Prepn. of built detergent bars - with improved hardness, by addn. of bentonite to alkylbenzene sulphonic acid before neutralisation

摘要

Built detergent bars contg. (by wt.) 7-45% detergent active material (at least 7% based on total bar of H2O-soluble linear (8-16C)alkyl benzene sulphonate (I)) and 5-60% of detergency builder (II) are prepd. as follows: (a) (I) is mixed with bentonite (III); (b) H2O is added with mixing; (c) (I) is neutralised with an alkali; (d) any optional ingredients are added; and (e) mixt. is processed to form bars. Amt. (III) is 5-50% pref. 10-40% by wt. Suitable (II) include conventional H2O-soluble phosphates or carbonates, and organic builders, etc. Additional detergents to be used with (I) include alkane sulphonates, ethoxylated alcohols, etc. (I) are of formula RR1CHC6H4SO3M, where RR1 are H or 1-15C linear alkyl (RR1 together are 7-15C); M is cation, pref. NH4, K, esp. Na. The process affords detergent bars which have improved hardness. In addn., the required hardness is reached soon after the bar has been produced.