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AssigneeNorthern Technologies International Corporation
InventorsDonald Alfons Kubik, Boris Varshal, Efim Ya Lyublinski, Barbara Ann Nygaard
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An effective corrosion inhibiting polymer composition including an interceptor for an acid gas combined with known VCI ingredients produces a more effective VCI than the prior art composition. The composition in macrogranular form may be held in a receptacle which is sealed in a container in which ferrous articles are protected. When the composition, greatly diluted is injection- or blow-molded or extruded as film which contains more than 100 ppm of a 2,4-6-tri-substituted phenol and uniformly dispersed small amounts of solid micron-sized particles of interceptor, an alkali metal nitrite and a solid adjuvant to aid in dispersing the solid particles, the film is transparent and has a smooth surface. All solid particles in the material have a primary particle size smaller than 53 μm which makes it possible to obtain the uniform dispersion, transparency and smooth surfaces of an article such as film in which a ferrous metal object is wrapped prior to shipment; or, a capsule which is filled with the VCIs and placed with ferrous metal objects in a sealed container.
A concentrate adapted to be diluted with a diluent polymer to produce a corrosion inhibiting composition effective to protect a ferrous metal surface against corrosion in a molecular-oxygen containing atmosphere containing in the range from 1 to 100 ppm of an acid gas at a relative humidity of 90% and 37.4° C. (100° F.) , when the surface is exposed in generally spaced apart relationship with the composition in a sealed environment, the concentrate consisting essentially of a substantially non-hydrolyzable synthetic resinous polymer having dispersed therein from 10 to about 40 parts of an interceptor selected from the group consisting of an alkali metal silicate and zinc oxide, from 10 to 40 parts of sodium nitrite and from 10 to 40 parts of a 2,4,6-tri-substituted phenol having a 4-substituent selected from the group consisting of a substitutable methylene carbon and a substitutable amine, in combination with an adjuvant present in less than 5 parts, provided that the polymer has a water vapor transmission rate (WVTR) at least as high as that of low density polyethylene, and is present in an amount of at least 40 parts in 100 parts of the composition.
An article of arbitrary size and shape made of substrate polymer consisting essentially of a substantially light permeable film of synthetic resin having substantially uniformly dispersed therein a combination of volatile corrosion inhibiting ingredients including an interceptor selected from the group consisting of zinc oxide and a silicate of an alkali metal, each present in an amount from 0.01 to 2% by weight of the film;
A hollow capsule having walls of a first substantially non-hydrolyzable synthetic resinous polymer containing macrogranules of a corrosion inhibiting composition consisting essentially of a second substantially non-hydrolyzable synthetic resinous polymer having dispersed therein from 10 to about 40 parts of an interceptor selected from the group consisting of an alkali metal silicate and zinc oxide, from 10 to 40 parts of sodium nitrite and from 10 to 40 parts of a 2,4,6-tri-substituted phenol having a 4-substituent selected from the group consisting of a substitutable methylene carbon and a substitutable amine, in combination with an adjuvant present in less than 5 parts, wherein each first and second substantially non-hydrolyzable synthetic resinous polymer may be the same or different, and provided that each polymer has a water vapor transmission rate (WVTR) at least as high as that of low density polyethylene, and is present in an amount of at least 40 parts in 100 parts of the composition.
A method of thermoforming a synthetic resinous polymer having dispersed therein a combination of volatile corrosion inhibiting ingredients comprising, forming macrogranules of a first polymer having dispersed therein from 10 to about 40 parts of an interceptor selected from the group consisting of an alkali metal silicate and zinc oxide, from 10 to 40 parts of sodium nitrite and from 10 to 40 parts of a 2,4,6-tri-substituted phenol having a 4-substituent selected from the group consisting of a substitutable methylene carbon and a substitutable amine, in combination with an adjuvant present in an amount less than 5 parts, provided that the first polymer is present in an amount of at least 40 parts in 100 parts of the macrogranules;
A method of protecting a ferrous object from corrosion in a corrosive atmosphere, comprising,
Dependencies are inferred from the claim text.