Compositions – Nonreactive analytical – testing – or indicating compositions
Reexamination Certificate
1997-10-28
2001-06-05
Redding, David A. (Department: 1744)
Compositions
Nonreactive analytical, testing, or indicating compositions
C356S237600
Reexamination Certificate
active
06241912
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a deformation detecting agent composition that can easily detect sheet metal deformation (hereinafter deformation), especially deformation such as unevenness on the surface of a car body. It relates to a sheet metal deformation brightener composition that can easily detect deformation before surface treatment to permit correction so that efficient operation can be achieved due to a significant decrease in man-hours, and the factors of degradation in the corrosion resistance due to the deformation can be eliminated.
2. Description of the Prior Art
In pressed products such as sheet metal products manufactured by pressing, a deformation such as an unevenness, recess, protrusion, or distortion can be produced on their surfaces by inadvertent mishandlling. Such deformation on the surface of a product may cause serious problems in subsequent processes. For example, deformation in a sheet metal product will be noticeable after the product is coated in a subsequent process, so that a risk that the coated products cannot be used may arise. Therefore, these products must be subjected to an inspection process before the next manufacturing process.
In the inspection process, detecting deformation by scanning the surface of a product with a light beam and treating its reflected light has been proposed. In this case, if the surface of the product is not glossy or it has a remarkably low reflection efficiency, a surface suitable for the treatment cannot be obtained, and therefore the accuracy of the deformation detection may be reduced.
Then, a prior art that can solve the above problems has proposed preventing the diffuse reflection of light by coating the surface of a product with an oily liquid comprising a glossy oil (Publication of Japanese Unexamined Patent Application No. Hei 3-175000). Another prior art has proposed coating with a highly volatile liquid instead of the oily liquid so that the liquid does not remain in treatment in subsequent processes (Publication of Japanese Examined Patent Application No. Sho 48-7986).
In order to form a uniform glossy surface using the oily liquid comprising a glossy oil, it is preferable to use an electrostatic coating method, for example. However, the oily liquid is conductive, so that an insulation treatment is required for an electrostatic coating apparatus. Therefore, this method is very expensive. Highly volatile liquids such as alcohol and trichloroethylene are non-conductive, so that they do not require the insulation treatment. However, they are combustible and harmful, so that considerable care is required to use them.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide an aqueous deformation-detecting brightener composition that can easily detect deformation such as unevenness on the surface of a car body.
In order to solve the above problems, aqueous deformation-detecting brighteners were examined to find that a liquid thin film having low foaming property and excellent glossiness is formed by using a glycol ether compound and a surfactant, leading to the present invention.
The aqueous sheet metal deformation brightener composition of the present invention comprises the following main components (a) and (b):
(a) a compound expressed by the following general formula (I)
R
1
—O—(AO)
m
—R
2
(I)
where “R
1
” represents an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 2 to 9 carbon atoms, an alkylphenyl group having 1 to 9 carbon atoms, or a functional group expressed by the following general formula (II), “A” represents an alkylene group having 2 to 4 carbon atoms, “m” represents an average adduct molar number of alkylene oxide, a number of 1 to 20, in which the same alkylene oxide may be added alone, or a mixture of two or more types of alkylene oxide may be added, and “R
2
” represents an alkyl group having 1 to 9 carbon atoms, an alkenyl group having 1 to 9 carbon atoms, or hydrogen
Ph—(CH
2
)
n
— (II)
where “Ph” represents a phenyl group, and “n” represents an integer of 0 to 3;
(b) a surfactant.
The component (a) used in the present invention, the compound expressed by the general formula (I), is a glycol monoether or glycol diether.
Examples of glycol monoethers having the general formula (I) include ethylene glycol monomethyl ether, diethylene glycol monomethyl ether, triethylene glycol monomethyl ether, ethylene glycol monopropyl ether, diethylene glycol monopropyl ether, triethylene glycol monopropyl ether, ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol monobutyl ether, ethylene glycol monohexyl ether, diethylene glycol monohexyl ether, ethylene glycol mono-2-ethyl hexyl ether, diethylene glycol mono-2-ethyl hexyl ether, ethylene glycol monophenyl ether, diethylene glycol monophenyl ether, triethylene glycol monophenyl ether, ethylene glycol monobenzyl ether, diethylene glycol monobenzyl ether, and triethylene glycol monobenzyl ether.
Examples of glycol diethers include ethylene glycol dimethyl ether, ethylene glycol diethyl ether, and ethylene glycol dibutyl ether.
These compounds may be used individually or as a mixture of two or more types.
Among the glycol ether compounds having the general formula (I), those having 4 or more carbon atoms in total for the end ether residual groups (the carbon atoms of “R
1
+R
2
”) are preferably used. Also, the glycol portion is preferably formed by addition of ethylene oxide or propylene oxide. Its adduct molar number “m” is preferably 1 to 4.
Nonionic surfactants, anionic surfactants, cationic surfactants or amphoteric surfactants can be used as the surfactant of the component (b). However, nonionic surfactants or anionic surfactants are preferably used.
Examples of the nonionic surfactants include the following compounds. Here, “p” represents an average adduct molar number of alkylene oxide. Ethylene oxide, propylene oxide, butylene oxide, or a mixed adduct thereof is used as the alkylene oxide. (1) polyoxyalkylene (p=1 to 40) alkyl or alkenyl (C
10
to C
22
) ether, preferably p=3 to 40;
(2) polyoxyalkylene (p=1 to 40) alkyl or alkenyl (C
10
to C
22
) phenyl ether, preferably p=3 to 40;
(3) polyoxyalkylene (p=0.5 to 40) alkyl or alkenyl (C
10
to C
22
) amine, preferably p=2 to 20;
(4) polyoxyalkylene (p=0.5 to 50) alkyl or alkenyl (C
10
to C
22
) amide, preferably p=3 to 50, more preferably p=2 to 20;
(5) ethylene oxide/propylene oxide block adduct (a Pluronic type surfactant).
Among the above nonionic surfactants, those having the following general formula (III) are most preferable for the present invention
R
3
—O—(AO)
p
—H (III)
where “R
3
” represents an alkyl group, an alkenyl group, a phenyl group, or an alkylphenyl group, each of which has 10 to 22 carbon atoms, “A” represents an alkylene group having 2 to 4 carbon atoms, and “p” , the average adduct molar number of alkylene oxide, represents a number of 1 to 40, preferably 3 to 30, in which the same alkylene oxide may be added alone, or a mixture of two or more types of alkylene oxide may be added.
These surfactants may be used individually or as a suitable combination of two or more types. The preferable combination is the combination of a nonionic surfactant expressed by the general formula (III) and polyoxyalkylene alkyl or alkenyl amine or amide. Their ratio is preferably the nonionic surfactant expressed by the general formula (III) /amine or amide=9/1 to 1/9 (by weight).
Examples of the anionic surfactants include the following compounds:
(1) straight chain alkylbenzenesulfonate having an alkyl group of 8 to 16 carbon atoms on average;
(2) alpha olefin sulfonate having 10 to 20 carbon atoms on average;
(3) dialkyl sulfosuccinic acid having an alkyl group having 4 to 10 carbon atoms or an alkenyl group having 4 to 10 carbon atoms;
(4) fatty acid lower alkyl ester sulfonate expressed by the following general formula (IV) or a sulfonated fatty acid comp
Hata Hiroshi
Kitano Yasuhiko
Kobayashi Naoki
Kodama Akira
Miyaoka Hiroya
Honda Giken Kogyo Kabushiki Kaisha
Merchant & Gould P.C.
Redding David A.
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