Liquid crystal polymers

US6180024A · kind A · utility

Assignee

• The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland · GB

Inventors

• Keith M Blackwood · Malvern, GB
• Michelle Jones · Malvern, GB
• David Lacey · Hope, GB
• Alan W Hall · Hope, GB
• Kenneth J. Toyne · Cudworth, GB
• Steven Derek Pringle · Darwen, GB

Key dates

• Filing date: Feb 26, 1999
• Grant date: Jan 30, 2001
• Expiry date: Feb 26, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/00
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

##STR1## Methods, based on the Wittig-Horner reaction, are provided for the synthesis of compounds of formula (I) where m is from 5-150, X and Y are independently selected from: CN, H, OH, COCH.sub.3, CO.sub.2 H, CO.sub.2 H, CO.sub.2 R.sub.1, where R.sub.1 is C.sub.1-12 alkyl, NCS, SCN, CF.sub.3, CH.sub.2 X where X is F, Cl, Br, OH, CHF.sub.2 and formula (IB), where J for each X and Y group is independently selected from: CH.sub.2, single covalent bond, OOC, CO.sub.2, O, CH.sub.2 O, OCH.sub.2, CH.sub.2 CO.sub.2, CH.sub.2 OOC; p=1-20; L for each X and Y group is independently selected from: O, CH.sub.2 OCO, CO.sub.2, S, NH; (a) is defined by formula (IC), where rings A, B and C are independently selected from phenyl, cyclohexyl, pyridine and pyrimidine and may be independently of each other substituted with at least one of Cl or F; linking groups A and B may be selected from single bond, CO.sub.2, OOC, CH.sub.2 O, OCH.sub.2, CH.sub.2 CH.sub.2, C.tbd.C; Z is selected from CN, F, Cl, NO.sub.2, R, OR, CO.sub.2 R, CF.sub.3, OOCR, NCS, SCN, where R=straight chain or branched chain alkyl and may include from 1-16 carbon atoms and including where one or more non-adjacent CH.sub.2 groups ma…