Abstract: The present invention provides a golf ball having good shot feel and controllability and showing excellent rebound characteristics to give long flight distance. The golf ball of the present invention includes a core and a cover present on the core, an intermediate layer optionally being present between the core and the cover, wherein at least one layer of the cover or the intermediate layer has a thickness of 1 to 3 mm and is formed from a composition having an elasticity modulus (E*) at -30.degree. to +20.degree. C. of 1,000 to 9,000 Kgf/cm.sup.2 and a loss tangent at -30.degree. to +20.degree. C. of 0.02 to 0.1., and the core, whether solid core or thread wound core, has a spring constant at compression deformation of 15 to 60 Kgf/mm.

Abstract: A golf ball is provided which changes color or other indicia after significant immersion in water to indicate that the ball has been recovered from a water hazard and may not have predictable flight characteristics which may result in loss of carry and roll. In one embodiment, a microencapsulated dye layer is formed immediately below the final gloss coat, with controlled dye release causing a stained look to the ball after significant immersion in water.

Abstract: A is a golf ball having good shot feel and controllability as well as excellent flight performance, which comprises a core and a cover covering the core, wherein the cover has a Shore D hardness of from 60 to 65 and a stiffness modulus of from 2,000 to 2,500 kgf/cm.sup.2 and is formed from a specific mixture of three ionomer resins.

Abstract: A wound golf ball comprising a center, a thread rubber layer and a cover has a weight of 40-45 grams and a distortion of 2.6-3.6 mm under a load of 100 kg. The center has an outer diameter of 30-35 mm and a distortion of 1.6-4 mm under a load of 30 kg. The cover has a Shore D hardness Hd of 50-68 and a gage of 1.2-2.2 mm. A percent overall dimple volume Vr which is defined as the sum of the volumes of dimple spaces each below a circular plane circumscribed by the dimple edge divided by the volume of the ball satisfies: (0.985-0.002 Hd).ltoreq.Vr.ltoreq.(1.085-0.002 Hd). The ball launches at a greater launch angle and initial velocity upon driver full shots at low head speed, traveling a longer distance.

Abstract: A golf ball is prepared by forming a cover of two layer structure consisting of an inner layer and a thin outer layer on a core by heat compression molding. A color difference .DELTA.E in Lab color space between the inner and outer layers is up to 3. Tracks of seams and streaks on the inner layer at the parting line are visually unperceivable, and the ball is good looking.

Abstract: The present invention refers to a golf ball having projections in a form of dome, in a form of cut sphere, in a form of polyhedron, in a form of spherical polyhedron, in a form of which the base is in polygon and the sides are round and plane like the side of cut cone, in a form of which the base is in circle and the sides are round and plane like the side of cut cone or with a small dome put on each of cut top. The surface of the said inner cover can be made of projections of one kind on the whole or projections of a different kind. Meanwhile, it is possible to make the projections of one kind or more than two kinds that are different in a size or height. The said projections also may be apart from each other at regular intervals or may be in contact with each other, and in some cases, some projections may be in contact and some projections apart from each other.

Abstract: A golf ball comprising; a core and a multi-layered cover having an innermost layer enclosing the core, at least one intermediate layer enclosing the innermost layer, and an outermost layer enclosing the at least one intermediate layer. The innermost layer is composed of an ionomer resin, polyester elastomer, polyamide elastomer or polyurethane elastomer. The at least one intermediate layer is composed of an ionomer resin. The outermost layer is composed of an ionomer resin, ethylene-vinyl acetate copolymer, polyurethane or polyethylene or a mixture thereof, and the at least one intermediate layer includes at least one layer which is harder than the innermost layer and the outermost layer.

Abstract: A wound golf ball is constructed by winding thread rubber on a center ball and enclosing with a cover. The center ball consists of a center core having a diameter of 20-37 mm and experiencing a distortion of 1-5 mm under a load of 100 kg and an enclosure layer having a Shore D hardness of 33-54 and has a diameter of 33-38 mm. The center core comprises a rubber composition comprising a base rubber, a co-crossing linking agent and a peroxide and being free of an oily substance. The cover consists of an inner layer having a Shore D hardness of 55-68 and an outer layer having a Shore D hardness of 30-58, the inner layer being harder than the outer layer by at least 5 in Shore D hardness. The ball is not only improved in spin, control, and flight distance on driver and approach shots, but also gives pleasant hitting feel with click.

Abstract: The invention provides a wound golf ball comprising a liquid center in the form of a center bag filled with a liquid, a thread rubber layer, and a cover. The liquid is based on water and has a viscosity of 1 to 500 centipoises at 20.degree. C. The liquid center has a diameter D of 26-32 mm. The relationship: (A.times.B)/D.ltoreq.4.5 is met wherein A is a gage as expressed in mm and B is a hardness on JIS A scale of the center bag. A hysteresis loss of up to 7% is recorded when the liquid center is deformed to 50% of its diameter. The ball has a pleasant hitting feel and a reduced spin rate, and travels a longer distance.

Abstract: In a wound golf ball comprising a center ball having thread rubber wound thereon and a cover, the center ball consists of a center core having an outer diameter of 27-37 mm and a distortion of 3.5-10 mm under a load of 100 kg and an enclosure layer having a Shore D hardness of 55-68. The center ball has an outer diameter of 33-38 mm. The center core comprises a rubber composition having a base rubber, a co-cross linking agent and a peroxide and being free of an oily substance. The ball is improved in spin, control and flight distance at any head speed from high to low ranges so that players may favorably use it independent of their skill or head speed.

Abstract: A wound golf ball comprising: a center ball, thread rubber wound thereon, and a cover, wherein the center ball consists of a center core having an outer diameter of up to 37 mm and a distortion of 1 to 5 mm under a constant load of 100 kg and an enclosure layer enclosing the center core and having a Shore D hardness of up to 54. The center ball has an outer diameter of 33 to 38 mm, and the center core comprises a rubber composition having a base rubber, a co-cross linking agent and a peroxide and being free of an oily substance.

Abstract: A golf ball includes a cover and a coating formed on the cover, and dimples are formed in a layer composed of the cover and the coating. The coating is formed of a material having contraction and expansion properties and a higher heat resistance than the material for the cover and has a thickness of at least 15 .mu.m. In a process for producing the golf ball, after the formation of the coating, dimples are formed through the coating by conducting compression molding at a molding temperature near the melting point of the cover. In the golf ball, dimples can be precisely shaped and sharp edged through precise reproduction of design values of dimples. Moreover, the golf ball does not require deburring after dimple formation, thereby preventing a reduced preciseness of dimple shape and resultant variations in quality.

Abstract: The present invention provides a thread-wound golf ball comprising a thread rubber ball prepared by winding thread rubber around a spherical solid center and a cover enclosing the thread rubber ball therein, wherein the solid center satisfies the following equations (1) to (3):.alpha.=26 to 34 (mm) (1)10.0-0.25.alpha.(mm)<.beta.<13.0-0.25.alpha.(mm) (2).gamma./.alpha.<0.11 (3)where .alpha. is the diameter of the solid center, .beta. is the deformation of the solid center under a load of 30 kg at room temperature, and .gamma. is the deformation of the solid center frozen through the use of dry ice as measured 1 minute after application of a load of 50 kg to the frozen solid center at room temperature. The thread-wound golf ball has stable quality due to an undeformed solid center and provides a long travel distance through the use of a large-diameter, low-hardness solid center.

Abstract: A thread wound golf ball comprises a solid center and a wound core having a thread rubber layer formed by winding thread rubber around the center and a cover enclosing the wound core. The cover is based on a non-yellowing thermoplastic polyurethane elastomer, and the difference in specific gravity between the center and the cover is 0.2 or less.

Abstract: A wound golf ball is constructed by winding thread rubber on a center ball and enclosing with a cover. The center ball consists of a center core having a diameter of 27-37 mm and experiencing a distortion of 3.5-10 mm under a load of 100 kg and an enclosure layer having a Shore D hardness of 55-68 and has a diameter of 33-38 mm. The cover consists of an inner layer having a Shore D hardness of 55-68 and an outer layer having a Shore D hardness of 30-58, the inner layer being harder than the outer layer by at least 5 in Shore D hardness. The ball is improved in spin, control and flight distance at any head speed from high to low ranges so that players may favorably use it independent of their skill or head speed.

Abstract: A thread wound golf ball comprises a liquid center and a wound core having a thread rubber layer formed by winding thread rubber around the center and a cover enclosing the wound core. The cover is based on a non-yellowing thermoplastic polyurethane elastomer, and the difference in specific gravity between the center and the cover is 0.2 or less.

Abstract: The present invention is directed towards a multi-layer golf ball cover formed by a sandwich injection molding process, wherein said golf ball cover comprises an inner layer and an outer layer of a first material and an intermediate layer therebetween of a second material. The present invention is directed towards a sandwich injection molding process for forming a multi-layer golf ball cover involving the steps of pushing a measured amount of a plasticized first material into one end of an accumulation cylinder, pushing a measured amount of a plasticized second material into the opposite end of the accumulation cylinder, and injecting both materials in a single plunging step, so that the first material substantially coats the surface of the mold while the second material substantially fills the interior of the first material.

Abstract: The present invention provides a thread wound golf ball which has good shot feel and good controllability, and attains long flight distance. The thread wound golf ball of the present invention comprises(a) a solid center,(b) a thread rubber layer formed on the solid center, and(c) a cover having a two-layer structure of an inner layer cover and an outer layer cover, the inner layer cover being formed on the thread rubber layer and the outer layer cover being formed on the inner layer cover,wherein the solid center has a diameter of from 29 to 35 mm, the cover contains an ionomer resin as a main component, the inner layer cover has a flexural modulus of from 300 to 600 MPa, and the outer layer cover has a flexural modulus of from 50 to 290 MPa.

Abstract: Disclosed is a coated golf ball having a constant film thickness even at the edge part of the dimple.The coated golf ball is obtained by coating a paint on a golf ball having dimples on the surface. The paint is an polyurethane paint and/or epoxy resin paint and contains silica, clay, calcium carbonate or a mixture thereof in an amount of 0.1 to 3% by weight based on 100 parts by weight of the paint resin solid content.

Abstract: A thread-wound golf ball prepared by winding thread rubber around a center, and having a two layer cover. The inner cover is made of an ionomer resin mixture or blend of ionomers having an acid content of not greater than 15 percent by weight, and a melt flow rate measured at 190.degree. C. of from 2 to 9. The outer cover is made of a resin having a hardness of 43 to 53 on the Shore D scale.

Abstract: The present invention provides a multi-layer structure golf ball using a thread wound core, which has good shot feel and attains long flight distance. The golf ball comprises a thread wound core composed of a solid center and thread rubber layer on the center, and a cover covering the thread wound core, the cover having two layered structure comprising an inner layer cover and an outer layer cover, wherein the inner layer cover has a specific gravity of 1-1.8 and a thickness of 0.5-3 mm, the outer layer cover has a specific gravity of 0.9-1.1 and a thickness of 1-3 mm, the specific gravity of the inner layer cover is larger than that of the outer layer cover, the solid center has a diameter of from 28 to 35 mm, the thread rubber has a thickness of from 1 to 5.5 mm, and a ratio of (diameter (mm) of the solid center)/(amount of deformation (mm) formed by applying a load of from an initial load of 10 Kg to a final load of 130 Kg to the thread wound core) is from 5 to 15.

Abstract: A thread-wound golf ball comprising: a thread rubber ball prepared by winding thread rubber around a spherical center, and a cover enclosing the thread rubber ball therewith, which golf ball has a deformation under a load of 100 kg of from 2.5 to 3.7 mm, and wherein the center has an intrinsic frequency of from 2,000 to 4,000 Hz, an outer diameter of from 31 to 35 mm, a deformation under a load of 30 kg in the range of 1.2 to 2.6 mm, and a weight of from 19.5 to 29.0 g.

Abstract: In a wound golf ball comprising a center ball (1), thread rubber (2), and a cover, the cover consists of a first layer (3) on the wound center and a second layer (4) on the first layer. The first layer (3) is 0.5-3.0 mm thick. The second layer (4) is 10-300 .mu.m thick. The second layer (4) may be formed by either (a) injection molding a resin composition to enclose the first layer (3) or (b) press molding a resin composition film wrapped around the first layer (3). Dimples may be embossed in the first layer (3) before the second layer (4) is formed thereon. Preferably, dimples are embossed after the second layer (4) is formed on the first layer (3). The ball affords improved spin and flying distance and is fully durable.

Abstract: The present invention provides a golf ball which exhibits a soft hit feeling and a high impact resilience. The golf ball comprises a core made of an elastomer and a cover covering said core wherein said cover is made of a thermoplastic material comprising a rubber powder and a thermoplastic elastomer, said rubber powder being present in an amount of 5 to 40 parts by weight based on 100 parts by weight of said thermoplastic elastomer.

Abstract: The present invention provides a golf ball which is superior in shot feel and controllability, and is superior in flight performance, durability and cut resistance and also have sufficient safety. The golf ball comprises a solid center, a thread rubber layer formed on the solid center and a cover formed on the thread rubber layer,wherein the solid center is composed of an inner spherical rubber formed of a vulcanized molded rubber composition containing an oily substance, and a coating layer of an oil-resistant substance for coating around the inner spherical rubber so as to prevent the bleeding of the oily substance of the inner spherical rubber, andthe cover contains an ionomer resin as a main component and a cover composition constituting the cover has a stiffness modulus of from 70 to 280 MPs.

Abstract: The invention relates to a golf ball having a substantially spherical inner core, a layer of high tensile elastic modulus fibers wound about the inner core, and a molded layer of a polymeric material surrounding the wound layer. The high tensile elastic modulus fibers have a tensile elastic modulus of at least 10,000 kpsi. The invention also relates to a method of making a golf ball and includes providing an inner core, winding a high tensile elastic modulus fiber on the inner core to create a wound layer, and molding an outer layer of polymeric material about the wound layer. The inner core may be made of resilient materials or a center wound with a low modulus fiber and provided with an initial tension.

Abstract: A two-layer cover structure having a hard inner layer and a soft outer layer, wherein the flight distance attained by using a driver or iron are increased and the ease of stopping the ball when making an approach shot is improved. The golf ball of the present invention comprises a core (1) and a cover formed on the core, wherein the cover has a two-layer cover structure of a hard inner cover layer (2) and a soft outer cover layer (3), and the inner cover layer (2) comprises a high-rigid polyamide resin present in an amount of not less than 5% by weight based on the total weight of the inner cover components.

Abstract: The present invention provides a thread-wound golf ball comprising a thread rubber ball prepared by winding thread rubber around a spherical solid center, and a cover enclosing the thread rubber ball therewith, which has a number of dimples of from 350 to 500 and a dimple volume rate of 0.76 to 0.9 percent, and wherein the solid center has an outer diameter of from 27 to 38 mm, a deformation under a load of 30 Kg of from 1.5 to 3.5 mm and a rebound, when dropped from a height of 120 cm, of at least 96 cm. The thread-wound golf balls of the present invention show good spin properties in addition to good restitution properties, resulting in improved travel distance.

Abstract: A method for manufacturing hemispherical shells for covering a golf ball core, which comprises: mixing a quantity of balata sufficient to form a desired number of hemispherical shells configured and adapted for covering golf ball cores; transferring a predetermined quantity of the mixed balata to an extruder and extruding a plurality of strands of the balata at a temperature of between about 140.degree. and 280.degree. F.; cutting the strands into pellets of a desired size and injection molding the pellets into a hemispherical shell.

Abstract: In a wound golf ball comprising a wound core (3) having thread rubber wound on a center (1) to form a thread rubber layer (2) thereon and a cover (4) around the wound core, the thread rubber layer (2) consists of an inner lamina (2a) of lightly wound thread rubber, an intermediate lamina (2b) of tightly wound read rubber, and an outer lamina (2c) of lightly wound thread rubber. The inner lamina occupies 10-35% of the tread rubber volume, the intermediate lamina 35-70% of the tread rubber volume and the outer lamina is 45% of the tread rubber volume. The inner and outer lamina have an elongation which is at least 40% lower than the elongation of the intermediate lamina.

Abstract: Disclosed is a golf ball having excellent hit feeling, control properties and flying performances. The golf ball has a core and a cover for covering the core. The base resin of the cover comprises a mixture of three specific resins (A), (B), and (C), and the cover has a stiffness modulus of 130 to 300 MPa and a Shore D hardness of 43 to 58. Resin (A) is a high rigid ionomer resin or resin mixture, Resin (B) is a moderate rigid ionomer resin or resin mixture, and Resin (C) is a low rigid copolymer resin.

Abstract: In a wound golf ball comprising a solid center (1), thread rubber (2), and a cover (3), the cover has a multi-layer structure including an outer layer (4) and an inner layer (5) having a higher hardness than the outer layer. The outer layer (4) is 0.4-3.0 mm thick, and it is formed of a first ionomer resin having a Shore D hardness of 40 to 55. The inner layer is formed of a second ionomer resin having a Shore D hardness of 55 to 68. The difference in hardness between the first and second ionomer resins is at least 5 in Shore D hardness. The ball affords improved spin and durability.

Abstract: A thread-wound golf ball includes a wound core (3) consisting of a center (1) and a thread rubber layer (2) thereon, and a cover (4) having a plurality of dimples (5). The core (3) wherein the thread rubber layer (2) has a thickness of 5 to 9 mm and a larger weight than the center (1) is enclosed in the cover (4) made of an ionomer resin having a thickness of 1 to 2.5 mm and a Shore D hardness of 52 to 68. The ball has an outer diameter of 42.9 to 46 mm. The total volume of dimples is 300 to 400 mm.sup.3. The ball having a relatively large diameter and an increased amount of thread rubber provides an increased flying distance and improved feeling on impact.