Peggy J Birch

US Patent:

60937874, Jul 25, 2000

Filed:

Apr 9, 1998

Appl. No.:

9/058015

Inventors:

Timothy Edward Long - Blountville TN
Peggy Spears Birch - Kingsport TN
James Rodney Bradley - Kingsport TN

Assignee:

Eastman Chemical Company - Kingsport TN

International Classification:

C08G 6400

US Classification:

528272

Abstract:

Disclosed is a select class of liquid crystalline polyesters and molding compositions comprising the polyesters and glass fiber. The liquid crystalline polyesters consist essentially of (1) diacid residues consisting essentially of (i) cyclohexanedicarboxylic acid residues and (ii) other diacid residues selected from terephthalic acid residues, 2,6-naphthalenedicarboxylic acid residues, or a mixture thereof; (2) diol residues consisting essentially of hydroquinone residues, 4,4'-biphenol residues or a mixture thereof; and, optionally, (3) p-hydroxybenzoic acid residues. In the above definition, the moles of diol residues are equal to the moles of diacid residues and the total of the (1), (2) and (3) mole percentages is equal to 100. The liquid crystalline polyesters have melting points determined by differential scanning calorimetry equal to or less than 375. degree. C.