Skip to content

AMCOL International Corporation

A former U.S.-listed specialty materials company that mined, processed, and distributed industrial minerals, clays, and related chemical products.

Last updated August 26, 2026

AI crawler reads

No AI crawler has read this profile since Oct 28, 2026.

Overview

AMCOL International Corporation was a United States-based specialty materials and industrial-minerals company headquartered in Hoffman Estates, Illinois. Its activities included mining, processing, and distributing mineral-based and chemical products for industrial and commercial customers. The company was associated particularly with bentonite, absorbent minerals, performance clays, and other materials whose physical or chemical characteristics could be adapted to specific applications. AMCOL’s business was primarily business-to-business rather than consumer-facing. Its materials were used in areas including foundry operations, commercial construction, environmental engineering, drilling, agriculture, pet-care products, and other industrial applications. One identified construction-related use was the supply of clays intended to function as moisture barriers in commercial building systems. The company’s broader portfolio was based on properties such as swelling, sealing, absorption, thickening, barrier formation, and binding. The company’s corporate history ended as an independent public-company story in 2014. On February 14, 2014, AMCOL announced a merger agreement with Imerys. That transaction did not proceed after Minerals Technologies Inc. made a competing offer, which AMCOL’s board regarded as superior. Minerals Technologies subsequently acquired all outstanding shares of AMCOL on May 9, 2014. After the transaction, AMCOL was no longer independently traded on the New York Stock Exchange, and its operations became part of Minerals Technologies’ broader minerals business. Because AMCOL is now a former independent company, publicly available information is more complete for the 2014 transaction than for its entire earlier operating history. The available reference material does not establish a reliable founding year, founder, complete executive succession, detailed annual product-brand architecture, or a comprehensive geographic sales breakdown. Accordingly, this entry describes the company at the level supported by the available corporate and reference sources and does not attribute unverified brands, financial results, or management names to it.

History

AMCOL International Corporation was a specialty materials company based in Hoffman Estates, Illinois. Its business combined mineral extraction, processing, and distribution with the sale of chemical and mineral products designed for defined industrial and commercial uses. The company was not principally organized as a mass-market consumer brand; instead, its role was that of a materials supplier serving customers whose manufacturing, construction, engineering, or product-formulation requirements depended on particular mineral properties. The best-supported description of AMCOL’s portfolio centers on bentonite, clays, absorbents, and related performance minerals. These materials can provide functions such as swelling, sealing, absorption, binding, thickening, or moisture control. AMCOL’s identified applications included foundry work, commercial construction, environmental engineering, drilling, agriculture, pet care, and other industrial markets. Its construction activities included clays used as moisture barriers in commercial buildings. The range of applications indicates a diversified industrial-minerals model, in which the same broad resource base could support different end markets through processing, formulation, and application-specific distribution. The available reference material does not provide a dependable founding date or a complete narrative of the company’s early development. It also does not establish a full list of historical subsidiaries, product trademarks, plant locations, chief executives, or regional revenue contributions. Those omissions are important because AMCOL’s identity was primarily corporate and operational: many of its materials were likely sold into industrial supply chains rather than promoted to consumers under a single widely recognized brand. The company is therefore best understood through its capabilities in mining, mineral processing, specialty materials, and market-specific applications. A significant turning point came in 2014. On February 14, AMCOL announced that it had signed a merger agreement with Imerys. The proposed combination was subsequently terminated after Minerals Technologies Inc., a New York-based international minerals supplier, made a rival offer. AMCOL treated the Minerals Technologies proposal as superior, leading to the termination of the earlier Imerys agreement and the progression of the competing transaction. Minerals Technologies completed its acquisition of all outstanding AMCOL shares on May 9, 2014. The acquisition ended AMCOL’s status as an independent public company. Before the transaction, AMCOL had been traded on the New York Stock Exchange; after completion, its shares were no longer independently traded, and the company’s operations were incorporated into Minerals Technologies’ business structure. The transaction also changed the way the AMCOL name should be interpreted: it refers to a former independent corporate group rather than an active standalone listed issuer. There is insufficient source material to reconstruct every stage of AMCOL’s history or to state precisely which product lines continued under which post-acquisition names. The supported historical conclusion is that AMCOL developed as a U.S. specialty-minerals and chemical-products company, served a broad collection of industrial and commercial applications, and ceased independent operation following Minerals Technologies’ 2014 acquisition.

  • 2014

    Merger agreement with Imerys announced

    [1]

    AMCOL announced on February 14, 2014 that it had signed a merger agreement with Imerys. The agreement was later terminated after a competing offer from Minerals Technologies was judged superior.

  • 2014

    Minerals Technologies completes acquisition

    [2]

    Minerals Technologies completed the purchase of all outstanding AMCOL shares on May 9, 2014, ending AMCOL’s existence as an independent publicly traded company.

Products and positioning

A business-to-business supplier of specialty minerals, clays, absorbents, and related chemical materials for industrial and commercial applications

  • Industrial minerals

    Bentonite and performance minerals

    Bentonite and other performance minerals formed a central part of AMCOL’s industrial-materials activities. Their useful characteristics could include swelling, sealing, binding, thickening, and absorption. The materials were supplied for applications such as foundry operations, drilling, agriculture, construction, environmental engineering, and other industrial processes. The available sources do not identify a complete set of product trademarks or individual commercial grades.

  • Functional materials

    Mineral absorbents

    AMCOL supplied mineral-based absorbent materials for industrial, environmental, pet-care, and related applications. These products used mineral porosity, surface chemistry, swelling, clumping, or barrier properties to capture liquids, control moisture, or support application-specific formulations. Public references support the product category but do not provide a definitive catalog of historical brands or formulations.

  • Construction materials

    Construction moisture-barrier clays

    The company offered clays used as moisture barriers in commercial construction. These materials were intended to help control water or moisture movement in building-related systems, illustrating AMCOL’s focus on performance characteristics rather than on consumer-brand recognition. The available source does not specify a product name, launch date, or complete technical specification.

Brand decisions

  • 2014

    AMCOL selects Minerals Technologies’ competing acquisition proposalM&A

    Background

    AMCOL had announced a merger agreement with Imerys, but Minerals Technologies later submitted a rival proposal. AMCOL regarded the competing proposal as superior.

    Action taken

    The Imerys merger agreement was terminated and AMCOL proceeded with the Minerals Technologies transaction.

    Aftermath

    Minerals Technologies completed the acquisition of all outstanding AMCOL shares on May 9, 2014. AMCOL ceased to be an independent New York Stock Exchange-listed company.

Sources2 sources

Cite this profile: Cite the canonical profile. /brand-wiki/amcol-international-corporation · Editorial policy · How profiles are compiled