Quality Adhesives made with Specialty Minerals Products
Functional filler and extender minerals from Specialty Minerals Inc. (SMI) maximize performance and minimize costs of adhesive products, whether solvent-based, water-based, 100-percent solids reactive, or hot melt. Precipitated calcium carbonates (PCCs), ground calcium carbonates (GCCs), dolomites and talcs, in a range of particle sizes from 0.06 microns to 20 microns or more, offer perfect options for your adhesive formulation.
In addition to reducing costs by replacing polymers and other expensive raw materials in a product, SMI minerals add performance through their functionalities—properties such as rheological control, opacity and brightness, weatherability, crack reduction and sound absorption.
SMI minerals are used in epoxy, urethane, acrylic, cyanoacrylate, butyl, polyisobutylene, and other rubber-based non-aqueous adhesives, as well as in a variety of hot melt adhesives, including those based on ethylene-vinyl acetates (EVA), styrene block copolymers, and polyisobutylene. A range of water-based adhesives benefit from the use of SMI minerals including acrylics, vinyl acetates, polyvinyl alcohols, ethylene-vinyl acetates (EVA), phenolics, SBRs (styrene butadiene rubbers) and carboxylated SBRs, acrylonitriles, and those based on natural resins. Construction, packaging, automotive, electrical, appliance, and product assembly are some of the end uses for adhesives that contain SMI products.
Specialty Minerals Precipitated Calcium Carbonates for Adhesives
When used at moderate to high loadings, 10 percent or more, PCCs build an internal, shear thinning structure that provides rheological control. PCCs not only thicken but also impart thixotropic viscosity, yield value, sag and slump resistance, control of spraying, extrusion or other application method. They can be used as the sole rheological additive or can replace part of a more expensive thixotrope. In addition, PCCs reinforce the polymer by strengthening the adhesive. For rheology and reinforcement, the finer the PCC particle, the greater the effect. SMI PCCs come in both uncoated hydrophilic grades and coated hydrophobic grades and in sizes from true nano particles of 0.06 microns up to a few microns. Coating, usually with stearic acid, increases dispersibility, compatibility and efficiency of the PCC in solvent-borne or 100 percent solids organic systems and can reduce pre-curing in moisture sensitive products, such as urethanes. The uncoated grades can be used in aqueous and non-aqueous adhesives.
Specialty Minerals manufactures PCCs for adhesives in two locations. In the U.S., Ultra-Pflex®, Thixo-Carb®, Super-Pflex®, Albafil® and Albacar® families of PCCs are produced in Adams, Massachusetts. In the U.K., the Calofort®, Calopake® and Multifex-MM® PCCs are produced in Birmingham. They are available for sale throughout the world.
Click here to read more about SMI’s PCCs for adhesives and sealants.
Specialty Minerals Ground Calcium Carbonates and Dolomites
GCCs are the most common filler used in adhesives, with the best balance of economy, brightness and physical properties. They add non-thixotropic viscosity to the adhesive, with greater viscosity coming from the smaller 3.5 micron products. Higher loadings, without excessive viscosity build, result from using larger particles, up to 20 microns. Often a blend of two or three different particle-sized GCCs are used because the particles will pack better and permit increasing the filler loading. Dolomites (calcium magnesium carbonates) are also used in adhesives. Dolomites generally have a lower oil absorption than a GCC of the same size, which allows higher loadings. However, dolomites have lower brightness than GCCs.
GCCs, namely Vicron® and Marblewhite®, are produced in SMI’s plants in Adams, Massachusetts. Dolocron® dolomites come from SMI’s plant in Canaan, Connecticut.
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Specialty Minerals Talcs for Adhesives
While talc can be added to adhesives for cost reduction, it is more often included to take advantage of its unique properties. Talcs are platy, so they reinforce and add stiffness. Talcs are naturally hydrophobic and chemically inert, so they will improve water resistance, chemical resistance and general weatherability. As with GCCs, talcs will increase the non-thixotropic viscosity of the adhesive. Products containing talc have improved sandability and result in smooth finishes.
Talc grades as small as 0.8 microns are produced by SMI, but adhesive applications will tend to use products in the 1.5 to 8 micron range. The use in formulations of a blend of several different particle-sized grades for improved particle packing and higher loadings are also possible with talcs.
Specialty Minerals mines and manufactures Talcron®, Sericron® and MicroTuff® talcs for adhesives in Barretts, Montana.
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All of SMI’s PCC, GCC, dolomite and talc products are manufactured in facilities that are ISO 9001 certified and where process control and quality assurance results in high quality, consistent products.