Syl-Off ® 91XX Series Thermal-Cure Solventless
Silicone Release Coatings for Films from Dow Corning
Release System Information Guide
Features
• Solvent-free processing
• A variety of cure temperature
options
• Flat release profiles
• Stable release
General Information
Syl-Off ® brand 91XX Series coatings for films are based on 100
percent solids reactive vinyl-functional siloxane polymers:
(Si-CH=CH2)
When combined with their respective crosslinkers and a platinum
catalyst, these coatings cure via an addition reaction in the presence
of heat.
All platinum-catalyzed addition-cure coatings offer fast cure at low
to moderate temperatures. And, within the solventless family, there
is the added advantage of being able to maximize bath life (while
minimizing cure time) within defined temperature ranges. This is
accomplished by inhibiting the catalyst in a controlled manner.
Syl-Off ® thermal-cure solventless silicone release coatings for films
offer premium release and a comparatively fast, low-temperature cure.
Contents
General Information.......................... 1
Product Range Details....................... 2
Product Handling Information.......... 3
Application Information................... 5
Formulation Suggestions................... 9
Physical Properties
Syl-Off 91XX Series coatings are provided in a range of viscosities
suitable for processing with equipment typically used for solventless
silicone coatings. They are clear liquids formulated without catalyst.
Catalyst addition is required.
Applications
• Filmic pressure sensitive laminate/labelstock
• Industrial release films
• Nonstick packaging, including packaging for asphalt and food
• In-line, double-sided and differential release applications
Inhibitor System
Syl-Off 91XX Series coatings are pre-formulated with a controlled
low-temperature inhibitor that offers excellent bath life and facilitates
good low-temperature cure at web temperatures from 80°C (175°F).
Product Range Details
The Syl-Off 91XX Series coatings listed below are available worldwide
and meet the majority of global industry requirements. However, they
represent only a portion of Dow Corning’s silicone release technology.
Contact your Dow Corning representative for information about
additional, locally available product options.
Base Coatings:
2
Syl-Off ® SL 9106
Coating
Cures at standard temperatures. Designed for both off-line and in-line
lamination processes using water-based adhesives. Suitable for coating
polyester substrates at fast line speeds and offers mist control. Excellent
long-term anchorage to a wide range of primed and unprimed films
when combined with Syl-Off ® 9176 Anchorage Additive.
Syl-Off ® SL 9107
Coating
Cures at standard temperatures. Designed for both off-line and in-line
lamination processes using water-based adhesives. Suitable for coating
polyester substrates. Excellent long-term anchorage to a wide range of
primed and unprimed films when combined with Syl-Off ® 9176 Anchorage
Additive.
Syl-Off ® SL 9110
Coating
Low-temperature cure. Designed for coating biaxially oriented
polypropylene, polyethylene and polyethylene-coated kraft.
Syl-Off ® SL 9111
Coating
Low-temperature cure. Suitable for coating biaxially oriented polypropylene
and polyethylene-coated kraft.
Syl-Off ® SL 9112
Coating
Cures at standard temperatures. Good anchorage. Suitable for coating
mono-oriented polypropylene films.
Crosslinkers:
Syl-Off ® 7028
Crosslinker
Suitable for use with most Syl-Off ® non-emulsion coatings.
Recommended where optimum anchorage to substrate is required.
Syl-Off ® 7678
Crosslinker
Recommended where optimum cure performance and bath life are
required.
Syl-Off ® 7689
Crosslinker
Specially developed for use in release coating formulations for polyester
substrates where improved anchorage performance is required.
Syl-Off ® 7682-000
Crosslinker
Recommended where optimum anchorage to substrate and good
cure are required.
Syl-Off ® 7682-055
Crosslinker
Recommended to be used with Syl-Off ® 9106 Coating and Syl-Off ®
9107 Coating where a lower-temperature cure to polyester substrates
is required.
Catalyst:
Syl-Off ® 4000
Catalyst
A reactive organo-platinum complex dispersed in polysiloxane. The
standard catalyst for Syl-Off ® solvent-based and solventless platinumcatalyzed release coatings. Since Syl-Off ® 91XX Series coatings for
films are not pre-catalyzed, the addition of Syl-Off ® 4000 Catalyst is
required to achieve cure.
Release Modifiers:
Syl-Off ® 9151
Release Modifier
Designed to provide a broad range of release modification. For use with
Syl-Off ® SL 9110 Coating, Syl-Off ® SL 9111 Coating and Syl-Off ® SL 9112
Coating. Low-temperature cure performance possible. Good anchorage
to mono-oriented polypropylene films and polyethylene-coated kraft.
Syl-Off ® 9156
Release Modifier
Designed to provide a broad range of release modification. For use with
Syl-Off ® SL 9106 Coating. Good anchorage to polyester films.
Anchorage Additive:
Syl-Off ® SL 9176
Anchorage
Additive
Improves adherence of silicone release coatings to unprimed polyester
and polyolefin films. Minimal impact on cure or release performance.
Suitable for use with all Syl-Off ® 91XX Series silicone release coatings.
Product Handling Information
Substrates
Syl-Off 91XX Series coatings have been successfully applied to
polyolefin film and unprimed polyester.
Corona treatment may be needed to improve anchorage to poly-coated
krafts or polyolefin films.
The suitability of a substrate for use with the chosen release coating
should be evaluated before commercial application.
Application Equipment
Syl-Off 91XX Series coatings are designed to be applied using precision
coating equipment such as three-roll offset differential gravure and
multi-roll smooth roll coaters.
3
Coat Weight
Without experimentation, it is difficult to establish precise recommendations for the correct amount of silicone coating to be deposited
on the substrate. Pickup values are entirely dependent on the coating
equipment used, equipment operation and substrate.
A recommended starting point is 1 g per m2 (0.7 lb per 3,000 sq ft
ream); this can be adjusted to meet substrate and end-use applications.
Coating trials should be conducted for each substrate and coating
formulation used.
Bath Life
The usable bulk bath life is impacted by Pt level, bath temperature and
loss of inhibitor through atmospheric exposure. It is recommended that
formulated coating baths, in general, be used within 4-6 hours.
Bath life varies depending on the coating formulation and the test
method used. Bath life trials should be conducted for each formulation.
Formulation Advice
Crosslinker:Coating Ratio
Good cure can be achieved with crosslinker:coating ratios (calculated
and represented as moles SiH:moles SiVi) typically ranging from 2:1
to 3:1.
Catalyst
Since Syl-Off 91XX Series coatings for films are not pre-catalyzed,
the addition of Syl-Off ® 4000 Catalyst is required to achieve cure.
Consult your Dow Corning Technical Service representative for usage
level information.
High-Release Modifiers
Release modifiers may be added to increase the peel force required to
separate the release liner from the adherent. Actual results will vary
depending on the exact formulation used and other factors such as
adhesive and substrates.
Anchorage Additive
To improve anchorage of silicone coating to difficult filmic substrates,
it is recommended that as a starting point, a level of 0.5 to 2.0 wt% of
Syl-Off ® SL 9176 Anchorage Additive be used in the formulation.
4
Bath Preparation
Equipment should be clean and dry. Stainless steel equipment is
preferred.
The components should be mixed in the following order and stirred
for 20 to 30 minutes (total) to ensure homogeneity:
1.Blend the base release polymer and high-release modifier.
2.Add anchorage additive and stir.
3.Add the crosslinker; stir.
4.Add the catalyst while stirring.
NOTE: The platinum catalyst is sensitive to contamination by
compounds containing nitrogen, sulfur, tin, phosphorus, arsenic,
antimony, selenium or tellurium and by some residual solvents or
monomers. To prevent catalyst poisoning and inhibition of cure,
good coater hygiene must be maintained. A more complete list of
inhibiting compounds is available from Dow Corning.
Application Information
Polyolefin Substrates and Surfaces
Cure Performance
Polymer structure, inhibitor system, time, temperature, type and age
of the substrate, coat weight, and degree of surface penetration can all
affect the cure performance of Syl-Off 91XX Series coatings.
Figures 1 and 2 illustrate the typical cure performance of Syl-Off
91XX Series silicone release coatings on polyolefin substrates and at
different web temperatures. Cure performance is defined in terms of
percent extractables (amount of uncured silicone that can be extracted
from a cured sample).
Figure 1. Effect of web temperature on cure – LDPEK.
12
Extractables, %
10
Exit Web Temp.
8
85°C (185°F)
100°C (212°F)
6
4
2
0
Syl-Off ® SL 9110
Coating
Syl-Off ® SL 9111
Coating
Syl-Off ® SL 9112
Coating
Product
Test conditions: Syl-Off ® 91XX Series coatings applied to LDPEK.
Dwell time: 2.4 seconds.
5
Figure 2. Effect of web temperature on cure – BOPP.
14
Extractables, %
12
Exit Web Temp.
10
85°C (185°F)
8
100°C (212°F)
6
4
2
0
Syl-Off ® SL 9110
Coating
Syl-Off ® SL 9111
Coating
Syl-Off ® SL 9112
Coating
Product
Test conditions: Syl-Off ® 91XX Series coatings applied to 200-gauge UCB OPP.
Dwell time: 2.4 seconds.
Overcoming Cure Inhibition
Some additives used in the manufacture of films and poly-coated
krafts can adversely affect cure.
When using offset roller systems to apply platinum-catalyzed coatings, care should be taken with the choice of the rubber-coated rolls.
Materials used to vulcanize the rubber may inhibit the cure of the
silicone coating.
Release Performance on Polyolefin Substrates
Figure 3 shows the release performance of Syl-Off 91XX Series
silicone release coatings for films.
Figure 3. Release of Syl-Off ® 91XX Series coatings against
acrylic adhesive.
Release Force, cN/25 mm
70
60
50
7 Days
40
30
20
10
0
Syl-Off ® SL 9110
Coating
Syl-Off ® SL 9111
Coating
Syl-Off ® SL 9112
Coating
Product
Test conditions: Syl-Off ® 91XX Series coatings applied to PEK backing. Release
measured against tesa® 7475 acrylic tape. Delamination speed: 0.3 m/min.
6
Polyester Substrates
Cure and Anchorage Performance
Figure 4. Cure performance of Syl-Off ® 9106 Coating system on polyester substrates.
% Extractables
7
6
Syl-Off ® SL 9106 Coating
SiH/Vi 2.6:1
5
Syl-Off ® SL 9106 Coating
SiH/Vi 2.2:1
20% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
4
3
40% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
2
60% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
1
0
1.2 sec 1.2 sec 2.4 sec 2.4 sec
3 sec
3 sec
Cor ON Cor OFF Cor ON Cor OFF Cor ON Cor OFF
Release modifier study with Syl-Off ® 7028 Crosslinker and
120 ppm Pt on Filmquest 2 mil PET; 150°C web temp.
Figure 5. Anchorage performance of Syl-Off ® 9106 Coating system on polyester substrates.
100
% ROR
80
60
40
20
0
1.2 sec 1.2 sec 2.4 sec 2.4 sec 3 sec
3 sec
Cor ON Cor OFF Cor ON Cor OFF Cor ON Cor OFF
Syl-Off ® SL 9106 Coating
SiH/Vi 2.6:1
Syl-Off ® SL 9106 Coating
SiH/Vi 2.2:1
20% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
40% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
60% Syl-Off ® SL 9156
Release Modifier
SiH/Vi 2.2:1
14-day delayed rub-off resistance aged 65°C/85% RH
under water-based acrylic adhesive – release modifier
evaluations; cure: 150°C; web dwell time: 1.2-1.4 seconds.
7
Release Performance of Syl-Off ® 9106 Coating
Figure 6. Modifier performance and release stability against a water-based acrylic adhesive.
7-day
40
Syl-Off ® SL 9106 Coating:
Syl-Off ® 7028 Crosslinker
2.6:1
Syl-Off ® SL 9106 Coating:
Syl-Off ® 7028 Crosslinker
2.2:1
Syl-Off ® SL 9106 Coating/40%
Syl-Off ® 9156 Release Modifier:
Syl-Off ® 7028 Crosslinker
2.2:1
Syl-Off ® SL 9106 Coating/60%
Syl-Off ® 9156 Release Modifier:
Syl-Off ® 7028 Crosslinker
2.2:1
Release force, g/in
35
30
25
20
15
10
5
0
12
400
4,000
12,000
Delamination speed, in/min
7-day release Corona OFF; release modifier formulations
with Syl-Off ® 7028 Crosslinker, 120 ppm Pt.
3-month
50
Syl-Off ® SL 9106 Coating:
Syl-Off ® 7028 Crosslinker
2.6:1
Syl-Off ® SL 9106 Coating:
Syl-Off ® 7028 Crosslinker
2.2:1
Syl-Off ® SL 9106 Coating/40%
Syl-Off ® 9156 Release Modifier:
Syl-Off ® 7028 Crosslinker
2.2:1
Syl-Off ® SL 9106 Coating/60%
Syl-Off ® 9156 Release Modifier:
Syl-Off ® 7028 Crosslinker
2.2:1
Release force, g/in
45
40
35
30
25
20
15
10
5
0
12
400
4,000
12,000
Delamination speed, in/min
3-month release Corona OFF; release modifier formulations
with Syl-Off ® 7028 Crosslinker, 120 ppm Pt.
Food-Contact Information
These products may comply with certain FDA, BfR, Kosher or other
regulatory requirements for food-contact applications. Contact your local
Dow Corning representative for current compliance information.
Limitations
These products are neither tested nor represented as suitable for
medical or pharmaceutical uses.
Health and Environmental Information
To support customers in their product safety needs, Dow Corning has
an extensive Product Stewardship organization and a team of Product
Safety and Regulatory Compliance specialists available in each
geographical area. For further information, please consult your local
Dow Corning representative.
8
Formulation Suggestions
Formulations
Syl-Off 91XX Series thermal-cure solventless silicone release coating
components for films can be combined and adjusted in several ways
to meet various processing and performance challenges. The typical
formulations that follow are intended merely to serve as reference
points for further discussion. Dow Corning does not warrant their
merchantability, fitness for use, performance, efficacy, safety or freedom
from patent infringement. It is your responsibility to thoroughly test
any formulation before use.
For specific formulation advice, contact your Dow Corning Technical
Service representative.
Polyolefin Substrates and Surfaces
Table 1. Typical formulation information.
Formulation
Syl-Off ® SL 9110 Coating
(A) Exceptionally
low-temperature-cure
coating for use on
BOPP
(B) Low-temperaturecure coating for use
on PEK
(C) High-Release
Coating for MOPP
89.4
Syl-Off ® SL 9111 Coating
93.1
Syl-Off ® SL 9112 Coating
54.9
Syl-Off ® SL 9151 Release Modifier
36.6
Syl-Off ® 7678 Crosslinker
8.4
Syl-Off ® 7682-000 Crosslinker
Syl-Off ® 4000 Catalyst
2.2
4.7
6.3
2.2
2.2
Note: Numerical values refer to percent by weight of coating, release modifier or additive as supplied.
9
Polyester Substrates and Surfaces
Table 2. Formulations as a function of release modifier.
With Syl-Off ® 7689 Crosslinker
0%
10%
20%
30%
40%
50%
92.27
81.86
70.93
60
49.07
38.14
Syl-Off SL 9156 Release Modifier
0
10
20
30
40
50
Syl-Off 9176 Anchorage Additive
2
2
2
2
2
2
Syl-Off 7689 Crosslinker
3.42
3.84
4.77
5.69
6.62
7.55
Syl-Off 4000 Catalyst
2.31
2.31
2.31
2.31
2.31
2.31
Syl-Off SL 9106 Coating
®
®
®
®
®
With Syl-Off ® SL 7682-000 Crosslinker, Syl-Off ® SL 7028 Crosslinker or Syl-Off ® SL 7
0%
10%
20%
30%
40%
50%
92.06
81.64
70.66
59.68
48.69
37.71
Syl-Off SL 9156 Release Modifier
0
10
20
30
40
50
Syl-Off 9176 Anchorage Additive
2
2
2
2
2
2
Syl-Off SL 7682-000 Crosslinker,
Syl-Off ® SL 7028 Crosslinker or
Syl-Off ® SL 7048 Crosslinker
3.61
4.05
5.03
6.02
7
7.98
Syl-Off ® 4000 Catalyst
2.31
2.31
2.31
2.31
2.31
2.31
0%
10%
20%
30%
40%
50%
90.88
80.24
68.92
57.6
46.28
34.96
Syl-Off ® SL 9156 Release Modifier
0
10
20
30
40
50
Syl-Off 9176 Anchorage Additive
2
2
2
2
2
2
Syl-Off 7682-055 Crosslinker
4.85
5.45
6.77
8.09
9.41
10.73
Syl-Off 4000 Catalyst
2.31
2.31
2.31
2.31
2.31
2.31
Syl-Off SL 9106 Coating
®
®
®
®
With Syl-Off ® 7682-055 Crosslinker
Syl-Off ® SL 9106 Coating
®
®
®
Note: Numerical values refer to parts (by weight) per 100 parts of coating, release modifier or additive as supplied.
10
60%
70%
80%
27.21
16.28
5.35
60
70
80
2
2
2
8.48
9.41
10.34
2.31
2.31
2.31
7048 Crosslinker
60%
70%
80%
26.73
15.75
4.77
60
70
80
2
2
2
8.96
9.94
10.92
2.31
2.31
2.31
60%
70%
23.64
12.32
60
70
2
2
12.05
13.37
2.31
2.31
11
For Information and
Assistance
For product information, application troubleshooting, product samples and formulation
advice, visit dowcorning.com/psi or call one
of our global Technical Information Centers:
The Americas
+1 800 248 2481
Asia
+86 21 3774 7110
Europe
English +49 (0)611 237 778
German+49 (0)611 237 779
French +49 (0)611 237 773
HANDLING PRECAUTIONS
PRODUCT SAFETY INFORMATION REQUIRED FOR SAFE USE IS NOT INCLUDED IN
THIS DOCUMENT. BEFORE HANDLING, READ PRODUCT AND MATERIAL SAFETY
DATA SHEETS AND CONTAINER LABELS FOR SAFE USE, PHYSICAL AND HEALTH
HAZARD INFORMATION. THE MATERIAL SAFETY DATA SHEET IS AVAILABLE ON THE
DOW CORNING WEBSITE AT DOWCORNING.COM, OR FROM YOUR DOW CORNING
SALES APPLICATION ENGINEER, OR DISTRIBUTOR, OR BY CALLING DOW CORNING
CUSTOMER SERVICE.
LIMITED WARRANTY INFORMATION – PLEASE READ CAREFULLY
The information contained herein is offered in good faith and is believed to be accurate. However,
because conditions and methods of use of our products are beyond our control, this information
should not be used in substitution for customer’s tests to ensure that our products are safe, effective
and fully satisfactory for the intended end use. Suggestions of use shall not be taken as inducements to
infringe any patent.
Dow Corning’s sole warranty is that our products will meet the sales specifications in effect at the
time of shipment.
Your exclusive remedy for breach of such warranty is limited to refund of purchase price or
replacement of any product shown to be other than as warranted.
DOW CORNING SPECIFICALLY DISCLAIMS ANY OTHER EXPRESS OR IMPLIED
WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE OR MERCHANTABILITY.
DOW CORNING DISCLAIMS LIABILITY FOR ANY INCIDENTAL OR CONSEQUENTIAL
DAMAGES.
Dow Corning and Syl-Off are registered trademarks of Dow Corning Corporation.
We help you invent the future is a trademark of Dow Corning Corporation.
All other trademarks are the property of their respective owners.
©2007, 2011, 2012 Dow Corning Corporation. All rights reserved.
Printed in USA
AGP12097m
Form No. 30-1168B-01