Claims
- 1. A fuser roll for use in an electrophotographic process comprising on the surface of said fuser roll an amount effective for release of toner of a heat stable silicone copolymer having structural units of the formulae: ##STR8## wherein (i) each R is independently a C.sub.1 -C.sub.6 alkyl, (ii) each R.sup.1 is independently selected from the group consisting of a C.sub.2 -C.sub.14 alkyl and a C.sub.15 -C.sub.60 alkyl, with the proviso that from about 70% to about 100% of all R.sup.1 groups are C.sub.15 -C.sub.60 alkyl, and (iii) x represents from about 75.0 to about 98.5 mole percent, and y represents from about 1.5 to about 25.0 mole percent of the silicone copolymer, based on total moles of the silicone copolymer.
- 2. A release agent composition in accordance with claim 1 wherein said silicone copolymer is a block copolymer or a random copolymer.
- 3. A release agent composition in accordance with claim 2 wherein said silicone copolymer is a random copolymer.
- 4. A release agent composition in accordance with claim 3 wherein said silicone copolymer is terminated with groups having the formulae: ##STR9## wherein each R.sup.2 is independently a C.sub.1 -C.sub.6 alkyl or aryl group.
- 5. A release agent composition in accordance with claim 4 wherein R is a methyl group.
- 6. A release agent composition in accordance with claim 4 wherein R.sup.2 is a methyl group.
- 7. A release agent composition in accordance with claim 4 wherein said silicone copolymer has a weight average molecular weight from about 10,000 to about 1,000,000.
- 8. A release agent composition in accordance with claim 7 wherein said silicone copolymer has a weight average molecular weight from about 80,000 to about 250,000.
- 9. A release agent composition according to claim 8 having a viscosity of from about 2,000 to about 10,000 centipoise at about 93.degree. C.
- 10. A release agent composition according to claim 9 having a melting point of from about 45.degree. C. to about 80.degree. C.
- 11. A release agent composition according to claim 10 which contains from about 50% to about 97% of said copolymer.
- 12. A release agent composition according to claim 11 which additionally comprises from about 0.5% to about 30% of a viscosity modifier.
- 13. A release agent composition according to claim 12 wherein said viscosity modifier is selected from the group consisting of amorphous silica, silicone oil, and mixtures thereof.
- 14. A release agent composition according to claim 11 which additionally comprises from about 3% to about 20% of an antioxidant.
- 15. A release agent composition according to claim 14 wherein the antioxidant is a mixture of hindered phenol, phosphite and thiodipropionate antioxidants.
- 16. A release agent composition according to claim 11 wherein x represents from about 85 to about 98 mole percent and y represents from about 2 to about 15 mole percent of the silicone copolymer.
- 17. A release agent composition according to claim 16 wherein the major component of R.sup.1 is C.sub.30 -C.sub.45 alkyl.
- 18. A release agent composition according to claim 17 wherein x is about 97 mole percent and y is about 3.0 mole percent of the silicone copolymer.
- 19. A release agent composition according to claim 18 wherein the major component of R.sup.1 is C.sub.36 alkyl.
- 20. A pad used for dispensing a release agent in an electrophotographic process comprising a felt pad constructed from a temperature resistant fiber saturated with from about 6 to about 10 grams of a release agent composition suitable for use on the hot fuser roll of an electrophotographic process, comprising an effective amount of a heat stable silicone copolymer having structural units of the formulae: ##STR10## wherein (i) each R is independently a C.sub.1 -C.sub.6 alkyl, (ii) each R.sup.1 is independently selected from the group consisting of a C.sub.2 -C.sub.14 alkyl and a C.sub.15 -C.sub.60 alkyl, with the proviso that from about 70% to about 100% of all R.sup.1 groups are C.sub.15 -C.sub.60 alkyl, and (iii) x represents from about 75.0 to about 98.5 mole percent, and y represents from about 1.5 to about 25.0 mole percent of the silicone copolymer, based on total moles of the silicone copolymer.
- 21. A fuser roll in accordance with claim 1 in which said R of said silicone copolymer is methyl.
- 22. A fuser roll in accordance with claim 2 in which said R of said silicone copolymer is methyl.
- 23. A fuser roll in accordance with claim 3 in which said R of said silicone copolymer is methyl.
Parent Case Info
This application is a continuation-in-part of U.S. patent application Ser. No. 08/855,374, Beach, et al., filed May 13, 1997.
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Continuation in Parts (1)
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855374 |
May 1997 |
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