SOLVENT FREE DEHESIVE® SYSTEMS FOR ... - aws …

1 CREATING TOMOROW S SOLUTIONS COATINGS I dehesive SYSTEMS I APPLICATION 1 SOLVENT free dehesive SYSTEMS FOR PAPER LINERS. Applications Paper accounts for the bulk of material used as base for release liner. Glassine and calendered kraft papers have the highest share and are particularly used for label stock and some tape constructions. Clay coated kraft papers are mainly found in the sheet-fed label stock and graphic arts market. Processing Silicone release SYSTEMS , used in coating paper liners, not only have to address the required release criteria, but also have to meet special processing parameters associated with paper, such as fast cure at 130 140 C web temperature to minimize remoistening and guarantee good lay flat properties excellent anchorage in combination with fast cure crosslinkers to minimize catalyst consumption good flow out properties to achieve good coverage at low coat weights Silicone Products WACKER SILICONES offers a range of SOLVENT free dehesive products especially suitable for paper release liner coating at standard line speeds.

2 WACKER has a proven solution to control mist effectively for high speed coating processes. dehesive 920 combines excellent bulk-pot life and low release force at low peel speeds with excellent release stability in combination with a wide range of adhesives. dehesive 909 combines low release force at low peel speeds with excellent release stability in combination with a wide range of adhesives. dehesive 910 combines low release force at low peel speeds with fast cure properties. dehesive 924 combines excellent bulk-pot life and a moderately flat release profile with very fast cure properties. dehesive 919 combines a moderately flat release profile with very fast cure properties. dehesive 915 combines a flat release profile with extremely fast cure properties and good flow out.

3 dehesive 971 combines a very flat release profile with ultra-fast cure properties and excellent flow out. Combination of these dehesive polymers with CROSSLINKER V 90 provides very fast cure with good anchorage. It is preferably used with glassine, supercalendered kraft papers and most types of clay coated paper. CROSSLINKER V 88 combines fast cure with excellent anchorage. It is recommended to use with supercalendered kraft papers and some types of clay coated paper and provides moderate anchorage properties. It is also used with glassine in combination with high CRA formulations. CROSSLINKER V 24 provides optimum anchorage. It is preferably used with paper providing moderate anchorage properties.

4 CATALYST OL is used at a level of to to catalyze cure of dehesive polymer and CROSSLINKER at typical cure conditions used in paper release coating. CATALYST C 05 is used at a level of 3 to 9% to catalyze cure. CREATING TOMOROW S SOLUTIONS COATINGS I dehesive SYSTEMS I APPLICATION 2 Re le as e the id ea l p e rfo rma nc e . Controlled Release Additives WACKER SILICONES offers a range of SOLVENT free CRA products that differ in type and amount of MQ-resin used and type of diluent. CRA 17 is an extremely efficient controlled release additive for adjusting the release force of solventless dehesive SYSTEMS . CRA 17 can be used to obtain the highest release values of all CRA modifiers.

5 CRA 37 is an extremely efficient controlled release additive for adjusting the release force of SOLVENT - free dehesive SYSTEMS . CRA 42 is an extremely efficient controlled release additive for adjusting the release force of SOLVENT - free dehesive SYSTEMS . dehesive Release SYSTEMS Silicone release coating components can be combined and adjusted to meet various processing and performance challenges. Release performance with a typical acrylate and rubber adhesive is given in figures 1 and 2. As a special feature in release liner production, release stability of the liner and release stability of the final laminate have to be considered when choosing a specific silicone formulation. Typical formulations for coating paper have been included as reference points.

6 Formulation 1 combines low release force at low peel speeds with excellent release stability in combination with a wide range of adhesives. It is typically used as easy release coating in double-sided tape applications. parts dehesive 920 parts CROSSLINKER V 90 parts CATALYST OL Formulation 2 combines a flat release profile with extremely fast cure properties and good flow out. It is used to improve conversion speeds and to reduce coat weight on papers having excellent hold out. pts dehesive 915 pts CROSSLINKER V 88 pts CATALYST OL Formulation 3 combines a very flat release profile with ultra-fast cure properties and excellent flow out. It is used to maximize conversion speeds and minimize platinum use.

7 Pts dehesive 971 pts CROSSLINKER V 90 pts CATALYST OL Release Profile with TESA A 7475 Release Profile with TESA K 7476 051015200,310,0300,0 Release Force [cN/cm]Delamination Speed[m/min] Formulation 1: DEH 920 / V 90 Formulation 2: DEH 915 / V 90 Formulation 3: DEH 971 / V 90 Figure 2: Release performance with a typical rubber adhesive 10152025300,310,0300,0 Release Force [cN/cm]Delamination Speed[m/min] Formulation 1: DEH 920 / V 90 Formulation 2: DEH 915 / V 90 Formulation 3: DEH 971 / V 90 Figure 1: Release performance with a typical acrylate adhesive CREATING TOMOROW S SOLUTIONS COATINGS I dehesive SYSTEMS I APPLICATION 3 De s ign yo u r in d ivid ua l s ys te m.

8 Performance Data Cure performance was tested on WACKER s pilot coater, using a 5-roll coating head and an air flotation oven. Cure performance is defined in terms of percent extractables (amount of uncured silicone that can be extracted from a cured sample). Cure performance is shown in Figure 3 for Formulations 1 3 with a variation in the amount of catalyst used. Formulation Services WACKER s pilot coating and application testing services can help you determine how a particular silicone release coating formulation will coat, cure and perform on your substrate under a variety of process conditions. For specific formulation advice regarding your individual processing conditions and release targets, contact your WACKER Technical Service representative.

9 Additional Information For further information on WACKER products consult the individual Tech-nical Data Sheets. For additional information on options for design of your system , consult WACKER Technical Information on CONTROLLED RELEASE SOLVENT free dehesive SYSTEMS FOR HIGH SPEED COATING PILOT COATING SERVICES Cure Performance at 145 C Exit Web Temperature Figure 3: Cure performance at various catalyst levels 036920406080 Extractable Silicone [%]]ppm Platinum Formulation 1: DEH 920 / V 90 Formulation 2: DEH 915 / V 90 Formulation 3: DEH 971 / V 90 CREATING TOMOROW S SOLUTIONS COATINGS I dehesive SYSTEMS I APPLICATION 4 SOLVENT free dehesive PRODUCTS FOR PAPER COATING dehesive POLYMER dehesive 920 good cure properties rising release profile Excellent bulk-pot life dehesive 909 good cure properties rising release profile dehesive 910 fast cure properties moderately rising release profile Excellent bulk-pot life dehesive 924 very fast cure properties moderately flat release profile Excellent bulk-pot life dehesive 919 very fast cure properties moderately flat release profile dehesive 915 excellent fast cure properties flat release profile dehesive 971 ultra-fast cure properties very flat release profile

10 CROSSLINKER CROSSLINKER V 90 very fast cure good anchorage CROSSLINKER V 88 fast cure excellent anchorage CROSSLINKER V 24 optimum anchorage CATALYST CATALYST OL very efficient platinum catalyst CATALYST C 05 diluted platinum catalyst easy to use with mixing and metering machines RELEASE MODIFIER CRA 17 highest efficiency reactive olefin CRA 37 standard low VOC product reactive silicone CRA 42 for low temperature cure reactive silicone AMA , CRA and dehesive are registered trademarks of Wacker Chemie AG. Wacker Chemie AG, Hanns-Seidel-Platz 4, 81737 M nchen, Germany, The data presented in this brochure are in accordance with the present state of our knowledge, but do not absolve the user from carefully checking all supplies immediately upon receipt.