# US 2013/0157083 A1 · Uv cross-linking neat lubricant mixtures for magnetic recording media > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0157083 A1 - Document ID: US20130157083A1 - Status: Published application - Kind: A1 - Application number: 13/330,339 - Filed: 2011-12-19 - Published: 2013-06-20 - Earliest claimed: 2011-12-19 - Assignees: HGST Netherlands B.V. - Inventors: Xing-Cai Guo; Robert Waltman - Web page: https://patentgrep.com/patent/US20130157083A1 ## CPC - C10M 169/042: {the additives being compounds of unknown or incompletely defined constitution only} - C08F 8/40: Introducing phosphorus atoms or phosphorus-containing groups - C10M 107/38: containing halogen - G11B 5/00: Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor (G11B11/00 {and G11B13/00} take precedence) - G11B 5/7257: {Perfluoropolyether lubricant} - C08J 3/28: Treatment by wave energy or particle radiation - C08J 2300/12: Polymers characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity - C10M 147/00: Lubricating compositions characterised by the additive being a macromolecular compound containing halogen - C10M 147/04: Monomer containing carbon, hydrogen, halogen and oxygen - C10M 2213/04: obtained from monomers containing carbon, hydrogen, halogen and oxygen - C10M 2213/043: used as base material - C10N 2040/18: in connection with recordings on magnetic tape or disc - C10N 2070/00: Specific manufacturing methods for lubricant compositions - C10M: LUBRICATING COMPOSITIONS (well drilling compositions C09K8/02); USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION (mould release, i.e. separating, agents for metals B22C3/00, for plastics or substances in a plastic state, in general B29C33/56, for glass C03B40/02; textile lubricating compositions D06M11/00, D06M13/00, D06M15/00; immersion oils for microscopy G02B21/33) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C10N: INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS ## Abstract A method, system and apparatus are disclosed for forming a lubricant film for magnetic recording applications. The method includes, in certain embodiments, providing at least one substantially solvent free lubricant having a plurality of lubricant molecules with each lubricant molecule comprising a polymer chain having a backbone section and at least one functional end group. The method also includes treating the at least one substantially solvent free lubricant with a physical treatment to cross-link the backbone section of each polymer chain with at least one other molecule to create a cross-linked lubricant. ## Claims ### Claim 1 A method for forming a lubricant film for magnetic recording applications, the method comprising: providing at least one substantially solvent free lubricant, the at least one substantially solvent free lubricant comprising a plurality of lubricant molecules, each lubricant molecule comprising a polymer chain having a backbone section and at least one functional end group; and treating the at least one substantially solvent free lubricant with a physical treatment to cross-link the backbone section of each polymer chain with at least one other molecule to create a cross-linked lubricant. ### Claim 2 (depends on 1) The method of claim 1, wherein the physical treatment comprises a treatment selected from heating the at least one substantially solvent free lubricant, increasing pressure on the at least one substantially solvent free lubricant, changing the pH for the at least one substantially solvent free lubricant, irradiating the at least one substantially solvent free lubricant, and adding a catalyst to the at least one substantially solvent free lubricant. ### Claim 3 (depends on 2) The method of claim 2, wherein irradiating the at least one substantially solvent free lubricant comprises exposing the at least one substantially solvent free lubricant to a radiation source selected from an electron beam, gamma-radiation, and an ultraviolet light source. ### Claim 4 (depends on 1) The method of claim 1, wherein the physical treatment comprises exposing the at least one substantially solvent free lubricant to an ultraviolet light source, wherein the ultraviolet light source has a wavelength selected from 185 nm and 172 nm. ### Claim 5 (depends on 4) The method of claim 4, further comprising adjusting a distance between the ultraviolet light source and the at least one substantially solvent free lubricant to optimize cross-linking between the backbone section of each polymer chain and the at least one other molecule. ### Claim 6 (depends on 1) The method of claim 1, further comprising controlling an extent of cross-linking between the backbone section of each polymer chain and the at least one other molecule by monitoring an increase in viscosity of the at least one substantially solvent free lubricant. ### Claim 7 (depends on 6) The method of claim 6, wherein the at least one substantially solvent free lubricant is treated with the physical treatment to increase the viscosity of the at least one substantially solvent free lubricant by at least about thirty-five percent. ### Claim 8 (depends on 1) The method of claim 1, wherein the at least one substantially solvent free lubricant and the at least one other molecule each have a chemical structure that is substantially similar. ### Claim 9 (depends on 1) The method of claim 1, wherein the at least one other molecule comprises a lubricant additive having an enhanced lubricating characteristic with respect to the at least one substantially solvent free lubricant, the enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 10 (depends on 1) The method of claim 1, wherein the at least one substantially solvent free lubricant comprises an lubricant having an enhanced lubricating characteristic with respect to the at least one other molecule, the enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 11 (depends on 1) The method of claim 1, wherein the at least one solvent free lubricant comprises a lubricant selected from Z-DOL, Z-TETRAOL, ZTMD, and Demnum. ### Claim 12 (depends on 1) The method of claim 1, wherein the at least one other molecule comprises a lubricant additive selected from X-1P and A20H. ### Claim 13 (depends on 1) The method of claim 1, further comprising dissolving the cross-linked lubricant in a solvent and applying the cross-linked lubricant and the solvent to a surface of a magnetic recording medium. ### Claim 14 (depends on 13) The method of claim 13, further comprising evaporating the solvent from the cross-linked lubricant leaving the cross-linked lubricant on the surface of the magnetic recording medium. ### Claim 15 A lubricant for lubricating a surface of a magnetic recording medium, the lubricant comprising: a substantially solvent free lubricant comprising a plurality of lubricant molecules, each lubricant molecule comprising a polymer chain having a backbone section and at least one functional end group; and wherein the lubricant molecule is exposed to ultraviolet radiation to cross-link one of the backbone section of the polymer chain and the at least one functional end group with at least one other molecule. ### Claim 16 (depends on 15) The lubricated of claim 15, wherein the substantially solvent free lubricant comprises a lubricant selected from Z-DOL, Z-TETRAOL, ZTMD and Demnum. ### Claim 17 (depends on 15) The lubricant of claim 15, wherein the at least one other molecule comprises a second lubricant molecule from the plurality of lubricant molecules of the substantially solvent free lubricant, wherein the backbone section of the lubricant molecule and the backbone section of the second lubricant molecule are cross-linked. ### Claim 18 (depends on 15) The lubricant of claim 15, wherein the at least one other molecule comprises a lubricant additive, wherein the lubricant has at least one enhanced lubricating characteristic with respect to the lubricant additive, the at least one enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 19 (depends on 15) The lubricant of claim 15, wherein the at least one other molecule comprises a lubricant additive having at least on enhanced lubricating characteristic with respect to the substantially solvent free lubricant, the at least one enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 20 (depends on 15) The lubricant of claim 15, wherein the at least one other molecule comprises a lubricant additive selected from X-1P and A20H. ### Claim 21 A lubricated recording medium for magnetic recording applications, the lubricated recording medium comprising: a substrate comprising a rigid support structure for depositing a plurality of layers thereon; an overcoat layer comprising a protective coating; a magnetic recording layer disposed between the substrate and the overcoat layer; and a lubricating layer disposed on the overcoat layer opposite the substrate, the lubricating layer comprising a lubricant compound developed from at least one substantially solvent free lubricant, the at least one substantially solvent free lubricant comprising a plurality of lubricant molecules, each lubricant molecule comprising a polymer chain having a backbone section and at least one functional end group, wherein the at least one substantially solvent free lubricant is exposed to ultraviolet radiation to cross-link the backbone section of each polymer chain with at least one other molecule to create a cross-linked lubricant. ### Claim 22 (depends on 21) The lubricated recording medium of claim 21, wherein the substantially solvent free lubricant comprises a lubricant selected from Z-DOL, Z-TETRAOL, ZTMD, and Demnum. ### Claim 23 (depends on 21) The lubricated recording medium of claim 21, wherein the at least one other molecule comprises a second lubricant molecule from the plurality of lubricant molecules of at least one substantially solvent free lubricant, wherein the backbone section of the lubricant molecule and the backbone section of the second lubricant molecule are cross-linked. ### Claim 24 (depends on 21) The lubricated recording medium of claim 21, wherein the at least one other molecule comprises a lubricant additive, wherein the substantially solvent free lubricant has at least one enhanced lubricating characteristic with respect to the lubricant additive, the at least one enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 25 (depends on 21) The lubricated recording medium of claim 21, wherein the at least one other molecule comprises a lubricant additive having at least on enhanced lubricating characteristic with respect to the substantially solvent free lubricant, the at least one enhanced lubricating characteristic comprising a characteristic selected from an enhanced surface bonding characteristic and an enhanced tribological characteristic. ### Claim 26 (depends on 21) The lubricated recording medium of claim 21, wherein the at least one other molecule comprises a lubricant additive selected from X-1P and A20H.