Process for the preparation of photosensitive body surface coating material
First Claim
1. A process for the preparation of a photosensitive body surface coating material, the process comprising:
- i) forming a polysiloxane and coating the polysiloxane on a substrate, wherein the polysiloxane is formed by hydrolytic condensation of a silane in the presence of a mixed solvent comprising alcohol and water in the presence of finely divided silica;
wherein the silane has a formula R2 Si(OR3)3, wherein each R2 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms; and
R3 is a straight-chain saturated hydrocarbon group of 1 to 8 carbon atoms; and
ii) heat curing the polysiloxane to form a polysiloxane resin of formula R1 SiO3/2, wherein each R1 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms; and
with the proviso that not less than 1 mol % and not more than 80 mol % of all the R1 groups are fluorohydrocarbon groups; and
wherein the polysiloxane is selected such that, after heat curing, the polysiloxane resin has a water contact angle of not less than 95°
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Abstract
A process for the preparation of a photosensitive body surface coating material comprises hydrolytically condensing an alkoxysilane in a mixed solvent comprising an alcohol and water in the presence of finely divided silica. A polysiloxane resin is produced by heat curing the silane after its hydrolytic condensation. The polysiloxane resin has the formula: R1 SiO3/2, and R1 comprises fluorohydrocarbon groups. The photosensitive body surface coating material is not detrimental to the functionality required of the electrophotographic photosensitive bodies, has superior optical uniformity, has low surface energy, and has superior surface hardness.
11 Citations
16 Claims
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1. A process for the preparation of a photosensitive body surface coating material, the process comprising:
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i) forming a polysiloxane and coating the polysiloxane on a substrate, wherein the polysiloxane is formed by hydrolytic condensation of a silane in the presence of a mixed solvent comprising alcohol and water in the presence of finely divided silica;
wherein the silane has a formula R2 Si(OR3)3, wherein each R2 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms; and
R3 is a straight-chain saturated hydrocarbon group of 1 to 8 carbon atoms; andii) heat curing the polysiloxane to form a polysiloxane resin of formula R1 SiO3/2, wherein each R1 is selected from the group consisting of fluorohydrocarbon groups of 3 to 12 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms, saturated hydrocarbon groups of 1 to 18 carbon atoms having oxygen atoms, and aromatic hydrocarbon groups of 6 to 18 carbon atoms; and
with the proviso that not less than 1 mol % and not more than 80 mol % of all the R1 groups are fluorohydrocarbon groups; and
wherein the polysiloxane is selected such that, after heat curing, the polysiloxane resin has a water contact angle of not less than 95°
. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification