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Patent Abstracts

      260.     ------.  BRUBAKER, M. M.  (E. I. du Pont de Nemours & Co.).  Interpolymers of Carbon Monoxide.  United States Patent 2,495,286, Jan. 24, 1950.  Chem. Abs., vol. 44, 1950, p. 4285.

Copolymers of CO with unsaturated organic compounds are prepared using peroxide catalysts and re useful as protective coatings, fibers, plasticizers, and adhesives.  Thus, 125 parts H2O and 0.5 part Bz2O2 under 325 atm. CO and enough C2H2 to give 500 atm. pressure give after 11 hr. at 115º a polymer, m. 200º-202º, containing keto groups and having 1.2:1-C2H2:CO ratio.  It is soluble in Me2NCHO, insoluble in toluene, MeOH, Me2CO, and AcOH.  A lower melting polymer forms if solvent is absent (73º-77º reaction temperature at 1,000 atm.).  Et2O2 catalyst gives a polymer infusible to 250º, whose molecular ratio is 1.3: 1: use of 30:70 CO-C2H2 mixture in this case at 129º for 14 hr. gives an orientable polymer, m. above 250º.  Mixtures of Olefins and dienes may be used, as well as unsaturated esters, such as vinyl acetate, diallyl phthalate, di-Etmaleate, C2F4, and vinyl chloride.  Various organic peroxides are the preferred catalysts.