# US 10,308,840 B2 · Transparent adhesive with a refractive index ranging from 1.7 to 1.73 > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,308,840 B2 - Document ID: US10308840B2 - Status: Granted - Kind: B2 - Application number: 14/906,790 - Filed: 2014-07-22 - Published: 2016-06-09 - Granted: 2019-06-04 - Earliest claimed: 2013-07-22 - Assignees: CeramTec-ETEC GmbH - Applicants: CeramTec-ETEC GmbH - Inventors: Elisabeth Klemm; Martin Tittel - Web page: https://patentgrep.com/patent/US10308840B2 ## CPC - C09J 4/00: Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16} - C08F 220/38: Esters containing sulfur - C09J 9/00: Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks (C09J7/00 takes precedence) - C09J 11/04: inorganic - C08F 222/102: {of dialcohols, e.g. ethylene glycol di(meth)acrylate or 1,4-butanediol dimethacrylate} - C08K 3/22: of metals - C08K 2003/2296: {of zinc} - C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A transparent adhesive having a refractive index ranging from 1.7 to 1.73 and to the production and the use thereof, particularly the use thereof for coatings and adhesive bonds. ## Claims ### Claim 1 An adhesive having a refractive index ranging from 1.7 to 1.73 based on thioacrylate of formula 1 and a polymerization initiator, wherein the adhesive is transparent. ### Claim 2 (depends on 1) The adhesive according to claim 1, wherein the adhesive further comprises a commoner, wherein the comonomer is pentabromophenyl methacrylate of formula 2 ### Claim 3 (depends on 1) The adhesive according to claim 1, further comprising a cross-linking agent, wherein the crosslinking agent is a bisacrylate of formula 3 ### Claim 4 (depends on 1) The adhesive according to claim 1, wherein the adhesive contains the polymerization initiator as a photoinitiator and is present in an amount of 2.0 to 5.0 wt %. ### Claim 5 (depends on 4) The adhesive according to claim 4, wherein the photoinitiator is selected from the group consisting of a hydroxy ketone, a monoacylphosphine, a bisacylphosphine and a benzoyl derivative. ### Claim 6 (depends on 4) The adhesive according to claim 4, wherein the photoinitiator is selected from the group consisting of 1-hydroxycyclohexyl phenyl ketone, 2,4,6-trimethylbenzoyl bisphenyl phosphine oxide, bis(2,4,6-trimethylbenzoyl)phosphine oxide and 2-hydroxy-2-methyl-1-phenyl-propanone. ### Claim 7 (depends on 1) The adhesive according to claim 1, further comprising inorganic nanoparticles, wherein the inorganic nanoparticles comprise a metal oxide. ### Claim 8 (depends on 7) The adhesive according to claim 7, wherein the metal oxide is selected from the group consisting of an aluminum oxide, a zinc oxide and a titanium oxide. ### Claim 9 (depends on 8) The adhesive according to claim 8, wherein the metal oxide is zinc oxide. ### Claim 10 (depends on 1) A method for producing the adhesive according to claim 1, comprising the steps of: mixing the thioacrylate of formula 1 with the polymerization initiator to form a mixture; and curing the mixture. ### Claim 11 (depends on 10) The method according to claim 10, wherein inorganic nanoparticles are added to the mixture, wherein the inorganic nanoparticles comprise a metal oxide. ### Claim 12 (depends on 11) The method according to claim 11, wherein the inorganic nanoparticles are added as a dispersion in at least one member selected from the group consisting of ethanol and isopropanol. ### Claim 13 (depends on 1) A coated substrate comprising a substrate and a coating comprising the adhesive of claim 1. ### Claim 14 (depends on 1) An article of manufacture comprising the adhesive of claim 1 joining two surfaces. ### Claim 15 An article of manufacture comprising an adhesive, wherein the adhesive has a refractive index ranging from 1.7 to 1.73 based on thioacrylate of formula 1 and a polymerization initiator, wherein the adhesive is transparent, wherein the article of manufacture is a transparent ballistics protective system, a blasting-wear-resistant viewing windows for a blasting cabinet, a window for a machining installation that is scratch-resistant, a transparent architectural element, a transparent jewelry part, a chemical window having resistance to acids and lyes or a window for a measurement sensor. ### Claim 16 (depends on 1) An article of manufacture comprising the adhesive of claim 1, wherein the article of manufacture is a transparent ballistics protective system, a blasting-wear-resistant viewing windows for a blasting cabinet, a window for a machining installation that is scratch-resistant, a transparent architectural element, a transparent jewelry part, or a window for a measurement sensor. ### Claim 17 An article of manufacture comprising an adhesive, wherein the adhesive has a refractive index from 1.7 to 1.73 based on thioacrylate of formula 1 and a polymerization initiator, wherein the adhesive is transparent, wherein the article of manufacture is a transparent ballistics protective system, a blasting-wear-resistant viewing windows for a blasting cabinet, a window for a machining installation that is scratch-resistant, a transparent architectural element, a transparent jewelry part, or a window for a measurement sensor. ### Claim 18 An adhesive having a refractive index of 1.7 based on thioacrylate of formula 1 and a polymerization initiator, wherein the adhesive is transparent.