Patent ID: 7722893

Claim:
A method for the antimicrobial treatment of a surface of a plastic, which method comprises contacting said surface of a plastic with a surface coating composition containing an antimicrobially effective amount of a 2,4-bis(alkylamino)pyrimidine of formula wherein R 1 is methyl, R 2 is hydrogen, R 3 is hydrogen, R 4 is butyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl and R 5 and R 6 together form a pyrrolidine, piperidine or morpholine ring; or R 1 is methyl, R 2 is hydrogen, R 3 and R 4 together form a pyrrolidine, piperidine or morpholine ring, R 5 is hydrogen and R 6 is butyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl; or R 1 is methyl, R 2 is straight chain C 3 -C 8 alkyl, R 3 and R 5 are hydrogen, R 4 is butyl, amyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl or dodecyl and R 6 is di-C 1 -C 6 alkylamino-C 1 -C 6 alkyl, mono-C 1 -C 6 alkylamino-C 1 -C 6 alkyl, or —(CH 2 ) 2 —(O—(CH 2 ) 2 ) 1-2 —NH 2 .