Claims
- 1. A method for preparing a branched polymer which comprises the steps of:
- (I) forming a reactive concentrate by effecting reaction between the constituents of a mixture consisting essentially of (A) at least one poly(O- or N-epoxyalkyl-substituted) cyclic amide, imide or imidate with (B) at least one linear polymer having substantial proportions of at least one of ester and carbonate structural units, a number average molecular weight of at least about 4000 and a measurable proportion of free carboxylic acid groups, and
- (II) melt blending said concentrate with (C) at least one linear polyester having a substantial proportion of free carboxylic acid groups;
- the proportion of reagent A employed in step I being at least about 3 parts by weight per 100 parts of reagent B, and about 0.1-3.0 parts per 100 parts of the total of reagents B and C.
- 2. A method according to claim 1 wherein reagent A contains a single triazine, barbiturate, hydantoin, uracil, pyromellitic diimide, piperazinedione or parabanate moiety and the epoxyalkyl groups therein are bonded directly to oxygen or nitrogen atoms.
- 3. A method according to claim 2 wherein reagent B is a polyester, polycarbonate or polyester-polycarbonate.
- 4. A method according to claim 3 wherein reagent A is triglycidyl isocyanurate.
- 5. A method according to claim 4 wherein reagent B is a linear polyester comprising structural units of the formula ##STR4## wherein each R.sup.1 is independently a divalent aliphatic, alicyclic or aromatic radical containing about 2-10 carbon atoms and R.sup.2 is a divalent aromatic radical containing about 6-10 carbon atoms.
- 6. A method according to claim 5 wherein reagent C is a poly(ethylene terephthalate) or a poly(butylene terephthalate) having a carboxylic acid end group concentration in the range of about 10-100 microequivalents per gram.
- 7. A method according to claim 6 wherein step I is effected in the melt.
- 8. A method according to claim 6 wherein reagents B and C are identical, each R.sup.1 is ethylene or tetramethylene and each R.sup.2 is p-phenylene.
- 9. A method according to claim 8 wherein the proportion of reagent A is about 3-20 parts per 100 parts of reagent B and about 0.4-0.6 part per 100 parts of the total of reagents B and C.
- 10. A method according to claim 9 wherein reagents B and C are each a poly(butylene terephthalate) having a carboxylic acid end group concentration in the range of about 40-80 microequivalents per gram.
- 11. A composition comprising a blend of:
- the reaction product of a mixture consisting essentially of (A) at least one poly (O- or N-epoxyalkyl-substituted) cyclic amide, imide or imidate with (B) at least one linear polymer having substantial proportions of at least one of ester and carbonate structural units, a number average molecular weight of at least about 4000 and a measurable proportion of free carboxylic acid groups, the proportion of reagent A being at least about 3 parts by weight per 100 parts of reagent B; and
- (C) at least one linear polyester having a substantial proportion of free carboxylic acid groups;
- wherein reagent A is employed in the amount of about 0.1-3.0 parts per 100 parts of the total of reagents B and C and the weight ratio of component C to the reaction product of components A and B is at least 7.5:1.
- 12. A composition according to claim 11 wherein reagent A contains a single triazine, barbiturate, hydantoin, uracil, pyromellitic diimide, piperazinedione or parabanate moiety and the epoxyalkyl groups therein are bonded directly to oxygen or nitrogen atoms.
- 13. A composition according to claim 12 wherein reagent B is a polyester, polycarbonate or polyester-polycarbonate.
- 14. A composition according to claim 13 wherein reagent A is triglycidyl isocyanurate.
- 15. A composition according to claim 14 wherein reagent B is a linear polyester comprising structural units of the formula ##STR5## wherein each R.sup.1 is independently a divalent aliphatic, alicyclic or aromatic radical containing about 2-10 carbon atoms and R.sup.2 is a divalent aromatic radical containing about 6-10 carbon atoms.
- 16. A composition according to claim 15 wherein reagent C is a poly(ethylene terephthalate) or a poly(butylene terephthalate) having a carboxylic acid end group concentration in the range of about 10-100 microequivalents per gram.
- 17. A composition according to claim 16 wherein reagents B and C are identical, each R.sup.1 is ethylene or tetramethylene and each R.sup.2 is p-phenylene.
- 18. A composition according to claim 17 wherein the proportion of reagent A is about 3-20 parts per 100 parts of reagent B and about 0.4-0.6 part per 100 parts of the total of reagents B and C.
- 19. A composition according to claim 18 wherein reagents B and C are each a poly(butylene terephthalate) having a carboxylic acid end group concentration in the range of about 40-80 microequivalents per gram.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 043,074, filed Apr. 27, 1987, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4141882 |
Kodama et al. |
Feb 1979 |
|
Foreign Referenced Citations (3)
Number |
Date |
Country |
50-96648 |
Jul 1975 |
JPX |
53-106749 |
Sep 1978 |
JPX |
56-116749 |
Dec 1981 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Billmeyer, Textbook of Polymer Science, (John Wiley & Sons, 1971), p. 258. |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
43074 |
Apr 1987 |
|