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Non-Sag Additives for Adhesives and Sealants

SpecialChem / Edward Petrie – Jan 22, 2003

rheology of adhesiveTo insure that adhesives and sealants function well during their application and end-use, the formulator must be able to control the flow properties of the product. The challenge that the formulator faces is that the adhesive or sealant may need different flow characteristics at different times.

Adhesive and sealant manufacturers employ rheological additives for thickening and to prevent sag of their products. In practice, rheological additives may provide benefits in addition to viscosity or flow control. When properly formulated into adhesives and sealants, rheological additives improve several properties of the formulation.

In practice, formulators have a variety of additives available to manipulate these properties. This article will review this technology with the emphasis on the development of non-sag or thixotropic products. However, certain "thickening agents" that are not classical thixotropes will also be discussed.

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