US4154919A — Linear and cross-linked polybenzimidazoles

Claim 1

Independent Claim 132 words

A polybenzimidazole having a polymer chain with repeating unit represented by the following formula: ##STR23## wherein R 1 is a divalent moiety selected from the group consisting of (a) an arylene having from 6 to 12 carbon atoms, (b) an alkylene having from 1 to 12 carbon atoms, (c) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR24## R 2 is a divalent carbon ring moiety with the linkage to an adjacent repeating unit through adjacent carbon atoms of said ring, said ring moiety being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4.

Claim 2

Dependent Claim 132 words

A polybenzimidazole having a polymer chain with repeating unit represented by the following formula: ##STR23## wherein R 1 is a divalent moiety selected from the group consisting of (a) an arylene having from 6 to 12 carbon atoms, (b) an alkylene having from 1 to 12 carbon atoms, (c) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR24## R 2 is a divalent carbon ring moiety with the linkage to an adjacent repeating unit through adjacent carbon atoms of said ring, said ring moiety being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4.

Claim 3

Dependent Claim 29 words

The polybenzimidazole of claim 1 in which said repeating unit is cross-linked to a repeating unit of an adjacent polymer chain through a bridge interconnecting said R 2 moieties.

Claim 4

Dependent Claim 28 words

The polybenzimidaole of claim 2 in which said bridge is formed directly between said R 2 moieties each comprising the reaction product of a dianhydride or its equivalent.

Claim 5

Dependent Claim 16 words

The polybenzimidazole of claim 1 in a partially condensed state in solution in an organic solvent.

Claim 6

Dependent Claim 14 words

The polybenzimidazole of claim 1 in the form of a film or a fiber.

Claim 7

Dependent Claim 22 words

The polybenzimidazole of claim 1 in which said R 2 ring comprises an arylene and said linkage is at the ortho position.

Claim 8

Dependent Claim 131 words

A polybenzimidazole comprising the condensation product of (a) a substituted carbon ring compound having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms, said ring compound being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, and (b) an organic tetraamine of the following formula: ##STR25## wherein R 1 is a divalent moiety selected from the group consisting of (1) an arylene having from 6 to 12 carbon atoms, (2) an alkylene having from 1 to 12 carbon atoms, (3) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR26## R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4.

Claim 9

Dependent Claim 131 words

A polybenzimidazole comprising the condensation product of (a) a substituted carbon ring compound having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms, said ring compound being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, and (b) an organic tetraamine of the following formula: ##STR25## wherein R 1 is a divalent moiety selected from the group consisting of (1) an arylene having from 6 to 12 carbon atoms, (2) an alkylene having from 1 to 12 carbon atoms, (3) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR26## R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4.

Claim 10

Dependent Claim 24 words

The polybenzimidazole of claim 7 in which said ring compound component comprises from 0.5 mole percent to 100 percent of a tetracarboxylic cross-linking agent.

Claim 11

Dependent Claim 16 words

The polybenzimidazole of claim 7 in a partially condensed state in solution in an organic solvent.

Claim 12

Dependent Claim 14 words

The polybenzimidazole of claim 7 in which said ring compound compound comprises phthalic anhydride.

Claim 13

Independent Claim 149 words

A method for forming a polybenzimidazole comprising (a) mixing a substituted carbon ring compound having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms, said ring compound being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, with an organic tetraamine of the following formula: ##STR27## wherein R 1 is a divalent moiety selected from the group consisting of (1) an arylene having from 6 to 12 carbon atoms, (2) an alkylene having from 1 to 12 carbon atoms, (3) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR28## R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4, to form a prepolymer mixture and (b) heating the mixture of step (a) to form a condensation polymer.

Claim 14

Independent Claim 149 words

A method for forming a polybenzimidazole comprising (a) mixing a substituted carbon ring compound having at least one dicarboxylic anhydride or its equivalent substituted at adjacent carbon atoms, said ring compound being selected from the group consisting of an arylene having from 6 to 12 carbon atoms and a cycloalkylene having from 5 to 8 carbon atoms, with an organic tetraamine of the following formula: ##STR27## wherein R 1 is a divalent moiety selected from the group consisting of (1) an arylene having from 6 to 12 carbon atoms, (2) an alkylene having from 1 to 12 carbon atoms, (3) a cycloalkylene having from 5 to 8 carbon atoms, inclusive, ##STR28## R 3 is selected from the group of lower-alkyl, lower-alkoxy, and halo, x is an integer from 0 to 4, to form a prepolymer mixture and (b) heating the mixture of step (a) to form a condensation polymer.

Claim 15

Dependent Claim 24 words

The method of claim 11 comprising adding a tetracarboxylic cross-linking agent to said prepolymer mixture so that said prepolymer is cross-linked during step (b).

Claim 16

Dependent Claim 24 words

The method of claim 12 in which said cross-linking agent comprises from 0.5 mole percent to 100 mole percent of said dicarboxylic acid component.

Claim 17

Dependent Claim 32 words

The method of claim 11 in which said prepolymer is dissolved in an organic solvent, coated onto a substrate, and the coated substrate is heated in step (b) to form a laminate.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-05-14	1982-11-13	1983-05-15	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-05-14	1986-11-13	1987-05-15	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-05-14	1990-11-13	1991-05-15	$7700.00	Window Closed / Lapsed

Linear and cross-linked polybenzimidazoles

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