An anti-corrosive polyurethane coating composition which has excellent anti-corrosive property, water resistance, adhesive property to metals and impact resistance and can be coated thick in one coating operation, comprising (1) a polyol mixture of castor oil or a polyol derived from castor oil and an amine polyol produced by addition reaction of an alkylene oxide to a nitrogen-containing compound having at least 2 active hydrogen atoms such as ammonia, an aliphatic amine or an aromatic amine, the amine polyol having at least 2 hydroxyl groups and a hydroxyl value of at least 150 mgKOH/g, (2) a polyisocyanate compound, and optionally coal tar, an aromatic hydrocarbon oil or resin, or usual paint additives.

BACKGROUND OF THE INVENTION 
The present invention relates to an anti-corrosive paint, and more 
particularly to an anti-corrosive polyurethane coating composition which 
can be applied relatively thick for providing water resisting, corrosion 
resisting, impact resisting or electrically insulating films. 
Hitherto, coal-tar enamels, asphalt and epoxy coal tar paints have been 
used as anti-corrosive coating compositions. However, they are poor in low 
temperature characteristics such as curability, brittleness, impact 
resistance and flexibility. Further, epoxy coal tar paints have a good 
adhesion property, but have the defects that the coating efficiency and 
abrasion resistance are bad because the curing time is long and it is hard 
to coat thick. 
Melt coating of polyethylene has also been made for the above purposes. 
However, it requires a large-scale equipment and is unfit for coating in a 
small amount. Also, it is difficult to adopt the melt coating onto weld 
zones and irregular shape portions of steel pipes at the scene of labor. 
A main object of the present invention is to eliminate the above-mentioned 
defects of conventional anti-corrosive coating compositions. 
A further object of the present invention is to provide an anti-corrosive 
coating composition which has excellent corrosion resistance, water 
resistance and adhesion property to metals and can be applied thick for 
the purpose of corrosion inhibition, water proofing, formation of impact 
resistant film or electric insulation. 
These and other objects of the present invention will become apparent from 
the description hereinafter. 
SUMMARY OF THE INVENTION 
In accordance with the present invention, there is provided an 
anti-corrosive coating composition comprising a non-foamed polyurethane 
resin produced by reaction of (1) a polyol component comprising a polyol 
mixture of (a) a castor oil polyol and (b) an amine polyol produced by 
addition reaction of an alkylene oxide of the general formula: 
##STR1## 
wherein R.sup.1 and R.sup.2 are hydrogen atom, an alkyl group or an aryl 
group, provided that at least one of R.sup.1 and R.sup.2 is hydrogen atom, 
to a nitrogen-containing compound having at least 2 active hydrogen atoms, 
said amine polyol having at least 2 hydroxyl groups and a hydroxyl value 
of at least 150 mgKOH/g, and (2) a polyisocyanate component comprising a 
polyisocyanate compound. 
DETAILED DESCRIPTION 
The anti-corrosive polyurethane coating composition of the present 
invention is usually prepared into a two-package paint consisting of a 
polyol composition, namely the polyol component (1), and a polyisocyanate 
composition, namely the polyisocyanate component (2). 
In the present invention, a mixture of a castor oil polyol (a) and an amine 
polyol (b) is used as a polyol. The castor oil polyol (a) used in the 
present invention includes, for instance, castor oil, mono- or 
di-glyceride of castor oil fatty acid and a mixture thereof, polyhydroxyl 
polyesters such as interesterification products of castor oil and an 
ethylene oxide, propylene oxide, butylene oxide or styrene oxide adduct of 
dipropylene glycol, glycerol or trimethylolpropane, an esterification 
product of ricinoleic acid and an ethylene oxide, propylene oxide, 
butylene oxide or styrene oxide adduct of dipropylene glycol, glycerol, 
ricinoleic polyol or trimethylolpropane, and the like. 
The amine polyol (b) used in the present invention is a polyol prepared by 
addition reaction of an alkylene oxide having the above-mentioned general 
formula to a nitrogen-containing compound having at least 2 active 
hydrogen atoms. It is essential that the amine polyol has at least 2 
hydroxyl groups and a hydroxyl value of not less than 150 mgKOH/g. When 
the hydroxyl value is less than 150 mgKOH/g, the corrosion inhibiting 
property is lowered. 
Examples of the alkylene oxide used in the present invention are, for 
instance, ethylene oxide, propylene oxide, butylene oxide and styrene 
oxide. 
Examples of the nitrogen-containing compound are, for instance, ammonia; an 
aliphatic amine such as methylamine, ethylenediamine or 
diethylenetriamine; an alicyclic amine such as cyclohexylamine; 
piperazine; isophoronediamine; an aromatic amine in which an amino group 
is directly linked to the aromatic ring such as aniline, toluidine, 
di(methylamino)benzene, aminobenzoic acid, aminophenol, methylaminophenyl, 
phenylenediamine or bis(aminophenyl)methane; an aromatic amine in which an 
amino group is indirectly linked to the aromatic ring such as benzylamine: 
an adduct of an aliphatic amine and styrene oxide or phenyl glycidyl 
ether; and the like. 
The castor oil polyol and the amine polyol can be used in arbitrary ratios. 
Preferably, they are used so that the weight average hydroxyl value is at 
least 180 mgKOH/g. Usually, the amine polyol is used in an amount of 5 to 
70% by equivalent, especially 10 to 50% by equivalent, based on the whole 
polyol. When the amount of the amine polyol is more than the above range, 
the hydrophilic property of the obtained polyurethane is increased and the 
corrosion inhibiting property tends to become worse. 
The polyisocyanate compound used in the present invention includes, for 
instance, aromatic polyisocyanates, aliphatic polyisocyanates, alicyclic 
polyisocyanates, and mixtures thereof. Among them, aromatic 
polyisocyanates such as tolylene diisocyanate (TDI) and diphenylmethane 
diisocyanate (MDI) are particularly preferable. The polyisocyanate 
compound is used in an amount such that the ratio of isocyanato group 
(NCO) to the active hydrogen atom of the polyol is from 0.85 to 1.15:1 by 
equivalent, preferably 0.90 to 1.10:1 by equivalent. 
The coating composition of the present invention may contain coal tar, an 
aromatic hydrocarbon oil or an aromatic hydrocarbon resin. Various known 
coal tars can be used in the present invention, e.g. raw tar, road tar, 
refined tar and anhydrous tar. The coal tar is employed in an amount of 5 
to 150% by weight, preferably 10 to 100% by weight, based on the 
polyurethane resin. When the amount of the coar tar is more than the above 
range, the corrosion inhibiting property is decreased. 
Examples of the aromatic hydrocarbon oil used in the present invention are, 
for instance, an alkyl-substituted aromatic polycyclic compound such as an 
alkyldiphenyl or an alkylnaphthalene, an aromatic process oil, and the 
like. Examples of the aromatic hydrocarbon resin used in the present 
invention are, for instance, coumarone-indene resin, a C.sub.9 petroleum 
resin, an aromatic hydrocarbon resin obtained from an extract rich in 
aromaticity with furfural, phenol or a like solvent from a petroleum heavy 
residue or a petroleum distillate having an average molecular weight of 
150 to 850, and an aromatic hydrocarbon resin (commercially available 
under the commercial name "Fukkol Resin" made by Fujikosan Kabushiki 
Kaisha) obtained from an extract with furfural, phenol or a like solvent 
or a cracking distillate obtained at the time of an oxidation treatment of 
a petroleum with oxygen or air. The aromatic hydrocarbon oil or resin is 
employed in an amount of 5 to 100% by weight, preferably 10 to 50% by 
weight, based on the polyurethane resin. When the amount of the aromatic 
hydrocarbon oil or resin is more than the above range, the corrosion 
inhibiting property is decreased. 
The anti-corrosive polyurethane coating composition of the present 
invention has excellent corrosion resistance, water resistance and 
adhesion property to metals and a low moisture and oxygen permeability. 
These excellent effects are produced by the use of the amine polyol having 
a hydroxyl value of at least 150 mgKOH/g in combination with the caster 
oil polyol. In particular, it is considered that the amine polyol has a 
good compatibility with the castor oil polyol and the use thereof improves 
the adhesion property of the produced polyurethane resin and decreases the 
moisture permeability and oxygen permeability of the films. 
The anti-corrosive coating composition of the present invention may contain 
usual paint additives, as occasion demands, such as an inorganic filler, 
an antifoaming agent, a catalyst, a plasticizer and a solvent. Examples of 
the inorganic filler are, for instance, calcium carbonate, surface-treated 
calcium carbonate, talc, silica sand, mica, glass flake, iron oxide, 
carbon, and the like. Examples of the antifoaming agent are, for instance, 
synthetic zeolite, quick lime, soluble anhydrous gypsum, and the like. Any 
catalysts such as tin catalysts and lead catalysts generally used for 
formation of polyurethane are employed as a catalyst. Examples of the 
plasticizer are, for instance, phthalic acid esters, benzoic acid esters, 
adipic acid esters, process oil, liquid petroleum resin, chlorinated 
paraffin, and the like. Examples of the solvent are, for instance, 
methylene chloride, toluene, xylene, ethyl acetate, and the like. When it 
is desired to obtain a coating composition which can be applied thick, it 
is preferable to use a solvent in as small amounts as possible. 
By suitably incorporating additives into the composition of the invention, 
it is possible to apply the composition with a film thickness of 2 to 3 
mm. (dry) by one application procedure and moreover with decreased 
foaming. 
The anti-corrosive coating composition of the invention is applicable for 
corrosion inhibition to metals such as steel, aluminum, tin and cast iron, 
for instance, in the form of pipe, tube, rod, plate or can. In case of 
applying the coating composition to metal plates, it is desirable to 
conduct surface treatment such as degreasing, derusting or rubbing. 
The preparation of the coating composition of the present invention is not 
limited to a particular process. For instance, there can be adopted a 
one-shot process in which a polyisocyanate composition (A) and a polyol 
composition (B) into which additives, coal tar or an aromatic hydrocarbon 
oil or resin are incorporated, as occasion demands, are admixed in a 
predetermined ratio, or a prepolymer process in which a part of a polyol 
is added to a polyisocyanate compound to form a prepolymer composition (A) 
containing an isocyanate prepolymer, and the composition (A) is admixed 
with a polyol composition (B) containing the remaining polyol with, if 
necessary, additives, coal tar or an aromatic hydrocarbon oil or resin, in 
a predetermined ratio. 
The anti-corrosive coating composition of the present invention is useful 
as anti-corrosive paints for crude oil reserve tank, petroleum tank, steel 
structures of various plants, sea structures, steel pipe and cast iron 
pipe, and surface paints of iron board. 
The present invention is more specifically described and explained by means 
of the following Examples, in which all % and parts are by weight unless 
otherwise noted. It is to be understood that the present invention is not 
limited to the Examples, and various changes and modifications may be made 
in the invention without departing from the spirit and scope thereof.

EXAMPLE 1 
To 100 parts of castor oil fatty acid monoglyceride (hydroxyl value: 127 
mgKOH/g) was added 172 parts of liquid diphenylmethane diisocyanate 
(hereinafter referred to as "MDI"). After causing to react at 90.degree. 
C. for 1.5 hours in a nitrogen stream, 10 parts of xylene was added to the 
reaction mixture. The viscosity of the obtained prepolymer composition was 
5,000 cP at 25.degree. C., and the amount of the free NCO groups was 15%. 
To 152 parts of the prepolymer composition were added 50 parts of castor 
oil (hydroxyl value: 160 mgKOH/g), 50 parts of an adduct of aniline and 3 
moles of propylene oxide (hydroxyl value: 420 mgKOH/g), 74 parts of mica 
powder and 5 parts of synthetic zeolite, and they were uniformly admixed. 
The NCO/OH equivalent ratio of the thus obtained anti-corrosive 
polyurethane coating composition was 1.05. 
The coating composition was applied to a shot blasted steel pipe treated 
with a primer, and after aging at room temperature for 7 days, it was 
subjected to a test. 
The results are shown in Table 1. 
The water absorption was measured according to Japanese Industrial Standard 
(JIS) K 6911, and the impact resistance and flexibility were measured 
according to JIS K 5664. 
TABLE 1 
______________________________________ 
Shore D hardness 55 
Water absorption (%) 
1.6 
Volume resistivity (.OMEGA. .multidot. m.sup.2) 
Initial 5.8 .times. 10.sup.14 
After dipping in 1.2 .times. 10.sup.14 
water for 30 days 
Impact resistance No cracking and 
no peeling off 
Flexibility Endurable to round rod 
of 5 mm in diameter 
______________________________________ 
EXAMPLES 2 AND 3 AND COMATIVE EXAMPLES 1 TO 4 
To 100 parts of the polyol mixture shown in Table 2 were added 30 parts of 
coal tar, 30 parts of carbon, 30 parts of mica, 2.5 parts of synthetic 
zeolite and 0.2 part of dibutyl tin dilaurate, and they were uniformly 
admixed to give a polyol composition (B). 
Crude MDI was used as a polyisocyanate composition (A), and it was admixed 
with the composition (B) to form an anti-corrosive coating composition. 
The coating composition was coated to form a film having a thickness of 
about 2.0 mm. After aging the film at room temperature for 7 days, the 
hardness of the film was measured (initial hardness). Also, with respect 
to the film dipped in a 10% aqueous solution of NaOH at 80.degree. C. for 
14 days, the hardness was measured. 
The coating composition was applied in a thickness of about 1.5 mm to a 
shot blasted steel plate, and after aging at room temperature for 7 days, 
the physical properties of the film were measured by a testing method for 
tar epoxy resin paints provided in JIS K 5664. 
The results are shown in Table 2. 
In Table 2, the water absorption was measured according to JIS K 6911. 
Also, the adhesion property was estimated by cross-cutting a film, dipping 
in a 3% aqueous solution of sodium chloride at 50.degree. C. for 1 month 
and observing peeling off of the film. 
TABLE 2 
__________________________________________________________________________ 
Com. 
Com. 
Com. 
Com. 
Ex. 2 
Ex. 3 
Ex. 1 
Ex. 2 
Ex. 3 
Ex. 4 
__________________________________________________________________________ 
Amine polyol 
Benzylamine-butylene oxide 
-- 20.0 
-- -- -- -- 
adduct (OH value 220 mgKOH/g) 
Aniline-propylene oxide adduct 
40.0 
-- -- -- -- 43.6 
(OH value 480 mgKOH/g) 
Castor oil polyol 
Castor oil (OH value 160 mgKOH/g) 
60.0 
-- 100 -- -- -- 
Castor oil fatty acid diglyceride 
-- 80.0 
-- 80.0 
60.0 
-- 
(OH value 190 mgKOH/g) 
Other polyols 
Dipropylene glycol 
-- -- -- 20.0 
-- -- 
(OH value 280 mgKOH/g) 
Glycerol-propylene oxide 
-- -- -- -- 40.0 
56.4 
adduct (OH value 140 mgKOH/g) 
Amount of MDI (A) (part) 
73.8 
50.3 
41.0 
53.0 
43.6 
70.0 
(A)/(B) weight ratio 
2.61/1 
3.83/1 
4.70/1 
3.64/1 
4.42/1 
2.75/1 
Shore D hardness 
Initial 70 65 31 30 37 63 
After dipping 67 63 22 15 19 33 
Water absorption (%) 
+1.4 
+1.5 
+4.9 
+7.1 
+6.7 
+10.3 
Flexibility O O O O O O 
Impact resistance O O O O O O 
Alkali resistance O O O O O O 
Acid resistance O O O O O O 
Appearance after 3 cycles 
O O O O O O 
of cooling and heating 
(-20.degree. C. and 80.degree. C.) 
Moisture resistance 
O O O O O O 
Salt spray test O O X X X O 
Gasoline resistance 
O O O O O O 
Adhesion good 
good 
peeling 
peeling 
peeling 
peeling 
__________________________________________________________________________ 
(Note) 
O: pass 
X: failure 
It is observed in Table 2 that the films formed from the anti-corrosive 
coating composition of the present invention show little change in 
hardness even if dipped in a 10% aqueous NaOH solution at 80.degree. C. 
for 14 days, and have a very low water absorption and excellent adhesion 
property. It would be understood that the coating composition of the 
invention has an excellent anti-corrosive property. It is also observed in 
Table 2 that the films of Comparative Examples show a large change in 
hardness and a very large water absorption, and peeling off of the films 
occurs in the adhesion test, thus it would be understood that the 
anti-corrosive property is bad. 
EXAMPLE 4 
To 100 parts of castor oil fatty acid monoglyceride (hydroxyl value: 127 
mgKOH/g) was added 172 parts of liquid MDI. The reaction was conducted at 
90.degree. C. for 1.5 hours in a nitrogen stream, and 10 parts of xylene 
was added to the reaction mixture to form a prepolymer composition. The 
viscosity of the prepolymer composition was 5,000 cP at 25.degree. C., and 
15% of the NCO groups of MDI remained as free NCO groups. 
To the prepolymer composition were added 60 parts of castor oil (hydroxyl 
value: 160 mgKOH/g), 40 parts of an adduct of ethylenediamine and 4 moles 
of propylene oxide (hydroxyl value: 757 mgKOH/g), 74 parts of mica powder 
and 5 parts of synthetic zeolite, and they were uniformly admixed. The 
NCO/OH equivalent ratio of the thus obtained anti-corrosive polyurethane 
coating composition was 1.05. 
The coating composition was applied to a shot blasted steel pipe treated 
with a primer, and after aging at room temperature for 7 days, the 
physical properties of the film was measured in the same manner as in 
Example 1. 
The results are shown in Table 3. 
TABLE 3 
______________________________________ 
Shore D hardness 60 
Water absorption (%) 
1.2 
Volume resistivity (.OMEGA. .multidot. m.sup.2) 
Initial 2 .times. 10.sup.13 
After dipping in 1 .times. 10.sup.13 
water for 30 days 
Impact resistance No cracking and 
no peeling off 
Flexibility Endurable to round rod 
of 5 mm in diameter 
______________________________________ 
EXAMPLES 5 AND 6 AND COMATIVE EXAMPLE 5 
The procedures of Examples 2 and 3 were repeated except that the polyol 
mixtures shown in Table 4 was employed. 
The results are shown in Table 4. 
TABLE 4 
______________________________________ 
Com. 
Ex. 5 Ex. 6 Ex. 5 
______________________________________ 
Amine polyol 
Ethylenediamine-butylene 
-- 20.0 -- 
oxide adduct 
(hydroxyl value 280 mgKOH/g) 
Ammonia-propylene oxide adduct 
40.0 -- 43.6 
(hydroxyl value 477 mgKOH/g) 
Castor oil polyol 
Castor oil 60.0 -- -- 
(hydroxyl value 160 mgKOH/g) 
Castor oil fatty acid diglyceride 
-- 80.0 -- 
(hydroxyl value 190 mgKOH/g) 
Other polyols 
Glycerol-propylene oxide adduct 
-- -- 56.4 
(hydroxyl value 140 mgKOH/g) 
Amount of MDI (A) (part) 
70.0 53.0 70.0 
(A)/(B) weight ratio 
2.75/1 3.64/1 2.75/1 
Shore D hardness 
Initial 68 65 61 
After dipping in 10% NaOH soln. 
67 62 32 
at 80.degree. C. for 14 days 
Water absorption (%) 
+1.2 +1.5 +10.3 
Flexibility O O O 
Impact resistance O O O 
Alkali resistance O O O 
Acid resistance O O O 
Appearance after 3 cycles of cooling 
O O O 
and heating (-20.degree. C. and 80.degree. C.) 
Moisture resistance O O O 
Salt spray test O O O 
Gasoline resistance O O O 
Adhesion good good peeling 
______________________________________ 
(Note) 
O: pass 
X: failure 
It is observed in Table 4 that the films formed from the coating 
composition of the present invention show little change in hardness even 
if dipped in an aqueous alkali solution at an elevated temperature, and 
also, the water absorption is very low and the adhesion to metals is very 
good. 
EXAMPLE 7 
To 100 parts of castor oil fatty acid monoglyceride (hydroxyl value: 127 
mgKOH/g) was added 172 parts of liquid MDI. The reaction was conducted at 
90.degree. C. for 1.5 hours in a nitrogen stream, and 10 parts of an 
aromatic process oil was added to the reaction mixture to form a 
prepolymer composition. The viscosity of the prepolymer composition was 
7,000 cP at 25.degree. C., and 15% of the NCO groups of MDI remained as 
free NCO groups. 
To 152 parts of the prepolymer composition were added 50 parts of castor 
oil (hydroxyl value: 160 mgKOH/g), 50 parts of an adduct of aniline and 3 
moles of propylene oxide (hydroxyl value: 420 mgKOH/g), 74 parts of mica 
powder and 5 parts of synthetic zeolite, and they were uniformly admixed. 
The NCO/OH equivalent ratio of the thus obtained anti-corrosive 
polyurethane coating composition was 1.05. The weighted average hydroxyl 
value of the polyols was 231.6 mgKOH/g. 
The coating composition was applied to a shot blasted steel pipe treated 
with a primer, and after aging at room temperature for 7 days, the 
physical properties of the film was measured in the same manner as in 
Example 1. 
The results are shown in Table 5. 
TABLE 5 
______________________________________ 
Shore D hardness 50 
Water absorption (%) 
1.6 
Volume resistivity (.OMEGA. .multidot. m.sup.2) 
Initial 5.1 .times. 10.sup.14 
After dipping in 1.0 .times. 10.sup.14 
water for 30 days 
Impact resistance No cracking and 
no peeling off 
Flexibility Endurable to round rod 
of 5 mm in diameter 
______________________________________ 
EXAMPLES 8 TO 10 AND COMATIVE EXAMPLE 6 
The procedures of Examples 2 and 3 were repeated except that the polyol 
mixture shown in Table 6 was employed as a polyol and an aromatic 
hydrocarbon resin (commercial name "Fukkol Resin FRL" made by Fujikosan 
Kabushiki Kaisha) was employed instead of coal tar. In Comparative Example 
6, the use of the aromatic hydrocarbon resin was omitted. 
The results are shown in Table 6. 
TABLE 6 
__________________________________________________________________________ 
Com. 
Ex. 8 
Ex. 9 
Ex. 10 
Ex. 6 
__________________________________________________________________________ 
Amine polyol 
Ethylenediamine-butylene oxide adduct 
-- -- 20.0 -- 
(OH value 280 mgKOH/g) 
Ammonia-propylene oxide adduct 
40.0 -- -- -- 
(OH value 477 mgKOH/g) 
Aniline-propylene oxide adduct 
-- 30.0 -- -- 
(OH value 420 mgKOH/g) 
Castor oil polyol 
Castor oil (OH value 160 mgKOH/g) 
60.0 70.0 -- 60.0 
Castor oil fatty acid diglyceride 
-- -- 80.0 -- 
(OH value 190 mgKOH/g) 
Other polyols 
Glycerol-propylene oxide adduct 
-- -- -- 40.0 
(OH value 140 mgKOH/g) 
Amount of MDI (A) (part) 
70.0 61.0 53.0 39.0 
(A)/(B) weight ratio 
2.75/1 
3.16/1 
3.64/1 
4.94/1 
Shore D hardness 
Initial 68 70 65 29 
After dipping in 10% NaOH soln. 
67 70 62 14 
at 80.degree. C. for 14 days 
Water absorption (%) 
+1.2 +0.9 +1.5 +10.7 
Flexibility O O O O 
Impact resistance O O O O 
Alkali resistance O O O O 
Acid resistance O O O O 
Appearance after 3 cycles of cooling 
O O O O 
and heating (-20.degree. C. and 80.degree. C.) 
Moisture resistance 
O O O O 
Salt spray test O O O X 
Gasoline resistance 
O O O O 
Adhesion good good good peeling 
__________________________________________________________________________ 
(Note) 
O: pass 
X: failure 
EXAMPLES 11 TO 13 AND COMATIVE EXAMPLES 7 TO 9 
Each of the anti-corrosive polyurethane coating compositions prepared in 
Examples 1, 4 and 7 was applied in thickness of 1.5 mm to a steel pipe 
(inner diameter: 1 m), and was aged at room temperature for 7 days. 
For comparison, the following test specimens were also prepared. An asphalt 
primer was applied to the same steel pipe as above, and thereon molten 
asphalt was then applied in thickness of 5 mm (Comparative Example 7). A 
coal tar primer was applied to the same pipe as above, and molten coal tar 
was then applied in thickness of 5 mm (Comparative Example 8). A coal tar 
primer was applied to the same pipe as above, and a commercially available 
tar epoxy resin paint was then applied in thickness of 1,500 .mu.m (wet) 
and dried (Comparative Example 9). 
By employing the thus prepared specimens, the impact resistance were 
measured according to JIS G 3492. The results are shown in Table 7. 
TABLE 7 
______________________________________ 
Impact resistance 
Anticorrosive paint 
at -5.degree. C. 
at -30.degree. C. 
______________________________________ 
Example 1 0.7 0.9 
Example 4 0.5 0.7 
Example 7 0.5 0.9 
Com. Ex. 7 18 &gt;65 
Com. Ex. 8 35 &gt;65 
Com. Ex. 9 3.1 4.5 
______________________________________ 
It is observed in Table 7 that the anti-corrosive coating compositions of 
the present invention have an excellent impact resistance. 
In addition to the ingredients used in the Examples, other ingredients can 
be used in the Examples as set forth in the specification to obtain 
substantially the same results.