Process for producing liquid crystal polymer
AssigneeTicona LLC
InventorsH. Clay Linstid, III, Vincent J. Provino
Life of this patent
Estimating the term…
Abstract
A potassium catalyst is used in combination with a cobalt catalyst to increase the reaction rate and/or reduce the reaction temperature of a melt polymerization process for producing an anisotropic melt-phase forming polymer derived from p-hydroxybenzoic acid, 6-hydroxy-2-naphthoic acid, aromatic hydroxycarboxylic acid, aromatic diol, at least a portion of which is resorcinol and at least one aromatic dicarboxylic acid, compared to a like process wherein either catalyst is used alone.
Claims11
A process for preparing an anisotropic melt-phase forming polymer consisting essentially of recurring units I, II, III, IV and V, wherein:
- recurring unit I is:
- ##STR15## recurring unit II is:
- ##STR16## recurring unit III is:
- --O--Ar.sup.1 --O--
- wherein Ar.sup.1 is a divalent radical selected from the group consisting of:
- ##STR17## and mixtures thereof, recurring unit IV is:
- ##STR18## wherein Ar.sup.2 is selected from the group consisting of:
- ##STR19## and mixtures thereof, and recurring unit V is:
- ##STR20## which process comprises reacting the aromatic diacid from which recurring unit IV is derived and acetate form of the reactants from which recurring units I, II, III and V are derived in the presence of a catalytic amount of a catalyst system comprising a potassium catalyst in combination with a cobalt catalyst.
A process for producing a polymer consisting essentially of recurring units of the formula:
- ##STR21## which comprises which comprises the steps of:
- (a) heating a polymerization mixture comprising the aromatic diacid and acetate form of the reactants from which said recurring units are derived in the presence of a catalyst comprising from about 40 to about 80 ppm of potassium catalyst, as metal ion per theoretical weight of polymer and from about 40 to about 80 ppm of cobalt catalyst, as metal ion per theoretical weight of polymer, to a temperature sufficient to induce polymerization at a rate which avoids sublimation of the acetates or the oligomeric products initially produced;
- and
- (b) maintaining the mixture at polymerization temperature for a period of time sufficient to produce a polymer of desired melt viscosity.
Dependencies are inferred from the claim text.