Polymeric amphoteric surfactant compound

A polymeric amphoteric surfactant compound having chemical formula I:

• wherein:
• R1 represents a C8 to C22 alkyl group, a —((CH2)2O)o—R5 group, a —((CH(CH3)CH2)pO)—R6 group, a —((CH2)2O)q—((CH(CH3)CH2)rO)—R7 group, or a —((CH(CH3)CH2)q′O)—((CH2)2O)r′—R8 group;
• o and p each independently represent a number from 2 to 8;
• q, q′, r and r′ each independently represent a number from 1 to 5;
• L1 to L3 each independently represent a C1 to C3 alkyl group;
• R2 and R3 each independently represent a C1 to C3 alkyl group;
• R4 represents OH or a C1 to C3 alkyl group;
• R5 to R8 each independently represent a C8 to C22 alkyl group;
• n represents a number from 1 to 5 and m represents a number from 0 to 4, where the sum of n+m is from 1 to 5, provided that n is at least 1.