Synthesis of polyester-graft-poly(meth)acrylate copolymers

1. A composition, comprising:

three different polymers A, B and AB, and

comprising no styrene and no styrene derivative

wherein

polymer A is a copolyester prepared by cocondensation of itaconic acid,

polymer B is a (meth)acrylate homo- and/or copolymer comprising methacrylates and/or acrylates,

polymer AB is a graft copolymer comprising polymer A and polymer B, and

an amount of polymer A is between 5% by weight and 80% by weight,

an amount of polymer B is between 5% by weight and 80% by weight,

an amount of polymer AB is between 10% by weight and 80% by weight, based on a total mass of A, B, AB.

2. The composition according to claim 1 ,

wherein

the amount of polymer A is between 5% by weight and 60% by weight,

the amount of polymer B is between 5% by weight and 60% by weight,

the amount of polymer AB is between 20% by weight and 65% by weight, based on the total mass of A, B, AB.

3. The composition according to claim 2 ,

wherein

the amount of polymer A is between 5% by weight and 40% by weight,

the amount of polymer B is between 5% by weight and 40% by weight,

the amount of polymer AB is between 30% by weight and 50% by weight, based on the total mass of A, B, and AB.

4. The composition according to claim 1 , wherein polymer A is a polyester whose content of itaconic acid, based on a total amount of polycarboxylic acids, is between 0.1 mol % and 20 mol %.

5. The composition according to claim 4 , wherein polymer A is a polyester whose content of itaconic acid, based on the total amount of polycarboxylic acids, is between 1 mol % and 10 mol %.

6. The composition according to claim 5 , wherein polymer A is a polyester whose content of itaconic acid, based on the total amount of polycarboxylic acids, is between 2 mol % and 8 mol %.

7. The composition according to claim 1 , wherein polymer AB comprises graft copolymers with polyester main chains and poly(meth)acrylate side chains.

8. The composition according to claim 7 , wherein an average content of poly(meth)acrylate contents in an overall mixture is between 20% by weight and 80% by weight.

9. The composition according to claim 8 , wherein the average content of poly(meth)acrylate contents in the overall mixture is between 30% by weight and 70% by weight.

10. The composition according to claim 9 , wherein the average content of poly(meth)acrylate contents in the overall mixture is between 40% by weight and 60% by weight.

11. The composition according to claim 7 , wherein polymer AB is a compatibilizer between poly(meth)acrylates and polyesters.

12. A sealant formulation, comprising: the composition according to claim 1 .

13. A formulation of a heat-sealing coating, comprising the composition according to claim 1 .