Patent ID: 7175779

Claim:
A thermotropic main-chain liquid crystalline homo- or copolymer forming a liquid crystalline phase, having therein an aromatic monomer with at least one functional group in ortho-position, said polymer is produced by the transesterification of a polyester selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate), poly(ethylene naphthalate), poly(butylene naphthalate), poly(trimethylene terephthalate), poly(trimethylene naphthalate), poly(cyclohexane dimethanolterephthalate) and/or poly(cyclohexane dimethanolnaphthalate) and having entanglements, increased melt strength and isotropic and anisotropic properties, said aromatic monomer being selected from the group consisting of at least one of acetylsalicylic acid, diacetylated catechol, or a derivative thereof.