Application of enzyme microcapsules in liquid detergent
Publication Date: 2014-Nov-05
The IP.com Prior Art Database
Page 01 of 2
Application of enzyme microcapsules in liquid detergents
There have been many attempts on making microcapsules with enzymes to improve the long term performance of liquid detergent, both improving the enzyme stability (by protecting the enzyme against hostile components in the detergent) and in some cases the stability of enzyme labile components (by protecting them against enzyme attack). One example of such enzyme microcapsules is given in IPCOM000239359 (published electronically on IP.COM on 02 November 2014), with enzyme microcapsules prepared by interfacial polymerization having polyamines as one of the wall formation materials.
We have tested the effect of enzyme microcapsules in a number of different liquid detergents, and have found several characteristics that influence the performance.
Inclusion of reducing agents: Many liquid detergents contain small amounts of reducing agents (e.g., bisulfite or metabisulfite) to remove traces of oxidants that can interact with various components in the detergents, e.g., perfume. However, addition of such reducing agents, e.g., sulfites, bisulfites or thiosulfates, has been seen to decrease the stability of encapsulated enzymes, lipases in particular. It is thus important to be careful when using and selecting reducing agents to get the best performance. No or very low content is preferred.
Strong builders: Addition of strong builders to liquid detergents in many cases reduces the enzyme stability (probably due to the builder binding Calcium needed for some enzymes). We have observed that enzyme microcapsules in such detergents are particular advantageous as the enzyme stability is greatly improved compared to non- encapsulated enzyme.
Anionic surfactants: One component which in many cases severely influences enzyme stability in a negative way is anionic surfactants. In some cases the amount of anionic surfactant, or the ratio between anionic and nonionic surfactants, is limited if good enzyme stability is wanted. Using enzyme microcapsules greatly loosen these limits and give the detergent formulator the possibility to add more anionic surfactant (or increase the anionic to nonionic ratio) and thus reduce the need of making compromises between ingoing actives.
Polyvalent anions: It has been found that some polyvalent anions (e.g., polyacrylates) can negatively influence enzyme microcapsules, especially they can influence the release of enzyme from the capsules during wash. It is thus beneficial to avoid or reduce the amount of such polyvalent anions in the liquid detergent when using enzyme microcapsules.
Unit dose detergents (with liquid): The liquid used inside detergent pouches (or unit doses) typically contain very little water to avoid the water soluble film to dissolve or getting sticky. The low water content gives in some cases good enzyme stability, but for some enzymes, especially lipases, the low water content result in poor enzyme stability. This stability can be greatly i...