Detergent additives comprising dye transfer inhibitors, and proc

Details Detergent additives comprising dye transfer inhibitors, and proc Detergent additives comprising dye transfer inhibitors, and proc

1996-10-15

1998-12-15

Hertzog, Ardith

Cleaning compositions for solid surfaces, auxiliary compositions

Auxiliary compositions for cleaning, or processes of preparing

510349, 510360, 510438, 510444, 510475, 510499, 510500, 510503, 510531, 510532, 510533, C11D 760, C11D 337, C11D 1100, C11D 1706

Patent

active

058496840

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a free-flowing powder having a high bulk density comprising certain polymers useful as dye transfer inhibitors in the cleaning of, for example, laundry items.
The invention also relates to a process for making the free-flowing powder.
The use of various polymers as dye transfer inhibitors in detergent compositions has been described in the prior art. One method of incorporating the polymers into granular detergent compositions has been to dry mix powdered polymers with other granular components.
However it has been noted that there is a problem of lumping and caking of granular detergents associated with using hygroscopic polymer powders in this way. Furthermore there are difficulties of bulk handling the those powders.
U.S. Pat. No. 5,259,994 has addressed these problems by mixing polyvinyl pyrollidone with zeolite, a hydrating salt (e.g. carbonate) and a binding agent to prepare a free-flowing detergent additive. However, the small, anhydrous additive readily absorbs water upon contact. The resulting gel can have an adverse effect on product dispensing.
U.S. Pat. No. 4,414,130 discloses a "readily disintegrable, insoluble, held together by a water soluble binder." One such binder which is mentioned is Polyclar.RTM., a PVP supplied by GAF. Methods of manufacturing agglomerates include the use of a fine spray of water to promote adhesion. Example 2(B) discloses a solution of polyvinyl pyrollidone and polyvinyl alcohol which is agglomerated with zeolite. This patent is not, however, concerned with the problems of formulating and processing dye transfer inhibiting agents.
Although polyvinyl pyrrolidone is useful as a dye transfer inhibitor, other polymers are being sought which are even more effective. A more effective polymer is one which can be used in smaller quantities than polyvinyl pyrollidone to achieve the same effect, and which is cheaper.
In today's granular detergent market it is particularly important to find an efficient dye transfer inhibition polymer (or a mixture of polymers) which can be easily handled as a high bulk density granule, and which can be added in small amounts to compact products and which does not have an adverse effect on product dispensing.
The present invention provides a high density agglomerate which comprises copolymers of N-vinylpyrrolidone and N-vinylimidazole, typically at levels of 5% to 50% by weight.
The present invention also provides a process in which a premix of specific hygroscopic dye transfer inhibition polymer with zeolite (or other powder) is prepared prior to agglomeration.


SUMMARY OF THE INVENTION

In a first aspect, the present invention provides a free-flowing powder having a bulk density of at least 600 g/l comprising:
(a) from 20% to 95% by weight (on anhydrous basis) of a detergent ingredient selected from the group consisting of aluminosilicate, citrate, silica, carbonate, bicarbonate, silicate, sulphate, phosphate, water-soluble polymer and mixtures thereof; and
(b) from 5% to 50% by weight of a copolymer of N-vinylpyrrolidone and N-vinylimidazole.
Whilst the free-flowing powder may comprise other components it is preferred that the level of surfactant is than 2% by weight of the powder.
Preferably the free-flowing powder comprises (a) from 50% to 75% by weight (on anhydrous basis) of aluminosilicate and (b) a mixture of polyamine N-oxide and copolymer of N-vinylpyrrolidone and N-vinylimidazole, the total polymer level being from 10% to 30% by weight of the powder.
The mixture of polyamine N-oxide and copolymers of N-vinylpyrrolidone and N-vinylimidazole is typically in the weight ratio of from 5:1 to 1:5, and is preferably about 1:1.
In a second aspect the present invention provides a process for making free-flowing particles comprising hygroscopic powders of polymers comprising the steps of:
(a) mixing a powder comprising polyamine N-oxide and/or copolymers of N-vinylpyrrolidone and N-vinylimidazole with additional powders, the additional powders being selected from the group consisting of aluminosilicate, citra

REFERENCES:
patent: 4605509 (1986-08-01), Corkill et al.
patent: 5133924 (1992-07-01), Appel et al.
patent: 5431857 (1995-07-01), Capeci
patent: 5451341 (1995-09-01), White
patent: 5466802 (1995-11-01), Panandiker et al.
patent: 5478502 (1995-12-01), Swift
patent: 5478503 (1995-12-01), Swift
patent: 5622646 (1997-04-01), Scialla et al.

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