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US 4,056,269 AGranted
Homogeneous molded golf ball
AssigneePrinceton Chemical Research, Inc.
InventorsDuncan H. Pollitt, Murray H. Reich
Life of this patent
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AssigneePrinceton Chemical Research, Inc.
InventorsDuncan H. Pollitt, Murray H. Reich
Estimating the term…
In a homogeneous molded golf ball comprising a filled elastomer highly cross-linked into a three dimensional network with long, flexible cross-links formed of a polymerized cross-linking monomer, the improvement which comprises using as said cross-linking monomer a metal-containing cross-linkable monomer whereby said comonomer simultaneously functions as said filler at least in part. The preferred elastomer is cis-polybutadiene. The metal-containing cross-linkable monomer can be formed in situ or added as such and preferably comprises a salt of at least one metal selected from the group consisting of zinc, magnesium and calcium, and at least one acid selected from the group consisting of methacrylic, acrylic, cinnamic, acotinic, crotonic, vinylacetic, itaconic, styrenesulfonic and benzoylacrylic acids. Additional filler may be added to adjust the density to the desired value. The composition is preferably preheated prior to molding and produces golf balls of superior properties with respect to durability, cannon life, sound and distance properties.
In a homogeneous molded golf ball having the density and click and rebound required in a golf ball and comprising filled cis-polybutadiene elastomer highly cross-linked into a three dimensional network with long, flexible cross-links formed of a polymerized cross-linking monomer, the improvement wherein said cross-linking monomer comprises a polyvalent metal salt of an unsaturated acid and is present in about 0.046 to 0.41 equivalents per mole of elastomer base whereby said comonomer simultaneously functions as said filler at least in part, said ball in addition to said filler-functioning cross-linking monomer containing up to about 30 parts of a further filler per 100 parts by weight of said elastomer, the amount of said further filler being sufficient to impart to said golf ball a weight of about 1.500 to 1.620 ounces.
In the process for producing a homogeneous molded golf ball comprising filled cis-polybutadiene elastomer highly cross-linked into a three dimensional network with long flexible cross-links comprising molding an intimate mixture of cis-polybutadiene, a cross-linkable monomer, a metal containing filler, and a free radical catalyst, the improvement which comprises using as said cross-linkable monomer about 0.046 to 0.41 moles per mole of elastomer base of a polyvalent metal salt of an unsaturated acid whereby it simultaneously functions as said filler at least in part.
A solid unitary golf ball prepared from a composition comprising 100 parts of polybutadiene having a cis 1,4 polybutadiene content of at least 40% and a divalent metal salt of a monethylenically unsaturated carboxylic acid present in sufficient quantity to cross-link said polybutadiene and form said solid unitary golf ball when said composition is cured in a standard golf ball mold at a temperature between 266.degree. and 392.degree. F. for from 1 to 50 minutes.
Dependencies are inferred from the claim text.