Scratch resistant, easy-to-clean coatings, methods of producing the same and the use thereof
A computer or personal communication device or a similar device, comprising a CPU; and a display; wherein the display comprises; an array of optical elements; a touch sensor; and a glass cover having a coating that is oleophobic. The coating of the glass is a polymer having silicon, oxygen and carbon in the backbone. Optionally it may comprise fluorine. The coating has a water contact angle of 65 or more, an oil contact angle of 20 degrees or more, and a pencil hardness of 7H or more. Thus, the coating combines properties of hydro-and oleophobicity and hardness.
1. A method for making a coated glass, the method comprising:
coating a glass with a liquid phase coating; and
baking, UV hardening, or both, the coating on the glass, wherein:
the coated glass comprises a polymer having silicon, oxygen and carbon in the backbone;
the coating on the glass has a refractive index of 1.22 to 1.5, a pencil hardness of 8H or more, a water contact angle of 90 degrees or more, and an oil contact angle of 35 degrees or more; and
the coating deposited by the liquid phase coating is formed by combining:
a first monomer having the chemical formula:
R 11 x R 12 y SiC 3 H 6 R 13 ,
wherein
R 11 is an alkoxy, acetoxy or chloro group and where x is 2 or 3,
R 12 is an alkyl group where y is 0 or 1, and
R 13 is an epoxy, acrylate, methacrylate, group;
a second monomer having the chemical formula:
R 14 a R 15 b SiC 2 H 4 (CF) n CF 3 ,
wherein
R 14 is an alkoxy, acetoxy or chloro group and where a is 2 or 3,
R 15 is an alkyl group where b is 0 or 1, and
n is an integer from 3 to 25; and
a third monomer having the chemical formula:
R 16 c R 17 d SiC 2 H 4 SiR 18 e R 19 f ,
wherein
R 16 is a an alkoxy, acetoxy or chloro group and wherein c=2 or 3,
R 17 is an alkyl group or H and wherein d=0 or 1,
R 18 is an alkoxy, acetoxy or chloro group and wherein e=2 or 3, and
R 19 is an alkyl group or H and wherein f=0 or 1.
2. A method of increasing the hardness and oleophobicity of a computer or personal communication device having a touch sensitive screen, the method comprising:
polymerizing a plurality of monomers that comprise silicon, oxygen and carbon so as to form a carbosiloxane polymer with a molecular weight of at least 2000;
depositing the carbosiloxane polymer with a liquid phase process at atmospheric pressure on a glass substrate; and
further providing a CPU, a display, a touch sensor layer, and a housing so as to form the computer or personal communication device with a touch sensitive screen,
wherein:
after hardening the polymer on the glass substrate, the carbosiloxane polymer has a hardness of at least 8H, a refractive index of from 1.22 to 1.46, a water contact angle of at least 90 degrees, and an oil contact angle of at least 35 degrees;
the amount of sunlight reflected from the glass substrate is at least 1.5% less due to the carbosiloxane polymer layer as compared to the same glass substrate without the carbosiloxane polymer layer
the carbosiloxane polymer is formed by combining:
a first monomer having the chemical formula:
R 11 x R 12 y SiC 3 H 6 R 13 ,
wherein
R 11 is an alkoxy, acetoxy or chloro group and where x is 2 or 3,
R 12 is an alkyl group where y is 0 or 1, and
R 13 is an epoxy, acrylate, methacrylate group;
a second monomer having the chemical formula:
R 14 a R 15 b SiC 2 H 4 (CF) n CF 3 ,
wherein
R 14 is an alkoxy, acetoxy or chloro group and where a is 2 or 3,
R 15 is an alkyl group where b is 0 or 1, and
n is an integer from 3 to 25; and
a third monomer having the chemical formula:
R 16 c R 17 d SiC 2 H 4 SiR 18 e R 19 f ,
wherein
R 16 is a an alkoxy, acetoxy or chloro group and wherein c=2 or 3,
R 17 is an alkyl group or H and wherein d=0 or 1,
R 18 is an alkoxy, acetoxy or chloro group and wherein e=2 or 3, and
R 19 is an alkyl group or H and wherein f=0 or 1.