Eastman - GN-408 - Chlorinated Polyolefin Brochure

1How to use Eastman™ CPOs as adhesion promotersChlorinated polyolefins serve as adhesion promoters in at least three ways:• As a primer between the substrate and subsequent coatings. • As a primer or tie-coat between coating layers. • As an additive to paint or ink.Eastman™ chlorinated polyolefins (CPOs) are widely used as adhesion promoters for coatings and inks on polyolefin plastics because conventional coatings do not adhere well to untreated polyethylene, polypropylene, or polypropylene/elastomer blends such as TPOs (thermoplastic olefin alloy).The successful use of Eastman CPO as a separate primer step depends on the proper combination of substrate, CPO type, film thickness, and coating system applied over the CPO film. As noted in the following table, some CPOs are designed to promote adhesion to polyethylene, while others work well with polypropylene and other substrates. CPO is usually spray-applied as a thin mist coat having up to 5 wt% solids and allowed to flash dry thoroughly prior to application of other primers or topcoats. Thick CPO films often result in poor adhesion properties. Blending or modifying resins can be used in combination with CPOs to alter overall adhesion properties of the system. Refer to Eastman publication GN-424 for modifying resins. Application steps1. Clean substrate of all contamination (such as dirt, oil, grease, and mold release agents) with isopropyl alcohol or other appropriate cleaning solution. Dry thoroughly after cleaning. 2. Prepare CPO primers at 5% solids and apply 0.1–0.2 mil (dry film thickness) by spraying, wiping, or other means. Typical primer formulations are found in Eastman publication GN-424. 3. Topcoats or other primers may be applied immediately after the CPO primer coating has dried, usually within 2–3 minutes at temperatures above 21°C (70°F). 4. With coatings such as two-part urethane enamels on polypropylene, a modifying resin may be added to the CPO primer for better adhesion. Ethylene vinyl acetate (EVA) copolymers have been found to improve primer performance under these topcoats.Substrate Use as primer Use as additivePolyethylene CP 153-2 —Polypropylene CP 730-1, CP 343-1, or CP 164-1 CP 343-3 or CP 515-2TPO CP 730-1, CP 343-1, or CP 164-1 CP 343-3 or CP 515-2Aluminum CP 730-1, CP 343-1, or CP 164-1 CP 343-3 or CP 515-2Galvanized steel CP 730-1, CP 343-1, or CP 164-1 CP 343-3 or CP 515-2Guidelines for applying Eastman™ CPOs as primers22How to use Eastman™ CPOs as adhesion promoters (Continued}Guidelines for using Eastman™ CPOs as additivesGenerally, the best overall adhesion is obtained by applying CPO directly to the substrate as a primer, followed by a color coat or other primers. However, in some cases CPOs can be used as additives to avoid an extra priming step. In other cases this may not be possible due to incompatibility with some resins and solvents in color coats and primers, especially at high CPO concentrations. The formulator must decide if the additive approach is feasible for a specific application.The successful use of Eastman™ CPO as an additive depends on the proper combination of substrate, CPO type and level, topcoat, and system compatibility. The CPO should be tested for compatibility with the paint, coating, or ink being used. Various levels of the selected CPO should be tested in the paint, coating, or ink system since the adhesion-promoting properties of CPOs are often diluted when combined with other film formers.Application steps1. Clean substrate of all contamination (such as dirt, oil, grease, and mold release agents) with isopropyl alcohol or other appropriate cleaning solution. Dry thoroughly after cleaning. 2. Add 2.5% CPO solids to the unreduced paint or ink as shown in the following example and mix thoroughly. 3. Test for compatibility or effect on dry film properties. 4. If adequate adhesion is not obtained with this suggested starting level, increase the amount of CPO until adhesion is obtained. Monitor any effects on other dry film properties. Refer to Eastman publication GN-424 for more details. Guidelines for using waterborne CPOsWaterborne CPO dispersions CP 310W, CP 347W, and CP 349W can be used as primers or additives to water-reducible paints or inks. Waterborne CPO primers may also be used with solventborne topcoats. The same guidelines for using the solventborne CPOs are true for waterborne CPOs with the following exceptions:• Waterborne CPO primers are generally applied at 8%–10% solids. • For spray applications, the gun pressure should be adjusted to properly atomize the waterborne CPO.• Waterborne primers may need to be dried in an oven or by other means before subsequent coats are applied. Additional information on formulating with CPO dispersions can be found in Eastman publications GN-411 and GN-425.Wt%CP 343-3 (25% NV) 10Paint or ink 100Eastman Chemical CompanyCorporate HeadquartersP.O. Box 431Kingsport, TN 37662-5280 U.S.A.Telephone:U.S.A. and Canada, 800-EASTMAN (800-327-8626)Other Locations, (1) 423-229-2000Fax: (1) 423-229-1193Eastman Chemical Latin America9155 South Dadeland Blvd.Suite 1116Miami, FL 33156 U.S.A.Telephone: (1) 305-671-2800Fax: (1) 305-671-2805Eastman Chemical B.V.Fascinatio Boulevard 602-6142909 VA Capelle aan den IJsselThe NetherlandsTelephone: (31) 10 2402 111Fax: (31) 10 2402 100Eastman (Shanghai) Chemical Commercial Company, Ltd. Jingan Branch1206, CITIC SquareNo. 1168 Nanjing Road (W)Shanghai 200041, P.R. ChinaTelephone: (86) 21 6120-8700Fax: (86) 21 5213-5255Eastman Chemical Japan Ltd.MetLife Aoyama Building 5F2-11-16 Minami AoyamaMinato-ku, Tokyo 107-0062 JapanTelephone: (81) 3-3475-9510Fax: (81) 3-3475-9515Eastman Chemical Asia Pacific Pte. Ltd.#05-04 Winsland House3 Killiney RoadSingapore 239519 Telephone: (65) 6831-3100Fax: (65) 6732-4930www.eastman.comGN-408C 4/13Although the information and recommendations set forth herein are presented in good faith, Eastman Chemical Company makes no representations or warranties as to the completeness or accuracy thereof. You must make your own determination of their suitability and completeness for your own use, for the protection of the environment, and for the health and safety of your employees and purchasers of your products. Nothing contained herein is to be construed as a recommendation to use any product, process, equipment, or formulation in conflict with any patent, and we make no representations or warranties, express or implied, that the use thereof will not infringe any patent. NO REPRESENTATIONS OR WARRANTIES, EITHER EXPRESS OR IMPLIED, OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR OF ANY OTHER NATURE ARE MADE HEREUNDER WITH RESPECT TO INFORMATION OR THE PRODUCT TO WHICH INFORMATION REFERS AND NOTHING HEREIN WAIVES ANY OF THE SELLER’S CONDITIONS OF SALE. Material Safety Data Sheets providing safety precautions that should be observed when handling and storing our products are available online or by request. You should obtain and review available material safety information before handling our products. If any materials mentioned are not our products, appropriate industrial hygiene and other safety precautions recommended by their manufacturers should be observed. © 2013 Eastman Chemical Company. Eastman is a trademark of Eastman Chemical Company.