Patent ID: 6914088

Claim:
A granular or powdery diacetal composition comprising: (A) at least one diacetal represented by the formula (1) wherein R 1 and R 2 are the same or different and each represent a hydrogen atom, a C 1 to C 4 alkyl group, a C 1 to C 4 alkoxy group, a C 1 to C 4 alkoxycarbonyl group or a halogen atom; a and b are each an integer of 1 to 5; c is 0 or 1; when a is 2, the two R 1 groups taken together with the benzene ring to which they are linked may form a tetralin ring; and when b is 2, the two R 2 groups taken together with the benzene ring to which they are linked may form a tetralin ring; (B) at least one anionic surfactant, selected from the group consisting of: a saturated or unsaturated aliphatic alcohol sulfuric ester salt represented by the formula (a): R a —OSO 3 M (a) wherein R a is a C 6 to C 30 saturated or unsaturated aliphatic group, and M is Li, Na, K or NH 4 ; a polyoxyethylene alkyl or alkenyl ether sulfuric ester salt represented by the formula (b): R b O—(CH 2 CH 2 O) m —SO 3 M (b) wherein R b is an alkyl group (C 8 to C 22 ), or alkenyl group (C 8 to C 22 ), m is an integer of 1 to 8, and M is Li, Na, K or NH 4 ; a polyoxyethylene alkylphenyl ether sulfuric ester salt represented by the formula (c): wherein R c is an alkyl group (C 8 to C 22 ), n is an integer of 1 to 8, and M is Li, Na, K or NH 4 ; a sulfuric ester salt of a polyhydric alcohol fatty acid partial ester formed from a C 3 to C 6 polyhydric alcohol and a C 8 to C 22 saturated or unsaturated fatty acid, and C 8 to C 22 saturated or unsaturated fatty acid monoalkanol (C 2 to C 6 ) amide sulfuric ester salt, wherein the salt is selected from the group consisting of a lithium salt, sodium salt, potassium salt and ammonium salt; and (C) at least one aliphatic monocarboxylic acid optionally having at least one hydroxyl group in the molecule, components (B) and (C) being uniformly dispersed in the particles of the granular or powdery diacetal composition, and component (B) being present in an amount of 0.1 to 3 wt % and component (C) being present in an amount of 0.3 to 5 wt %, and the total amount of component (B) and component (C) being not more than 7 wt %, based on the diacetal composition.