# US 2021/0277972 A1 · Friction material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0277972 A1 - Document ID: US20210277972A1 - Status: Published application - Kind: A1 - Application number: 17/126,773 - Filed: 2020-12-18 - Published: 2021-09-09 - Earliest claimed: 2020-03-04 - Assignees: BorgWarner Inc. - Applicants: BorgWarner Inc. - Inventors: Richard W. Pridgen, Jr.; Benjamin A. Siegel; Steven J. Kowal; David T. Vierk - Web page: https://patentgrep.com/patent/US20210277972A1 ## CPC - F16D 69/026: {containing fibres} - F16D 13/64: Clutch-plates; Clutch-lamellae (brake-plates, brake-lamellae F16D65/12) - F16D 69/04: Attachment of linings - F16D 2069/008: {Layers of fibrous materials} - F16D 2069/0466: {chemical, e.g. using adhesives, vulcanising} - F16D 2200/0034: non-metallic - F16D 2200/006: containing fibres or particles - F16D 2200/0069: being characterised by their size - F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES ## Abstract A friction material includes a friction-generating layer and a base layer. The base layer includes base fibers and presents a bonding surface. The friction-generating layer includes friction-adjusting particles deposited on the base layer and presents a friction-generating surface facing opposite the bonding surface of the base layer. A curable resin is present in the friction-generating layer and the base layer. The friction material also includes a composition including a plurality of triglycerides. The composition is present in at least one of the friction-generating layer and the base layer. The plurality of triglycerides comprises polyunsaturated fatty acid in a content of from 60 to 90% by weight based on a total weight of the plurality of triglycerides included in the composition. ## Claims ### Claim 1 A friction material comprising: (A) a base layer comprising base fibers and presenting a bonding surface; (B) a friction-generating layer comprising friction-adjusting particles deposited on said base layer and presenting a friction-generating surface facing opposite said bonding surface of said base layer; (C) a curable resin present in said friction-generating layer and said base layer; and (D) a composition comprising a plurality of triglycerides, said plurality of triglycerides comprising polyunsaturated fatty acid in a content of from 60 to 90% by weight based on a total weight of said plurality of triglycerides included in said composition; wherein said composition is present in at least one of said friction-generating layer and said base layer. ### Claim 2 (depends on 1) The friction material as set forth in claim 1 wherein said plurality of triglycerides comprises at least one fatty acid selected from palmitic acid, stearic acid, arachidic acid, palmitoleic acid, oleic acid, eicosenoic acid, linoleic acid, and α-linolenic acid. ### Claim 3 (depends on 1) The friction material as set forth in claim 1 wherein said plurality of triglycerides comprises α-linolenic. acid in an amount of greater than 40% by weight based on a total weight of said plurality of triglycerides included in said composition. ### Claim 4 (depends on 1) The friction material as set forth in claim 1 wherein said plurality of triglycerides comprises linoleic acid in an amount of greater than 12% by weight based on a total weight of said plurality of triglycerides included in said composition ### Claim 5 (depends on 1) The friction material as set forth in claim 1 wherein said plurality of triglycerides comprises oleic acid in an amount of greater than 10% by weight based on a total weight of said plurality of triglycerides included in said composition. ### Claim 6 (depends on 1) The friction material as set forth in claim 1 wherein said composition is a natural oil selected from linseed oil, grapeseed oil, sunflower, and hemp seed oil. ### Claim 7 (depends on 1) The friction material as set forth in claim 1 wherein said friction-adjusting particles are selected from carbon particles, diatomaceous earth particles, cashew nut particles, and combinations thereof. ### Claim 8 (depends on 1) The friction material as set forth in claim 1 wherein said friction-adjusting particles have an average diameter of from 100 nm to 80 μm. ### Claim 9 (depends on 1) The friction material as set forth in claim 1 wherein said friction-generating layer further comprises cellulose fibers. ### Claim 10 (depends on 1) The friction material as set forth in claim 1 wherein said base fibers comprise aramid fibers and cellulose fibers. ### Claim 11 (depends on 1) The friction material as set forth in claim 1 wherein said base layer further comprises cashew nut particles, carbon particles, and/or diatomaceous earth particles. ### Claim 12 (depends on 1) The friction material as set forth in claim 1 wherein said friction-generating layer has a lower porosity than said base layer as determined using ASTM test method D4404-10. ### Claim 13 (depends on 1) The friction material as set forth in claim 1 wherein said friction-generating layer has a thickness of from 10 to 600 μm and said base layer has a thickness from 0.2 mm to 3.75 mm. ### Claim 14 (depends on 1) The friction material as set forth in claim 1 wherein said composition is present in said friction-generating layer and said base layer. ### Claim 15 (depends on 1) The friction material as set forth in claim 1 wherein said composition is present in an amount of from 1 to 45% by weight based on a total weight of all non-resin and non-composition components in said friction material, and wherein said resin is present in an amount of from 20 to 90% by weight based on a total weight of all non-resin and non-composition components in said friction material. ### Claim 16 (depends on 1) The friction material as set forth in claim 1 wherein said resin and said composition are respectively present in a weight ratio of from 20:1 to 2:1. ### Claim 17 (depends on 1) The friction material as set forth in claim 1 wherein; said plurality of triglycerides comprises at least one fatty acid selected from palmitic acid, stearic acid, arachidic acid, palmitoleic acid, oleic acid, eicosenoic acid, linoleic acid, and α-linolenic acid; and said composition is a natural oil selected from linseed oil, grapeseed oil, sunflower, and hemp seed oil; and said friction-adjusting particles have an average diameter of from 100 nm to 80 μm and are selected from carbon particles, diatomaceous earth particles, cashew nut particles, and combinations thereof. ### Claim 18 (depends on 1) A friction plate comprising a substrate and said friction material as set forth in claim 1, which is cured and bonded to said substrate. ### Claim 19 (depends on 18) A wet clutch assembly comprising said friction plate of claim 18 and a separator plate. ### Claim 20 (depends on 19) A transmission comprising said wet clutch assembly of claim 19.