Disclosed herein are polyurethane golf ball compositions. The compositions are prepared by adding a UV absorber to a polyol prior to reacting the polyol with an isocyanate to form a prepolymer, which is then reacted with a curing agent to form the polyurethane.

A golf ball core for use in a multi-piece golf ball includes a solid sphere and between 100 and 300 spaced polygonal protrusions extending from the solid sphere in a radially outward direction. The sphere is substantially formed from an ionomeric material, and has a diameter (D) of between 24 mm and 32 mm. The polygonal protrusions extend from the sphere by a maximum distance of between 0.15 mm and 1.0 mm.

In a golf ball, dimples are arranged on a spherical polyhedron formed by dividing a surface of a sphere using small circles and great circles only on the equator, without arranging the dimples on a spherical polyhedron formed by dividing a surface of a sphere using great circles. The formed spherical polyhedron includes two spherical regular hexagons centered on a pole, twelve near-pole spherical isosceles triangles, twelve near-equator spherical pentagons, and twelve near-equator spherical isosceles triangles, in which the dimples are arranged. Thus, a dimple area ratio may be improved by 2 to 4%, compared to the prior art in which dimples are arranged in spherical polygons of a cubeoctahedron (or an octahedron) divided by great circles.

A multi-piece solid golf ball having a two-layer core with an inner core layer and an outer core layer and having a cover of one or more layer with numerous dimples on the surface is characterized in that the hardest cover layer has a specific material hardness and the ball has a specific value obtained by subtracting the surface hardness of the overall core from the surface hardness of the hardest cover layer, a specific deflection, and a specific value obtained by subtracting the initial velocity of the inner core layer from the initial velocity of the sphere consisting of the inner core layer encased by the outer core layer. This golf ball enables relatively low head speed golfers to achieve a good distance on full shots with drivers and iron clubs and also provides a soft, comfortable feel at impact.

Golf balls and golf ball components made using three-dimensional (3D) additive manufacturing systems are provided. The golf ball includes at least one three-dimensional piece. Preferably, a continuous liquid interface printing method is used to make the three-dimensional structure. Ultraviolet (UV)-light polymerizable materials are used in the method. The method may be used to make single-piece or multi-piece balls. For example, the ball may include an inner core produced by the liquid interface printing method. An outer core layer may be disposed about the inner core, and a cover comprising inner and outer cover layers may encapsulate the core assembly to form the finished golf ball. The outer core and cover layers may be made using conventional molding technologies or the methods of this invention.

The present invention is directed to golf balls having surface textures with unique appearances and improved aerodynamic characteristics due, at least in part, to the use of curvilinear dimple plan shapes. In particular, the present invention is directed to a golf ball that includes at least a portion of its dimples having a plan shape defined by a number of convex or concave arcs that are derived from the vertices of a regular n-sided polygon, for example, an equilateral triangle or square.

Provided is a golf ball having a surface divided by small circles. A surface of a sphere is divided by small circles to generate spherical polyhedrons in order to arrange dimples in the spherical polygons, instead of arranging dimples in spherical polyhedrons that are generated by dividing the surface of the sphere by great circles. According to one or more exemplary embodiments, a land surface of the golf ball, which is generated by arranging the dimples in the spherical polyhedrons, has a dimple area ratio higher than that of a spherical truncated icosahedron of which a surface is divided by great circles on which dimples are arranged. Therefore, a flight distance of the golf ball increases.

The present invention relates to golf balls, specifically to a golf ball comprising an aerodynamic pattern having novel shaped dimple structures which reduce the variation in airflow turning angle thereby improving the golf ball's flight performance. The dimple structures have a conical shaped base with a dimple in the center and reduced or no flat land areas between the dimples.

A golf ball includes plural dimples formed on a surface thereof and plural depressed or protruded portions spaced apart from each other and arranged along an outer periphery of at least one of the plural dimples. The plural depressed or protruded portions each has, as a part of a contour thereof, a shape substantially similar to a part of a contour of the dimple surrounded with the plural depressed or protruded portions. The plural depressed or protruded portions each has a length of more than 1/10 and less than of an outer peripheral length of the dimple surrounded with the plural depressed or protruded portions.

Golf balls having at least one layer comprising a polymer composition comprising a reaction mixture of a base polymer and at least one regenerating-type multi-functional antioxidant. A regenerating-type multi-functional antioxidant has at least two differing moieties selected for example from the group consisting of phenols, phosphites, amines or combinations thereof, and is macromolecular, having a molecular weight of at least 2,000 g/mol. and up to 2,000,000. The at least one layer may comprise at least one regenerating-type multi-functional antioxidant in an amount of from 0.10 to about 2.5 parts by weight per 100 parts by weight of the base polymer, or of less than 0.50 parts by weight per 100 parts by weight of the base polymer, or of less than 0.095 parts by weight per 100 parts by weight of the base polymer. The base polymer can comprise ionomer resin composition(s), polyurethane composition(s) and/or rubber composition(s).