# US 2017/0283535 A1 · Acrylic syrup preparation method and acrylic syrup > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2017/0283535 A1 - Document ID: US20170283535A1 - Status: Published application - Kind: A1 - Application number: 15/509,693 - Filed: 2015-09-23 - Published: 2017-10-05 - Earliest claimed: 2014-09-29 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Jun-Man Choi; Jang-Soon Kim - Web page: https://patentgrep.com/patent/US20170283535A1 ## CPC - C08F 2/02: Polymerisation in bulk - C08F 2/48: by ultraviolet or visible light - C08F 2/50: with sensitising agents - C08F 20/18: with acrylic or methacrylic acids - C08F 220/1808: {C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate} - C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} - C08F 220/1806: {C6-(meth)acrylate, e.g. (cyclo)hexyl (meth)acrylate or phenyl (meth)acrylate} - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) ## Abstract Provided is an acrylic syrup preparation method including the steps of: performing bulk photopolymerization by initiating a UV irradiation of a composition containing a photoinitiator and one or more types of acrylic monomers; stopping the UV irradiation at the time point when the temperature is increased by about 5° C. to about 40° C. from the time point when the temperature at which the UV irradiation of the composition is initiated; and purging the composition with an oxygen-containing inert gas after the UV irradiation is stopped. ## Claims ### Claim 1 An acrylic syrup preparation method, comprising the steps of: performing bulk photopolymerization by initiating a UV irradiation of a composition containing a photoinitiator and one or more types of acrylic monomers; stopping the UV irradiation at the time point when the temperature is increased by about 5° C. to about 40° C. from the time point when the temperature at which the UV irradiation of the composition is initiated; and purging the composition with an oxygen-containing inert gas after the UV irradiation is stopped. ### Claim 2 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the oxygen-containing inert gas contains oxygen in an amount of about 10 vol % to about 30 vol %. ### Claim 3 (depends on 1) The acrylic syrup preparation method of claim 1, wherein stirring is carried out at least while the composition is purged with the oxygen-containing inert gas. ### Claim 4 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the composition is purged with the oxygen-containing inert gas until the time point when the temperature of the composition reaches at least about 20° C. to about 50° C. ### Claim 5 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the composition does not comprise a molecular weight adjusting agent. ### Claim 6 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the acrylic monomers is polymerized at a conversion rate of about 4% to about 20% until the time point when the UV irradiation is stopped. ### Claim 7 (depends on 1) The acrylic syrup preparation method of claim 1, wherein an acrylic polymer having a weight average molecular weight of about 1,000,000 g/mol to about 20,000,000 g/mol is formed by the bulk photopolymerization until the time point when the UV irradiation is stopped. ### Claim 8 (depends on 1) The acrylic syrup preparation method of claim 1, wherein a nitrogen purging of the composition is started and carried out from before the UV irradiation is initiated. ### Claim 9 (depends on 8) The acrylic syrup preparation method of claim 8, wherein stirring is carried out at least while the composition is purged with nitrogen. ### Claim 10 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the temperature of the composition is set to about −10° C. to about 80° C. when the time point when the UV irradiation is initiated. ### Claim 11 (depends on 1) The acrylic syrup preparation method of claim 1, further comprising: the step of preparing the composition by mixing the photoinitiator in an amount of about 0.001 part by weight to about 1 part by weight based on about 100 parts by weight of the one or more types of acrylic monomers. ### Claim 12 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the one or more types of acrylic monomers comprise at least one selected from the group consisting of a (meth)acrylic acid ester-based monomer which comprises an alkyl group having 1 to 15 carbon atoms; a (meth)acrylic acid ester-based monomer which comprises a hydroxy group, a carboxyl group, and an amine group; and a combination thereof. ### Claim 13 (depends on 1) The acrylic syrup preparation method of claim 1, wherein the photoinitiator absorbs light with a wavelength of about 100 nm to about 400 nm. ### Claim 14 (depends on 1) An acrylic syrup which does not comprises a molecular weight adjusting agent, and is prepared by means of bulk photopolymerization by the acrylic syrup preparation method according to claim 1. ### Claim 15 (depends on 14) The acrylic syrup of claim 14, wherein the acrylic syrup comprises an acrylic polymer having a weight average molecular weight of 1,000,000 g/mol to 20,000,000 g/mol. ### Claim 16 (depends on 14) The acrylic syrup of claim 14, wherein the acrylic polymer has a polydispersity index of 1.98 to 10. ### Claim 17 (depends on 14) The acrylic syrup of claim 14, wherein the acrylic syrup has a conversion rate of 4% to 20%. ### Claim 18 (depends on 14) The acrylic syrup of claim 14, wherein the acrylic syrup has a viscosity of 1,000 cps to 100,000 cps at 20° C.