Thermotropic polymers containing 2,5-dicarboxythiophene units
AssigneeHoechst Celanese Corporation
InventorWilfried Hatke
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Abstract
A new class of thermotropic liquid crystalline polymers comprises monomers units I, II, III, and IV, where ##STR1## Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each independently selected from the group consisting of 1,3-phenylene, 1,4-phenylene, 2,6-naphthylene, 2,7-naphthylene, 4,4'-biphenylene, bis-aryl moieties having the formula ##STR2## and mixtures thereof. In the bis-aryl moieties, each X can be S, O, CO, SO, SO.sub.2, C(CH.sub.3).sub.2 or C(CF.sub.3).sub.2.
Claims25
A thermotropic aromatic polymer comprising monomer units I, II, III, and IV, where ##STR6## wherein Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each selected from the group consisting of 1,3-phenylene, 1,4-phenylene, 2,6-naphthylene, 2,7-naphthylene, 4,4'-biphenylene, bis-aryl moieties having the structure ##STR7## and mixtures thereof, where each X is independently selected from the group consisting of S, O, CO, SO, SO.sub.2, C(CH.sub.3).sub.2 and C(CF.sub.3).sub.2 ;
- wherein said bis-aryl moleties comprise less than about 50% of the total number of moles of said Ar.sup.1, Ar.sup.2 and Ar.sup.3 ;
- wherein one or more of the hydrogen atoms on said aromatic moleties Ar.sup.1, Ar.sup.2, and Ar.sup.3 may optionally be replaced with substituents independently selected from the group consisting of Br, F, CI, I, phenyl, tolyl, and alkyl and fluoroalkyl groups having the formula C.sub.n H.sub.x F.sub.y, where n is an integer from 1 to 4, x and y are integers from 0 to 2n+1, and the sum of x and y is 2n+1;
- wherein said polymer comprises on a mole basis about 2% to about 45% of monomer unit I, about 0% to about 40% of monomer unit II, about 5% to about 47% of monomer unit III, and about 6% to about 90% of monomer unit IV;
- and
- wherein the combined amount of monomer units I and II is about equal to the amount of monomer unit III.
A method of making a melt processable thermotropic liquid crystalline polymer comprising the step of heating monomers I', II', III', and IV', or reactive derivatives thereof, to a temperature high enough to condense said monomers to yield a polymer, where ##STR8## where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each selected from the group consisting of 1,3-phenylene, 1,4-phenylene, 2,6-naphthylene, 2,7-naphthylene, 4,4'-biphenylene, bis-aryl moieties having the structure ##STR9## and mixtures thereof, where each X is independently selected from the group consisting of S, O, CO, SO, SO.sub.2, C(CH.sub.3).sub.2 and C(CF.sub.3).sub.2 ;
- wherein said bis-aryl moieties comprise less than about 50% of the total number of moles of said Ar.sup.1, Ar.sup.2, and Ar.sup.3 ;
- wherein one or more of the hydrogen atoms in said aromatic moieties Ar.sup.1, Ar.sup.2, and Ar.sup.3 may optionally be replaced with substituents independently selected from the group consisting of Br, F, Cl, I, phenyl, tolyl, and alkyl and fluoroalkyl groups having the formula C.sub.n H.sub.x F.sub.y, where n is an integer from 1 to 4, x and y are integers from 0 to 2n+1, and the sum of x and y is 2n+1;
- wherein the amounts of said monomers I', II', III', and IV' as a mole % of the combined number of moles of said monomers I', II', III', and IV' are about 2% to about 45% of monomer I', about 0% to about 40% of monomer II', about 5% to about 47% of monomer III', and about 6% to about 90% of monomer IV';
- and
- wherein the combined amount of said monomers I' and II' is about equal to the amount of said monomer III', on a mole basis.
A method for making a melt processable thermotropic liquid crystalline polymer comprising the step of stirring the acid chloride of monomers I', II', and IV' with monomer III' to yield a polymer by interfacial polymerization, where ##STR10## where Ar.sup.1, Ar.sup.2 and Ar.sup.3 are each selected from the group consisting of 1,3-phenylene, 1,4-phenylene, 2,6-naphthylene, 2,7-naphthylene, 4,4'-biphenylene, bis-aryl moieties having the structure ##STR11## and mixtures thereof, where each X is independently selected from the group consisting of S, O, CO, SO, SO.sub.2, C(CH.sub.3).sub.2 and C(CF.sub.3).sub.2 ;
- wherein said bis-aryl moieties comprise less than about 50% of the total number of moles of said Ar.sup.1, Ar.sup.2, and Ar.sup.3 ;
- wherein one or more of the hydrogen atoms in said aromatic moieties Ar.sup.1, Ar.sup.2, and Ar.sup.3 may optionally be replaced with substituents independently selected from the group consisting of Br, F, Cl, I, phenyl, tolyl, and alkyl and fluoroalkyl groups having the formula C.sub.n H.sub.x F.sub.y, where n is an integer from 1 to 4, x and y are integers from 0 to 2n+1, and the sum of x and y is 2n+1;
- wherein the amounts of said monomers I', II', III', and IV' as a mole % of the combined number of moles of said monomers I', II', III', and IV' are about 2% to about 45% of monomer I', about 0% to about 40% of monomer II', about 5% to about 47% of monomer III', and about 6% to about 90% of monomer IV';
- and
- wherein the combined amount of said monomers I' and II' is about equal to the amount of said monomer III', on a mole basis.
Dependencies are inferred from the claim text.