EP0081900A1 — Anisotropic polymers having improved retention of…

Claim 1

Independent Claim 91 words

An anisotropic-melt-forming polymer having improved stiffness retention at elevated temperatures comprising residues selected from residues (A) of dihydric phenols, aromatic dicarboxylic acids, hydroxyaromatic acids, aromatic diamines, aminophenols and aminoaromatic acids wherein at least 40 mole % of the residues (A) have their chain extending bonds in either coaxial or parallel and oppositely directed relationship and sufficient of non-linear residues (B) selected from at least one of: and to give a polymer having an improved retention of stiffness at elevated temperatures compared with an otherwise similar polymer not containing said residues (B).

Claim 2

Dependent Claim 91 words

An anisotropic-melt-forming polymer having improved stiffness retention at elevated temperatures comprising residues selected from residues (A) of dihydric phenols, aromatic dicarboxylic acids, hydroxyaromatic acids, aromatic diamines, aminophenols and aminoaromatic acids wherein at least 40 mole % of the residues (A) have their chain extending bonds in either coaxial or parallel and oppositely directed relationship and sufficient of non-linear residues (B) selected from at least one of: and to give a polymer having an improved retention of stiffness at elevated temperatures compared with an otherwise similar polymer not containing said residues (B).

Claim 3

Dependent Claim 21 words

An anisotropic-melt-forming polymer according to claim 1 wherein the concentration of non-linear residues (B) is between 5 and 50 mole %.

Claim 4

Dependent Claim 21 words

An anisotropic-melt-forming polymer according to claim 2 wherein the concentration of non-linear residues (B) is between 10 and 40 mole %.

Claim 5

Dependent Claim 55 words

An anisotropic-melt-forming polymer according to any one of claims 1 to 3 wherein the residues other than the non-linear residues are residues of hydroxyaromatic acids and optionally, residues of aromatic dicarboxylic acids and/or diphenols the residues other than the non-linear residues having their chain extending bonds in either coaxial or parallel and oppositely directed relationship.

Claim 6

Dependent Claim 28 words

An anisotropic-melt-forming polymer according to any one of claims 1 to 3 wherein the residues other than the non-linear residues are residues of aromatic dicarboxylic acids and diphenols.

Claim 7

Independent Claim 91 words

A method of producing an anisotropic-melt-forming polymer having improved stiffness retention at elevated temperatures comprising reacting at least 40 mole % of polyester or polyesteramide forming reactants selected from dihydric phenols, aromatic dicarboxylic acids, hydroxyaromatic acids, aromatic diamines, aminophenols and aminoaromatic acids having their chain extending bonds in either coaxial or parallel and oppositely directed relationship with sufficient non-linear reactants selected from those containing the divalent radicals: and to give a polymer of improved retention of stiffness at elevated temperatures compared with an otherwise similar polymer not containing the non-linear reactants.

Claim 8

Independent Claim 91 words

A method of producing an anisotropic-melt-forming polymer having improved stiffness retention at elevated temperatures comprising reacting at least 40 mole % of polyester or polyesteramide forming reactants selected from dihydric phenols, aromatic dicarboxylic acids, hydroxyaromatic acids, aromatic diamines, aminophenols and aminoaromatic acids having their chain extending bonds in either coaxial or parallel and oppositely directed relationship with sufficient non-linear reactants selected from those containing the divalent radicals: and to give a polymer of improved retention of stiffness at elevated temperatures compared with an otherwise similar polymer not containing the non-linear reactants.

Claim 9

Dependent Claim 124 words

A method according to claim 6 wherein the non-linear reactant containing the divalent radical: is selected from reactants of formula: and their polymerisable derivatives, where R 1 , R 2 and R 3' which may be the same or different, are selected from: and where X is a direct link or is selected from -0-, >CO, >CH 2 , >SO 2 , >C(CH 3 ) 2 or phenyl radicals, and an amino group is present in the meta position with respect to the other chain extending bond in the case of the single ring compounds and in the case of the multiple ring systems is in the meta position with respect to the outgoing bond linked to X or linked directly to the ring.

Claim 10

Dependent Claim 61 words

A method according to claim 6 wherein the non-linear -S0 2 - containing reactants are selected from reactants of formula: and where A and B may be the same or different and are selected from -OH, -NH 2 , -COOH, -Q-OH, -QNH 2 and -Q-COOH, where Q may be a phenyl radical or a radical of formula: and polymerisable derivatives thereof.

Claim 11

Independent Claim 35 words

A method according to any one of claims 6 to 8 wherein the residues other than the non-linear reactants are selected from hydroxy aromatic acids, optionally in the presence of aromatic dicarboxylic acids and/or diphenols.

Claim 12

Independent Claim 27 words

A method according to any one of claims 6 to 8 wherein the residues other than the non-linear reactants are selected from aromatic dicarboxylic acids and diphenols.

Claim 13

Dependent Claim 18 words

Shaped articles having improved stiffness retention at elevated temperatures when formed from a polymer according to claim 1.

Anisotropic polymers having improved retention of physical properties at elevated temperatures and methods of manufacture thereof

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