US2013045387A1PendingUtilityA1

Articles, Coating Compositions, and Methods

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Assignee: 3M INNOVATIVE PROPERTIES COPriority: May 11, 2010Filed: Apr 25, 2011Published: Feb 21, 2013
Est. expiryMay 11, 2030(~3.8 yrs left)· nominal 20-yr term from priority
Inventors:Yiwen ChuZhigang YuNaiyong JingRui Pan
H10F 77/315C09D 7/61C09D 7/67C03C 2217/465Y10T428/31645C08K 3/36C03C 2217/478Y10T428/315Y02E10/50C08K 9/06Y10T428/31667C09D 1/00C03C 17/007Y10T428/31525C09D 7/70C03C 2217/425
60
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Claims

Abstract

There is provided a coating composition comprising nonspherical nanoparticles; spherical nanoparticles; optionally hydrophilic groups and optional an surfactant; and a liquid medium comprising water and no greater than 30 wt % organic solvent, if present, based on the total weight of liquid medium, where at least a portion of the nonspherical nanoparticles or at least a portion of the spherical nanoparticles comprises functional groups attached to their surface through chemical bonds, wherein the functional groups comprise at least one group selected from the group consisting of epoxy group, amine group, hydroxyl, olefin, alkyne, (meth) acrylato, mercapto group, or combinations thereof. There is also provided a method for modifying a substrate surface using the coating composition and articles made therefrom.

Claims

exact text as granted — not AI-modified
1 . A method of modifying a substrate surface, the method comprising:
 (a) applying a coating composition to a substrate, wherein the coating composition comprises:
 (i) nonspherical nanoparticles; 
 (ii) spherical nanoparticles; 
 (iii) optionally hydrophilic groups and optionally a surfactant; and 
 (iv) a liquid medium comprising water and no greater than 30 wt % organic solvent, if present, based on the total weight of liquid medium, 
 wherein at least a portion of the nonspherical nanoparticles or at least a portion of the spherical nanoparticles comprises functional groups attached to the surface of the nonspherical nanoparticles or the spherical nanoparticles through chemical bonds, and further wherein the functional groups comprise at least one group selected from epoxy group, amine group, hydroxyl, olefin, alkyne, (meth) acrylato, mercapto, or combinations thereof; and 
   (b) drying the coating composition to form a hydrophilic coating on the substrate.   
     
     
         2 . The method of  claim 1  wherein all the nonspherical nanoparticles or all the spherical nanoparticles comprise the functional groups. 
     
     
         3 . The method of  claim 1  wherein the weight ratio of the nonspherical nanoparticles to the spherical nanoparticles ranges from 95:5 to 5:95. 
     
     
         4 . The method of  claim 3  wherein the weight ratio of the nonspherical nanoparticles to the spherical nanoparticles ranges from 80:20 to 20:80. 
     
     
         5 . The method of  claim 4  wherein the weight ratio of the nonspherical nanoparticles to the spherical nanoparticles ranges from 70:30 to 30:70. 
     
     
         6 . The method of  claim 1  wherein at least a portion of the nonspherical nanoparticles comprise silica nanoparticles. 
     
     
         7 . The method of  claim 1  wherein at least a portion of the spherical nanoparticles comprise silica nanoparticles. 
     
     
         8 . The method of  claim 1  wherein the substrate is glass or ceramic. 
     
     
         9 . The method of  claim 1  wherein the method further comprises the step of sintering the coated substrate at a temperature ranging from 200 degrees C. to 750 degrees C. 
     
     
         10 . The method of  claim 1  wherein the nonspherical nanoparticles have an average particle size between 1 and 200 nm and an aspect ratio between 2 and 100. 
     
     
         11 . The method of  claim 1  wherein the spherical nanoparticles have an average particle size between 1 and 120 nm. 
     
     
         12 . The method of  claim 1  wherein the coating composition comprises at least 0.05 wt % nonspherical nanoparticles and no greater than 40 wt % nonspherical nanoparticles, based on the total weight of the coating composition. 
     
     
         13 . The method of  claim 1  wherein the coating composition comprises at least 0.05 wt % spherical nanoparticles and no greater than 40 wt % spherical nanoparticles, based on the total weight of the coating composition. 
     
     
         14 . The method of  claim 1  wherein the coating composition comprises 0.01-5 wt % surfactant, based on the total weight of the coating composition. 
     
     
         15 . The method of  claim 1  wherein the nonspherical nanoparticles are elongated nanoparticles. 
     
     
         16 . The method of  claim 1  wherein the spherical nanoparticles comprise the functional groups. 
     
     
         17 . An article comprising a substrate surface modified using the method of  claim 1 . 
     
     
         18 . A coating composition comprising
 nonspherical nanoparticles;   spherical nanoparticles;   optionally hydrophilic groups and optional an surfactant; and   a liquid medium comprising water and no greater than 30 wt % organic solvent, if present, based on the total weight of liquid medium,   wherein at least a portion of the nonspherical nanoparticles or at least a portion of the spherical nanoparticles comprises functional groups attached to their surface through chemical bonds, wherein the functional groups comprise at least one group selected from the group consisting of epoxy group, amine group, hydroxyl, olefin, alkyne, (meth) acrylato, mercapto group, or combinations thereof.   
     
     
         19 . The composition of  claim 18  wherein all the nonspherical nanoparticles or all the spherical nanoparticles comprise the functional groups. 
     
     
         20 . The composition of  claim 18  wherein the weight ratio of the nonspherical nanoparticles to the spherical nanoparticles ranges from 95:5 to 5:95. 
     
     
         21 . The composition of  claim 20  wherein the weight ratio of the nonspherical nanoparticles to the spherical nanoparticles ranges from 70:30 to 30:70. 
     
     
         22 . The composition of  claim 18  wherein at least a portion of the nonspherical nanoparticles comprise silica nanoparticles. 
     
     
         23 . The composition of  claim 18  wherein at least a portion of the spherical nanoparticles comprise silica nanoparticles. 
     
     
         24 . The composition of  claim 18  wherein the substrate is glass or ceramic. 
     
     
         25 . The composition of  claim 18  wherein the nonspherical nanoparticles have an average particle size between 1 and 200 nm and an aspect ratio between 2 and 100. 
     
     
         26 . The composition of  claim 18  wherein the spherical nanoparticles have an average particle size between 1 and 120 nm. 
     
     
         27 . The composition of  claim 18  wherein the coating composition comprises at least 0.05 wt % nonspherical nanoparticles and no greater than 40 wt % nonspherical nanoparticles, based on the total weight of the coating composition. 
     
     
         28 . The composition of  claim 18  wherein the coating composition comprises at least 0.05 wt % spherical nanoparticles and no greater than 40 wt % spherical nanoparticles, based on the total weight of the coating composition. 
     
     
         29 . The composition of  claim 18  wherein the coating composition comprises 0.01-5 wt % surfactant, based on the total weight of the coating composition. 
     
     
         30 . The composition of  claim 18  wherein a dried coating provides antireflective, easy cleaning and/or durability characteristics to the substrate for at least 24 hours. 
     
     
         31 . The composition of  claim 18  wherein the nonspherical nanoparticles are elongated nanoparticles. 
     
     
         32 . The composition of  claim 18  wherein the spherical nanoparticles comprise the functional groups. 
     
     
         33 . An article comprising a substrate surface modified using the coating composition of  claim 18 . 
     
     
         34 . The article of  claim 33  which is a solar panel. 
     
     
         35 . The article of  claim 33  wherein the substrate is glass. 
     
     
         36 . The article of  claim 35  wherein the glass is tempered.

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