EP0093891A1 — Heat-resisting aromatic polyester and process for…

Claim 1

Independent Claim 153 words

An aromatic polyester comprising (a) 1 to 99 % by mole of units of the formula (I): and (b) units of the formula (II): wherein R 1 and R 2 are an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, R 3 , R 4 , R 5 and R 6 are the same or different and each is an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, chlorine atom or bromine atom, x and y are an integer of 1 to 4, z, x', y' and z' are 0 or an integer of 1 to 4, and X is a bivalent group selected from the group consisting of an alkylidene group having 1 to 8 carbon atoms, a cycloalkylidene group having 1 to 8 carbon atoms, -0-, -S-, -SO 2 - and -CO-.

Claim 2

Dependent Claim 153 words

An aromatic polyester comprising (a) 1 to 99 % by mole of units of the formula (I): and (b) units of the formula (II): wherein R 1 and R 2 are an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, R 3 , R 4 , R 5 and R 6 are the same or different and each is an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, chlorine atom or bromine atom, x and y are an integer of 1 to 4, z, x', y' and z' are 0 or an integer of 1 to 4, and X is a bivalent group selected from the group consisting of an alkylidene group having 1 to 8 carbon atoms, a cycloalkylidene group having 1 to 8 carbon atoms, -0-, -S-, -SO 2 - and -CO-.

Claim 3

Dependent Claim 45 words

The aromatic polyester of Claim 1, wherein the units (I) are those having the formula (III): wherein R is an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, and Rand z are as defined above.

Claim 4

Dependent Claim 25 words

The aromatic polyester of Claim 1, wherein the units (I) are those having the formula (IV): wherein R 3 and z are as defined above.

Claim 5

Dependent Claim 20 words

The aromatic polyester of Claim 1, wherein the intrinsic viscosity of the aromatic polyester is from 0.1 to 8 dl./g.

Claim 6

Dependent Claim 52 words

A process for preparing a heat-resisting aromatic polyester which comprises reacting a mixture of alkali metal salts of difunctional phenol compounds containing at least 1 % by mole of an alkali metal salt of 4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl with terephthaloyl chloride, isophthaloyl chloride or a mixture thereof in the presence of a phase transfer catalyst.

Claim 7

Dependent Claim 52 words

A process for preparing a heat-resisting aromatic polyester which comprises reacting a mixture of alkali metal salts of difunctional phenol compounds containing at least 1 % by mole of an alkali metal salt of 4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl with terephthaloyl chloride, isophthaloyl chloride or a mixture thereof in the presence of a phase transfer catalyst.

Claim 8

Dependent Claim 22 words

The process of Claim 5, wherein said mixture contains at least 30 0 by mole of an alkali metal salt of 4,4'-dihydroxy-3,3',5,5'-tetramethylbiphenyl.

Claim 9

Dependent Claim 32 words

The process of Claim 5, wherein said difunctional phenol compounds are employed in the form of an aqueous solution prepared by dissolving them in an aqueous solution of potassium or sodium hydroxide.

Claim 10

Dependent Claim 28 words

The process of Claim 5, wherein said phase transfer catalyst is a member selected from the group consisting of quaternary ammonium salts, quaternary phosphonium salts and crown ethers.

Claim 11

Dependent Claim 158 words

A film or sheet of an aromatic polyester comprising (a) 1 to 99 0 by mole of units of the formula (I): and (b) units of the formula (II): wherein R 1 and R 2 are an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, R 3 , R 4 , R 5 and R 6 are the same or different and each is an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, chlorine atom or bromine atom, x and y are an integer of 1 to 4, z, x', y' and z' are 0 or an integer of 1 to 4, and X is a bivalent group selected from the group consisting of an alkylidene group having 1 to 8 carbon atoms, a cycloalkylidene group having 1 to 8 carbon atoms, -O-, -S-, -S0 2 - and -CO-.

Claim 12

Dependent Claim 158 words

A film or sheet of an aromatic polyester comprising (a) 1 to 99 0 by mole of units of the formula (I): and (b) units of the formula (II): wherein R 1 and R 2 are an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, R 3 , R 4 , R 5 and R 6 are the same or different and each is an alkyl group having 1 to 4 carbon atoms, an alkoxyl group having 1 to 4 carbon atoms, chlorine atom or bromine atom, x and y are an integer of 1 to 4, z, x', y' and z' are 0 or an integer of 1 to 4, and X is a bivalent group selected from the group consisting of an alkylidene group having 1 to 8 carbon atoms, a cycloalkylidene group having 1 to 8 carbon atoms, -O-, -S-, -S0 2 - and -CO-.

Claim 13

Dependent Claim 48 words

The film or sheet of Claim 9, wherein the units (I) are those having the formula (III): wherein R is an alkyl group having 1 to 4 carbon atoms or an alkoxyl group having 1 to 4 carbon atoms, and R 3 and z are as defined above.

Claim 14

Dependent Claim 12 words

The film or sheet of Claim 10, wherein R is methyl group.

Heat-resisting aromatic polyester and process for preparing the same

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