# US 10,370,557 B2 · D1563 radiation curable secondary coating for optical fibers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,370,557 B2 - Document ID: US10370557B2 - Status: Granted - Kind: B2 - Application number: 15/527,746 - Filed: 2015-11-18 - Published: 2017-12-14 - Granted: 2019-08-06 - Earliest claimed: 2014-11-19 - Assignees: Dsm IP Assets B.V. - Applicants: DSM IP Assets B.V. - Inventors: Hirofumi Uchida; Zen Komiya - Web page: https://patentgrep.com/patent/US10370557B2 ## CPC - C08F 290/067: {Polyurethanes; Polyureas} - C08G 18/246: {containing also tin-carbon bonds} - C08G 18/4825: {Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence)} - C08G 18/672: {Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen} - C09D 133/066: {containing -OH groups} - C09D 135/02: Homopolymers or copolymers of esters (C09D135/06, C09D135/08 take precedence) - C09D 151/08: grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds - C09D 175/16: having terminal carbon-to-carbon unsaturated bonds - G02B 6/00: Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings - G02B 6/02395: {Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104)} - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON 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) - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A radiation curable secondary coating composition for optical fiber is described and claimed. This radiation curable secondary coating composition includes component (A) which is a urethane (meth)acrylate and component (B) which is a (meth)acrylate compound with two or more ethylenically unsaturated groups and one or more bisphenol structures; wherein the content of component (B) in the composition is 60-300 mass parts per 100 mass parts of component (A). The liquid secondary coating has a viscosity at 25° C. of from about 0.1 Pa·s to about 15 Pa·s. Films obtained by curing the liquid radiation curable secondary coating composition of the present invention have a Young's modulus of from about 600 MPa to about 500 MPa and the breaking elongation of the cured film is from about to 5% to about 50%. ## Claims ### Claim 1 A radiation curable secondary ting composition for optical fiber which comprises: (A) at least two different urethane (meth)acrylate oligomers; (B) a (meth)acrylate compound with two or more ethylenically unsaturated groups and one or more bisphenol structures; and (C) a (meth)acrylate compound with one or more ethylenically unsaturated groups, said component (C) being other than components (A) and (B); wherein the content of component (B) in the composition is 100 to 300 mass parts per 100 mass parts of component (A). ### Claim 2 (depends on 1) The radiation curable secondary coating composition claim 1, wherein the content of component (B) in the composition is from greater than 100 mass parts to less than or equal to 250 mass parts per 100 mass parts of component (A). ### Claim 3 (depends on 2) The radiation curable secondary coating composition of claim 2, wherein the content of component (B) in the composition is 50 mass % or more of the total quantity of components (B) and (C). ### Claim 4 (depends on 3) The radiation curable secondary coating composition of claim 3, wherein component (B) is an epoxy di(meth)acrylate comprising a bisphenol structure. ### Claim 5 (depends on 3) The radiation curable secondary coating composition of claim 3, wherein component (B) is a di(meth)acrylate comprising a bisphenol structure, wherein component (B) is other than an epoxy(meth)acrylate. ### Claim 6 (depends on 3) The radiation curable secondary coating composition of claim 3, Wherein component (B) is a compound shown by formula (3) wherein R2 is selected from the group consisting of hydrogen atoms, fluorine atoms, and methyl groups; R3 are, independently of each other, selected from the group consisting of alkylene groups with 1-4-carbon atoms; R4 are, independently of each other, selected from the group consisting of hydrogen atoms and methyl groups; m1 and m2 are, independently of each other, 0-10; n1 and n2 are, independently of each other, 0 or 1; m1+n1 is equal to or greater than 1; and m2+n2 is equal to or greater than 1. ### Claim 7 (depends on 6) The radiation curable secondary coating composition of claim 6, wherein both n1 and n2 are 1. ### Claim 8 (depends on 6) The radiation curable secondary coating composition of claim 6, wherein both n1 and n2 are 0. ### Claim 9 (depends on 3) The radiation curable secondary coating composition of claim 3, wherein the one or more bisphenol structures in component (B) comprises a bisphenol A structure. ### Claim 10 (depends on 9) The radiation curable secondary coating composition of claim 9, wherein component (B) is included in the composition in an amount of about 20 mass % to about 80 mass %, relative to all of the components of the radiation curable secondary coating composition. ### Claim 11 (depends on 9) The radiation curable secondary coating composition of claim 9, wherein component (B) is included in the composition in an amount of about 25 mass % to about 60 mass %, relative to all of the components of the radiation curable secondary coating composition. ### Claim 12 (depends on 9) The radiation curable secondary coating composition of claim 9, wherein component (B) is included in the composition in an amount of about 27 mass % to about 50 mass %, relative to all of the components of the radiation curable secondary coating composition. ### Claim 13 (depends on 1) The radiation curable secondary coating composition of claim 1, wherein the radiation curable secondary coating composition has a viscosity at 25° C. from about 0.1 Pa·s to about 15 Pa·s. ### Claim 14 (depends on 13) A secondary coating layer on optical fiber, obtained by curing the radiation curable secondary coating composition of claim 13. ### Claim 15 (depends on 14) An optical fiber which comprises the secondary coating layer of claim 14. ### Claim 16 (depends on 13) A film obtained by curing the radiation curable secondary coating composition of claim 13, having a Young's moduli of from about 600 MPa to about 1500 MPa. ### Claim 17 (depends on 9) A film obtained by curing the radiation curable secondary coating composition of claim 9, having a breaking elongation from about 15% to about 40%. ### Claim 18 (depends on 1) The radiation curable secondary coating composition of claim 1, wherein at least one urethane (meth)acrylate oligomer is synthesized from a group of reactants comprising a polypropylene glycol with a molecular weight of about 10,000 g/mol. ### Claim 19 (depends on 1) The radiation curable secondary coating composition of claim 1, wherein component (C) comprises tripropylene glycol diacrylate. ### Claim 20 (depends on 12) The radiation curable secondary coating composition of claim 12, further comprising: (D) a polymerization initiator, wherein the polymerization initiator is present in the radiation curable secondary coating composition in a quantity from 0.1 mass % to 7 mass %; and optionally, one or more additives.