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
2001-03-14
2003-01-21
Cain, Edward J. (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...
Reexamination Certificate
active
06509410
ABSTRACT:
BACKGROUND OF THE INVENTION
(1) Field of the Invention
The present invention relates to an aqueous coating composition for golf ball, capable of forming a coating film of high durability superior in impact resistance, abrasion resistance, contamination resistance, etc., as well as to a golf ball coated with the coating composition.
(2) Description of Related Art
Two-pack type urethane resin coatings are in wide use for various reasons such as (a) they can form a cured film even at ordinary temperatures, (b) the urethane linkage formed thereby is chemically stable and has high water resistance, chemical resistance, etc., and (c) the polyol and polyisocyanate used as the raw materials can be selected widely and the designing of a coating having desired physical and chemical properties can be made at a high freedom. Conventional urethane resin coatings, however, use a large amount of a volatile organic solvent and this has various problems such as handling of hazardous substance, air pollution, offensive odor, waste disposal, aggravation of coating environment, and the like. A recent movement for protection of global environment has accelerated the development of powder coating, ultraviolet-curing coating and aqueous coating. European countries and U.S.A are advanced in the development of coatings of hazard-free and resource saving type, and aqueous coatings are a main stream. Specific forms of aqueous coatings are aqueous solution, emulsion and colloidal dispersion. In the aqueous solution (of resin), the resin used is allowed to have a functional group for hydrophilicity; a curing agent is used except for when the resin is a particular alkyd resin; and heating and drying at high temperatures is necessary. In the emulsion and colloidal dispersion, hydrophobic polymer particles have, on the surfaces, an ion, a hydrophilic polymer, a low-molecular emulsifier, etc. adsorbed or absorbed; and the coating film formed has excellent water resistance and durability. These aqueous coatings, as compared with organic solvent type coatings, are inferior in film properties and have problems in application to a golf ball which requires impact resistance, abrasion resistance and contamination resistance. There is a description on an aqueous two-pack type polyurethane coating for golf ball, in U.S. Pat. No. 5,830,938. In this coating, however, the hydroxyl value determined from the hydroxyl equivalent of the polyol used is as low as 37 to 14, which does not satisfy the impact resistance, abrasion resistance, contamination resistance, etc. intended by the present invention.
In order for a coating to be able to form a coating film satisfactory in impact resistance, abrasion resistance, contamination resistance, etc., the coating film formed must be tough. In order to achieve it, the materials used in the coating need to have structural hardnesses and a crosslinked structure must be formed between polymer molecules. Urethane resins are most appropriate in the availability of the raw materials, the controllability of their reaction, and the achievability of required properties. Hence, it has been desired to develop, from an aqueous urethane resin, a coating for golf ball, capable of forming a film equivalent to that formed by solvent type urethane coatings.
SUMMARY OF THE INVENTION
The present inventors made a study in order to alleviate the above problems. As a result, the present invention has been completed. The present invention lies in the following (1) to (10).
(1) An aqueous coating composition for golf ball, comprising:
a water-soluble urethane polyol having a hydroxyl value of 100 to 300 mgKOH/g, obtained by reacting a polyol component and a polyisocyanate component, and
a hydrophilic group-containing polyisocyanate.
(2) An aqueous coating composition for golf ball, comprising:
a water-soluble urethane polyol having a hydroxyl value of 100 to 300 mgKOH/g, obtained by reacting a polyol component and a polyisocyanate component,
a water-dispersible urethane resin, and
a hydrophilic group-containing polyisocyanate.
(3) An aqueous coating composition for golf ball, comprising:
a water-soluble urethane polyol having a hydroxyl value of 100 to 300 mgKOH/g, obtained by reacting a polyol component and a polyisocyanate component,
a water-dispersible acrylic resin, and
a hydrophilic group-containing polyisocyanate.
(4) The aqueous coating composition for golf ball according to any of the above (1) to (3), wherein at least part of the polyol component is a polyol having an alicyclic structure.
(5) The aqueous coating composition for golf ball according to any of the above (1) to (3), wherein at least part of the polyol component is a polyester polyol obtained by reacting a polybasic acid having an alicyclic structure, with a polyol.
(6) The aqueous coating composition for golf ball according to any of the above (1) to (3), wherein at least part of the polyol component is a polyester polyol obtained by reacting a polyol having an alicyclic structure, with a polybasic acid.
(7) The aqueous coating composition for golf ball according to the above (1), wherein at least part of the polyol component is a polyester polyol obtained by reacting a polyol having an alicyclic structure, with a polybasic acid having an alicyclic structure.
(8) The aqueous coating composition for golf ball according to the above (3), wherein at least part of the water-dispersible acrylic resin is a water-dispersible acrylic resin having an isocyanurate ring.
(9) The aqueous coating composition for golf ball according to any of the above (1) to (3), wherein the hydrophilic group-containing polyisocyanate is a hydrophilic group-containing polyisocyanate having an isocyanurate ring.
(10) A golf ball obtained by coating a golf ball body with the aqueous coating composition set forth in any of the above (1) to (3).
DETAILED DESCRIPTION OF THE INVENTION
The water-soluble urethane polyol used in the present invention is a compound having a hydroxyl value of 100 to 300 mgKOH/g, obtained by subjecting a polyol component and a polyisocyanate component to urethanization. The hydroxyl value range of 100 to 300 mgKOH/g possessed by the water-soluble urethane polyol can promise a coating film having intended property levels in impact resistance, abrasion resistance, contamination resistance, etc.
The polyol component is a polyol having, in the molecule, groups necessary for obtaining sufficient water solubility, or a mixed polyol of the above polyol and other polyol. The mixed polyol is preferred because it makes easy the designing of a water-soluble urethane polyol having required properties.
Preferably, at least part of the polyol component, specifically 5 to 60% of the total polyols (including the raw materials for synthesis of polyester polyol, etc.) is a polyol having an alicyclic structure. Also preferably, at least part of the polyol component is a polyester polyol obtained by reacting a polybasic acid containing 10 to 70% of a polybasic acid having an alicyclic structure, with a polyol. Also, the polyol component may be a polyester polyol obtained by reacting a polyol partially containing a polyol having an alicyclic structure, with a polybasic acid, or a polyester polyol obtained by reacting a polyol partially containing a polyol having an alicyclic structure, with a polybasic acid partially containing a polybasic acid having an alicyclic structure.
As the polyol having, in the molecule, groups necessary for obtaining sufficient water solubility, there is preferred a diol having carboxyl group in the molecule, for reasons of raw materials availability, etc. Specifically, there are mentioned dimethylolpropionic acid, 2,2-dimethylolacetic acid, 2,2-dimethylolbutyric acid, 2,2-dimethylolpentanoic acid, dihydroxypropionic acid, dihydroxysuccinic acid, etc.
As the polyol other than the polyol having, in the molecule, groups necessary for obtaining sufficient water solubility, there are specifically mentioned, for example, diols such as ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, 1,6-hexanediol, neopenty
Arai Masayoshi
Nakahama Hisako
Ohira Takashi
Shiyama Katsunori
Bridgestone Sports Co. Ltd.
Cain Edward J.
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