# US 2023/0272201 A1 · Hydrosilylation cure of elastomers > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2023/0272201 A1 - Document ID: US20230272201A1 - Status: Published application - Kind: A1 - Application number: 18/017,664 - Filed: 2020-07-22 - Published: 2023-08-31 - Earliest claimed: 2020-07-22 - Assignees: Dow Global Technologies LLC - Applicants: Dow Global Technologies LLC - Inventors: Kainan Zhang; Hongyu Chen; Tao Han; Xiaomei Song; Jie Ji; Linfei Wang; Chao He; Xin Tan - Web page: https://patentgrep.com/patent/US20230272201A1 ## CPC - C08L 23/16: Ethylene-propylene or ethylene-propylene-diene copolymers - C08K 3/36: Silica - C08K 9/06: with silicon-containing compounds - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A process to form a crosslinked composition, said process comprising thermally treating a composition comprising the following: a) an elastomer; b) a siloxy-modified silica; c) a hydrosilylation catalyst. A composition comprising the following: a) an elastomer; b) a siloxy-modified silica; c) a hydrosilylation catalyst. ## Claims ### Claim 1 A process of to form a crosslinked composition, said process of comprising thermally treating a composition comprising the following: a) an elastomer; b) a siloxy-modified silica; c) a hydrosilylation catalyst. ### Claim 2 (depends on 1) The process of claim 1, wherein the elastomer is selected from the following: i) an ethylene/alpha-olefin/nonconjugated polyene interpolymer; ii) a polyisoprene, iii) a polybutadiene, iv) a styrene butadiene rubber, v) a nitrile rubber, vi) a polychloroprene, vii) a butyl rubber, viii) a halogenated butyl rubber, or ix) a halogenated nitrile rubber. ### Claim 3 (depends on 1, 2) The process of claim 1 or claim 2, wherein component b has a viscosity ≤500 cSt at 25° C. ### Claim 4 (depends on 1, 2, 3) The process of any one of claims 1-3, wherein the siloxy portion of the siloxy-modified silica (component b) comprises ≥4 units of the following Structure 1: O—Si(R1)(R2)H (Structure 1), where R1 is a hydrocarbyl group, and R2 is a hydrocarbyl group, and R1 and R2 may be the same or different. ### Claim 5 (depends on 1, 2, 3, 4) The process of any one of claims 1-4, wherein component b has a viscosity, at 25° C., from 0.5 cSt to 200 cSt. ### Claim 6 (depends on 1, 2, 3, 4, 5) The process of any one of claims 1-5, wherein the silica portion of the siloxy-modified silica (component b) is derived from a silica Q resin. ### Claim 7 (depends on 1, 2, 3, 4, 5, 6) The process of any one of claims 1-6, wherein the hydrosilylation catalyst comprises Pt, Pd, Rh, Re, Ir, Ru, or a mixture thereof. ### Claim 8 (depends on 1, 2, 3, 4, 5, 6, 7) The process of any one of claims 1-7, wherein the composition further comprises a polybutadiene. ### Claim 9 (depends on 8) The process of claim 8, wherein the polybutadiene comprises ≤50 mol % of 1,2-vinyl content, based on the total moles of carbon-carbon double bond groups in the polybutadiene. ### Claim 10 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9) The process of any one of claims 1-9, wherein the elastomer of component a is an ethylene/alpha-olefin/nonconjugated polyene interpolymer. ### Claim 11 (depends on 10) The process of claim 10, wherein the nonconjugated polyene of the interpolymer is ENB. ### Claim 12 (depends on 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11) The process of any one of claims 1-11, wherein the composition is thermally treated at a temperature from 90° C. to 220° C. ### Claim 13 A composition comprising the following: a) an elastomer; b) a siloxy-modified silica; c) a hydrosilylation catalyst. ### Claim 14 (depends on 13) The composition of claim 13, wherein the elastomer is selected from the following: i) an ethylene/alpha-olefin/nonconjugated polyene interpolymer; ii) a polyisoprene, iii) a polybutadiene, iv) a styrene butadiene rubber, v) a nitrile rubber, vi) a polychloroprene, vii) a butyl rubber, viii) a halogenated butyl rubber, or ix) a halogenated nitrile rubber. ### Claim 15 (depends on 13, 14) The composition of claim 13 or claim 14, wherein component b has a viscosity ≤500 cSt at 25° C. ### Claim 16 (depends on 13, 14, 15) The composition of anyone of claims 13-15, wherein the siloxy portion of the siloxy-modified silica (component b) comprises ≥4 units of the following Structure 1: O—Si(R1)(R2)H (Structure 1), where R1 is a hydrocarbyl group, and R2 is a hydrocarbyl group, and R1 and R2 may be the same or different. ### Claim 17 (depends on 13, 14, 15, 16) The composition of anyone of claims 13-16, wherein component b has a viscosity, at 25° C., from 0.5 cSt to 200 cSt. ### Claim 18 (depends on 13, 14, 15, 16, 17) The composition of any one of claims 13-17, wherein the silica portion of the siloxy-modified silica (component b) is derived from a silica Q resin. ### Claim 19 (depends on 13, 14, 15, 16, 17, 18) The composition of any one of claims 13-18, wherein the hydrosilylation catalyst comprises Pt, Pd, Rh, Re, Ir, Ru, or a mixture thereof. ### Claim 20 (depends on 13, 14, 15, 16, 17, 18, 19) The composition any one of claims 13-19, wherein the composition further comprises a polybutadiene. ### Claim 21 (depends on 20) The composition of claim 20, wherein the polybutadiene comprises ≤50 mol % of 1,2-vinyl content, based on the total moles of carbon-carbon double bond groups in the polybutadiene. ### Claim 22 (depends on 13, 14, 15, 16, 17, 18, 19, 20, 21) The composition of any one of claims 13-21, wherein the elastomer of component a is an ethylene/alpha-olefin/nonconjugated polyene interpolymer. ### Claim 23 (depends on 22) The composition of claim 22, wherein the nonconjugated polyene of the interpolymer is ENB. ### Claim 24 (depends on 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23) A crosslinked composition formed from the composition of any one of claims 13-23. ### Claim 25 (depends on 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24) An article comprising at least one component formed from the composition of any one of claims 13-24.