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CLAIMS
Claim 1. Precoated metal sheet for automobile use
comprising a metal sheet and a coat (a) on at least one
surface of said metal sheet, wherein said coat (a)
5 comprises an organic resin (A), non-oxide ceramic
particles (B) selected from at least one type of borides,
carbides, nitrides, and silicides and which have an
electrical resistivity at 25OC of 0.1x10-~ to 185x10-~ Qcm,
and an anti-corrosive pigment (C).
10 Claim 2. The precoated metal sheet for automobile use
according to claim 1 wherein said organic resin (A)
comprises an organic resin (Al) having at least one type
of hydrophilic functional group.
Claim 3. The precoated metal sheet for automobile use
15 according to claim 1 wherein said organic resin (A)
comprises an organic resin (Al) having at least one type
of hydrophilic functional group and a derivative (A2) of
said resin (Al) .
Claim 4. The precoated metal sheet for automobile use
2 0 according to claim 2 or 3 wherein said organic resin (Al)
has at least one type of functional group which is
selected from a carboxyl group (-COOH), a carboxylate
group (-COO-Mf, where M+ is a monovalent cation), sulfonic
acid group (-S03H), sulfonate group (-so~-M+w,h ere M+ is a
25 monovalent cation), primary amino group (-NH2), secondary
amino group (-NHR', where R1 is a hydrocarbon group),
tertiary amino group (-NR'R', where R1 and R2 are
hydrocarbon groups), quaternary ammonium salt group
(-Nt R1 R 2R 3X- , where R', R', and R3 are hydrocarbon groups,
30 and X- is a monovalent anion), sulfonium salt group.
(-S+ R1 R2 X- , where R' and R2 are hydrocarbon groups, and Xis
a monovalent anion), phosphonium salt group
(-P+ R1 R2 R3 X- , where R', R2, and R3 are hydrocarbon groups,
and X- is a monovalent anion) .
35 Claim 5. The precoated metal sheet for automobile use
according to claim 3 wherein the derivative (A2) of said
resin (Al) is a resin (A2si) of the following general
formula (I) :
General Forrnula (I)
(where, "Al" indicates the organic resin (Al), "Z-"
5 indicates a hydrocarbon chain having CI to Cg, No to Nz,
and 00 to 02, and "Al-Z" indicates "Al" and "2" which are
covalently bonded through functional groups of the two.
Further, "-0-" is an ether bond, "-OHw is a hydroxyl
group, "-X" is a C1 to C3 hydrolyzable alkoxy group,
10 hydrolyzable halogeno group, or hydrolyzable acetoxy
group, "-R" is a CI to C3 alkyl group, and a, b, c, and d
which show the numbers of substituents are all integers
of 0 to 3, where a+b+c+d=3).
Claim 6. The precoated metal sheet for automobile use
15 according to any one of claims 1 to 5 wherein said nonoxide
ceramic particles (B) have an electrical
resistivity at 25OC of 0.1x10-~ to 100x10-~ Qcm.
Claim 7. The precoated metal sheet for automobile use
according to any one of claims 1 to 6 wherein among said
20 non-oxide ceramic particles (B), the particles (Bl) with
a particle diameter of 1 pm to 24 pm,are arranged on at
least one surface of said metal sheet at a rate of 0.8/&
to 40000/mm2.
Claim 8. The precoated metal sheet for automobile use
25 according to any one of claims 1 to 7 wherein said nonoxide
ceramic particles (B) are a mixture of one or more
particles selected from the group consisting of boride
ceramics: BaB6, CeB6, Co2B, COB, FeB, GdB4, GdB6, LaB4,
LaBs, MozB, MOB, MoB2, MozB5, Nb3B2, NbB, Nb3B4, NbBz, NdB4,
30 NdBs, PrB4, PrB6, SrB6, TaB, TaB2, TiB, TiB2, VB, VB2, W2B5,
YB4, YB6, YBl2, and ZrB2, carbide ceramics: MoC, Mo2C, Nb2C,
NbC, TazC, TaC, Tic, V2C, VC, WC, W2C, and ZrC, nitride
ceramics: MozN, Nb2N, NbN, ScN, TazN, TiN, and ZrN, and
silicide ceramics: CoSi2, Mo3Si, Mo5Si3, MoSi2, NbSi2,
NizSi, TazSi, TaSi2, TiSi, TiSiz, V5Si3, VSi2, W3Sir WSb,
ZrSi, and ZrSi2.
5 Claim 9. The precoated metal sheet for automobile use
according to any one of claims 1 to 8 wherein said anticorrosive
pigment (C) comprises one or more types
selected from silicate compounds, phosphate compounds,
vanadate compounds, and metal oxide microparticles (D).
10 Claim 10. The precoated metal sheet for automobile use
according to claim 9 wherein said metal oxide
microparticles (D) comprise one or more types of metal
elements selected from the group consisting of Si, Ti,
Al, and Zr.
15 Claim 11. The precoated metal sheet for automobile use
according to any one of claims 1 to 10 wherein among said
metal oxide microparticles (D), the ratio (Dl/B) of the
total volume of the metal oxide nanoparticles (Dl) with a
particle diameter of 1 nm to 100 nm in said coat (a) to
20 the total volume of said non-oxide ceramic particles (B)
is 20 or less.
Claim 12. The precoated.metd1 sheet for automobile use:.
according to any one of claims 1 to 11 wherein the
content of said non-oxide ceramic particles (B) in the
2 5 coat (a) at 25OC is 0.5 to 65 ~01%.
Claim 13. The precoated metal sheet for automobile.use
according to any one of claims 1 to 12 wherein said coat
(a) has a thickness of 2 to 30 pm.
Claim 14. The precoated metal sheet for automobile use
30 according to any one of claims 1 to 13 wherein said coat
(a) is formed by coating a water-based coating
composition.
Dated this 03.07.2014
WNJNA MEHTA-DUTT]
OF REMR&Y S AGAR
ATTORNEY FOR THE APPLICANT[S]