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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKiyoshi Imada, Susumu Ueno, Hirokazu Nomura
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The invention provides a novel and efficient method for modifying the surface properties of a shaped article of a synthetic resin such as a polyvinyl chloride resin in which a remarkable anti-static effect is obtained on the surface so that accumulation of static electricity on the surface is greatly reduced. The inventive method comprises exposing the surface of the shaped article to a low temperature plasma generated in a gaseous atmosphere containing a nitrogen-containing organic compound such as an amine, acid amide, diamine and heterocyclic organic compound having at least one nitrogen atom in a molecule as the ring member at a pressure from 0.001 to 10 Torr. The gas or vapor of the above mentioned nitrogen-containing organic compound is preferably diluted with an inorganic gas. The effectiveness of the above described plasma treatment is further enhanced when the plasma-treated surface of the shaped article is subsequently brought into contact with a halogen, a hydrogen halide or an organic halogen compound, e.g. chlorine, hydrogen chloride, hydrogen bromide and allyl chloride, preferably, in a gaseous phase at a pressure of at least 10 Torr.
A method for modifying the surface properties of a shaped article of a synthetic resin which comprises exposing the surface of the shaped article to a low temperature plasma generated in a gaseous atmosphere containing a nitrogen-containing organic compound selected from the group consisting of organic amine compounds represented by the general formula R.sup.1 -NR.sup.2.sub.2, in which R.sup.1 is a monovalent hydrocarbon group and R.sup.2 is a hydrogen atom or a monovalent hydrocarbon group, organic acid amide compounds represented by the general formula R.sup.3 -CO-NR.sup.4.sub.2, in which R.sup.3 is a monovalent hydrocarbon group and R.sup.4 is a hydrogen atom or a monovalent hydrocarbon group, organic diamine compounds represented by the general formula R.sup.5.sub.2 N-R.sup.6 -NR.sup.7.sub.2, in which R.sup.5 and R.sup.7 are each a hydrogen atom or a monovalent hydrocarbon group and R.sup.6 is a divalent hydrocarbon group and heterocyclic organic compounds having at least one nitrogen atom in a molecule as the ring member, at a pressure in the range from 0.001 to 10 Torr, and then contacting the compound with a halogen or a halogen-containing compound.
Dependencies are inferred from the claim text.