Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1997-05-05
1998-12-15
Padgett, Marianne
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427539, 4272554, B05D 300, H05H 100, C23C 1600
Patent
active
058493689
ABSTRACT:
A process for rendering the surfaces of polymeric plastic or rubber materials, which are intrinsically non-polar or only slightly polar, and hydrophobic, polar or more polar, and hydrophilic, so that amine-containing functional groups, and ultimately, a durable tenaciously adhering, slippery polyurethane or polyurethane-urea hydrogel coating may subsequently be applied to the polymer surface, is disclosed. The process involves dual plasma-treatment of a polymeric plastic or rubber substrate material; the first treatment being with an oxygen-containing plasma gas, to affix hydroxyl, carboxyl and carbonyl groups to the substrate surface, thereby rendering the surface more polar and activated; and the second treatment being with a nitrogen-containing plasma gas, to affix amine and amino groups to the substrate surface to make it more hydrophilic and reactive toward terminal isocyanate groups of a polyurethane or polyurethane/urea prepolymer adduct intermediate tie-coat which is subsequently applied to the substrate surface and then converted to a tenaciously adhering, slippery hydrogel coating. The process is especially suited to the hydrophilicization of intrinsically non-polar and hydrophobic polymeric plastic materials, such as polyethylenes, nylons-11 and nylons-12.
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Ding Ni
Helmus Michael N.
Hostettler Fritz
Akers Lawrence C.
Padgett Marianne
Richardson Peter C.
Schneider ( USA ) Inc
Strassburger Philip C.
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