Technical Data Sheet PARALOID KM-1 Acrylic Impact Modifier For Weatherable Vinyl Building Applications Regional Product Availability Description Europe PARALOID KM-1 Acrylic Impact Modifier belongs to the new generation of The Dow Chemical Company acrylic impact modifiers (AIMs) designed to outperform existing vinyl additives across a range of processing conditions. This new powder modifier provides outstanding impact and rheological performance properties. This unique combination of properties affords conventional AIMs users the opportunity to switch to PARALOID KM-1 Acrylic Impact Modifier with minor or no adjustment to existing formulations. In addition, the core shell structure of this new modifier has been designed to offer an improved impact strength efficiency satisfying all standards, across a range of processing conditions. Key Attributes Impact Strength Key properties provided by PARALOID KM-1 Acrylic Impact Modifier are as follows: No stress built-up Consistent surface finish (Gloss) Low post-extrusion shrinkage Reduced or no plate-out High impact strength Good resistance to compaction Unparalleled weathering performance EN12608 STANDARD (ISO 179-1/1eA) Impact strength under plane strain conditions is regarded as a reliable indicator of brittleness for a given formulation, following a linear elastic fracture mechanism on pressed plate. This property is customarily measured with the Single V-notch Impact test (ISO 179-1/1eA). To pass the test, a calendered/pressed formulation must withstand a minimum energy of 20 kj/m². Results conducted with this procedure demonstrate that PARALOID KM-1 Acrylic Impact Modifier provides improved impact strength under plane strain conditions. As shown in the graph on the following page, PARALOID KM-1 Acrylic Impact Modifier at 6 or 7 phr displays similar or superior impact effectiveness as other acrylic impact modifiers (Fig. 1). Page 1 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
Impact Strength (continued) Figure 1: EN 12608 Standard RAL STANDARD (DIN 53753: Double V-notch Charpy impact test) In some countries, reference is made to the RAL-GZ 716/1 Standard. This RAL Standard specifies the use of a double-v notch Charpy impact test (DIN 53753) to measure the impact strength of extruded vinyl profiles under plane stress conditions. A minimum energy of 40 kj/m² is necessary to satisfy the Standard s requirements in this regard. Evaluations conducted with this procedure confirm the good efficiency of PARALOID KM-1 Acrylic Impact Modifier relative to competitive modifiers (Fig. 2). At low level, PARALOID KM-1 Acrylic Impact Modifier provides enough impact resistance to satisfy the standard. Figure 2: RAL standard Process Characteristics Brabender Rheology PARALOID KM-1 Acrylic Impact Modifier yields a slightly slower fusion but similar fusion temperature, compared to conventional AIMs. Equilibrium torque is comparable to conventional AIMs (Figure 3). This feature was ascertained in Brabender rheology testing conducted at 180 C and 50 rpm with a charge weight of 59 grams. Figure 3: Brabender Rheology Data Pb stabilized formulation Loading phr Fusion time (sec.) Fusion Temp ºC Fusion Torque (nm) Competitive AIM 6 72 166 16.7 31.6 PARALOID KM-1 6 77 166 20.2 31.5 Equilibrium Torque (nm) Page 2 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
Extrusion Processing Characteristics In trials conducted with large parallel or conical twin-screw extruders, vinyl formulations containing PARALOID KM-1 Acrylic Impact Modifier exhibit processing characteristics similar or slightly delayed fusion to vinyl formulated with conventional AIMs (Fig. 4). These extruder data reflects the slightly slower fusion observed for PARALOID KM-1 Acrylic Impact Modifier in a Brabender test. Figure 4: Extrusion Characteristics Pb stabilized formulation Loading phr Density g/cc Screw Torque A Melt Pressure Z1 MPa Competitive AIM 6 0.671 3.59 1.1 169 PARALOID KM-1 6 0.673 3.43 0.7 166 Competitive AIM 7 0.668 3.64 1.3 171 PARALOID KM-1 7 0.671 3.58 1.0 170 Melt Temp. ºC Gloss Properties As a result of the outstanding rheological and impact properties described above, PARALOID KM-1 Acrylic Impact Modifier based formulations delivers very good gloss to vinyl profiles (Fig. 5) compared to competitive AIMs. Figure 5: 60 Gloss Percentage Page 3 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
Color Properties As slight temperature adjustment could be required to optimize the PARALOID KM-1 Acrylic Impact Modifier efficiency in vinyl profiles, color characteristics remains fully comparable to competitive modifiers (Fig. 6). Figure 6: b* value Weatherability The weathering resistance of vinyl depends on a number of factors in the formulation, notably the polymer grade, the chemical type and concentration of the stabilizer, and the nature of the pigmentation. All acrylic polymers, specially developed by The Dow Chemical Company for vinyl impact modification, have proven their outstanding weathering resistance and color stability over many years. Rigid vinyl products, when properly stabilized, pigmented and modified with PARALOID acrylic impact modifiers, show excellent color durability and retention of mechanical properties. Accelerated weathering tests were carried out with a Xenontest weatherometer for 4000 hours. The tests were performed on window profiles in a Pb stabilized vinyl formulation. The results highlight the excellent long-term durability of PARALOID KM-1 Acrylic Impact Modifier (Fig. 7 and 8). Figure 7: Color Stability (Delta b*) Page 4 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
Figure 8: Color Stability (Delta E*) Packaging and Handling Packaging Powder Characteristics PARALOID KM-1 Acrylic Impact Modifier Funnel flowability, mm 20 Minimum ignition energy, mj 200 300 Minimum ignition temperature, ºC 420 Layer ignition temperature, ºC > 400 KST Class/Value (bar.m/s) Class 1 / 120 Particle size: On 0.600 mm, maximum 7 On 0.250 mm, maximum 60 Trough 0.045 mm, maximum 25 Handling Considerations Under certain conditions all organic powders can form explosive mixtures with air. PARALOID KM-1 Acrylic Impact Modifier is no different in this respect and has been classified as belonging to the dust explosion class ST1. Risks of this nature can be minimized by careful plant design. To ensure safe handling, the appropriate safety regulations should be observed. We recommend that the prospective users determine the safe handling procedures necessary for the user s applications before manufacturing products. A Material Data Safety Sheet, outlining hazards and handling methods, is available on request from your local Dow Chemical Plastics Additives sales office. Page 5 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
Formulations Window Profile Ca/Zn Stabilized (K68) S-PVC K68 100 Ca/Zn-Stabilizerpack 4 6 Titanium Dioxide 5 Calcium Carbonate 5 8 PARALOID KM-1 6.0 PARALOID K-125 ER 0.5 Window Profile Pb Stabilized (K68) S-PVC K68 100 Pb-Stabilizerpack 4 6 Titanium Dioxide 4 Calcium Carbonate 5 8 PARALOID KM-1 6.0 PARALOID K-175 ER 0.5 PARALOID K-125 ER 0.5 Handling Precautions Before using this product, consult the Material Safety Data Sheet (MSDS)/Safety Data Sheet (SDS) for details on product hazards, recommended handling precautions and product storage. CAUTION! Keep combustible and/or flammable products and their vapors away from heat, sparks, flames and other sources of ignition including static discharge. Processing or operating at temperatures near or above product flashpoint may pose a fire hazard. Use appropriate grounding and bonding techniques to manage static discharge hazards. CAUTION! Failure to maintain proper volume level when using immersion heaters can expose tank and solution to excessive heat resulting in a possible combustion hazard, particularly when plastic tanks are used. Storage Disposal Store products in tightly closed original containers at temperatures recommended on the product label. Dispose in accordance with all local, state (provincial) and federal regulations. Empty containers may contain hazardous residues. This material and its container must be disposed in a safe and legal manner. It is the user's responsibility to verify that treatment and disposal procedures comply with local, state (provincial) and federal regulations. Contact your Dow Plastics Additives Technical Representative for more information Page 6 of 7 PARALOID KM-1 Acrylic Impact Modifier / Dow Plastics Additives Form No. 874-00921-0810
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