Drug patents …
… from Kazakhstan to Kalamazoo
Deep knowledge on
small-molecule drugs and
the 110,000 global patents
Anticipate generic drug launch
Manage your formulary budget
Proactively manage your pharmacy inventory
Find generic entry opportunities
Flat-rate pricing for predictable budgeting
Short-term plans for project- or client-based billing
Upgrade to enjoy subscriber-only features like email alerts and data export. See the Plans and Pricing
|Title:||PROCESS FOR INCREASING WATER REPELLENCY OF COTTON CLOTH|
|Abstract:||A manufactured material and a process for making the material is disclosed. The manufactured material is a hydrogen containing substance having a fluorinated surface and in which hydrogen atoms, which may be present in hydroxyl radicals attached to a carbon atom chain, have been replaced in the surface of the material by fluorine atoms or radicals, and with such fluorinated surface of the material containing at least about 2 micrograms of such fluorine per cm.sup.2 of surface area. The process for making such a material includes the steps of selecting a substrate containing hydrogen atoms which may be present in hydroxyl radicals attached to a carbon atom chain, selecting a gas containing fluorine atoms or radicals, placing the selected substrate between electrodes in a flowing atmosphere of the selected gas at subatmospheric pressure, and subjecting the substrate to an electrodeless discharge of at least about 0.2 KWH/yard.sup.2 to chemically activate both the surface of the substrate and the gas, and exchange the fluorine atoms or radicals for surface hydrogen atoms or radicals to produce a material with a surface, which compared to the substrate before this process treatment, is more water repellent (without sealing pores), is more corrosion and soil resistant, more chemically inert, and more like the relatively expensive polytetrafluoro-ethylene. When the substrate is a material having a relatively inert surface, such as polyethylene, the process is disclosed as including an initial treatment step that involves ion bombardment of the substrate in helium gas to activate the surface before the surface is treated in the fluorine containing gas.|
|Inventor(s):||Manion; Jean P. (Milwaukee, WI), Davies; Daniel J. (Mukwonago, WI)|
|Assignee:||Allis-Chalmers Manufacturing Company (Milwaukee, WI)|
|Filing Date:||Aug 01, 1969|
|Claims:||1. A process for increasing the water repellency of cotton cloth including the steps of: selecting a treatment gas from a group consisting of CF.sub.4, C.sub.2 F.sub.6, C.sub.3 F.sub.8, C.sub.4 F.sub.8(c), CHF.sub.3 and SF.sub.6 ; arranging the cotton cloth between electrodes separated by an insulating material; flowing an atmosphere of the gas between the electrodes and in contact with the cloth at the rate of approximately 5 millimoles per minute under a pressure of between 0.5 and 50 Torr; and applying electric power to the electrodes to expose a unit area of the cotton cloth to an electrodeless discharge of electrical energy of about 0.2 KWH per square yard of cloth. |
2. A process according to claim 1 in which said power is applied to subject the substrate in the flowing atmosphere of gas to said discharge until the hydrogen replaced by fluorine provides in said surface at least about 2 micrograms of such fluorine per cm.sup.2 of surface area.
3. A process according to claim 1 in which said power is applied to subject the substrate in the flowing atmosphere of gas to said discharge for a period of from 3 to 400 seconds.
Drugs may be covered by multiple patents or regulatory protections. All trademarks and applicant names are the property of their respective owners or licensors. Although great care is taken in the proper and correct provision of this service, thinkBiotech LLC does not accept any responsibility for possible consequences of errors or omissions in the provided data. The data presented herein is for information purposes only. There is no warranty that the data contained herein is error free. thinkBiotech performs no independent verifification of facts as provided by public sources nor are attempts made to provide legal or investing advice. Any reliance on data provided herein is done solely at the discretion of the user. Users of this service are advised to seek professional advice and independent confirmation before considering acting on any of the provided information. thinkBiotech LLC reserves the right to amend, extend or withdraw any part or all of the offered service without notice.