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and his student W. A. Caspary in 1873, who noticed and described its tendency to change into a clear, hard, transparent substance especially in sunlight. Studies on acrylic esters slowly developed until Staudinger's theory of macromolecules and his research into the nature of polyacrylates allowed control over polymerization. The company Rohm and Haas, founded by German chemist Otto Röhm,

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