Liquid-crystalline polyester production method

Details Liquid-crystalline polyester production method Liquid-crystalline polyester production method

2006-02-28

2006-02-28

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S176000, C528S193000, C528S271000, C528S272000

Reexamination Certificate

active

07005497

ABSTRACT:
A liquid-crystalline polyester production method with a shortened reaction time and improved productivity per unit time by using an organic basic compound containing one nitrogen atom in a molecule is achieved by a liquid-crystalline polyester production method comprising carrying out acylation reaction and/or ester-exchange in the presence of an organic basic compound containing one nitrogen atom in one molecule and satisfying the following inequality (1):in-line-formulae description="In-line Formulae" end="lead"?0<A+0.4×B  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein, A and B satisfy A={(Ech+−Ec)/(Eph+−Ep)}−1 and B=(φf/φfp)−1;Ec denotes the heat of formation of the organic basic compound; Ech+denotes the heat of formation of a compound coordinated by proton; Ep denotes the heat of formation of pyridine; and Eph+denotes the heat of formation of pyridine coordinated by proton to the nitrogen atom; φf and φfp independently denote parameters relevant to the steric angles.

REFERENCES:
patent: 2002/0055607 (2002-05-01), Okamoto et al.
patent: 0 373 592 (1990-06-01), None
patent: 06-001836 (1994-01-01), None
patent: 2002-146003 (2002-05-01), None
Wolfgang Stadbauer, et al. “Palladium-katalysierte Ringschlubreaktionen zu Benzofuranen: ein neuer and effektiver Zugang zu Azacumostroldervaten”, Liebigs Ann. Chem. 1990, pp. 531-539.
Scott C. Berk, et al. “Preparation and Reactions of Functionalized Benzylic Organometallics of Zinc and Copper”, Organometallics, 1990, 9, pp. 3053-3064, American Chemical Society.
Cheuk K. Lau, et al. “Synthesis and Structure-Activity Relationships of a Novel Class of 5-Lipoxygenase Inhibitors, 2-(Phenylmethyl)-4-hydroxy-3,5-dialkylbenzofurans: The Development of L-656,224”, J. Med. Chem., 1989, 32 pp. 1190-1197, American Chemical Society.

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