the present invention relates to a method for utilizing a wood hydrolysate obtained from a hydrothermal treatment of a wood material method comprises the steps of providing a wood material , treating the wood material by means of an aqueous hydrothermal treatment so that a wood hydrolysate and a wood residue is formed . the wood hydrolysate comprises oligo - and polysaccharides as the main component of dry matter . the method further comprises the steps of ; separating the wood hydrolysate into at least a first and a second fraction and using at least one of the at least first and second fractions for production of an intermediate or end product . such end product may be e . g . a film , coating , package or a gel . the present invention also relates to a polymer product such as a film , a coating or a gel and its applications . the present invention provides for biodegradable and renewable polymer products and a method which utilizes and extracts a very high product value from a process .