Patent ID: 9045577
Filing Date: 2015-06-02
Classification: B32B,C08F,C08L

Abstract:
1. A process for the manufacture of grafted polyethylene, comprising the following stages: a) fermenting one or more renewable starting materials optionally including purification, to produce ethanol or mixtures of alcohols comprising ethanol; b) dehydrating said alcohol(s) obtained in order to produce, in a first reactor, ethylene or mixtures of alkenes comprising ethylene optionally including purification of the alkene in order to obtain ethylene; c) polymerizing, in a second reactor, said ethylene to give polyethylene; d) isolating said polyethylene obtained on conclusion of stage c); e) grafting of the polyethylene with at least one grafting monomer chosen from unsaturated carboxylic acids or their functional derivatives, unsaturated dicarboxylic acids having from 4 to 10 carbon atoms and their functional derivatives, C wherein a purification stage is carried out during stage b), wherein the purification stage comprises the removal of ethanol, propane and acetaldehyde and wherein the purification stage results in a degree of purity greater than 99%, wherein the purification stage comprises cooling at least to a temperature of −103.7° C. and distilling.