Patent ID: 11905368
Assignee: SHIN-ETSU CHEMICAL CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC C

Claim 0:
1. A water repellent member comprising:
a substrate having an outer surface, wherein the substrate is of aluminum or alloy thereof,
a silica layer disposed on the substrate outer surface, wherein the silica layer consists of (i) 100% by weight of silica nanoparticles having an average particle size of 0.1 nm to 10 nm, or (ii) at least 50% by weight of silica nanoparticles having an average particle size of 0.1 nm to 10 nm and 0.1 to 50% by weight of nanoparticles having an average particle size of 1 nm to 10 nm and selected from titanium oxide, tin oxide, silver, platinum, copper, alumina, calcium oxide, magnesium oxide, manganese oxide, nickel oxide, zirconium oxide and multi-component oxides,
wherein in (ii), the sum of the silica nanoparticles and the nanoparticles is equal to 100% by weight;
wherein the silica layer is formed by wet coating and has a thickness of 1 nm to 5 μm, and
a water/oil repellent layer disposed on an outer surface of the silica layer, wherein the water/oil repellent layer is composed mainly of a cured product of a fluorinated organosilicon compound, and wherein the water/oil repellent layer has a thickness of 0.5 to 30 nm, and
wherein the fluorinated organosilicon compound is at least one compound selected from the following hydrolyzable organosilicon compounds:, , wherein Me is methyl, p1, q1, r1, s1, and t1 are each independently an integer of 1 to 200, wherein the sum of p1, q1, r1, s1, and t1 is 3 to 500, each unit in parentheses may be randomly arranged,
wherein the cured product has a water contact angle from 102-113° after an abrasion test.