Two stage process for the production of molded articles

Details Two stage process for the production of molded articles Two stage process for the production of molded articles

C - Chemistry, Metallurgy

08

G

402/171, 402/182

C08G 18/00 (2006.01) C08G 18/04 (2006.01) C08G 18/08 (2006.01) C08G 18/18 (2006.01) C08G 18/63 (2006.01)

Patent

CA 1328946

TWO STAGE PROCESS FOR THE PRODUCTION OF MOLDED ARTICLES ABSTRACT OF THE DISCLOSURE Molded articles are produced in a two-stage process. In the first stage, an organic polyisocyanate is reacted with an organic compound containing at least two epoxide groups (NCO: epoxide equivalent ratio of 1.2:1 to 500:1) in the presence of a tertiary amine catalyst. This reaction is stopped when no more than 65% of the isocyanate groups have reacted by adding an alkylating sulfonic acid alkyl ester of methyl iodide and/or of dimethyl sulfate in an amount equivalent to the amount of tertiary amine catalyst present. A latent catalyst capable of being activated by heat is subsequently added to the intermediate product and the resultant mixture is heated in a mold to complete the crosslinking of the intermediate product and to form the molded article.

553826

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