US4075362A — Method for providing heated fuser roll with impro…

Claim 1

Independent Claim 216 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 to 30% by weight, based on the weight of (A) plus (B), of I, II or a mixture of I and II; wherein (I) is a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluorolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (II) is a fluorosurfactant, wherein said fluorosurfactant is a mixture of mono- and di- esters of phosphoric acid prepared with an alcohol of formula F(CF 2 CF 2 ) n CH 2 CH 2 OH, where n is from 3 to 8; admixed with (B) 95 to 70% by weight based on the weight of (A) plus (B) of a silicone oil dispersing agent, wherein said dispersing agent has surface tension of 16 to 30 dynes/centimeter, viscosity range of 0.5 to 100,000 centistokes at 25° C, and a maximum vapor pressure of 200 mmHg at 205° C.

Claim 2

Dependent Claim 216 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 to 30% by weight, based on the weight of (A) plus (B), of I, II or a mixture of I and II; wherein (I) is a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluorolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (II) is a fluorosurfactant, wherein said fluorosurfactant is a mixture of mono- and di- esters of phosphoric acid prepared with an alcohol of formula F(CF 2 CF 2 ) n CH 2 CH 2 OH, where n is from 3 to 8; admixed with (B) 95 to 70% by weight based on the weight of (A) plus (B) of a silicone oil dispersing agent, wherein said dispersing agent has surface tension of 16 to 30 dynes/centimeter, viscosity range of 0.5 to 100,000 centistokes at 25° C, and a maximum vapor pressure of 200 mmHg at 205° C.

Claim 3

Dependent Claim 11 words

The process of claim 1 wherein the perfluoroolefin polymer is polytetrafluoroethylene.

Claim 4

Dependent Claim 41 words

The process of claim 1 wherein the perfluoroolefin polymer is a fluorinated ethylene propylene; wherein said polymer contains 75 to 80% by weight, based on the polymer, of tetrafluoroethylene and 25 to 20% by weight, based on the polymer, of hexafluoropropylene.

Claim 5

Dependent Claim 41 words

The process of claim 1 wherein the perfluoroolefin polymer is a fluorinated ethylene propylene: wherein said polymer contains 84 to 88% by weight, based on the polymer, of tetrafluoroethylene and 16 to 12% by weight, based on the polymer, of hexafluoropropylene.

Claim 6

Dependent Claim 41 words

The process of claim 1 wherein the perfluoroolefin polymer is a fluorinated ethylene propylene; wherein said polymer contains 93 to 95% by weight, based on the polymer, of tetrafluoroethylene and 7 to 5% by weight, based on the polymer, of hexafluoropropylene.

Claim 7

Dependent Claim 40 words

The process of claim 1 wherein the dispersing agent is an organopolysiloxane of the general formula ##EQU2## wherein x is 1, 2 or 3, R is a monovalent hydrocarbon radical, and n is an integer which varies with the viscosity.

Claim 8

Dependent Claim 29 words

The process of claim 6 wherein R is methyl, x is 2, and n is such that the viscosity range is between 0.5 and 100,000 centistokes at 25° C.

Claim 9

Dependent Claim 215 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 to 30% by weight, based on the weight of (A) plus (B), of I, II or a mixture of I and II: wherein (I) is a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (II) is a fluorosurfactant, wherein said fluorosurfactant is a mixture of mono- and di- esters of phosphoric acid prepared with an alcohol of formula F(CF 2 CF 2 ) n CH 2 CH 2 OH, where n is from 3 to 8; admixed with (B) 95 to 70% by weight, based on the weight of (A) plus (B). of an organopolysiloxane of the general formula ##EQU3## wherein x is 1, 2 or 3, R is a monovalent hydrocarbon radical, and n is such so as to provide a viscosity range of 10-10,000 centistokes at 25° C.

Claim 10

Dependent Claim 215 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 to 30% by weight, based on the weight of (A) plus (B), of I, II or a mixture of I and II: wherein (I) is a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (II) is a fluorosurfactant, wherein said fluorosurfactant is a mixture of mono- and di- esters of phosphoric acid prepared with an alcohol of formula F(CF 2 CF 2 ) n CH 2 CH 2 OH, where n is from 3 to 8; admixed with (B) 95 to 70% by weight, based on the weight of (A) plus (B). of an organopolysiloxane of the general formula ##EQU3## wherein x is 1, 2 or 3, R is a monovalent hydrocarbon radical, and n is such so as to provide a viscosity range of 10-10,000 centistokes at 25° C.

Claim 11

Dependent Claim 159 words

In a xerograpic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 - 30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (B) 95 to 70% by weight, based on the weight of (A) plus (B), of an organopolysiloxane of the general formula ##EQU4## wherein x is 1, 2 or 3, R is a monovalent hydrocarbon radical, and n is such so as to provide a viscosity range of 10-10,000 centistokes at 25° C.

Claim 12

Dependent Claim 159 words

In a xerograpic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 5 - 30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 5 to 100% by weight, based on the perfluoroolefin polymer, of tetrafluoroethylene and 95 to 0% by weight, based on the perfluoroolefin polymer, of hexafluoropropylene and (B) 95 to 70% by weight, based on the weight of (A) plus (B), of an organopolysiloxane of the general formula ##EQU4## wherein x is 1, 2 or 3, R is a monovalent hydrocarbon radical, and n is such so as to provide a viscosity range of 10-10,000 centistokes at 25° C.

Claim 13

Dependent Claim 131 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 10 to 30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75-80% by weight, based on the polymer, of tetrafluoroethylene and 25-20% by weight, based on the polymer, of hexafluoropropylene; and (B) 90 to 70% by weight, based on the weight of (A) plus (B), of a dimethyl siloxane polymer having a viscosity of 0.5 to 100,000 centistokes at 25° C.

Claim 14

Dependent Claim 131 words

In a xerographic printing process, wherein the image particles are fused onto a supporting sheet by passing said sheet between a pressure roll and a heated fuser roll, the image particles come into contact with the metal surface of said fuser roll; the improvement consisting essentially of continuously applying to said surface a layer of an offset preventing composition consisting essentially of (A) 10 to 30% by weight, based on the weight of (A) plus (B), of a perfluoroolefin polymer containing 75-80% by weight, based on the polymer, of tetrafluoroethylene and 25-20% by weight, based on the polymer, of hexafluoropropylene; and (B) 90 to 70% by weight, based on the weight of (A) plus (B), of a dimethyl siloxane polymer having a viscosity of 0.5 to 100,000 centistokes at 25° C.

Claim 15

Dependent Claim 25 words

The process of claim 2 wherein the dispersing agent is a dimethyl siloxane polymer having a viscosity of 0.5 to 100,000 centistokes at 25° C.

Claim 16

Dependent Claim 24 words

The process of claim 4 wherein the dispersing agent is a dimethylsiloxane polymer having a viscosity of 0.5 to 100,000 centistokes at 25° C.

Claim 17

Dependent Claim 53 words

The process of claim 10 wherein said composition contains 18 to 22% by weight, based on the weight of the composition, of said perfluoroolefin polymer and 82 to 78% by weight, based on the weight of the composition, of a dimethylsiloxane polymer having a viscosity of 50 to 1,000 centistokes at 25° C.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1981-02-20	1981-08-22	1982-02-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1985-02-20	1985-08-22	1986-02-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1989-02-20	1989-08-22	1990-02-21	$7700.00	Window Closed / Lapsed

Method for providing heated fuser roll with improved release and wear life

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