Hot melt adhesive comprising functionalized polyolefins

A hot melt adhesive comprising a polar group-containing olefin copolymer having:

• a number average molecular weight (Mn) between 10 to 50 kg/mol, measured according to the ISO 16014-4 and ASTM D6474 methods at 150° C. on a Polymer Char GPC-IR built around an Agilent GC oven model 7890,
• a crystallinity (Xc) content below 30%, measured according to ISO 11357-1:2016 using a Differential Scanning Calorimeter Q100 from TA Instruments,.
• an enthalpy (ΔH) between 5 to 65 J/g, measured according to ISO 11357-1:2016 using a Differential Scanning Calorimeter Q100 from TA Instruments,
• a polydispersity index (PDI) from 2 to 6, measured according to the method ISO 16014-4 and ASTM D6474 methods at 150° C. on a Polymer Char GPC-IR® built around an Agilent GC oven model 7890,
• a melting temperature (Tm) between 40 and 120° C., measured according to ISO 11357-1:2016 using a Differential Scanning Calorimeter Q100 from TA Instruments and comprising at least 80 mol % of a constituent unit represented by the following formula (1), optionally a constituent unit represented by the following formula (2), and between 0.1 to 1 mol %, of a constituent unit represented by the following formula (3):
• wherein:
• R1 is H or CH3,
• R2 is a hydrocarbyl group having 0 to 10 carbon atoms,
• R3 is either
• (1) a hydrocarbyl group having 2 to 10 carbon atoms, when X is a hydroxyl functionality, or
• (2) a hydrocarbyl group having 0 to 10 carbon atoms, when X is a polar organic group containing at least one carboxylic acid functionality and 0 to 6 carbon atoms.