Biocidal polyurethane compositions and methods of use

A polymeric composition comprising a polyurethane polymer derived from a polyisocyanate compound and a polyactive hydrogen compound, said polyurethane having an effective amount of covalently bound, antimicrobially active ammonium groups pendant to the polyurethane polymer in a terminal position and/or as a side chain along the polyurethane polymer backbone, wherein the antimicrobially active ammonium group is derived from a compound of the formula (I):

• [CH3(CH2)x(C(O)NH(CH2)y)p]qN⊕(R4)m—(CH2)zLHQ⊖ (I)
• wherein:
• m is 1 or 2;
• p is 1;
• and q=1 or 2 provided that m+q=3;
• x is 6 to 20;
• y is 2-8;
• z is 2-10;
• L is O, S, NR5 or NH;
• where R5 is C1-4 alkyl or benzyl;
• each R4 is independently C1-4 alkyl, phenyl or C6-8 aralkyl;
• and
• Q⊖ is halogen, alkyl sulfate, or carboxylate, sulfonate, sulfate, phosphonate or phosphate;
• or
• an alkylaminoacrylate compound of the formula (II):
• wherein:
• R1 is H or CH3;
• R5 is a C2-8 alkylene;
• Q⊖ is a halogen, alkyl sulfate, alkylsulfonate or carboxylate;
• Z⊕is −N⊕(R4)2R3,−N⊕R4(R3)2,
• wherein:
• R3 is C8-20 alkyl, benzyl, or substituted benzyl;
• each R4 is independently C1-4 alkyl, phenyl or C6-8 aralkyl;
• and
• R6 is H or C1-4 alkyl.