Patent ID: 7758851

Claim:
A cosmetic or dermatological composition containing a preservative system comprising (a) 0.001 to 2% by weight of a cationic surfactant, derived from the condensation of fatty acids and esterified dibasic amino acids, having the formula: and (b) at least one other ionic or non-ionic preservative agent chosen from 0.002 to 0.8% by weight of parabens, from 0.005 to 0.6% by weight of imidazolidinyl urea, from 0.01 to 1% by weight of 2-phenoxyethanol, from 0.003 to 0.6% by weight of 1,3-dimethylol-5,5-dimethylhydantoin, from 0.00015% to 0.0015% by weight of 2-methyl 5-chloro 3,4-isothiazolinone/2-methyl 3,4-isothiazolinone, from 0.001 to 0.2% by weight of quaternium-15, or mixtures of two or more thereof, wherein (a) and (b) are present in a combined amount synergistically effective to control the growth of microorganisms.