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The Polyurethane Industry in Japan and its Future

were mainly used as industrial materials. Later on, the manufacturing technique of polyether polyurethane foam was introduced into Japan; restrictions placed on the raw material imports were alleviated because of favorable foreign currency exchange rates. Additionally, polyurethane foam was gaining a good reputation as a cushioning material. A dispute arose between Bayer and Du Pont over their patents of polyurethane foam production in 1960. While the dispute was pending, 13 foam manufacturers were established one after another by 1962. In 1963 the two corporations, Bayer and Du Pont, agreed to a cross license under which each of the 13 foam manufacturers became a licensee of either of the two corporations on the same terms and conditions, and under which no newcomer would be admitted to become a licensee until the expiration of the cross license in 1971.