Matt powder coatings

Patent metadata

Field	Value
Publication number	US-2017218222-A1
Application number	US-201515328718-A
Country	US
Kind code	A1
Filing date	Jul 9, 2015
Priority date	Jul 25, 2014
Publication date	Aug 3, 2017
Grant date	—

Abstract

The invention relates to a thermosetting powder coating composition B (PCC B) comprising a physical mixture of a thermosetting powder coating composition A (PCC A) with a separate, distinct thermosetting powder coating composition A1 (PCC A1). The invention further relates to a process for making said thermosetting powder coating composition B and processes for coating an article with said PCC B. The invention further relates to a cured PCC B. The invention further relates to an article having coated thereon said thermosetting powder coating composition B as well as to an article having coated and cured thereon said thermosetting powder coating composition B. The invention further relates to use of: the PCC B, the cured PCC B, articles coated with the PCC B, articles having coated and cured thereon the PCC B. The invention further relates to the use of the PCC B for matt powder coatings.

First claim

1 . A 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 comprises a binder K, said binder K comprising
a crosslinker X in an amount of at least 1 and of at most 90 pph binder K; and
a branched carboxylic acid functional polyester resin P in an amount of at least 10 and of at most 99 pph binder K, said polyester resin P having:
a. a T g of at least 40° C. as measured by Differential Scanning Calorimetry (DSC) at a heating rate of 5° C./min; and b. an acid value (AV) of at least 65 and of at most 76.8 mg KOH/g P; and c. a hydroxyl value of at most 10 mg KOH/g P; and d. a functionality of at least 3.5 and of at most 5; and said polyester resin P being the reaction product of at least the following monomers:
i) neopentyl glycol in an amount of at least 19 and of at most 38 mol %; and
ii) ethylene glycol in an amount of at least 8 and of at most 21 mol %; and
iii) a polyol in an amount of at least 0 and of at most 2 mol %; and
iv) isophthalic acid in an amount of at least 0 and of at most 3 mol %; and
v) terephthalic acid in an amount of at least 38 and of at most 47 mol %; and
vi) adipic acid in an amount of at least 0.01 and of at most 10 mol %; and
vii) a polycarboxylic acid, in an amount of at least 6 and of at most 10.2 mol %; and
wherein the mol % is based on the polyester resin P and wherein the total amount of monomers used for the preparation of the polyester resin P is 100 mol %; and wherein PCC A1 comprises a binder K1, said binder K1 comprising
a crosslinker X1 in an amount of at least 1 and of at most 90 pph binder K1;
and
a branched carboxylic acid functional polyester resin P1 in an amount of at least 10 and of at most 99 pph binder K1, said polyester resin P1 having:
a. a T g of at least 40° C. as measured by Differential Scanning Calorimetry (DSC) at a heating rate of 5° C./min; and b. an acid value (AV) of at least 19 and of at most 35 mg KOH/g P1; and c. a hydroxyl value of at most 7 mg KOH/g P1; and d. a functionality of at least 2.1 and of at most 3; and said polyester resin P1 being the reaction product of at least the following monomers:
i) neopentyl glycol in an amount of at least 25 and of at most 50 mol %; and
ii) ethylene glycol in an amount of at least 2.5 and of at most 20 mol %; and
iii) a C 6 diol in an amount of at least 1.1 and of at most 4.9 mol %; and
iv) isophthalic acid in an amount of at least 0 and of a most 6.5 mol %; and
v) terephthalic acid in an amount of at least 39 and of at most 48 mol %; and
vi) adipic acid in an amount of at least 1 and of at most 10 mol %; and
vii) an at least trifunctional monomer in an amount of at least 0.001 and of at most 3 mol %; and
wherein the mol % is based on the polyester resin P1 and wherein the total amount of monomers used for the preparation of the polyester resin P1 is 100 mol %;
and wherein the total amount of PCC A and PCC A1 in PCC B, is at least 10 pph PCC B, and wherein the weight ratio R=weight PCC A/weight PCC A1, is at least 0.2 and at most 8,

2 . The thermosetting powder coating composition B according to claim 1 , wherein the amount of the polyol is at least 0 and at most 1.4 mol %.

3 . The thermosetting powder coating composition B according to claim 1 , wherein the amount of the at least trifunctional monomer is at least 0.01 and at most 2.5 mol %.

4 . The thermosetting powder coating composition B according to claim 1 , wherein the branched carboxylic acid functional polyester resin P has an AV of at least 68 mg KOH/g P.

5 . The thermosetting powder coating composition B according to claim 1 , wherein the neopentyl glycol for the branched carboxylic acid functional polyester resin P is in an amount of at most 36.5 mol %.

6 . The thermosetting powder coating composition B according to claim 1 , wherein the polycarboxylic acid for the branched carboxylic acid functional polyester resin P is in an amount of at least 6.5 mol %.

7 . 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 32 mg KOH/g P1.

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 least 20 mg KOH/g P1.

9 . The thermosetting powder coating composition B according to claim 1 , wherein the branched carboxylic acid functional polyester resin P1 has an AV of at least 20 and of at most 28 mg KOH/g P1.

10 . The thermosetting powder coating composition B according to claim 1 , wherein the weight ratio R is at least 0.3 and at most 3.

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

13 . The thermosetting powder composition B according to claim 1 , 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 the crosslinker X1 is selected from the group consisting of epoxy compounds, BHA compounds and mixtures thereof.

14 . 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.

15 . A cured thermosetting powder coating composition B, as the thermosetting powder coating composition B is defined in claim 1 .

16 . The cured thermosetting powder coating composition B according to claim 15 , wherein said cured thermosetting powder coating composition B is a powder coating.

17 . An article having coated thereon a thermosetting powder coating composition B as defined in claim 1 .

18 . An article having coated and cured thereon a thermosetting powder coating composition B as defined in claim 1 .

19 . A process for making an article having coated and cured thereon a thermosetting powder coating composition B as defined in claim 1 , comprising the steps of:
a. applying the thermosetting powder coating composition B, to an article; b. heating and/or radiating the thermosetting powder coating composition B for enough time and at a suitable temperature to cure said thermosetting powder coating composition B to obtain the article having coated and cured thereon the thermosetting powder coating composition B.

20 . Use of:
i) a thermosetting powder coating composition B as defined in claim 1 ; or ii) a cured thermosetting powder coating composition B; or iii) an article; in powder coatings, powder-in-mould coatings, 3D-printing, automotive applications, marine applications, aerospace applications, medical applications, defense applications, sports/recreational applications, architectural applications, bottling applications, household applications, machinery applications, can applications, coil applications, energy applications, textile applications and electrical applications.

21 . Use of a thermosetting powder coating composition B as defined in claim 1 for matt powder coatings.

Assignees

• Dsm Ip Assets Bv

Inventors

• Bos Matthias Johannes Cornelis
• Buijsen Paulus Franciscus Anna
• Hettinga Johannes Albertus

Classifications

• C09D167/00

  Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09D177/12; based on polyester-imides C09D179/08); Coating compositions based on derivatives of such polymers · CPC title

• C09D5/032

  characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish · CPC title

• C08G63/20 Primary

  Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups · CPC title

• B05D1/06

  Applying particulate materials · CPC title

• C09D5/03

  Powdery paints · CPC title