Polyelectrolyte complexes
    68.
    发明授权

    公开(公告)号:US09796872B2

    公开(公告)日:2017-10-24

    申请号:US15005366

    申请日:2016-01-25

    摘要: The present invention relates to aqueous compositions of associative polyelectrolyte complexes (PECs), optionally containing surfactants, biocidal agents and/or oxidants, which can provide surface protection to treated articles including reduced soiling tendency, reduced cleaning effort and improved soil repellancy, as well as providing bacteriostatic properties to treated surfaces that thereby gain resistance to water, environmental exposure and microbial challenge. Treatment means and compositions are provided that employ associative polyelectrolyte complexes formed by combining a water soluble cationic first polyelectrolyte with a water soluble second polyelectrolyte bearing groups of opposite charge to the first polyelectrolyte under suitable mixing conditions where the one polyelectrolyte present in molar excess is added in the form of a first aqueous solution during a mixing step to a second aqueous solution comprising the oppositely charged polyelectrolyte present in molar deficiency. Also provided are means to form stable associative polyelectrolyte complexes in aqueous solutions having R values from about 0.10 to 20, including near stoichiometric R values approaching 1, being the ratio of charged groups present on the component polyelectrolytes employed.

    METHOD FOR CLEANING SYSTEMS
    70.
    发明申请

    公开(公告)号:US20170191006A1

    公开(公告)日:2017-07-06

    申请号:US15128549

    申请日:2015-03-24

    申请人: THONHAUSER GMBH

    摘要: A method is provided for cleaning a system by conducting continuously through the system a cleaning composition including at least one oxidizing agent and an indicator for detecting the cleanliness of the system by observation of a color change of the indicator. Color values are determined at one or more points and compared with a setpoint value. Color values F are determined at fixed time intervals after exit of the composition from the system; differences ΔF are formed from two color successive values; color values are determined before commissioning of the clean system until the difference ΔF=0, after which the color value measured last is defined as an inherent system value FA and a maximum tolerable deviation from this value is fixed as a setpoint value ΔFA for cleaning; and cleaning of the system is carried out after operation of the system until a difference of ≦ΔFA is measured.