Process for the production of polyquinazolone-based polymers

Claim 2

A process for producing a polyquinazolone-based polymer having, as a repeating unit, a bisquinazolone unit represented by formula (IIIa): ##STR12## wherein R 1 is a tetravalent aromatic group; R 2 is independently an alkyl group or an aromatic group; and R 3 is a divalent organic group; which comprises polymerizing nearly equimolar amounts of (a) a bisoxazinone represented by formula (I): ##STR13## wherein R 1 and R 2 are the same as described above, and (b) a diamine represented by formula (IIa): H.sub.2 N--R.sup.3 --NH.sub.2 (IIa) wherein R 3 is the same as described above, in an aprotic polar organic solvent in the presence of a Lewis acid catalyst.

Claim 3

The process as claimed in claim 1, wherein the Lewis acid catalyst is a metal halide.

Claim 4

The process as claimed in claim 2, wherein the Lewis acid is at least one metal halide selected from the group consisting of stannous chloride, cupric chloride, cobalt chloride, ferric chloride and nickel chloride.

Claim 5

The process as claimed in claim 1, wherein the amount of the Lewis acid catalyst is about 0.002 to 0.2 mol per mol of the bisoxazinone (a).

Claim 6

The process as claimed in claim 1, wherein less than about 10 mol% of the diamine of formula (IIa) is replaced by a diamine represented by formula (IIb): ##STR14## wherein R 4 is a (p+2)-valent aromatic group, Z is independently a group of the formula --COOH or --SO 3 H or a metal salt thereof, and p is an integer of from 1 to 4.

Claim 7

The process as claimed in claim 1 or 5, wherein the bisoxazinone (a) and the diamine (b) are polymerized in the presence of a phosphorus-containing dehydrating agent.

Claim 8

The process as claimed in claim 6, wherein the phosphorus-containing dehydrating agent is phosphorus pentoxide.

Claim 9

The process as claimed in claim 6, wherein the amount of the phosphorus-containing dehydrating agent is about 0.001 to 0.4 mol per mol of the bisoxazinone (a).

Claim 10

A process for producing a polyquinazolone-based polymer having, as repeating units, a bisquinazolone unit represented by formula (IIIa): ##STR15## wherein R 1 is a tetravalent aromatic group; R 2 is independently an alkyl group or an aromatic group; and R 3 is a divalent organic group; and a bisquinazolone unit represented by formula (IIIb): ##STR16## wherein R 1 and R 2 are the same as described above; R 4 is a (p+2)-valent aromatic group; Z is independently a group of the formula --COOH or --SO 3 H or a metal salt thereof; and p is an integer of from 1 to 4; which comprises reacting nearly equimolar amounts of (a) a bisoxazinone represented by formula (I): ##STR17## wherein R 1 and R 2 are the same as described above; and (b) a diamine component consisting of a diamine represented by formula (IIa): H.sub.2 N--R.sup.3 --NH.sub.2 (IIa) wherein R 3 is the same as described above, and a diamine represented by formula (IIb): ##STR18## wherein R 4 , Z and p are the same as described above, in an aprotic polar organic solvent in the presence of a phosphorus-containing dehydrating agent.

Claim 11

A process for producing a polyquinazolone-based polymer having, as repeating units, a bisquinazolone unit represented by formula (IIIa): ##STR15## wherein R 1 is a tetravalent aromatic group; R 2 is independently an alkyl group or an aromatic group; and R 3 is a divalent organic group; and a bisquinazolone unit represented by formula (IIIb): ##STR16## wherein R 1 and R 2 are the same as described above; R 4 is a (p+2)-valent aromatic group; Z is independently a group of the formula --COOH or --SO 3 H or a metal salt thereof; and p is an integer of from 1 to 4; which comprises reacting nearly equimolar amounts of (a) a bisoxazinone represented by formula (I): ##STR17## wherein R 1 and R 2 are the same as described above; and (b) a diamine component consisting of a diamine represented by formula (IIa): H.sub.2 N--R.sup.3 --NH.sub.2 (IIa) wherein R 3 is the same as described above, and a diamine represented by formula (IIb): ##STR18## wherein R 4 , Z and p are the same as described above, in an aprotic polar organic solvent in the presence of a phosphorus-containing dehydrating agent.

Claim 12

The process as claimed in claim 9, wherein the diamine of formula (IIb) is about 10 mol% or more of the total amount of the diamine component (b).

Claim 13

The process as claimed in claim 9, wherein the phosphorus-containing dehydrating agent is phosphorus pentoxide.

Claim 14

The process as claimed in claim 9, wherein the amount of the phosphorus-containing dehydrating agent is about 0.001 to 0.4 mol per mol of the bisoxazinone (a).

Claim 15

The process as claimed in claim 9, wherein the bisoxazinone (a) and the diamine component (b) are polymerized in the presence of a Lewis acid catalyst.

Claim 16

The process as claimed in claim 13, wherein the Lewis acid catalyst is a metal halide.

Claim 17

The process as claimed in claim 14, wherein the Lewis acid catalyst is at least one metal halide selected from the group consisting of stannous chloride, cupric chloride, cobalt chloride, ferric chloride and nickel chloride.

Claim 18

The process as claimed in claim 13, wherein the amount of the Lewis acid catalyst is about 0.002 to 0.2 mol per mol of the bisoxazinone (a).