Continuous process for preparing polyalkylene arylates with hyperbranched polyesters and/or polycarbonates

1. A continuous process for preparation of polyalkylene arylates A) comprising hyperbranched polymers B) and, optionally, comprising lubricants C), by

esterifying or transesterifying an aromatic dicarboxylic acid or its ester or ester-forming derivatives, with a molar excess of an aliphatic dihydroxy compound, and

polycondensing the resultant transesterification or esterification product, which comprises, on achievement of at least 80% of a selected viscosity number, adding component B) and also, optionally, C) to the polymer melt of polyalkylene arylates A), wherein the amount of component B) added is from 0.01 to 10% by weight, based on 100% by weight of components A) to C), and, optionally,

post-condensing the melt and then discharging, cooling, and pelletizing it, and also using, as component B), at least one hyperbranched polycarbonate B1) with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, Part 2), or at least one hyperbranched polyester B2) of A x B y type, where x is at least 1.1 and y is at least 2.1, or a mixture of these;

wherein the degree of branching for B1) and B2) is between 10 and 99.9%.

2. The process according to claim 1 , wherein the amount of component B) added is from 0.1 to 10% by weight, based on 100% by weight of components A) to C).

3. The process according to claim 1 , which uses a polyalkylene terephthalate.

4. The process according to claim 1 , wherein, as lubricant, use is made of esters or amides of carboxylic acids having from 10 to 40 carbon atoms, or a mixture of these.

5. The process according to claim 1 , which uses pentaerythritol tetrastearate as lubricant.

6. The process according to claim 1 , wherein B) is suspended prior to addition to the melt, optionally at an elevated temperature, in the lubricant C).

7. The process according to claim 6 , wherein the temperature at which the suspension is prepared for addition to the polymer melt is from 30 to 150° C.

8. The process according to claim 1 , which uses, as component B1), a polycarbonate with a number-average molar mass M n of from 100 to 15 000 g/mol.

9. The process according to claim 1 , which uses, as component B1), a polycarbonate with a glass transition temperature Tg of from −80 to 140° C.

10. The process according to claim 1 , which uses, as component B1), a polycarbonate with a viscosity (mPas) at 23° C. of from 50 to 200 000 to DIN 53019.

11. The process according to claim 1 , which uses, as component B2), a polyester with a number-average molar mass M n of from 300 to 30 000 g/mol.

12. The process according to claim 1 , which uses, as component B2), a polyester with an OH number (to DIN 53 240) of from 0 to 600 mg KOH/g of polyester.

13. The process according to claim 1 , which uses, as component B2), a polyester with a COOH number (to DIN 53 240) of from 0 to 600 mg KOH/g of polyester.

14. The process according to claim 1 , which uses, as component B2), a polyester, where at least one OH number or one COOH number is greater than 0.

15. The process according to claim 2 , which uses a polyalkylene terephthalate.

16. The process according to claim 2 , wherein, as lubricant, use is made of esters or amides of carboxylic acids having from 10 to 40 carbon atoms, or a mixture of these.

17. The process according to claim 3 , wherein, as lubricant, use is made of esters or amides of carboxylic acids having from 10 to 40 carbon atoms, or a mixture of these.

18. The process according to claim 2 , which uses pentaerythritol tetrastearate as lubricant.

19. The process according to claim 3 , which uses pentaerythritol tetrastearate as lubricant.