Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2000-02-29
2001-09-04
Michl, Paul R. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C427S407100
Reexamination Certificate
active
06284826
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to improvements in a strippable paint for temporarily protecting a paint coating film of an automotive vehicle and a surface of a variety of articles for the purpose of preventing degradation of an external appearance of the vehicle and the articles, and techniques for coating and releasing the strippable paint, and more particularly to the strippable paint which is excellent in external appearance and durability and readily releasable upon applying a release agent having a specified composition, a surface regulating agent for smoothing the coating film surface of the strippable paint so as to provide gloss to the coating film surface, and the release agent for making the coating film of the strippable paint water-soluble thereby facilitating release and removal of the strippable paint.
A temporary protective paint has been occasionally coated on a painted automotive vehicle body to be transferred between production steps and between factories, or on a complete automotive vehicle body to be transported from a dealer to a user, thereby preventing damage of a paint coating film of the automotive vehicle body. This is because there is the possibility of the paint coating film sustains damage so as to degrade the painted external appearance of the automotive vehicle body according to a circumstance where the automotive vehicle body resides. Such a temporary protective paint has been hitherto prepared as of a solvent-soluble resin type, a wax type, an aqueous type or a dispersion type, for the purpose of being applied onto the painted automotive vehicle body.
SUMMARY OF THE INVENTION
However, such a temporary protective paint is required to have a relatively good painted external appearance and a durability to at least rain, snow and dew condensation and to conditions occurred during cruising of the vehicle. On the other hand, the temporary protective paint is required to be finally readily released from the coating film surface of a real or permanent paint on which the temporary protective paint is coated. Thus, such contradictory characteristics are required to the temporary protective paint. Therefore, it has been very difficult to develop temporary protective paints having the contradictory characteristics.
For example, a temporary protective paint having an excellent releasable ability is high in durability under a standstill condition of the vehicle; however, such a temporary protective paint tends to be readily stripped during cruising of the vehicle. In contrast, a temporary protective paint having a high durability tends to be difficult to be stripped after the vehicle has been allowed to stand for a long time. Additionally, a development has been made to obtain a temporary protective paint formed of acrylic nonaqueous dispersion type resinous liquid and compulsorily releasable under the action of an alkaline solution. However, such a developed temporary protective paint is inferior in coating film performance and painted external appearance and in dynamic durability under conditions including vehicle cruising. Besides, alkaline compound is used in an operation for removing the temporary protective paint, and therefore a special waste water treating facility is required.
Therefore, it is an object of the present invention to provide an improved strippable paint, and new techniques for improving a coating film condition of the paint and a releasable ability of the paint, which can effectively overcome drawbacks encountered in conventional strippable paint and techniques for improving coating film conditions of the paints and releasable abilities of the paints.
Another object of the present invention is to provide an improved strippable paint which is excellent in painted external appearance, coated film performance and durability and is readily releasable and removable under the action of a release agent.
A further object of the present invention is to provide an improved surface regulating agent for a specified strippable paint, which can provide gloss to the coating film of the strippable paint upon smoothing the coating film surface in case that so-called “fog (shaded gloss)” is appeared at the coating film of the strippable paint owing to paint mist.
A still further object of the present invention is provide an improved release agent for a specified strippable paint, which can readily release the strippable paint from the surface of a painted article upon making the stoppable paint water-soluble, without requiring a special waste water treating facility.
An aspect of the present invention resides in a strippable paint comprising a nonaqueous dispersion type resinous liquid including a solvent containing aromatic hydrocarbon in an amount ranging from 30 to 45% by weight relative to the solvent, and acrylic copolymer resin particle dispersed in the solvent in an amount ranging from 20 to 30% by weight relative to the nonaqueous dispersion type resinous liquid. The copolymer resin particle is formed of acrylic copolymer having a chain structure including at least one of acrylic acid monomer and methacrylic acid monomer having ethylenic unsaturated bond and carboxyl group. The acrylic copolymer resin particle has an acid value of not lower than 90 and a glass transition temperature ranging from 25 to 40° C. Additionally, diethylene glycol monoether is contained in the nonaqueous dispersion type resinous liquid in an amount ranging from 7 to 13% by weight of a resinous solid content of the nonaqueous dispersion type resinous liquid. Further, polyether-chemically modified polysiloxane compound is contained in the nonaqueous dispersion type resinous liquid in an amount ranging from 0.5 to 2% by weight of the resin solid content of the nonaqueous dispersion type resinous liquid.
Another aspect of the present invention resides in a surface regulating agent to be used in combination with a strippable paint including a nonaqueous dispersion type resinous liquid including a solvent containing aromatic hydrocarbon in an amount ranging from 30 to 45% by weight relative to the solvent, and acrylic copolymer resin particle dispersed in the solvent in an amount ranging from 20 to 30% by weight relative to the nonaqueous dispersion type resinous liquid. The acrylic copolymer resin particle is formed of acrylic copolymer having a chain structure including at least one of acrylic acid monomer and methacrylic acid monomer having ethylenic unsaturated bond and carboxyl group. The acrylic copolymer resin particle has an acid value of not lower than 90 and a glass transition temperature ranging from 25 to 40° C. Diethylene glycol monoether is contained in the nonaqueous dispersion type resinous liquid in an amount ranging from 7 to 13% by weight of a resinous solid content of the nonaqueous dispersion type resinous liquid. Polyether-chemically modified polysiloxane compound is contained in the nonaqueous dispersion type resinous liquid in an amount ranging from 0.5 to 2% by weight of the resin solid content of the nonaqueous dispersion type resinous liquid. Here, the above-mentioned surface regulating agent comprises diacetone alcohol in an amount of not less than 90% by weight.
A further aspect of the present invention resides in a release agent to be used in combination with a nonaqueous dispersion type resinous liquid including a solvent containing aromatic hydrocarbon in an amount ranging from 30 to 45% by weight relative to the solvent, and acrylic copolymer resin particle dispersed in the solvent in an amount ranging from 20 to 30% by weight relative to the nonaqueous dispersion type resinous liquid. The acrylic copolymer resin particle is formed of acrylic copolymer having a chain structure including at least one of acrylic acid monomer and methacrylic acid monomer having ethylenic unsaturated bond and carboxyl group. The acrylic copolymer resin particle has an acid value of not lower than 90 and a glass transition temperature ranging from 25 to 40° C. Diethylene glycol monoether is contained in the nonaqueous dispersion type resinous
Katano Akihide
Kinoshita Keigo
Oki Kunio
Sakaki Tetsushi
Foley & Lardner
Michl Paul R.
Nissan Motor Co. Ltd
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