ExxonMobil Chemical Completes Butyl Rubber Capacity Expansion at
Kawasaki Plant

KAWASAKI, Japan, Oct 21, 2010 (BUSINESS WIRE) --

ExxonMobil Chemical's affiliate ExxonMobil Yugen Kaisha (EMYK) announced that Japan Butyl Co. Ltd. has completed a major expansion to increase butyl rubber production capacity at its plant in Kawasaki, Japan. The expansion adds 18,000 tons per year of production capacity bringing the plant's total capacity to 98,000 tons per year.

The expansion is part of the company's commitment to help meet growing demand for butyl rubber and showcases ExxonMobil's recent advances in process technology. For example, these new proprietary technology advancements allow for the butyl polymerization reaction, which normally occurs at -95°C, to operate at -75°C. This creates significant energy and capital investment savings.

"These advancements are part of ExxonMobil Chemical's longstanding commitment to serve the growing butyl market," said John Lyon, vice president, Global Butyl Polymers Business Unit, ExxonMobil Chemical Company.

"Our goal is to continue being a reliable supplier of quality butyl polymers. This is particularly important for the Asia Pacific market, which is growing at a rapid rate."

ExxonMobil Chemical is an industry leader in the development and application of premium butyl polymers that add value through enhanced product performance in areas such as energy efficiency, longer product life and greenhouse gas emission reduction.

Continuing to address the growth needs of the butyl rubber industry, the Japan Butyl Co. Ltd. expansion is the latest of several recent company expansions to serve the growing butyl market. In 2008, ExxonMobil expanded halobutyl capacity at its Baytown, Texas plant by 60 percent. This was preceded by the 2006 expansion of Japan Butyl Co., Ltd.'s halobutyl capacity at its Kashima plant by 17,000 tons per year.

About Japan Butyl Co., Ltd.

Japan Butyl Co., Ltd., a butyl rubber manufacturing company, is a joint venture of ExxonMobil Yugen Kaisha and JSR Kabushiki Kaisha. The company serves as a supply base for butyl rubber primarily in Asia. ExxonMobil Yugen Kaisha holds a 50 percent stake in Japan Butyl Co., Ltd.

About ExxonMobil Yugen Kaisha and the ExxonMobil Japan Group

The ExxonMobil Japan Group comprises ExxonMobil Yugen Kaisha and its related companies and subsidiaries including TonenGeneral Sekiyu K.K., and is a major manufacturer and marketer in Japan of petroleum fuels, lubricants and petrochemicals. Elements of the Group began operations in Japan in 1893. ExxonMobil Yugen Kaisha is a 100 percent indirect subsidiary of Exxon Mobil Corporation of the United States. TonenGeneral Sekiyu K.K. is listed on the 1st Section of the Tokyo Stock Exchange. For more information, see our websites at www.exxonmobil.jp; www.tonengeneral.co.jp.

About ExxonMobil Chemical

ExxonMobil Chemical is one of the world's premier petrochemical companies with manufacturing, technology and marketing operations around the world. The company delivers a broad portfolio of products and solutions efficiently and responsibly, with a commitment to create outstanding customer and shareholder value. ExxonMobil Chemical endorses the principles of sustainable development, including the need to balance economic growth, social development and environmental considerations. To learn more, visit www.exxonmobilchemical.com.

About ExxonMobil Butyl Polymers

ExxonMobil Chemical Butyl Polymers business is the world's leader in butyl technology, services and products, with more than 65 years of butyl rubber experience. To find out more about ExxonMobil Chemical Butyl Polymers, visit www.butylrubber.com.

Note to Editors:

1. The term "ExxonMobil Chemical Company" refers collectively to some or all of the companies affiliated with Exxon Mobil Corporation (NYSE:XOM), and/or itself, which have chemical manufacturing and/or marketing operations around the world.

2. EMYK holds a 50 percent stake in Japan Butyl Co. Ltd.

SOURCE: Exxon Mobil Corporation

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