JP2616630B2 - Golf ball - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf ball having a small surface friction coefficient and excellent slipperiness.

[0002]

2. Description of the Related Art In both golf ball and solid golf balls, a clear paint is applied to the outermost layer of a golf ball.

[0003] The role of this coating film is to protect the cover material and improve the aesthetic appearance by imparting gloss to the ball. The properties required for such a golf ball paint include the ability to be repeatedly hit by a golf club. Has impact resistance, abrasion resistance, grass juice contamination resistance, weather resistance, etc.

Conventionally, golf ball coatings used to satisfy the above-mentioned properties are two-pack type urethane resin coatings in which a polyfunctional isocyanate and a polyester polyol are cured in the presence of a catalyst. The ball paint is designed to be flexible and have a large elongation in order to increase the impact strength in comparison with a normal paint in order to improve the impact resistance in repeated hits by a golf club.

That is, a golf ball coated with a stiff, low-elongation coating material easily cracks the coating film by repeated impacts and impairs the appearance of the ball. What produces a film is used.

[0006] However, golf balls coated with conventional paints form a coating film having excellent impact resistance, but the coating film itself is soft, so the surface frictional force is large.
For example, in a system that collects and transports a large amount of golf balls, such as a driving range, a transport path is liable to be clogged due to blocking of the balls and a transport problem due to poor rolling of the balls.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a golf ball which provides good sliding properties while maintaining the impact resistance of a coating film and maintains the sliding properties for a long period of time. And

[0008]

The present inventors have made intensive studies to achieve the above object, and as a result, formed a coating film of a urethane-based coating containing a hydroxyl group-containing organically modified polysiloxane on the surface of a golf ball. As a result, it has been found that the frictional force on the golf ball surface can be reduced while maintaining the impact resistance of the coating film.

That is, conventionally, the frictional force has been reduced by increasing the hardness of the coating film or by adding a small amount of silicone oil. However, the former method causes a decrease in impact resistance due to a decrease in elongation, and the latter method does not have a sufficient chemical connection between the silicone component and the coating film component. During use of the golf ball, the slip imparting component of the coating film was lost, and the slip properties of the golf ball itself tended to decrease.

On the other hand, a coating film obtained by adding a small amount of the above-mentioned hydroxyl-containing organically modified polysiloxane to a urethane-based coating material has excellent impact resistance and slipperiness, and the coating film is chemically bonded even after repeated impacts. No change in slip property was observed.

Furthermore, since the golf ball having the coating film formed on the surface is excellent in slipperiness, especially when used as a practice ball, blocking of the balls when collecting and transporting a large amount of golf balls is performed. Trouble due to poor rolling of the ball and ball is prevented as much as possible, and even when using a golf course, the flight distance (especially the run) increases,
Therefore, it can be suitably used as a golf ball for competition.

Therefore, according to the present invention, the outermost layer is formed of a coating film of a urethane-based paint containing 0.01 to 0.5% by weight with respect to 100% by weight of the resin component in the paint. A golf ball.

Hereinafter, the present invention will be described in further detail. As the hydroxyl-containing organically modified polysiloxane, those which are compatible with the resin component of the urethane-based paint and which can chemically react with the paint resin component when the urethane-based paint is cured are suitable. As such a compound, a compound having a hydroxyl group in the molecule by grafting or block copolymerizing a component having a long-chain alkyl group or ester group in the polysiloxane chain is preferable. In this case, those having an OH value of 5 to 100 mgKOH / g are preferred.

As the hydroxyl-containing organic-modified polysiloxane, commercially available hydroxyl-containing polyester-modified polysiloxane Byk-370 (manufactured by Pick Chemie Japan) can be used.

This hydroxyl-containing organically modified polysiloxane is dissolved in xylene, toluene, methyl cellosolve, butyl acetate and the like, and thus can be used as a solution type using these as a solvent.

As the polyurethane paint, a known two-pack polyurethane paint is preferably used.
When the above-mentioned polysiloxane is blended in the liquid polyurethane paint, it is desirable that the hydroxyl-containing organic modified polysiloxane of the present invention is added to the polyol component in advance, but it is added simultaneously when the isocyanate component and the polyol component are mixed. No problem.

In the present invention, the amount of the hydroxyl-containing organically modified polysiloxane to be added to the paint is 0.01 to 0.5% by weight based on 100% by weight of the resin component in the paint.
In particular, the content is preferably set to 0.02 to 0.2% by weight.
If it is less than 0.01% by weight, a sufficient slipping effect cannot be obtained, and if it exceeds 0.5% by weight, the coating film becomes soft and easily wears.

Here, the golf ball includes a thread-wound golf ball, a solid golf ball such as a one-piece golf ball and a two-piece golf ball, and is particularly suitable for a one-piece golf ball in which the underlying ball itself has a problem of slipperiness.

The coating film used in the present invention may be applied directly to a ground-treated golf ball, or may be applied as a final finish to a ground-treated and white-enameled golf ball. Absent. Further, the coating film is usually clear, but may be a color coating if necessary.

[0020]

The golf ball of the present invention maintains the impact resistance of the coating film and has excellent long-term lubrication.

[0021]

EXAMPLES The present invention will be described below in detail with reference to examples and comparative examples, but the present invention is not limited to the following examples.

[Examples and Comparative Examples] Byk-370 shown in Table 1 was added to a plate test two-pack polyurethane paint.
(25% of a hydroxyl group-containing polyester-modified polydimethylsiloxane) was brush-coated on a vinyl chloride plate, and dried and cured to form a coating film. After leaving this coating film and this for one week at room temperature, it was washed with neutral washing, and the dynamic friction coefficient was evaluated using a HEIDON-14s surface property measuring instrument.

For comparison, the same measurement was carried out for the case where a polyoxyethylene polyalkylsiloxane was added instead of the hydroxyl group-containing polyester-modified polydimethylsiloxane and the case where neither was added.

The results are shown in Table 1. In addition, the addition amount in Table 1 is a weight when the resin component in a coating material is 100 weight part.

[0025]

[Table 1]

Ball test The above five paints are spray-coated on a one-piece ball which has been painted white in advance, and dried and cured at 60 ° C. for 90 minutes to form clear coating films of 20 to 25 μm each.
Two balls were rubbed against each other and the degree of frictional force was evaluated before and after the cleaning (the cleaning method was as described above). Table 2 shows the results.

[0027]

[Table 2]

From the above results, in the plate test, the coefficient of kinetic friction in the example of the present invention was significantly smaller than that of the comparative example, and the change was small even after washing with the detergent. Also, it can be seen that the sliding property is improved and its durability is obtained.

Claims (1)

(57) [Claims] 1. An organically modified hydroxyl-containing polysiloxane is used in an amount of 0.01 to 0.5 with respect to 100% by weight of a resin component in a paint.
A golf ball comprising an outermost layer formed by a coating film of a urethane-based paint containing 10% by weight.