# US 8,541,497 B2 · Composition and manufacturing methods for grips > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,541,497 B2 - Document ID: US8541497B2 - Status: Granted - Kind: B2 - Application number: 13/570,846 - Filed: 2012-08-09 - Published: 2013-02-07 - Granted: 2013-09-24 - Earliest claimed: 2010-09-14 - Assignees: Lamkin Corporation - Applicants: Robert J. Lamkin; David Claas; Christopher A. Lee; Miguel Angel Bravo; Maria Ramirez; Patricia Marquez; Roberto Rodriguez; Carlos Rodriguez; Moises Lucero; Feliciano Guillen; Iran Saenz; Andrew Kerr; Ernesto Castro; Jorge Gonzalez - Inventors: Robert J. Lamkin; David Claas; Christopher A. Lee; Miguel Angel Bravo; Maria Ramirez; Patricia Marquez; Roberto Rodriguez; Carlos Rodriguez; Moises Lucero; Feliciano Guillen; Iran Saenz; Andrew Kerr; Ernesto Castro; Jorge Gonzalez - Web page: https://patentgrep.com/patent/US8541497B2 ## CPC - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - C08K 3/013: Fillers, pigments or reinforcing additives - C08L 23/22: Copolymers of isobutene; Butyl rubber; Homopolymers or copolymers of other iso-olefins - C08K 5/098: Metal salts of carboxylic acids - C08K 2003/2241: {Titanium dioxide} - C08K 2003/2296: {of zinc} - C08K 2201/014: Additives containing two or more different additives of the same subgroup in C08K - C08L 2312/00: Crosslinking - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A composition for use in grips is disclosed. The composition may be used, for example, in making a golf club grip. The disclosed grip provides for improved shock absorption and other beneficial properties. In one embodiment the comprises a cross-linked composition of from about 40% by weight to about 80% by weight of one or a combination of a first material selected from the group consisting of butyl rubber, nitrile rubber, ethylene propylene rubber and chloroprene rubber, and from about 10% by weight to about 50% by weight of one or a combination of a second material selected from the group consisting of ethylene-propylene-diene copolymer (EPDM), polyurethane, ethylene-vinyl acetate copolymer, polypropylene and cork. ## Claims ### Claim 1 A composition for improving physical and cosmetic characteristics of a golf club grip, the composition comprising a mixture of: (a) from about 15% to about 25% by weight of a viscoelastic rubber comprising at least one or more halogenated rubber; and (b) from about 10% by weight to about 80% by weight of one or a combination of a rubber viscoelastic or non-viscoelastic material comprising ethylene-propylene-diene copolymer (EPDM), styrene-butadiene rubber (SBR), nitrile, polyurethane, ethylene-vinyl acetate copolymer, polypropylene TPE, cork, a silicone polymer microemulsion and a fiber fabric. ### Claim 2 (depends on 1) The composition of claim 1, wherein the halogenated rubber is a butyl, brominated or chlorinated butyl rubber. ### Claim 3 (depends on 1) The composition of claim 1, wherein the halogenated butyl rubber is brominated butyl rubber. ### Claim 4 (depends on 1) The composition of claim 1, wherein the halogenated butyl rubber is chlorinated butyl rubber. ### Claim 5 (depends on 1) The composition of claim 1, wherein the halogenated butyl rubber is a combination of brominated butyl rubber and chlorinated butyl rubber. ### Claim 6 (depends on 1) The composition of claim 1, further comprising from about 10% by weight to about 50% by weight of a filler selected from the group comprising silica, titanium dioxide, calcium carbonate, barium sulfate, silicon dioxide, carbon black, sand, glass beads, ceramic spheres, mineral aggregates, talc, clay and thermoplastic microspheres. ### Claim 7 (depends on 1) The composition of claim 1, further comprising from about 0% by weight to about 8% by weight of a plasticizer selected from the group consisting of naphthenic oils, paraffinic oil, aromatic plasticizers, and hydrotreated naphthenic distillate. ### Claim 8 (depends on 1) The composition of claim 1, wherein the viscoelastic rubber comprises from about 15% by weight to about 25% by weight of halogenated butyl rubber and the non-rubber viscoelastic material comprises from about 20% by weight to about 45% by weight of EPDM. ### Claim 9 (depends on 1) The composition of claim 1, further comprising from about 0% by weight to about 30% by weight of amorphous silicon dioxide. ### Claim 10 (depends on 1) The composition of claim 1, further comprising from about 0% by weight to about 20% by weight of a plasticizer, from about 0% by weight to about 20% by weight of a tackifier, and from about 1% to about 15% of a pigment. ### Claim 11 (depends on 1) The composition of claim 1, comprising from about 15% by weight to about 25% by weight of one or a combination of a first material selected from the group comprising halogenated butyl rubber and ethylene propylene rubber and from about 10% by weight to about 50% by weight of one or a combination of a second material selected from the group comprising ethylene-propylene-diene copolymer (EPDM), polyurethane, ethylene-vinyl acetate copolymer, polypropylene and cork. ### Claim 12 (depends on 11) The grip according to claim 11, wherein the first material comprises a peroxide curing system. ### Claim 13 (depends on 11) The grip according to claim 11, wherein the first material comprises a sulfur curing system.