High-Performance Materials for Laminating Adhesives

High-Performance Materials for Laminating Adhesives

Laminating Adhesives

Technology Types:

!  Solventborne

!  Waterborne

!  Solventless (100% solids, 2K or 1K)

!  Hotmelt

!  UV/EB Curable

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Laminating adhesive: An adhesive layer to bond two substrates together.

Processes:

!  Dry Processes

•  UV Laminating Process

!  Wet Processes

•  EB Laminating Process

!  Co-extrusion Process

UV/EB Adhesive Laminating Process

UV Adhesive Lamination: •  High line speed •  Low VOC

EB Adhesive Lamination: •  No heat generation •  Will cure through opaque films

Rewind Secondary Unwind Station Primary Unwind

Station Coater

Electron Beam

UV Lamp

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Markets and Applications

Food Packaging and Consumer Goods

Photovoltaic

Medical Automobile

Electronics

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Performance Requirements

General Applications:

!  Initial bond strength

!  Ultimate bond strength

!  Resistance to service environment (heat, humidity, electric)

Special Applications:

!  High optical clarity

!  Electrical insulation (low dielectric constant, high breakdown voltage)

!  Gas permeability (moisture, oxygen, etc.)

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Scope of this Study

!  Typical Formulation of UV/EB Curable

Laminating Adhesives

Components Level

Oligomers 40% to 70%

Monomers 70% to 30%

Photoinitiators 1% to 3%

!  New Oligomer Development

Products Type of Oligomers Viscosity at

60°C, cps Color

CN9018 Polyether UA 20,000 <100 APHA

CN966J75 Polyester UA 4500 <100 APHA

PRO12184 Polyester UA, High molecular weight

16,000 <100 APHA

PRO12507 Tin-free polyester UA 15,500 <100 APHA

NTX12321 Allophonate 41,000 <120 APHA

NTX11945 Bio-based UA 12,000 <120 APHA

NTX12514 Moisture-resistant polyester UA

5600 <150 APHA

NTX12427 Polyvinyl Acetal 25,000 <150 APHA

NTX12585 Polycaprolactone UA 22,800 <120APHA

PRO12384 Polycarbonate UA 26,000 <100 APHA

PRO12546 Polycarbonate UA 22,500 <100 APHA

PRO12599 Polycarbonate UA, High molecular weight

80,400 <100 APHA

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Physical Properties

Products Tensile Strength (PSI) Elongation Tg, by Tan

Delta CN966J75

430 238 31 NTX12321

122 260 -21 NTX11945

668 165 -19 NTX12514

111 103 -16 NTX12427-29B -4 1527 24

NTX12585 314 157 -16

PRO12384 952 289 -6

PRO12546 755 360 -12

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Key Performance Evaluated

!  Sample Preparation ●  Each oligomer was formulated using Sartomer’s standard adhesive formulation

package. ●  The adhesives were laminated between DuPont (XST-6578) PET films. ●  Curing condition: Under a Fusion 600 W/in D lamp at a speed of 15 fpm. ●  Thickness of each adhesive sample: Tested to be approximately 9 mils.

!  Application Property Test •  Initial bond strength: Instron •  Initial optical clarity: UV/Vis spectra •  Ultimate bond strength and optical clarity under different weathering conditions:

•  ASTM D4329-05 cycle B QUV •  85°C/85% relative humidity •  Freeze-thaw cycles (each cycle includes 20 hours at 85°C/85% relative

humidity and 2 hours at -40°C) •  The weathering samples were equilibrated at RT/50% relative humidity

environment for seven days before T-peel testing.

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Initial Optical Clarity

All the adhesives are optically clear 9

Optical Clarity After 500 Hours QUV Weathering

All the materials kept optical clarity 10

Optical Clarity After 500 Hours 85°/85% Relative Humidity Weathering

High molecular weight polyester and polycarbonate urethane acrylates began to lose optical clarity.

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Optical Clarity After 500 Hours Freeze-Thaw Cycles

Polyester urethane acrylates CN966J75, PRO12184, PRO12507 and polycarbonate urethane acrylate NTX12599 lost optical clarity.

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Change in Bond Strength After 500 Hours Weathering

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!   Polyester, polycaprolactone and polycarbonate urethane acrylates demonstrate high initial bond strength. Polyether urethane acrylate shows weak initial bond strength.

!   Most polyester, polycaprolactone urethane acrylates lost bond strength. Polyether urethane acrylates can hold bond strength.


!  NTX12514 (Polyester UA) and PRO12546 (Polycarbonate UA) still exhibit high bond strength after all three weathering tests.


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Optical Clarity After 2000 Hours QUV

!  CN9018, polyether urethane acrylate lost optical clarity after 2000 hours QUV.

!  Only five products kept optical clarity after 1000 hours weathering.

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Optical Clarity After 2000 Hours Freeze-Thaw Cycles

!  All five products survived 2000 hour 85°C/85% R.H. and freeze-thaw weathering

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Feature Products- Change in Bond Strength With Aging Time

!  PRO12546-Polycarbonate urethane acrylate

!  NTX12514-Polyester urethane acrylate

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Conclusions

!  Polyester urethane acrylates can be designed to have superior durability even under harsh weathering conditions.

!  Not all the polycarbonate urethane acrylates can deliver high durability. Specific composition and molecular weight do matter.

!  NTX12514 and PRO12546 are featured products for laminating adhesive applications requiring:

●  Strong initial bond strength

●  High optical clarity

●  Maintenance of high optical clarity and bond strength under different weathering environments

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For more information:

www.sartomer.com

[email protected]

(800) SARTOMER

(610) 363-4100

@SartomerGlobal on Twitter

Thank you

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Science

High-Performance Materials for Laminating Adhesives