The relevance of the problem is due to the need to expand the versatility of water-soluble cellulose ethers and the field of their applications.In terms of their importance and properties, water-soluble cellulose ethers are now an independent specific group of cellulose derivatives. It should be assumed that these cellulose derivatives will receive further distribution not only in their traditional applications, but certainly in other new areas, in particular, in medicine - one of the most interesting and perhaps noblest areas of their application.The book focuses on new cellulose ethers synthesized recently, along with the known water-soluble ethers, methods of their preparation, properties, applications, and physiologically active polymers derived from them.