Fabric (woven – knitted – or nonwoven textile or cloth – etc.) – Coated or impregnated woven – knit – or nonwoven fabric which... – Coating or impregnation specified as water repellent
Reexamination Certificate
1999-07-30
2001-10-30
Morris, Terrel (Department: 1771)
Fabric (woven, knitted, or nonwoven textile or cloth, etc.)
Coated or impregnated woven, knit, or nonwoven fabric which...
Coating or impregnation specified as water repellent
C442S079000
Reexamination Certificate
active
06309984
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an agent for treating a water repellency supply cloth and a water repellency supply cloth. More specifically, it relates to a water repellency supply cloth capable of supplying water repellency to the body of a car by simply wiping the body of the car and an agent for treating a water repellency supply cloth employed for this water repellency supply cloth.
2. Description of the Prior Art
In order to supply water repellency to the body of a car, a product prepared by adding dimethylpolysiloxane or fluororesin to the main component of natural wax or synthetic wax is generally employed after car washing.
However, this product has such problems that considerable time is required for a series of operations for sufficiently wiping out water after car washing, applying wax to the body of the car, drying a solvent and polishing the body of the car supplied with the wax, the wax feels heavy when polishing the body of the car, the body of the car cannot be polished with a good shine, and the like.
In order to overcome such problems, the inventors have developed a water repellency supply cloth prepared by impregnating woven or nonwoven fabric with an organopolysiloxane solution of trimethyl siloxy silicate, and submitted a patent application (Japanese Patent Application No. 9-296144 (1997), 10-192291(1998)). According to this water repellency supply cloth, a water-repellent film can be readily formed on the body surface of a car without completely wiping out waterdrops remaining on the body of the car, by simply wiping the body surface with the cloth.
However, although this water repellency supply cloth can attain a water-repellent effect to some extent, the formed water-repellent film is immediately washed out due to inferior fixability to the body of the car. When the car is once caught in the rain or mud adhering to its surface is washed out with water, therefore, the water repellency is lost. Thus, the water-repellent film formed by the conventional water repellency supply cloth is disadvantageously inferior in persistence.
SUMMARY OF THE INVENTION
The present invention has been proposed in consideration of the aforementioned problems of the prior art, and an object thereof is to improve fixability and persistence of a water-repellent film formed by a water repellency supply cloth.
The inventors have made deep study to find out that the aforementioned problems can be solved by introducing a specific trimethyl siloxy silicate derivative, and completed the present invention.
The present invention aims at handily forming a water-repellent film having excellent persistency on the body surface of a car. An agent for treating a water repellency supply cloth according to the present invention contains an organopolysiloxane solution of trimethyl siloxy silicate expressed in the following general formula (1), along with a trimethyl siloxy silicate derivative having free hydroxyl groups:
[(CH
3
)
3
SiO
½
]
X
.[SiO
2
]
Y
(1)
where X=1 to 3 and Y=0.5 to 8.
The aforementioned trimethyl siloxy silicate derivative having free hydroxyl groups is preferably blended by 10 to 60 parts by weight with respect to 100 parts by weight of trimethyl siloxy silicate.
The agent for treating a water repellency supply cloth according to the present invention further contains amino modified dimethylpolysiloxane, a surface active agent and/or organic or inorganic fine powder.
A water repellency supply cloth according to the present invention is prepared by impregnating cloth with a nonvolatile component in the aforementioned agent for treating a water repellency supply cloth according to the present invention.
This water repellency supply cloth preferably contains a nonvolatile component corresponding to 1.0 to 50.0 parts by weight of the aforementioned agent for treating a water repellency supply cloth with respect to 100 parts by weight of the cloth, for which ultrafine fiber of less than 0.3 denier is employed.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The agent for a water repellency supply cloth according to the present invention is mainly composed of an organopolysiloxane solution of trimethyl siloxy silicate expressed in the following formula (1) and contains a trimethyl siloxy silicate derivative having free hydroxyl groups dissolved in an organic solvent or dispersed in water, with addition of amino modified dimethylpolysiloxane, a surface active agent and/or fine powder at need. The present invention aims at improving fixability of a water-repellent film prepared from trimethyl siloxy silicate, organopolysiloxane and the like by adding a trimethyl siloxy silicate derivative having free hydroxyl groups to an organopolysiloxane solution of trimethyl siloxy silicate.
[(CH
3
)
3
SiO
½
]
X
.[SiO
2
]
Y
(1)
where X=1 to 3 and Y=0.5 to 8.
Organopolysiloxane employed in the present invention is preferably prepared from methylpolysiloxane or dimethylpolysiloxane, for example, which is nonvolatile at the ordinary temperature. More specifically, this organopolysiloxane is prepared by dissolving 30.0 to 60.0 percent by weight of trimethyl siloxy silicate in methylpolysiloxane or the like having viscosity in the range of 5 to 10,000 cst (25?). Examples of such organopolysiloxane are KF-7312K, KF-9021 and X-21-5250 by Shin-Etsu Chemical Co., Ltd., DC-593 and BY11-018 by Toray Dowcorning Silicone, VP-1038 by Wackerchemicals East Asia Ltd. and the like.
This organopolysiloxane solution of trimethyl siloxy silicate is blended to be impregnated by 0.5 to 25 parts by weight, preferably by 1 to 10 parts by weight, as trimethyl siloxy silicate with respect to 100 parts by weight of cloth. The cloth cannot attain a sufficient water repellency supply effect if the amount of the organopolysiloxane solution is smaller than 0.5 part by weight, while the cloth gets sticky to result in unpreferable feeling if the amount exceeds 25 parts by weight.
The agent for treating a water repellency supply cloth according to the present invention, which is mainly composed of an organopolysiloxane solution of trimethyl siloxy silicate, contains a trimethyl siloxy silicate derivative having free hydroxyl groups as an essential component, in order to improve the fixability of the water-repellent film. This trimethyl siloxy silicate derivative having hydroxyl groups is a linear or cyclic derivative prepared by partially substituting hydroxyl groups for methyl groups of trimethyl siloxy silicate expressed in the above formula (1). Examples of the derivative are Trefil R-910 by Toray Dowcorning Silicone, Silicone Resin MK by Wackerchemicals East Asia Ltd. and the like. Due to the addition of this trimethyl siloxy silicate derivative having hydroxyl groups, the formed water-repellent film is more stably fixed to the surface of the coating of the car and improved in persistency.
The trimethyl siloxy silicate derivative having hydroxyl groups is blended to be 10 to 60 parts by weight, preferably 20 to 50 parts by weight with respect to 100 parts by weight of trimethyl siloxy silicate. The effect of the added trimethyl siloxy silicate derivative having hydroxyl groups cannot be sufficiently attained if the amount thereof is smaller than 10 parts by weight, while no sufficient effect corresponding to the amount of addition can be attained if the derivative is blended in excess of 60 parts by weight.
In the present invention, amino modified dimethylpolysiloxane readily adsorbed by the surface of the coating can be employed as well. Amino modified dimethylpolysiloxane serves as an adjuvant improving the water repellency and fixability of the organopolysiloxane solution of trimethyl [siloxi] siloxy silicate. Amino modified dimethylpolysiloxane having excellent adsorbability is first adsorbed in the body surface of a body to form a base facilitating fixation of the organopolysiloxane solution of trimethyl siloxy silicate. Thus, the persistency of the wat
Hidaka Ryutaro
Nonaka Jun-ichi
Armstrong Westerman Hattori McLeland & Naughton LLP
Morris Terrel
Ruddock Ula C.
Soft 99 Corporation
LandOfFree
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