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AssigneeThe Procter & Gamble Company
InventorsSaswati Datta, Paul Amaat Raymond Gerard France, Arseniy Valerevich Radomyselskiy
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The present invention relates to a process, preferably a continuous process, of coating a substrate, which allows water vapor and preferably air permeation, with a hydrophobic coating. The process preferably uses a thin film vacuum condensation step to create a monomer coating which is cured in situ after the coating. The process has the benefit of allowing continuous operation and providing an alternative to existing processes for hydrophobic coating. The substrates are coated such that the water vapour permeation sites are not blocked by the coating to maintain the desired breathability. The static water contact angle on the surface of such substrates is more than 95°. Such substrates are preferably employed in absorbent articles such as diapers, incontinence products, underarm sweat pads, sanitary napkins, catamenials, pantiliners, breast pads, shoe inserts of bandages or alternatively in protective garments such as gloves or rain coats for which water vapor transmission in particular from the inside to the outside is highly desirable.
A process of providing hydrophobicity of a degree such that a static water contact angle of more than 95° is achieved on the surface of a water vapour permeable substrate by coating said substrate with a fluro-monomer while maintaining the water vapor permeability of said substrate said process being carried out in a vacuum chamber containing:
Dependencies are inferred from the claim text.