Tarnish inhibiting composition and article containing it

Details Tarnish inhibiting composition and article containing it Tarnish inhibiting composition and article containing it

2007-08-28

2007-08-28

Toomer, Cephia D. (Department: 1714)

Compositions

Preservative agents

Anti-corrosion

C252S389520, C252S389620, C524S430000, C524S442000

Reexamination Certificate

active

10676760

ABSTRACT:
An effective tarnish inhibiting (“TI”) polymer composition including a scavenger for hydrogen sulfide optionally in the presence of an acid gas such as sulfur dioxide, provides excellent protection against tarnishing of the lustrous surfaces of a silver object. When the composition is thermoformed into a box-like container or extruded as film which contains uniformly dispersed solid micron-sized particles of the scavenger chosen from zinc oxide and a silicate of an alkali metal in an amount no greater than 5% by weight of the polymer, it is transparent so that the condition of the stored silver may be assessed. A solid inert adjuvant may be added. All solid particles in the material have a primary particle size smaller than 53 μm which makes it possible to obtain the uniform dispersion. A silver object may be wrapped in the film, or stored in a sealed box so that the solid particles in the polymer are not coated on the surfaces of the silver object.

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