Silicon composition, elastic revolution body and fixing device using the composition

Claim 2

An elastic revolution body comprising an elastic body comprising at least a surface layer thereof formed from a silicon rubber composition, said silicone rubber composition comprising an addition reaction-type silicone rubber composition prepared from a mixture of (A) a dimethylpolysiloxane having a vinyl group, a methylhydrogenpolysiloxane and a platinum-based catalyst, (B) reactive group-containing modified silicic acid powder of which surface has been modified with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) a hexamethyldisilazane, (c) a dimethylsilicone oil and (d) a mixture thereof, and (ii) an unsaturated group-containing silane compound, followed by drying and (C) inorganic fine powder impregnated with a surfactant, said inorganic fine powder having a pore diameter of 0.01 to 30 microns, an average particle size of 5 to 70 microns and an oil absorption of 200-800 ml/100 g, wherein said inorganic fine powder is impregnated with an amount of surfactant sufficient to produce said silicone rubber composition containing surfactant in a proportion of 0.1-10 wt % and wherein said surfactant is a fluorine-containing surfactant selected from the group consisting of fluorinated alkyl esters, perfluoroalkylpolyoxyethylene ethanol, perfluoroalkylcarboxylic acid salts, perfluoroalkylammonium salts, perfluoroalkylbetaine, perfluoroalkylamine oxide, perfluoroalkylethylene oxide adducts, perfluoroalkyl phosphates, non-dissociative perfluoroalkyl compounds and perfluoro-ethylene oxide adducts or a silicone-containing surfactant selected from the group consisting of polyether-modified silicone oil, epoxypolyether-modified silicone oil, alkylaralkylpolyether-modified silicone oil and amino-modified silicone oil.

Claim 3

A revolution body according to claim 1, wherein said silicone rubber composition comprises a dimethylpolysiloxane having a vinyl group, methylhydrogenpolysiloxane, a platinum-based catalyst, reactive group-containing modified silicic acid powder and inorganic fine powder impregnated with a surfactant and is heat-cured to provide at least the surface layer of the elastic body.

Claim 4

A revolution body according to claim 2, wherein said reactive group-containing modified silicic acid powder has been obtained by treating synthetic silicic acid powder with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) hexamethyldisilazane and (c) a dimethylsilicone and (ii) a vinyl group-containing silane compound, and said inorganic fine powder impregnated with a surfactant comprises inorganic fine powder impregnated with a fluorine-containing surfactant.

Claim 5

A revolution body according to claim 2, wherein said synthetic silicic acid has a particle size of 7-100 mμ and a BET specific surface area of 40-500 m 2 /g.

Claim 6

A revolution body according to claim 2, wherein said reactive group-containing modified silicic acid powder is contained in a proportion of 0.5-20 wt. parts per 100 wt. parts of the addition reaction-type silicone rubber.

Claim 7

A revolution body according to claim 2, wherein said reactive group-containing modified silicic acid powder is contained in a proportion of 1-15 wt. parts per 100 wt. parts of the addition reaction-type silicone rubber.

Claim 8

A revolution body according to claim 2, wherein said inorganic fine powder impregnated with 100-600 parts by weight of the surfactant per 100 parts by weight of the inorganic fine powder.

Claim 9

A revolution body according to claim 2, wherein said inorganic fine powder impregnated with 400-500 parts by weight of the surfactant per 100 parts by weight of the inorganic fine powder.

Claim 10

A revolution body according to claim 3, wherein said fluorine-containing surfactant is contained in a proportion of 0.1-10 wt. % with respect to the addition reaction-type silicone rubber.

Claim 11

A revolution body according to claim 3, wherein said fluorine-containing surfactant is contained in a proportion of 0.5-5 wt. % with respect to the addition reaction-type silicone rubber.

Claim 12

A revolution body according to claim 2, wherein said dimethylpolysiloxane having a vinyl group is represented by at least one of the following two formulas ##STR12## wherein l is a positive integer, or ##STR13## wherein m and n respectively denote a positive integer and k denotes 0 or a positive integer.

Claim 13

A revolution body according to claim 11, wherein l denotes an integer of 50-2000 or m+k makes an integer of 50-2000 and n denotes an integer of 1-10.

Claim 14

A revolution body according to claim 2, wherein said methylhydrogenpolysiloxane is represented by the formula: ##STR14## wherein p and q respectively denote a positive integer and r denotes 0 or a positive integer.

Claim 15

A revolution body according to claim 13, wherein p+r makes an integer of 50-500, and q is an integer of 1-10.

Claim 16

A fixing device comprising a pair of rollers for passing therebetween a toner-supporting material carrying an unfixed toner image to fix the toner image onto the toner image-supporting material, wherein at least one of said pair of rollers comprises an elastic surface layer formed from a silicone rubber composition wherein, the silicone rubber composition comprises an addition reaction-type silicon rubber composition prepared from a mixture of (A) a dimethylpolysiloxane having a vinyl group, a methylhydrogenpolysiloxane and a platinum-based catalyst, (B) reactive group-containing modified silicic acid powder of which surface has been modified with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) a hexamethyldisilazane, (c) a dimethylsilicone oil and (d) a mixture thereof, and (ii) an unsaturated group-containing silane compound, followed by drying and (C) inorganic fine powder impregnated with a surfactant, said inorganic fine powder having a pore diameter of 0.01 to 30 microns, an average particle size of 5 to 70 microns and an oil absorption of 200-800 ml/100 g, wherein said inorganic fine powder is impregnated with an amount of surfactant sufficient to produce said silicone rubber composition containing surfactant in a proportion of 0.1-10 wt % and wherein said surfactant is a fluorine-containing surfactant selected from the group consisting of fluorinated alkyl esters, perfluoroalkylpolyoxyethylene ethanol, perfluoroalkylcarboxylic acid salts, perfluoroalkylammonium salts, perfluoroalkylbetaine, perfluoroalkylamine oxide, perfluoroalkylethylene oxide adducts, perfluoroalkyl phosphates, non-dissociative perfluoroalkyl compounds and perfluoro-ethylene oxide adducts or a silicone-containing surfactant selected from the group consisting of polyether-modified silicone oil, epoxypolyether-modified silicone oil, alkylaralkylpolyether-modified silicone oil and amino-modified silicone oil.

Claim 17

A fixing device comprising a pair of rollers for passing therebetween a toner-supporting material carrying an unfixed toner image to fix the toner image onto the toner image-supporting material, wherein at least one of said pair of rollers comprises an elastic surface layer formed from a silicone rubber composition wherein, the silicone rubber composition comprises an addition reaction-type silicon rubber composition prepared from a mixture of (A) a dimethylpolysiloxane having a vinyl group, a methylhydrogenpolysiloxane and a platinum-based catalyst, (B) reactive group-containing modified silicic acid powder of which surface has been modified with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) a hexamethyldisilazane, (c) a dimethylsilicone oil and (d) a mixture thereof, and (ii) an unsaturated group-containing silane compound, followed by drying and (C) inorganic fine powder impregnated with a surfactant, said inorganic fine powder having a pore diameter of 0.01 to 30 microns, an average particle size of 5 to 70 microns and an oil absorption of 200-800 ml/100 g, wherein said inorganic fine powder is impregnated with an amount of surfactant sufficient to produce said silicone rubber composition containing surfactant in a proportion of 0.1-10 wt % and wherein said surfactant is a fluorine-containing surfactant selected from the group consisting of fluorinated alkyl esters, perfluoroalkylpolyoxyethylene ethanol, perfluoroalkylcarboxylic acid salts, perfluoroalkylammonium salts, perfluoroalkylbetaine, perfluoroalkylamine oxide, perfluoroalkylethylene oxide adducts, perfluoroalkyl phosphates, non-dissociative perfluoroalkyl compounds and perfluoro-ethylene oxide adducts or a silicone-containing surfactant selected from the group consisting of polyether-modified silicone oil, epoxypolyether-modified silicone oil, alkylaralkylpolyether-modified silicone oil and amino-modified silicone oil.

Claim 18

A fixing device according to claim 15, wherein said silicone rubber composition comprises a dimethylpolysiloxane having a vinyl group, methylhydrogenpolysiloxane, a platinum-based catalyst, reactive group-containing modified silicic acid powder and inorganic fine powder impregnated with a surfactant and is heat-cured to provide the elastic surface layer.

Claim 19

A fixing device according to claim 16, wherein said reactive group-containing modified silicic acid powder has been obtained by treating synthetic silicic acid powder with (i) a compound selected from the group consisting of (a) an alkylsilane, (b) hexamethyldisilazane and (c) a dimethylsilicone, and (ii) a vinyl group-containing silane compound, and said inorganic fine powder impregnated with a surfactant comprises inorganic fine powder impregnated with a fluorine-containing surfactant.

Claim 20

A fixing device according to claim 16, wherein said synthetic silicic acid has a particle size of 7-100 mμ and a BET specific surface area of 40-500 m 2 /g.

Claim 21

A fixing device according to claim 16, wherein said reactive group-containing modified silicic acid powder is contained in a proportion of 0.5-20 wt. parts per 100 wt. parts of the addition reaction-type silicone rubber.

Claim 22

A fixing device according to claim 16, wherein said reactive group-containing modified silicic acid powder is contained in a proportion of 1-15 wt. parts per 100 wt. parts of the addition reaction-type silicone rubber.

Claim 23

A fixing device according to claim 16, wherein said inorganic fine powder impregnated with 100-600 parts by weight of the surfactant per 100 parts by weight of the inorganic fine powder.

Claim 24

A fixing device according to claim 16, wherein said inorganic fine powder impregnated with 400-500 parts by weight of the surfactant per 100 parts by weight of the inorganic fine powder.

Claim 25

A fixing device according to claim 17, wherein said fluorine-containing surfactant is contained in a proportion of 0.1-10 wt. % with respect to the addition reaction-type silicone rubber.

Claim 26

A fixing device according to claim 17, wherein said fluorine-containing surfactant is contained in a proportion of 0.5-5 wt. % with respect to the addition reaction-type silicone rubber.

Claim 27

A fixing device according to claim 16, wherein said dimethylpolysiloxane having a vinyl group is represented by at least one of the following two formulas ##STR15## wherein l is a positive integer, or ##STR16## wherein m and n respectively denote a positive integer and k denotes 0 or a positive integer.

Claim 28

A fixing device according to claim 25, wherein l denotes an integer of 50-2000 or m+k makes an integer of 50-2000 and n denotes an integer of 1-10.

Claim 29

A fixing device according to claim 16, wherein said methylhydrogenpolysiloxane is represented by the formula: ##STR17## wherein p and q respectively denote a positive integer and r denotes 0 or a positive integer.

Claim 30

A fixing device according to claim 27, wherein p+r makes an integer of 50-500, and q is an integer of 1-10.

Claim 31

A fixing device according to claim 15, wherein said pair of rollers comprises a pressing roller and a heating roller.

Claim 32

A fixing device according to claim 29, wherein said pressing roller is provided with a conducting means for grounding.

Claim 33

A fixing device according to claim 29, wherein said heating roller is equipped with a heater disposed inside thereof.