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US 8,044,151 B2Granted
Wholly aromatic liquid-crystalline polyester
AssigneeUeno Fine Chemicals Industry, Ltd.
InventorsMotoki Asahara, Hiroaki Terada, Hiroyuki Kato
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AssigneeUeno Fine Chemicals Industry, Ltd.
InventorsMotoki Asahara, Hiroaki Terada, Hiroyuki Kato
Estimating the term…
The present invention provides a wholly aromatic liquid-crystalline polyester consisting of the repeating units represented by formulae (I), (II), (III) and (IV): wherein: the molar proportion of the repeating unit represented by formula (I) based on the total repeating units constituting the wholly aromatic liquid-crystalline polyester is 40-80 mol %; the molar ratio of the total amount of the repeating units represented by formulae (II) and (III) to the repeating unit represented by formula (IV) is from 90/100 to 100/90; the molar proportion of the repeating unit represented by formula (II) based on the total amount of the repeating units represented by formulae (II) and (III) is 80-99.9 mol%; and the two “—O—” attached to the benzene ring in formula (III) are positioned meta or para to each other and “Ar” in formula (IV) represents a bivalent aromatic group. The wholly aromatic liquid-crystalline polyester of the present invention exhibits excellent dielectric properties in high frequency regions as well as good mechanical properties such as impact strength.
A wholly aromatic liquid-crystalline polyester consisting of the repeating units represented by formulae (I), (II), (III) and (IV):
A wholly aromatic liquid-crystalline polyester composition comprising 100 parts by weight of the wholly aromatic liquid-crystalline polyester according to claims 1 and 0.1-200 parts by weight of at least one inorganic and/or organic filler.
Dependencies are inferred from the claim text.
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Derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds: the hydroxy and carboxylic…
With mesogenic groups in the main chain: polyesters; Polyester derivatives, e.g. polyamides
Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used: used in the High…
Macromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds
About 2 years 8 months of term left · ends 2 Jul 2029 (estimated)
The present invention relates to a wholly aromatic liquid-crystalline polyester which exhibits good mechanical properties and excellent dielectric properties in high frequency regions.
In modern societies, multimedia in daily life is rapidly developing and ITS (Intelligent Transport Systems) such as ETC device used in toll roads and GPS becomes widely used. In order to treat the extraordinary increase of information and telecommunications technologies, the frequency of signals used for the transmission is becoming higher.
As material used for the information communication devices employing such a high frequency, engineering plastics which exhibit excellent dielectric properties in high frequency regions (especially in gigahertz bands) attract attention. The engineering plastics also exhibit good productivities and lightweight properties and therefore, they are expected to be applied for chassis and package of communication devices and electronic devices as well as for dielectric body and the like.
FIG. 1 is a schematic representation of the dumbbell-shaped specimen used for the tensile strength test.
In the specification and claims, the term “aromatic” represents a group having an aromatic group comprising up to four rings. “Aromatic” group may be 6-membered monocyclic or polycyclic fused cyclic group. “Aromatic” group also includes a group wherein two or more 6-membered monocyclic or polycyclic fused cyclic groups are linked by at least one linking group which is selected from the group consisting of carbon-carbon bond, oxy, C1-6 alkylene, amino, carbonyl, sulfide, sulfinyl and sulfonyl group.
In the specification and claims, the term “wholly aromatic liquid-crystalline polyester” refers to a wholly aromatic liquid-crystalline polyester which exhibits anisotropic melt phase and is called as thermotropic liquid-crystalline polyester by those skilled in the art.
The anisotropic melt phase can be confirmed by means of conventional polarized light system using orthogonal light polarizer. In more detail, the sample on the hot stage under nitrogen atmosphere may be observed.