Cleaning compositions for solid surfaces – auxiliary compositions – Cleaning compositions or processes of preparing – For cleaning a specific substrate or removing a specific...
Reexamination Certificate
2000-03-23
2001-09-04
Gupta, Yogendra N. (Department: 1751)
Cleaning compositions for solid surfaces, auxiliary compositions
Cleaning compositions or processes of preparing
For cleaning a specific substrate or removing a specific...
C510S383000, C510S419000, C424S616000
Reexamination Certificate
active
06284719
ABSTRACT:
DESCRIPTION
A two pack system for the preparation of peracid compositions for teat-dips. The present invention relates to the disinfection of cow's teats before and after milking to reduce bacteria and protect the skin. It relates in particular to improvements and additions to a prior Patent Application (Number 9720287.3; Filing Date Sep. 25, 1997)
Dairy farmers mill cows two or in some cases three times per day. Although pre-milking disinfectants are now becoming more readily available the general practice is to spray or dip the teat after milking to reduce bacteria, reduce the risk of disease and problems with individual cows to ensure the best quality of milk.
The teat-dip products available are largely based on chlorhexidine or iodine as the active disinfecting ingredient and generally contain emollients (moisturizers) to preserve the quality of the skin and prevent cracking or irritation Peracetic acid has been used in the past with dilution from basic equilibrated formulations but can cause problems due to initancy through too high concentrations, acidic pH and/or the absence of moisturizers to preserve skin quality.
Peracetic acid can be formulated with emolients as is the case with a concentrated product, Upersan, available from Kesla Chemie GMBH in Germany, which requires a dilution of 1 part in 9 parts water prior to use and is claimed to be stable for 24 hours at ambient or 48 hours at 8° C. The product on dilution has an active peracetic acid level of approximately 1100 ppm which is effective against bacteria, particularly mastitis and is non-irritant.
The Kesla product has a number of limitations which the present invention overcomes. The first is that it is diluted with water of unknown quality which restricts its in-use life due to degradation and decomposition of the final diluted product. Although it has an acidic pH it is lower than the pH of cow's skin and increases the risk (if the dilution is not accurate) of irritancy due to pH. It has an unpleasant odor even after dilution and contains no color which is of use to the farmer to indicate which teats have been treated. It also has no noticeable thickness or viscosity.
According to the present invention all these limitations are overcome by using two separate packs made up of an equilibrated solution of peracetic acid and a second solution used to dilute the peracetic acid at the time of use.
The second (diluent) solution is consistant in make-up and of known quality improving the claimed use life of the product. Patent Application (Number 9720287.3) refers to the inclusion of sodium hydroxide as an alkali buffer but it may be substituted with alternative alkali buffers such as bi-carbonates or other metal hydroxides. Furthermore the correct choice of peracetic acid may allow a lower quantity of alkali buffer to be included or omitted altogether whilst the two pack system allows recognized thickeners such as vegetable gums to be incorporated to further enhance the physical properties of the final in-use product.
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Chemical Abstracts, vol. 104, p. 192 (1986).
Chemical Abstracts, vol. 104, p. 339 (1986).
Gupta Yogendra N.
Marshall O'Toole Gerstein Murray & Borun
Petruncio John M
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