Microparticle composition and use thereof

A personal care or home care product comprising a personal care or home care base composition and a particulate component comprising a self-assembled microparticle comprising an acid having two or more acid groups and an organic base and the molar ratio of acid groups to basic groups may be 0.6 to 1.4:1. The microparticles may be 0.5-10 microns in size. Also claimed is a personal care or home care product comprising a macroporous material formed from the self-assembled microparticles described herein. The microparticles may be obtained by contacting the acid and base in a hydrophilic solvent wherein the acid is insoluble or sparing soluble in the solvent and the base is soluble in the solvent. The microparticles may comprise a bis acid, e.g. bis-carboxylic acid in which terminal carboxylic acids are linked by a hydrophobic region such as brassylic acid, sebacic acid or azelaic acid. The base may be a nitrogen containing base such as N-methylmorpholine, N,N-dimethylaminoethanol, 4-dimethylaminopyridine, imidazole, 1-methylimidazole, poly(diallyldimethylammonium chloride), didecyldimethylammonium chloride, dodecyldipropylenetriamine or poly epsilon lysine. The microparticles may be cross-linked to give a macroporous material.