Capa™ Polyols

For excellent properties in crosslinked coatings

European Coating SHOW 2013 Nürnberg

Pär Jörgensen – Specialist

Introduction of PerstorpIntroduction of Caprolactones (Capa™)Use of Capa™ polyols in 2K PUR high solid coatingsUse of Capa™ polyols in 1K systems based on HMMM crosslinkersConclusions

Outline

Perstorp todayThe Perstorp Group

1881 – Perstorp was formed Family owned for more than 100 yearsSince 2005 controlled by PAI partners, a French private equity companyApproximately 1,500 employees in 22 countriesAnnual turnover of around 1.3 billion EURWorld leader of several products for resins and paints

What are Capa™ – Caprolactones?Capa™ monomer

– One grade

– 99.9% purity

Capa ™ polyols

– Produced by ring opening poly-merization of Capa™ monomer initiated with hydroxyl groups

– Di, tri, tetra-functional polyols

– 300 - 8,000 g/mol

Perstorp biggest supplierof caprolactones in the world

Capa™ Polyolsfor crosslinked coatings

General propertiesLow VOCHigh gloss and low haze due to perfect compatibility between Capa™, acrylics, polyesters and crosslinkers

Product Type Mw OH-value(mg KOH/g)

OH % Viscosity(mPas @23 °C)

Recommendation

Capa™ 2043 Diol 400 280 8.5 240 2K PUR/ 1K HMMM

Capa™ 2054 Diol 550 204 6.2 - 1K HMMM

Capa™ 2085 Diol 830 135 4.1 - 1K HMMM

Capa™ 3050 Triol 540 310 9.4 1,190 2K PUR

Capa™ 3091 Triol 900 183 5.5 1,246 2K PUR/1K HMMM

Capa™ 4101 Tetrol 1,000 218 6.6 1,850 2K PUR

Caprolactones are aliphatic, liquid, low viscosity polyols suitable as reactive diluents

Good final hardnessExcellent chemical resistanceExcellent outdoor durability

Capa™ in 2K PUR Formulations

* Solvent ratio 8:67:25 ** BYK-315, BYK-322. BYK-358

A B C

Part A Reference system Acrylic/Capa 3050 Higher amount of Capa 3050

Acrylic polyol (75% in BuAc)Polyester ref (78% in BuAc)Capa 3050Solvent mixture(BuAc+Solvesso 100+MAK)*Additive package**DBTL (1% BuAc)

4.5% OH5.4% OH9.4% OH

71.437.7

18.0

0.92.0

71.43

3.422.2

0.92.0

61.5

7.028.6

0.92.0

Total 100.0 100.0 100.0

Part B NCO/OH 1.05

Tolonate HDT LV2Solvent mixture(BuAc+Solvesso 100+MAK)*to adjust viscosity to 22 secin DIN cup 4 at 23 C

30.816.6

30.810.4

30.80

In formulation B Capa™ is added to match the OH content of the polyester reference. Formulation C contains twice that amount while keeping an equal OH/NCO molar ratio.

355

360

365

370

375

380

385

390

395

A - Reference system B - Acrylic/Capa 3050 C - Acrylic/2*Capa 3050

Capa™ in 2K PUR Effect on VOC

-25 g/L

VOC in g/l to obtain 22 sec in DIN cup 4 at 23 C

By addition of Capa™ to the formulation it is possible to further decrease the VOC content without compromising the viscosity

0

50

100

150

200

250

A - Reference system B - Acrylic/Capa 3050 C - Acrylic/2*Capa 3050

Scratch resistance was performed on Taber Model 550 (rotation speed 0.5 tr/min) Applied on Taber glass panels (hole in the center) at RT

Capa™ in 2K PUR Scratch resistance

Weight (force) needed to obtain permanent scratch, weight in g

The resistance of the coatings towards permanent scratches is largely increased with the addition of Capa™ – polycaprolactones

Capa™ in 2K PURAbrasion resistance

0

5

10

15

20

25

30

35

A - Reference system B - Acrylic/Capa 3050 C - Acrylic/2*Capa 3050

Mg

of c

oati

ng r

emov

ed

duri

ng t

he a

bras

ion

Taber abrasion on steelCS10 wheels, 500 g load, 1,000 cycles, weight loss, mg

The coating formulations containing Capa™ – polycaprolactones show a superior abrasion resistance compared to the reference formulation containing a conventional polyester

Capa™ in 2K PURQUV-B exposure Decrease in gloss at 20°

0

10

20

30

40

50

60

70

80

90

100

0 500 1 000 1 500 2 000

Rel

ativ

e gl

oss

decr

ease

, %

h in QUV-B

A - Reference system

B - Acrylic/Capa 3050

C - Acrylic/2*Capa 3050

Coatings containing Capa™ – polycaprolactones are more resistant to UV-B exposure in terms of gloss retention

Measured on Al panels: 45µm dry of clearcoat over white basecoat

Cycle: Succession of 4 hours periods of UV-B exposure at 60 °C each followed by 4 hours periods of condensation at 40 °C

Accelerated weathering (QUV-B)

Capa™ in 1K HMMM Formulations

Set parameters

Polyol Acrylic/Capa™ Polyols

Crosslinker (HMMM) Cymel 303*

Solvent BuAc

Catalyst pTSA

Solid content 73%

Polyol/melamine (solid) 80/20

Curing 150 °C, 10min

Varied parameters

Acrylic polyol ref 70-100%

Capa™ Polyols 0-30%

Mw of Capa™ polyols 400-900

Branching of Capa™ polyols 2-3

OH-value of Capa Polyols(mg KOH/g)

135-280

* Cytec

General propertiesExcellent appearance/compatilityGood hardness Excellent chemical resistance

Capa™ in 1K HMMM Flexibility

Significant effect on flexibility due to flexible aliphatic chainsInfluenced by both amount and length of Capa™

0

1

2

3

4

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0 20 30

Capa 2043 Capa 3091

mm

Capa™ Polyols – wt%

Erichsen flexibilityEffect of increasing concentration of Capa™ Polyols

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1

2

3

4

5

400 550 830

mm

Capa™ Diols – Mw (g/mol)

Erichsen flexibilityEffect of Mw of Capa™ Diols (20%)

Capa2043

Capa2054

Capa2085

Capa™ in 1K HMMM Impact resistance

Significant increase of impact resistancedue to flexible aliphatic chains

A winning formula for performance

0

1

2

3

4

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8

9

0 10 20 30

Capa 2043 Capa 3091

Inch

-lbs

Impact resistanceEffect of increasing concentration of Capa™ Polyols

Capa™ Polyols – wt%

Capa™ in 1K HMMM Self healing

Significant improvement of gloss recovery– Semicrystallinity, less internal stress and

viscoelastic properties of cured coating

Method:Scratching: 25 double rubswith scotch briteRecovery: 60 min @ 60 °C

0

10

20

30

40

50

60

0 10 20 30

Capa 2043 Capa 3091

Rel

ativ

e gl

oss

reco

very

(%

)

Gloss recovery -20°CEffect of increasing concentration of Capa™ Polyols

Capa™ Polyols – wt%

Capa™ polyols in coatingsConclusions

100% solids, liquid at room temperature, low viscosity polyols – positive impact on VOC – no compromise on final hardness

Capa™ polyols are aliphatic polyesters – excellent weather resistance

Highly transparent materials with excellent optical properties– perfect compatibility between Capa™ Polyols, acrylics, polyesters

and crosslinkers– positive impact on film appearance (high gloss, low haze)

Flexibility/toughness– outstanding impact resistance and flexibility– best-in-class for abrasion resistance

Selfhealing effect– Good gloss recovery

Thank you for your attention!Please visit us in hall 7A, stand no. 623