| http://www.w3.org/ns/prov#value | - Examples of organic materials susceptible to degradation and embraced by the method of the present invention are cellulose derivates, e.g. cellulose acetate, cellulose acetobutyrate, ethyl cellulose, cellulose nitrate and cellulose propionate, polyalkylenes, notably polyethylene and polypropylene, polyvinyl derivatives, e.g. polyvinyl chloride, polyvinyl chloride acetate and polyvinyl alcohol, pol
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