# US 12,181,811 B2 · Intermediate transfer member and method of production thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,181,811 B2 - Document ID: US12181811B2 - Status: Granted - Kind: B2 - Application number: 17/635,802 - Filed: 2020-04-01 - Published: 2022-12-08 - Granted: 2024-12-31 - Earliest claimed: 2020-04-01 - Assignees: Hewlett-Packard Development Company, L.P. - Applicants: Hewlett-Packard Development Company, L.P. - Inventors: Dima Libster; Jacob Ben-Yakar; Danny Feldman; Sergey Inotaev; Gabi Habibi; Dafna Shunary - Web page: https://patentgrep.com/patent/US12181811B2 ## CPC - G03G 15/162: {details of the the intermediate support, e.g. chemical composition} - C08G 77/18: to alkoxy or aryloxy groups - C09D 183/04: Polysiloxanes - G03G 15/10: using a liquid developer - C08G 77/12: containing silicon bound to hydrogen - C08G 77/20: containing silicon bound to unsaturated aliphatic groups - C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY - 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) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) ## Abstract There is described an intermediate transfer member for digital offset printing, comprising: a cured silicone release layer formed by curing a curable silicone release formulation comprising: a polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less; a polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol; a polyalkylsiloxane cross-linker containing at least two Si—H bonds; and a catalyst or a photoinitiator. There is also described a method of producing an intermediate transfer member, and a curable silicone release formulation for an intermediate transfer member. ## Claims ### Claim 1 An intermediate transfer member for digital offset printing, comprising: a cured silicone release layer formed by curing a curable silicone release formulation comprising: a polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less; a polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol; a polyalkylsiloxane cross-linker containing at least two Si—H bonds; and a catalyst or a photoinitiator. ### Claim 2 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol has a weight average molecular weight of from 65,000 to about 170,000 g/mol. ### Claim 3 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol has a weight average molecular weight of from 70,000 to about 155,000 g/mol. ### Claim 4 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol comprises a vinyl-terminated polyalkylsiloxane having the following formula: wherein each R1 is independently selected from C1 to C6 alkyl; and r is an integer that provides the vinyl-terminated polyalkylsiloxane with a weight average molecular weight of at least 65,000 g/mol. ### Claim 5 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane comprising two vinyl groups having a weight average molecular weight of at least 65,000 g/mol is present in an amount of up to about 10 mol % based on the total number of moles of vinyl-containing polyalkylsiloxane compounds. ### Claim 6 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane comprising two vinyl groups having a weight average molecular weight of at least 65,000 g/mol is present in an amount of from about 0.5 mol % to about 10 mol % based on the total number of moles of vinyl-containing polyalkylsiloxane compounds. ### Claim 7 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less comprises a polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of 30,000 g/mol or less. ### Claim 8 (depends on 7) The intermediate transfer member according to claim 7, wherein the polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of 30,000 g/mol or less comprises a vinyl-terminated polyalkylsiloxane having the following formula: wherein each R is independently selected from C1 to C6 alkyl; and n is an integer that provides the vinyl-terminated polyalkylsiloxane with a weight average molecular weight of 30,000 g/mol or less. ### Claim 9 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less comprises a polyalkylsiloxane containing at least three vinyl groups having a weight average molecular weight of from about 35,000 g/mol to about 55,000 g/mol. ### Claim 10 (depends on 9) The intermediate transfer member according to claim 9, wherein the polyalkylsiloxane containing at least three vinyl groups comprises a pendent vinyl polyalkylsiloxane having the following formula: wherein each R′ is independently selected from C1 to C6 alkyl; m is 1 or more; and o is 0 or more; and (m+o) is an integer that provides the pendent vinyl polyalkylsiloxane with a weight average molecular weight in the range of 35,000 g/mol to 55,000 g/mol. ### Claim 11 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less comprises a vinyl-terminated polyalkylsiloxane with a weight average molecular weight of 30,000 g/mol or less; and a pendent vinyl polyalkylsiloxane with a weight average molecular weight of from about 35,000 g/mol to about 55,000 g/mol, wherein the vinyl-terminated polyalkylsiloxane with a weight average molecular weight of 30,000 g/mol or less has the following formula: wherein each R is independently selected from C1 to C6 alkyl; and n is an integer that provides the vinyl-terminated polyalkylsiloxane with a weight average molecular weight of 30,000 g/mol or less; and wherein the pendent vinyl polyalkylsiloxane with a weight average molecular weight of from about 35,000 g/mol to about 55,000 g/mol has the following formula: wherein each R′ is independently selected from C1 to C6 alkyl; m is 1 or more; and o is 0 or more; and (m+o) is an integer that provides the pendent vinyl polyalkylsiloxane with a weight average molecular weight of from 35,000 g/mol to about 55,000 g/mol. ### Claim 12 (depends on 11) The intermediate transfer member according to claim 11, wherein the polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol comprises a vinyl-terminated polyalkylsiloxane having the following formula: wherein each R1 is independently selected from C1 to C6 alkyl; and r is an integer that provides the vinyl-terminated polyalkylsiloxane with a weight average molecular weight of at least 65,000 g/mol. ### Claim 13 (depends on 1) The intermediate transfer member according to claim 1, wherein the polyalkylsiloxane cross-linker containing at least two Si—H bonds comprises a polyalkylsiloxane cross-linker having the following formula: wherein each R″ is independently selected from C1 to C6 alkyl; each R′″ is independently selected from H and C1 to C6 alkyl; p is 2 or more; and q is 0 or more. ### Claim 14 A method of producing an intermediate transfer member for digital offset printing, comprising: applying onto an intermediate transfer member body a curable silicone release formulation; curing the curable silicone release formulation to form a cured silicone release layer; wherein the curable silicone release formulation comprises: a polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less; a polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol; a polyalkylsiloxane cross-linker containing at least two Si—H bonds; and a catalyst or a photoinitiator. ### Claim 15 A curable release formulation for an intermediate transfer member of a digital offset printing apparatus, comprising: a polyalkylsiloxane containing at least two vinyl groups having a weight average molecular weight of 60,000 g/mol or less; a polyalkylsiloxane containing two vinyl groups having a weight average molecular weight of at least 65,000 g/mol; a polyalkylsiloxane cross-linker containing at least two Si—H bonds; and a catalyst or a photoinitiator.