Compatibilizing agent based on polyolefin with polyamide grafts and mixtures comprising same

Compatibilizer comprising a polyolefin backbone and olyamide grafts wherein:

• the grafts are attached to the backbone via the residues of an unsaturated monomer (A) having a functional group which acts as activator in the polymerization of lactams and which is not an isocyanate functional group,
• the residues of the unsaturated monomer (A) are fixed to the backbone by copolymerization from its double bond,
• wherein (A) is an oxazoline of the following formula
• wherein R1 derives from an alkyl, aromatic or cycloalkyl group and R1 carries a double bond which opens to graft to the backbone.

Compatibilizer comprising a polyolefin backbone and polyamide grafts wherein:

• the grafts are attached to the backbone via the residues of a difunctional monomer (A3) having a first functional group which acts as activator in the polymerization of lactams and a second functional group capable of reacting with a reactive site of the polyolefin backbone,
• the residues of the unsaturated monomer (A3) are fixed to the backbone by reaction of its second functional group with a reactive site of the polyolefin backbone,
• wherein (A3) is a oxazoline of following formula:
• wherein R1 derives from an alkyl, aromatic or cycloalkyl group and R1 carries the second functional group.

Process for the preparation of a compatibilizer comprising a polyolefin backbone and polyamide grafts wherein in the compatibilizer:

• the grafts are attached to the backbone via the residues of a bisoxazoline (A3) having a first functional group which acts as activator in the polymerization of lactams and a second functional group capable of reacting with a reactive site of the polyolefin backbone,
• the residues of the unsaturated monomer (A3) are fixed to the backbone by reaction of its second functional group with a reactive site of the polyolefin backbone,
• wherein the second functional group of the bisoxazoline is carried on a group derived from an alkyl, aromatic or cycloalkyl group;
• wherein in the process:
• (i) the difunctional monomer (A3) is attached to the polyolefin backbone and then (ii) the precursor lactam of the grafts and a catalyst are added and heating is carried out to obtain anionic polymerization of the lactam, which spreads starting from the activating functional group carried by (A3);
• subsequently, the compatibilizer and polyamide which has formed apart from the grafts are optionally separated.