# US 5,708,948 A · Fuser belts with improved release and gloss > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,708,948 A - Document ID: US5708948A - Status: Granted - Kind: A - Application number: 08/691,621 - Filed: 1996-08-02 - Granted: 1998-01-13 - Earliest claimed: 1996-08-02 - Assignees: Eastman Kodak Company - Inventors: Jiann-H. Chen; Muhammed Aslam; Lawrence Paul Demejo - Web page: https://patentgrep.com/patent/US5708948A ## CPC - G03G 15/2057: {relating to the chemical composition of the heat element and layers thereof} - G03G 15/6585: {by using non-standard toners, e.g. transparent toner, gloss adding devices} - G03G 2215/00805: Gloss adding or lowering device - G03G 2215/2016: Heating belt - G03G 2215/2032: the belt further entrained around additional rotating belt support members - G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY ## Abstract This invention provides a fuser belt comprising a substrate and a coating on said substrate, said coating comprises a resin made by curing a composition comprising siloxanes having a ratio of difunctional to trifunctional units of 1:1 to 1:2.7 and at least 90% of total number of functional units in said siloxanes are difunctional and trifunctional units, a weight average molecular weight of 5,000 to 50,000 grams/mole, and an alkyl to aryl ratio of 1:0.1 to 1:1.2. ## Claims ### Claim 1 A fuser belt comprising a substrate and a coating on said substrate, said coating comprises a resin made by curing a composition comprising siloxanes having a ratio of difunctional to trifunctional units of 1:1 to 1:2.7 and at least 90% of total number of functional units in said siloxanes are difunctional and trifunctional units, a weight average molecular weight of 5,000 to 50,000 grams/mole, and an alkyl to aryl ratio of 1:0.1 to 1:1.2. ### Claim 2 (depends on 1) A fuser belt of claim 1 wherein said ratio of difunctional to trifunctional units is 1:1.5 to 1:2.5. ### Claim 3 (depends on 1) A fuser belt of claim 1 wherein said ratio of difunctional to trifunctional units is 1:1.8 to 1:2.3. ### Claim 4 (depends on 1) A fuser belt of claim 1 wherein said alkyl to aryl ratio is 1:0.3 to 1:1.0. ### Claim 5 (depends on 1) A fuser belt of claim 1 wherein said alkyl to aryl ratio is 1:0.4 to 1:0.9. ### Claim 6 (depends on 1) A fuser belt of claim 1 wherein said weight average molecular weight is 6,000 to 30,000 grams/mole. ### Claim 7 (depends on 1) A fuser belt of claim 1 wherein said weight average molecular weight is 7,500 to 15,000 grams/mole. ### Claim 8 (depends on 1) A fuser belt of claim 1 wherein said alkyl groups are methyl and said aryl groups are phenyl. ### Claim 9 (depends on 1) A fuser belt of claim 1 wherein said siloxanes are hydroxy-terminated. ### Claim 10 (depends on 1) A fuser belt of claim 1 which produces fused toner images having a G-20 gloss of greater than 70. ### Claim 11 (depends on 1) A fuser belt of claim 1 having a surface energy of 20 to 30 milliJoules/meter.sup.2. ### Claim 12 (depends on 1) A fuser belt of claim 1 wherein said siloxanes comprise less than 1% monofunctional units of total number of functional units in said siloxanes. ### Claim 13 (depends on 1) A fuser belt of claim 1 wherein said siloxanes comprise less than 1% monofunctional and tetrafunctional units of total number of functional units in said siloxanes. ### Claim 14 (depends on 1) A fuser belt of claim 1 wherein said ratio of difunctional to trifunctional units is 1:1.5 to 1:2.5 and at least 95% of total number of functional units in the silicone resin are difunctional and trifunctional units, said weight average molecular weight is 7,500 to 10,000 grams/mole, and said alkyl to aryl ratio is 1:0.1 to 1:1.2. ### Claim 15 (depends on 14) A fuser belt of claim 14 wherein said ratio of difunctional to trifunctional units is 1:1.8 to 1:2.3. ### Claim 16 (depends on 14) A fuser belt of claim 14 wherein said alkyl to aryl ratio is 1:0.3 to 1:1.0. ### Claim 17 (depends on 14) A fuser belt of claim 14 wherein said alkyl to aryl ratio is 1:0.4 to 1:0.9. ### Claim 18 A fuser belt comprising a substrate and a coating on said substrate, said coating comprises a resin made by curing a composition comprising siloxanes having a ratio of difunctional to trifunctional units of 1:1.8 to 1:2.3 and at least 98% of total number of functional units in said siloxanes are difunctional and trifunctional units, a weight average molecular weight of 7,500 to 8,500 grams/mole, and an an alkyl to aryl ratio of 1:0.4 to 1:0.9. ### Claim 19 A method of fusing comprising the steps of: passing a receiver bearing toner through the nip formed between a fuser belt and a roller to form a fixed toner image on said receiver, said fuser belt comprising a substrate and a coating on said substrate, said coating comprises a resin made by curing a composition comprising siloxanes having a ratio of difunctional to trifunctional units of 1:1 to 1:2.7 and at least 90% of total number of functional units in said siloxanes are difunctional and trifunctional units, a weight average molecular weight of 5,000 to 50,000 grams/mole, and an alkyl to aryl ratio of 1:0.1 to 1:1.2; cooling said fuser belt in contact with said fixed toner image on said receiver; and releasing said fixed toner image on said receiver from said fuser belt. ### Claim 20 (depends on 19) The method of fusing of claim 19 wherein said fixed toner image has a G-20 gloss of greater than 80.