# US 11,441,034 B2 · Polysiloxane composition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,441,034 B2 - Document ID: US11441034B2 - Status: Granted - Kind: B2 - Application number: 17/048,738 - Filed: 2018-04-19 - Published: 2021-08-05 - Granted: 2022-09-13 - Earliest claimed: 2018-04-19 - Assignees: Wacker Chemie AG - Applicants: Wacker Chemie AG - Inventors: Jian Nie; Minlong Xi - Web page: https://patentgrep.com/patent/US11441034B2 ## CPC - C08L 83/04: Polysiloxanes - C08G 77/16: to hydroxy groups - C08K 3/013: Fillers, pigments or reinforcing additives - C08K 5/0016: {Plasticisers} - C08K 5/5419: containing at least one Si—C bond - C08K 5/5425: containing at least one C=C bond - C08K 5/544: containing nitrogen - C08K 5/57: Organo-tin compounds - C08G 77/26: nitrogen-containing groups - C08G 2190/00: Compositions for sealing or packing joints - 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 - C08L 2312/08: by silane - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) ## Abstract A polysiloxane composition which is curable by condensation, contains at least one hydroxyl-terminated polyorganosiloxane, at least one diacetoxysilane optionally bearing an alkoxy group, at least one multifunctional alkoxysilane, at least one filler, and at least one catalyst. ## Claims ### Claim 1 A polysiloxane composition comprising: a) at least one hydroxyl-terminated polyorganosiloxane; b) at least one diacetoxysilane, having the formula: where, R1 and R2 are each independently an alkyl group, or an alkoxy group having one or more carbon atoms; c) at least one multifunctional alkoxysilane crosslinker selected from the group consisting of methyltrimethoxysilane, methyltriethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, tetramethoxysilane, tetraethoxyoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, and combinations thereof; d) at least one filler; and e) at least one catalyst. ### Claim 2 (depends on 1) The polysiloxane composition of claim 1, wherein the composition comprises less than 4 parts by weight of multifunctional acetoxysilane, based on 100 parts by weight of ingredient (a). ### Claim 3 (depends on 1) The polysiloxane composition of claim 1, wherein ingredient (a) is present in an amount of from 10 wt % to 85 wt % and ingredient (b) is present in an amount of from 0.03 wt % to 1.9 wt %, based on the total weight of the starting materials of the polysiloxane composition. ### Claim 4 (depends on 1) The polysiloxane composition of claim 1, wherein ingredient (b) is used in an amount of from 0.03 wt % to 1.9 wt % and ingredient (c) from 0.5 wt % to 8 wt %, based on the total weight of the starting materials of the polysiloxane composition. ### Claim 5 (depends on 1) The polysiloxane composition of claim 1, wherein ingredient (a) has a kinematic viscosity at 25° C. ranging from 20,000 to 100,000 mm2/s. ### Claim 6 A polysiloxane composition comprising: a) at least one hydroxyl-terminated polyorganosiloxane; b) at least one diacetoxysilane, having the formula: where, R1 and R2 are each independently an alkyl group, or an alkoxy group having one or more carbon atoms; c) at least one multifunctional alkoxysilane; d) at least one filler; and e) at least one catalyst, wherein in ingredient (b) R1 and R2 are each independently a C1-C16 alkyl group, and the mass ratio of ingredient (a) to ingredient (b) is (75-1400): 1. ### Claim 7 (depends on 1) The polysiloxane composition of claim 1, wherein in ingredient (b) where R1 and R2 are each independently an alkoxy group having 1 to 16 carbon atoms, and the mass ratio of ingredient (a) to ingredient (b) is (20-1400): 1. ### Claim 8 A polysiloxane composition comprising: a) at least one hydroxyl-terminated polyorganosiloxane; b) at least one diacetoxysilane, having the formula: where, R1 and R2 are each independently an alkyl group, or an alkoxy group having one or more carbon atoms; c) at least one multifunctional alkoxysilane; d) at least one filler; and e) at least one catalyst, wherein ingredient (d) is present in an amount of from 20 wt % to 60 wt %, based on the total weight of the starting materials of the polysiloxane composition. ### Claim 9 (depends on 1) The polysiloxane composition of claim 1, comprising a silicone resin (f). ### Claim 10 (depends on 9) The polysiloxane composition of claim 9, wherein silicon resin (f) has a dynamic viscosity at 25° C. ranging from 10,000 to 500,000 mPa·s. ### Claim 11 (depends on 1) The polysiloxane composition of claim 1, wherein the composition comprises less than 20 wt % of plasticizer, based on the total weight of the starting materials of the polysiloxane composition. ### Claim 12 (depends on 1) The polysiloxane composition of claim 1, wherein the catalyst is an organotin or organotitanium compound. ### Claim 13 (depends on 1) An elastomer it is obtained by curing a polysiloxane composition of claim 1. ### Claim 14 (depends on 1) The polysiloxane composition of claim 1, which contains less than 15 weight percent plasticizer based on the total weight of the composition. ### Claim 15 (depends on 1) The polysiloxane composition of claim 1, which contains less than 10 weight percent plasticizer based on the total weight of the composition. ### Claim 16 (depends on 1) The polysiloxane composition of claim 1, which is free of plasticizer. ### Claim 17 (depends on 1) The polysiloxane composition of claim 1, which contains less than 10% by weight of silicone resin based upon the total weight of the composition. ### Claim 18 (depends on 1) The polysiloxane composition of claim 1, which contains less than 5% by weight of silicone resin based on the total weight of the composition. ### Claim 19 (depends on 1) The composition of claim 1, which has a 100% modulus of less than 0.7 MPa. ### Claim 20 (depends on 14) The composition of claim 14, which is a 100% modulus of less than 0.7 MPa.