Biocide impregnated fiber-reinforced sponge material

Details Biocide impregnated fiber-reinforced sponge material Biocide impregnated fiber-reinforced sponge material

1999-03-31

2001-05-22

Higel, Floyd D. (Department: 1626)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Biocides; animal or insect repellents or attractants

C424S404000, C424S405000, C424S409000, C424S410000, C424S413000, C424S443000, C424S457000, C523S122000

Reexamination Certificate

active

06235302

ABSTRACT:

The present invention relates to a fiber-reinforced sponge cloth which is produced by the viscose process and which makes a versatile cleaning and decontaminating cloth, especially for the private household.
Sponge cloth production by the viscose process is well known. First, pulp, especially wood pulp, is converted with sodium hydroxide and carbon disulfide into an alkaline cellulose xanthate solution, so-called viscose solution. At the same time, cotton noils are degreased with dilute, detergent-containing NaOH and mercerized. Viscose solution and cotton fibers are then mixed together to form a homogeneous mass, generally with the aid of a kneader. Glauber's salt (sodium sulfate decahydrate) is then added and likewise mixed in uniformly. This sponge cloth raw material is then applied to a foraminous endless belt to whichever depth is desired. The regeneration of the cellulose then takes place in a heated, alkaline coagulation bath. It can also be carried out in an acidic medium, for example dilute sulfuric acid. In the process, the internal reinforcement becomes integrated into the sponge cloth body.
Glauber's salt has a very low melting point (about 32 to 33° C). It therefore melts in the coagulation bath and is dissolved out. The disappearing salt crystals leave pores and voids behind. Finally, the sponge cloth is washed out to rid it of salt residues and adhering reaction products. After drying, it is cut into narrow lengths, which in turn are rolled up. The roll material can then be end-itemed into cloths of the desired size. If desired, it can additionally be printed beforehand.
However, fibre-reinforced sponge cloths are brittle in the dry state. They are therefore marketed in this form only in a few countries. Moistened sponge cloths, in contrast, are more flexible and have a significantly better “hand”. To keep the sponge cloth moist, the sponge cloth lengths are impregnated with the solution of a hygroscopic salt, especially magnesium chloride. Excess liquid is removed with the aid of a pair of squeeze rolls. The moist cloths are then packaged, normally in a polymeric film However, inside the package, micro-organisms, especially bacteria and fungi, can multiply, which shows itself in the form of dark spots on the sponge cloths.


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