CR-free paint compositions and painted metal sheets

Details CR-free paint compositions and painted metal sheets CR-free paint compositions and painted metal sheets

2005-05-10

2005-05-10

Ahmed, Sheeba (Department: 1773)

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Including a second component containing structurally defined...

C428S219000, C428S330000, C428S413000, C428S457000, C428S458000, C428S421000, C428S480000

Reexamination Certificate

active

06890648

ABSTRACT:
A paint composition containing a corrosion inhibitor A prepared from porous silica particles, to which Ca ion is bonded by ion-exchange, and a polyphosphate B preferably at an A/B weight ratio of 60/40 to 5/95 and at an A+B ratio of 5-150 parts by weight based on 100 parts by weight of resinous components. A base metal sheet is preferably one pre-treated with a chemical agent containing at least one fluoroacid. Since the polyphosphate B controls dissolution of Ca ion, an effect of Ca ion on corrosion inhibition is maintained over a long term. The painted metal sheet does not put harmful influences on the environment, since it does not contain chromium compounds.

REFERENCES:
patent: 5623003 (1997-04-01), Tanaka
patent: 5736255 (1998-04-01), Sasaki et al.
patent: 6015628 (2000-01-01), Urata et al.
patent: 6180177 (2001-01-01), Nagashima et al.
patent: 6562474 (2003-05-01), Yoshimi et al.

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