Process for the production of a pourable phosphate-free foam-inh

Details Process for the production of a pourable phosphate-free foam-inh Process for the production of a pourable phosphate-free foam-inh

1992-08-17

1994-06-07

Lieberman, Paul

Compositions

Water-softening or purifying or scale-inhibiting agents

252135, 25217414, 25217417, 25217418, 252321, 252358, B01D 1904, C11D 760, C11D 1100

Patent

active

053187180

DESCRIPTION:

BRIEF SUMMARY
This invention relates to a process for the production of a granular foam-inhibiting preparation containing a foam-inhibiting agent, a solid phosphate-free carrier material and a cellulose ether mixture.
DE 23 38 468 A1 (US-A-3,933,672) relates to a detergent containing a silicone foam inhibitor which is protected against interaction with surface-active ingredients of the detergent. For its production, aqueous melts containing the silicone foam inhibitor and a carrier impermeable to surfactants, such as polyglycols or highly ethoxylated alkyl polyglycol ethers, are first spray-dried and the particles obtained are subsequently provided with a coating in a fluidized bed. Salts typically used in detergents, more particularly tripolyphosphate or carboxymethyl cellulose, may be used as the coating material. A multistage production process such as this is relatively complicated. In addition, the phosphate content is problematical. It has also been found that the shell material only releases the foam inhibitor with delay at low washing temperatures and the undissolved particles can become caught up in the washing where they can cause greasy stains.
DE 31 28 631 - A1 describes the production of foam-inhibited detergents containing microencapsulated silicone foam inhibitors. The silicone is dispersed in an aqueous solution of a film-forming polymer and the dispersion is delivered to the spray-drying tower through a separate pipe, i.e. separately from the other detergent ingredients dissolved or dispersed in water. The two streams are combined in the spray nozzle. The film-forming polymer may be selected, for example, from cellulose ethers, starch ethers or synthetic water-soluble polymers and mixtures thereof. The microcapsules are formed spontaneously in the spray nozzle or by preliminary precipitation by addition of electrolyte salts to the silicone dispersion. The described process is confined to the production of spray-dried detergents and cannot be applied to detergents and cleaning preparations produced by other methods, for example by granulation, or even in other fields of application.
EP 97 867 - A2 describes a process for the production of microencapsulated foam-inhibiting oils by mixing of a silicone emulsion with an aqueous solution of carboxymethyl cellulose and precipitation of the microcapsules by addition of electrolytes, more particularly polyvalent salts, or organic solvents. It has been found that the production of the silicone dispersion requires the presence of non-ionic surfactants having an emulsifying effect. However, this addition leads to a distinct reduction in foam-inhibiting activity. In addition, considerable difficulties are involved in homogeneously dispersing the small quantities of silicone microcapules required for adequate foam inhibition in a comparatively large quantity of washing powder. In addition, the continuous mixing process is complicated by electrostatic charging of the particles in the transport and metering units.
DE-A-34 36 194 - A1 describes a process for the production of pourable foam-inhibiting granules by spray-drying of an aqueous foam-inhibiting dispersion containing film-forming polymers. To produce granules consisting of methyl cellulose in a ratio by weight of 80:20 to 40:60, water, mixture (b) is allowed to swell at a temperature of 15.degree. to 60.degree. C. until the viscosity of the solution is at least 75% of the viscosity measured after complete swelling of the cellulose ether solution, after which the foam inhibitor (a) is dispersed in the solution and the homogenized dispersion is spray-dried after addition of the carrier salts and, optionally, water.
Organopolysiloxanes, paraffins and mixtures of organopolysiloxanes and paraffins are used as the foam inhibitor. The foam inhibitor content is between 1 and 10% by weight and preferably between 3 and 7% by weight. The carrier salt preferably consists of a mixture of sodium silicate, sodium tripolyphosphate and sodium sulfate. The preparation described in the Example contains (in addition to other ingr

REFERENCES:
patent: 3933672 (1976-01-01), Bartolotta et al.
patent: 4419260 (1983-12-01), Reuter et al.
patent: 4894177 (1990-01-01), Starch
patent: 5002695 (1991-03-01), Schulz et al.

Affiliated with

Also associated with

Rating

Process for the production of a pourable phosphate-free foam-inh does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for the production of a pourable phosphate-free foam-inh, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of a pourable phosphate-free foam-inh will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-790997