Matt powder coatings

1. A two component (2k) thermosetting powder coating composition B (PCC B) comprising a physical mixture of two different, separate and distinct thermosetting powder coating compositions A (PCC A) and A1 (PCC A1), wherein

PCC A and PCC A1 are present in PCC B in a total amount which is at least 30 pph of PCC B, and wherein a weight ratio R=weight PCC A/weight PCC A1, is at least 0.3 and at most 3, and wherein

PCC A comprises a binder K in an amount of at least 20 and at most 100 pph of PCC A, wherein the binder K comprises:

a crosslinker X in an amount of at least 1 and at most 55 pph of the binder K, wherein the crosslinker X is selected from the group consisting of epoxy compounds, compounds having at least two β-hydroxyalkylamide groups (BHA compounds) and mixtures thereof; and

a branched carboxylic acid functional polyester resin P in an amount of at least 45 and at most 99 pph of the binder K, wherein the branched carboxylic acid functional polyester resin P has:

(a) a T g of at least 40° C. as measured by Differential Scanning calorimetry (DSC) at a heating rate of 5° C./min;

(b) an acid value (AV) of at least 65 and of at most 76.8 mg KOH/g of the polyester resin P;

(c) a hydroxyl value of at most 9 mg KOH/g of the polyester resin P; and

(d) a functionality of at least 3.5 and at most 5; wherein

the branched carboxylic acid functional polyester resin P is a reaction product of at least the following monomers:

i) neopentyl glycol in an amount of at least 19 and at most 38 mol %;

ii) ethylene glycol in an amount of at least 8 and at most 21 mol %;

iii) a polyol in an amount of at least 0 and at most 2 mol %;

iv) isophthalic acid in an amount of at least 0 and at most 2.4 mol %;

v) terephthalic acid in an amount of at least 38 and at most 47 mol %;

vi) adipic acid in an amount of at least 0.01 and at most 10 mol %; and

vii) a polycarboxylic acid, in an amount of at least 6 and at most 10.2 mol %; and wherein

the mol % is based on a total amount of monomers i)-vii) forming the polyester resin P being 100 mol %, and wherein

PCC A1 comprises a binder K1 in an amount of at least 20 and at most 100 pph of PCC A1, wherein the binder K1 comprises:

a crosslinker X1 in an amount of at least 1 and at most 55 pph of the binder K1, wherein the crosslinker X1 is selected from the group consisting of epoxy compounds, compounds having at least two β-hydroxyalkylamide groups (BHA compounds) and mixtures thereof; and

a branched carboxylic acid functional polyester resin P1 in an amount of at least 45 and at most 99 pph of the binder K1, wherein

the polyester resin P1 has:

(a) a T g of at least 40° C. as measured by Differential Scanning calorimetry (DSC) at a heating rate of 5° C./min;

(b) an acid value (AV) of at least 20 and at most 30 mg KOH/g of the polyester resin P1;

(c) a hydroxyl value of at most 6 mg KOH/g of the polyester resin P1; and

(d) a functionality of at least 2.1 and of at most 3; wherein

the polyester resin P1 is a reaction product of at least the following monomers:

i) neopentyl glycol in an amount of at least 25 and at most 50 mol %;

ii) ethylene glycol in an amount of at least 5 and at most 20 mol %;

iii) a C 6 diol in an amount of at least 1.5 and at most 4.7 mol %;

iv) isophthalic acid in an amount of at least 0 and at most 6.5 mol %;

v) terephthalic acid in an amount of at least 39 and at most 48 mol %;

vi) adipic acid in an amount of at least 1 and at most 10 mol %; and

vii) an at least trifunctional monomer in an amount of at least 0.001 and at most 3 mol %; and wherein

the mol % is based on a total amount of monomers i)-vii) forming the polyester resin P1 being 100 mol %.

2. The thermosetting powder coating composition B according to claim 1 , wherein the at least trifunctional monomer of the polyester resin P1 is present in an amount of at least 0.01 and at most 2.5 mol %.

3. The thermosetting powder composition B according to claim 2 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.

4. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 2 .

5. The thermosetting powder coating composition B according to claim 1 , wherein the branched carboxylic acid functional polyester resin P1 has an AV of at most 29 mg KOH/g of the polyester resin P1.

6. The thermosetting powder composition B according to claim 5 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.

7. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 5 .

8. The thermosetting powder coating composition B according to claim 1 , wherein the branched carboxylic acid functional polyester resin P1 has an AV of at most 28 mg KOH/g of the polyester resin P1.

9. The thermosetting powder composition B according to claim 8 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.

10. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 8 .

11. The thermosetting powder coating composition B according to claim 1 , wherein the weight ratio R is at least 0.4 and at most 2.5.

12. The thermosetting powder composition B according to claim 11 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.

13. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 11 .

14. The thermosetting powder coating composition B according to claim 1 , wherein the weight ratio R is at least 0.6 and at most 1.5.

15. The thermosetting powder composition B according to claim 14 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.

16. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 14 .

17. The thermosetting powder composition B according to claim 1 , wherein the crosslinker X is a BHA compound and the crosslinker X1 is a BHA compound.

18. A cured thermosetting powder coating composition obtained by curing the thermosetting powder coating composition B according to claim 1 .

19. A coated article having a cured coating thereon, wherein the cured coating is the cured thermosetting powder coating composition according to claim 18 .

20. A coated article having a coating thereon comprised of the thermosetting powder coating composition B according to claim 1 .

21. A process for making an article having a coating of a cured thermosetting powder coating composition B, wherein the process comprises the steps of:

(a) applying the thermosetting powder coating composition B according to claim 1 to an article to form a coating thereon; and

(b) heating and/or radiating the coating of the thermosetting powder coating composition B for enough time and at a suitable temperature to cure the thermosetting powder coating composition B to thereby obtain the article having a coating of the cured thermosetting powder coating composition B.

22. The process according to the claim 21 , wherein the crosslinker X is the BHA compound and the crosslinker X1 is the BHA compound.