Anti-dandruff compositions and hair care formulations containing zinc pyrithione and quaternary ammonium salt

A transparent, stable biocidal composition, said composition comprising:

• (i) 0.5-35% w/w of zinc pyrithione,
• (ii) 0.05-20% w/w of a C8-C18 quaternary ammonium salt, preferably cetylpyridinium chloride,
• (iii) 0.5-20% w/w organic amines and/or alkanol amine,
• (iv) 0.5-60% w/w water soluble glycol/polyol/glycol ether/lactam or mixtures thereof,
• (v) 0-10% w/w of a dispersant and/or a rheology modifier and/or a suspending agent, and
• (vi) 0-60% w/w of water.

An opaque, stable biocidal composition, said composition comprising:

• (i) 0.01-20% w/w zinc pyrithione,
• (ii) 0.01-20% w/w C8-C18 quaternary ammonium salt, preferably cetylpyridinium chloride,
• (iii) 0.5-60% w/w water soluble glycol/polyol/glycol ether/lactam or mixtures thereof,
• (iv) 0-10% w/w of a dispersant and/or a rheology modifier and/or a suspending agent, and
• (v) 0-60% w/w of water.