Liquid crystal polyester resin composition improved in fluidity

• US 5,352,746 A
• Filed: 03/30/1992
• Issued: 10/04/1994
• Est. Priority Date: 05/11/1989
• Status: Expired due to Term

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Nitta, Itaru, Asai, Kuniaki
• Primary Examiner(s): Short, Patricia A.
• Application Number:
  US07/860,558
• Time in Patent Office: 918 Days
• Field of Search: 525/437, 525/444, 525/450
• US Class Current: 525/444
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides

Abstract

A liquid crystal polyester resin composition improved in fluidity which comprises 100 parts by weight of liquid crystal polyester and 0.5-10 parts by weight of an oligomer comprising a repeating structural unit of the formula ##STR1## as the main component and having a flow temperature determined by a specified method which is in the range of 160°-350° C. and is at least 20° C. lower than the flow temperature of the liquid crystal polyester to be combined therewith.

Claims

1. A liquid crystal polyester resin composition improved in fluidity which comprisesparts by weight of a liquid crystal polyester, and

0.5-10 parts by weight of an oligomer of which number average polymerization degree determined from the amount of distilled-out acetic acid is 2.6-8.0, the oligomer having a carboxyl group at one terminal end and a hydroxyl group at the other terminal end, showing optical anisotropy in the molten state, comprising a repeating structure of the formula ##STR22## and having a flow temperature which is in the range of 160°

-350°

C. and is at least 20°

C. lower than the flow temperature of the liquid crystal polyester to be combined therewith,

said flow temperature being the temperature at which a heat-molten polymer or oligomer shows a melt viscosity of 48,000 poises when extruded through a nozzle by using a capillary rheometer fitted with a nozzle 1 mm in inner diameter and 10 mm in length at a temperature-increasing rate of 4°

C./minute.

2. A liquid crystal polyester resin composition improved in fluidity which comprisesparts by weight of a liquid crystal polyester, and

0.5-10 parts by weight of an oligomer which is a copolymer oligomer prepared from p-hydroxybenzoic acid, an aromatic dicarboxylic acid and an aromatic diol, of which number average polymerization degree determined from the amount of distilled-out acetic acid is 2.6-8.0, the oligomer having a carboxyl group at one terminal end and a hydroxyl group at the other terminal end, showing optical anisotropy in the molten state, comprising a repeating structure of the formula ##STR23## and having a flow temperature which is in the range of 160°

-350°

C. and is at least 20°

C. lower than the flow temperature of the liquid crystal polyester to be combined therewith,

said flow temperature being the temperature at which a heat-molten polymer or oligomer shows a melt viscosity of 48.000 poises when extruded through a nozzle by using a capillary rheometer fitted with a nozzle 1 mm in inner diameter and 10 mm in length at a temperature-increasing rate of 4°

C./minute.

3. A liquid crystal polyester resin composition improved in fluidity which comprisesparts by weight of a liquid crystal polyester, and

0.5-10 parts by weight of an oligomer which is a copolymer oligomer prepared from p-hydroxybenzoic acid, an aromatic dicarboxylic acid which is at least one member selected from the group consisting of terephthalic acid and isophthalic acid, and an aromatic diol, of which number average polymerization degree determined from the amount of distilled-out acetic acid is 2.6-8.0, the oligomer having a carboxyl group at one terminal end and a hydroxyl group at the other terminal end, showing optical anisotropy in the molten state, comprising a repeating structure of the formula ##STR24## and having a flow temperature which is in the range of 160°

-350°

C. and is at least 20°

C. lower than the flow temperature of the liquid crystal polyester to be combined therewith,

said flow temperature being the temperature at which a heat-molten polymer or oligomer shows a melt viscosity of 48,000 poises when extruded through a nozzle by using a capillary rheometer fitted with a nozzle 1 mm in inner diameter and 10 mm in length at a temperature-increasing rate of 4°

C./minute.

4. A liquid crystal polyester resin composition improved in fluidity which comprisesparts by weight of a liquid crystal polyester, and

0.5-10 parts by weight of an oligomer which is a copolymer oligomer prepared from p-hydroxybenzoic acid, an aromatic dicarboxylic acid and an aromatic diol which is at least one member selected from the group consisting of hydroquinone, resorcinol and 4,4'"'"'-dihydroxydiphenyl, of which number average polymerization degree determined from the amount of distilled-out acetic acid is 2.6-8.0, the oligomer having a carboxyl group at one terminal end and a hydroxyl group at the other terminal end, showing optical anisotropy in the molten state, comprising repeating structure of the formula ##STR25## and having a flow temperature which is in the range of 160°

-350°

C. and is at least 20°

C. lower than the flow temperature of the liquid crystal polyester to be combined therewith,

said flow temperature being the temperature at which a heat-molten polymer or oligomer shows a melt viscosity of 48,000 poises when extruded through a nozzle by using a capillary rheometer fitted with a nozzle 1 mm in inner diameter and 10 mm in length at a temperature-increasing rate of 4°

C./minute.