Process for obtaining thermoplastic composite pellets reinforced with cellulose pulp and additive cellulose pulp

Process for obtaining thermoplastic composite pellets reinforced with cellulose pulp comprising the steps of:

• a) cellulose pulp milling carried out in a knife mill consisting of a tube in which the cellulose pulp is milled by an axle with knives comprised within said tube;
• b) preparing a masterbatch consisting of the mixture of the milled cellulose pulp of step a) and a thermoplastic polymer in a mixing chamber at a temperature ranging from about 90° C. to about 300° C. by:
• b.1) adding and melting the thermoplastic polymer in the mixing chamber;
• and
• b.2) after complete melting of the thermoplastic polymer, adding the milled cellulose pulp of step a) into the mixing chamber;
• wherein the masterbatch comprises a thermoplastic polymer and the milled cellulose pulp of step a) at a ratio of 10/90 to 90/10;
• c) milling the masterbatch of step b) into the knife mill;
• d) drying the milled masterbatch produced in step c) for 1 to 48 hours at 30° C. to 100° C.;
• and
• e) obtaining the thermoplastic composite pellets reinforced with cellulose pulp by means of the extrusion of the dried masterbatch of step e) and an additional thermoplastic polymer through a twin screw extruder using two gravimetric feeders, one for each product, with speeds ranging from 10 to 400 rpm and temperatures from about 90° C. to about 300° C.