... Polymethyleneketene Dimers and Trimers JLE ERICKSON, FRANK E. COLLINS, JR.,~ AND BEXNY L. OWE+' Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana Received August Si, 1965 ... (22) W. H. Perkin, J . Chem. ... 84, 196 (1042); Chem. ...