End-capped polyimide oligomers

Claim 2

A product selected from the group consisting of: A. An acetylene end-capped polyimide oligomer whose principal component has the structure: ##STR10## where R has the structure; ##STR11## where X is ##STR12## or a bond; where R' is an aryl group; and where R" is an aryl group bearing a substituent having the structure; ##STR13## B. A first precursor of an acetylene end-capped polyimide oligomer of (A) whose principal component has the structure; ##STR14## where R, R' and R" are as defined above; and C. A second precursor of an acetylene end-capped polyimide oligomer of (A) whose principal component has the structure; ##STR15## where R, R' and R" are as defined above, and where R''' is the alcohol moiety from which the diester of the aromatic tetracarboxylic acid was prepared.

Claim 3

An acetylene end-capped polyimide oligomer whose principal component has the structure; ##STR16## where R has the structure; ##STR17## where X is ##STR18## or a bond; where R' is an aryl group, and where R" is an aryl group bearing a substituent having the structure: ##STR19##

Claim 4

An acetylene end-capped polyimide oligomer whose principal component has the structure; ##STR16## where R has the structure; ##STR17## where X is ##STR18## or a bond; where R' is an aryl group, and where R" is an aryl group bearing a substituent having the structure: ##STR19##

Claim 5

A precursor of an acetylene end-capped polyimide oligomer, said precursor having the structure: ##STR20## where R has the structure; ##STR21## where X is ##STR22## or a bond; where R' is an aryl group; and where R" is an aryl group bearing a substituent having the structure: ##STR23##

Claim 6

A precursor of an acetylene end-capped polyimide oligomer, said precursor having the structure: ##STR20## where R has the structure; ##STR21## where X is ##STR22## or a bond; where R' is an aryl group; and where R" is an aryl group bearing a substituent having the structure: ##STR23##

Claim 7

A precursor of an acetylene end-capped polyimide oligomer, said precursor having the structure: ##STR24## where R has the structure; ##STR25## where X is ##STR26## or a bond; where R' is an aryl group; where R" is an aryl group bearing a substituent having the structure: ##STR27## and where R''' is the alcohol moiety from which the diester of the aromatic tetracarboxylic acid was prepared.

Claim 8

A precursor of an acetylene end-capped polyimide oligomer, said precursor having the structure: ##STR24## where R has the structure; ##STR25## where X is ##STR26## or a bond; where R' is an aryl group; where R" is an aryl group bearing a substituent having the structure: ##STR27## and where R''' is the alcohol moiety from which the diester of the aromatic tetracarboxylic acid was prepared.

Claim 9

A product of claim 1, 2, 3, or 4 in which R' has the structure: ##STR28##

Claim 10

A product of claim 1, 2, 3, 4 in which R has the structure: ##STR29##

Claim 11

A product of claim 1, 2, 3, or 4 in which R has the structure: ##STR30## and where R' has the structure: ##STR31##

Claim 12

A product of claim 1, 2, 3, or 4 in which R has the structure: ##STR32## R' has the structure: ##STR33## and R" has the structure: ##STR34##

Claim 13

A coating and laminating varnish consisting essentially of a product of claim 3 dissolved in a solvent selected from the group consisting of N-methyl-2-pyrrolidone, cyclohexanone, diethyl carbonate, and gamma-butyrolactone.

Claim 14

A coating and laminating varnish consisting essentially of a product of claim 4 dissolved in a solvent having an atmospheric boiling point of less than about 150° C. and selected from the group consisting of lower alkanols containing up to about 5 carbon atoms, lower ethers containing up to about 6 carbon atoms, and mixtures thereof.

Claim 15

A product of claim 1, 2, 3, 4, 9, or 10 in which up to 50 mol % of the terminal ##STR35## groups of R" is replaced with a hydrogen atom.

Claim 16

A process for preparing a product of claim 3 which consists essentially of: A. Dissolving at least 17 weight % of an aromatic tetracarboxylic acid dianhydride in a solvent at a temperature of at least 60° C., B. Maintaining a solution of step (A) containing substantially 1 molar portion of said aromatic tetracarboxylic acid dianhydride at a temperature in a range of about 30°-100° C. and adding substantially 0.33 molar portion of an aromatic triamine thereto, and C. Adding substantially 1.0 molar portion of a 1-(aminoaryl)-3-hydroxy-3-methyl-1-butyne to the product of step (b); said aromatic tetracarboxylic acid dianhydride having the formula: ##STR36## where R has the structure: ##STR37## where X is ##STR38## or a bond; said aromatic triamine having the formula: ##STR39## where R' is an aryl group; and said 1-(aminoaryl)-3-hydroxyl-3-methyl-1-butyne having the formula: ##STR40## where R" is an aryl group; and the solvent employed in step (A) is selected from the group consisting of N-methyl-2-pyrrolidone, cyclohexanone, diethyl carbonate, and gamma-butyrolactone.

Claim 17

A process for preparing a product of claim 4 which consists essentially of: A. Adding, with stirring, a solution containing substantially 0.33 molar portion of an aromatic triamine to a solution containing substantially 1.0 molar portion of a dialkyl ester of an aromatic tetracarboxylic acid, and B. Adding substantially 1.0 molar portion of a 1-(aminoaryl)-3-hydroxy-3-methyl-1-butyne to the solution of (A); the dialkyl ester of the aromatic tetracarboxylic acid employed in step (A) having the formula: ##STR41## where R has the structure: ##STR42## where X is ##STR43## or a bond, and where R''' is the moiety of an alkanol containing up to about 5 carbon atoms; said aromatic triamine having the formula: ##STR44## where R' is an aryl group; and said 1-(aminoaryl)-3-hydroxyl-3-methyl-1-butyne having the formula: ##STR45## where R" is an aryl group; the solvent employed in Step (A) having an atmospheric boiling point of less than about 150° C. and is selected from the group consisting of lower alkanols containing up to about 5 carbon atoms, lower ethers containing up to about 6 carbon atoms, and mixtures thereof.

Claim 18

A process of claim 12 or 13 in which R' has the structure: ##STR46##

Claim 19

A process of claim 12 or 13 in which R has the structure: ##STR47##

Claim 20

A process of claim 12 or 13 in which R has the structure: ##STR48## and where R' has the structure: ##STR49##

Claim 21

A process of claim 12 or 13 in which R has the structure: ##STR50## R' has the structure: ##STR51## and R" has the structure: ##STR52##

Claim 22

A process for preparing a product of claim 2 which consists essentially of preparing a product of claim 3 by the method of claim 9 and effecting ring closure of the amic acid groups by a dehydration reaction.

Claim 23

A process for preparing a product of claim 2 which consists essentially of preparing a product of claim 4 by the process of claim 10 and heating said product to effect a ring closure to form imide groups.

Claim 24

A process of claim 12, 13, 18 or 19 in which up to 50 mol % of the terminal ##STR53## groups of R" is replaced with a hydrogen atom.