By Marta Falconi

ZURICH--A group of Sika AG (SIK.VX) shareholders has asked for a change to the Swiss company's articles of incorporation to make it more difficult for French materials conglomerate Saint-Gobain SA (SGO.FR) to buy the chemical maker.

On Tuesday, the Ethos Foundation and 11 shareholders who hold shares representing 1.7% of Zurich-based Sika's capital, said they have submitted a resolution requesting the company drop an "opting out" clause at an expected extraordinary shareholder meeting.

The clause allows an investor who purchases shares representing more than a third of the company's voting rights to be exempted from the obligation to make an offer for the rest of the shares.

"This is very detrimental to minority shareholders and endangers one of the flagships of Swiss industry," Ethos said in a statement.

The call for the vote comes two weeks after Sika became embroiled in a takeover tussle following an agreement between Saint-Gobain and members of the Burkard family, descendants of the company's founder. Saint-Gobain agreed to pay 2.75 billion Swiss francs ($2.8 billion) in cash for Schenker-Winkler Holding AG, a family company that holds 16% of Sika's capital but represents 52% of its voting rights.

In a statement, Sika said its board "will examine the request and proposal and will comment in due course." Saint-Gobain said the action "has no legal basis."

Sika, with annual sales of more than CHF5.14 billion, supplies a range of additives for concrete and cement. It also makes waterproofing products for the building sector and noise-damping products for automobile makers.

In late afternoon trading, Sika shares were 2.07% higher at CHF2,964.

Write to Marta Falconi at Marta.Falconi@wsj.com

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