
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InventorsOotomo, Shinji, Okamoto, Satoshi, Hirakawa, Manabu
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Primary Examiner(s)WU, SHEAN CHIU
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Application NumberUS10/289,330Publication NumberTime in Patent Office600 DaysField of Search252/299.01, 252/299.62, 252/299.64, 252/299.66, 252/299.67, 528/190, 528/194, 528/302, 528/308US Class Current252/299.67CPC Class CodesC08G 63/065 the hydroxy and carboxylic ...C08G 63/605 the hydroxy and carboxylic ...C08G 63/87 Non-metals or inter-compoun...
