Abstract:
The present invention provides a multi-piece solid golf ball having excellent durability, excellent shot feel when hitting and good productivity. The present invention relates to a multi-piece solid golf ball which includes a solid core having a inner core and at least one outer core layer formed on the inner core, and a cover covering the solid core, wherein the inner core and outer core are formed from the material obtained by dispersing rubber in an ionomer resin and dynamically vulcanizing it with a vulcanizing agent, wherein the rubber particles dispersed in the ionomer resin have a particle size of not more than 10 .mu.m, the outer core layer has a Shore D hardness of more than that of the inner core by 5 to 30, and a weight ratio of the ionomer resin to the rubber particles is within the range of 95:5 to 30:70.
Abstract:
A puncture sealing agent for a tire is at least comprising a rubber latex, an adhesive agent, and an antifreezing agent, wherein propylene glycol is used as the antifreezing agent, and further the ratio of the propylene-glycol to the total weight of the puncture sealing agent is set from 20 to 40% by weight.
Abstract:
The present invention relates to (1) a deproteinizing agent for natural rubber latex, comprising a protease and one or more water-soluble polymers as an active component; (2) a deproteinized natural rubber latex, which is prepared by subjecting to a deprotenization treatment using the deproteinizing agent, and a method of producing the same; (3) a method of producing a rubber product, which comprises incorporating at least a vulcanizing agent into the latex (2), dipping a mold in the resulting compound latex, and vulcanizing and drying a rubber film formed on the mold; and (4) a method of producing a rubber product, which comprises incorporating at least a heat sensitizer and a vulcanizing agent into the latex (2), dipping a mold in the resulting heat-sensitive coagulable compound latex, and vulcanizing and drying a rubber film formed on the mold.
Abstract:
A golf ball comprising a core, a cover, and a clear paint outer layer. The cover comprises 100 parts by weight of an ionomer resin, a light stabilizer and an ultraviolet (UV) absorber such that the total amount of the light stabilizer and the UV absorber is present in an amount of 0.1 to 5 parts by weight based on 100 parts by weight of the cover resin and an amount ratio of the light stabilizer / the UV absorber is from 75/25 to 25/75. The clear paint comprises a light stabilizer and a UV absorber in an amount of 0.1 to 20 parts by weight based on 100 parts by weight of the paint solid and an amount ratio of the light stabilizer / the UV absorber of 75/25 to 5/95. The clear paint further comprises a fluorescent whitening agent in an amount of 0.04 to 1.6 parts by weight based on 100 parts weight of the paint solid.
Abstract:
A puncture sealing agent for sealing an inner surface of a tire comprises a deproteinized rubber latex that is formed by removing protein from a natural rubber latex. The puncture sealing agent includes nitrogen content at 0.1 wt. % or less of rubber solid content of the deproteinized rubber latex, and ammonia content at 0.5 wt. % or less of the rubber solid content.
Abstract:
A thread rubber for golf balls, which has good aging resistance and rebound characteristics, and to a thread wound golf ball using the thread rubber are disclosed. The thread rubber for golf balls has a retention of tensile strength after aging 7 days at 70.degree. C. of not less than 70%, a hysteresis loss at a 100 Kg/cm.sup.2 constant stress tensile of not more than 50% and an elongation at a 100 Kg/cm.sup.2 constant stress elongation within the range of 900 to 1400%.
Abstract:
Disclosed is a golf ball which comprises a core and a cover covering said core, characterized by that said cover comprises a resin component of(a) 10 to 80 wt % of a saponified polymer obtained by saponifying at least a portion of the ester groups of a copolymer of an olefine having 2 to 8 carbon atoms and an unsaturated acrylate having 3 to 8 carbon atoms with an alkali metal selected from the group consisting of Li, Na, K and mixture thereof, and(b) the remaining amount of an ionomer resin.
Abstract:
The present invention provides a thread wound golf ball having excellent durability, heat resistance and impact resilience, which comprises a core, a thread rubber layer and an outer layer. A thread rubber constituting the thread rubber layer comprising a solid rubber containing a high-cis polyisoprene rubber as a main rubber material and a liquid polybutadiene rubber and/or liquid butadiene-isoprene copolymer rubber as a rubber component.
Abstract:
The present invention provides a solid golf ball containing the ultra-high molecular weight polybutadiene which is formulated therein in a solution form. The golf ball has very improved impact resilience and durability. The present invention provides a solid golf ball having at least a resilient portion therein formed from a rubber composition which comprises a base rubber, a crosslinking agent and a co-crosslinking agent, wherein said base rubber comprises a solid polybutadiene prepared by mixing the following components in solution form(a) 5 to 50% by weight of an ultra-high molecular weight polybutadiene rubber which has a cis-1,4-bond of at least 80% and a number average molecular weight of 40.times.10.sup.4 or more, and(b) 95 to 50% by weight of a polybutadiene rubber which has a cis-1,4-bond of at least 80% and a number average molecular weight of less than 40.times.10.sup.4.
Abstract:
Disclosed is a cationic graft-modified natural rubber latex, which is obtained by cationically modifying the graft-natural natural rubber latex with a cationic surfactant in the presence of a nonionic surfactant such as polyoxyalkylene alkyl phenyl ether, polyoxyalkylene monostyryl phenyl ether, polyoxyalkylene distyryl phenyl ether or polyoxyalkylene tristyryl phenyl ether, the obtained rubber latex being useful as an adhesive for fibers and papers.