US2004202601A1PendingUtilityA1

Inorganic particles and methods of making

50
Assignee: MILLENNIUM INORGANIC CHEMPriority: Jul 30, 2001Filed: Apr 30, 2004Published: Oct 14, 2004
Est. expiryJul 30, 2021(expired)· nominal 20-yr term from priority
Inventors:Fu-Chu WenDuen-Wu HuaDeborah E. Busch
D21H 17/675C09D 7/67C09D 7/62C01P 2004/38C08K 3/22C08K 9/02C01P 2004/61C01P 2004/04D21H 17/69C08K 3/26C08K 3/36C09D 7/68D21H 19/385C09C 1/021C09C 1/3661C01P 2004/32C09C 1/022C01P 2004/62C08K 9/12
50
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

The present invention provides methods and compositions comprising inorganic solids for use as pigments in paints, papers and plastics.

Claims

exact text as granted — not AI-modified
1 . A pigment composition comprising one or more inorganic base particles and one or more substantially spherical shaped spacer particles deposited thereon, the pigment composition having a particle size range between about 0.1 and about 0.5 microns.  
     
     
         2 . A pigment composition according to  claim 1 , wherein the base particles are anatase or rutile titanium dioxide.  
     
     
         3 . A pigment composition according to  claim 2 , wherein the substantially spherical shaped spacer particles are calcium carbonate, silica, alumina, zirconia, titania or combinations thereof.  
     
     
         4 . A pigment composition according to  claim 3 , further comprising a surfactant.  
     
     
         5 . A pigment composition according to  claim 4 , wherein the surfactant is selected from the group consisting of polyacrylic acid homopolymers, polyacrylic acid copolymers, and mixtures thereof.  
     
     
         6 . A pigment composition according to  claim 5 , wherein the surfactant comprises a polyacrylic acid homopolymer or copolymer comprising at least one comonomer selected from the group consisting of maleic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, acrylamide, acrylonitrile, ethylene, propylene, styrene and esters of the acids, wherein the homopolymer or copolymer has been partially or completely neutralized with a neutralizing agent having a monovalent group.  
     
     
         7 . A pigment composition according to  claim 4 , wherein the surfactant is a phosphate compound selected from the group consisting of tetrapotassium pyrophosphate, sodium polyphosphate, tetrasodium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, phosphoric acid, and mixtures thereof.  
     
     
         8 . A pigment composition according to  claim 4 , wherein the pigment composition has spacer particles having a particle size range between about 0.005 and about 1 micron.  
     
     
         9 . A pigment composition according to  claim 4 , wherein the spacer particles are silica and have a particle size range between about 5 and about 50 nanometers.  
     
     
         10 . A pigment composition according to  claim 4 , wherein the spacer particles are calcium carbonate and have a particle size range between about 0.1 and about 1 microns.  
     
     
         11 . (canceled)  
     
     
         12 . (canceled)  
     
     
         13 . An inorganic composition comprising one or more substantially spherical shaped calcium carbonate particles, the particles having a size range between about 0.1 and about 1 micron.  
     
     
         14 . A method of preparing pigment particles comprising the steps of: 
 (a) preparing an aqueous slurry of base pigment particles;    (b) adding a surfactant and one or more spacer precursors to the slurry; and    (c) precipitating the one or more spacer precursors on the base pigment particles under conditions so as to form substantially spherical shaped spacer particles on the base pigment particles, the base pigment particles having a particle size range between about 0.1 and about 0.5 microns.    
     
     
         15 . A method according to  claim 14 , wherein the base pigment particles are anatase or rutile titanium dioxide.  
     
     
         16 . A method according to  claim 14 , wherein the spacer particles are calcium carbonate, silica, alumina, zirconia, titania or combinations thereof.  
     
     
         17 . A method according to  claim 14 , wherein the surfactant is selected from the group consisting of polyacrylic\acid homopolymers, polyacrylic acid copolymers, and mixtures thereof.  
     
     
         18 . A method according to  claim 14 , wherein the surfactant comprises a polyacrylic acid homopolymer or copolymer comprising at least one comonomer selected from the group consisting of maleic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, acrylamide, acrylonitrile, ethylene, propylene, styrene and esters of the acids, wherein the homopolymer or copolymer has been partially or completely neutralized with a neutralizing agent having a monovalent group.  
     
     
         19 . A method according to  claim 14 , wherein the surfactant is a phosphate compound selected from the group consisting of tetrapotassium pyrophosphate, sodium polyphosphate, tetrasodium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, phosphoric acid, and mixtures thereof.  
     
     
         20 . A method according to  claim 14 , wherein the substantially spherical shaped spacer particles has a particle size range between about 0.005 and about 1 micron.  
     
     
         21 . A method according to  claim 14 , wherein the substantially spherical shaped spacer particles has a particle size range between about 5 nanometers to about 50 nanometers.  
     
     
         22 . A method according to  claim 14 , wherein the substantially spherical shaped spacer particles has a particle size range between about 0.1 and about 1 micron.  
     
     
         23 . (canceled)  
     
     
         24 . (canceled)  
     
     
         25 . A pigment composition comprising one or more titanium dioxide base particles, one or more substantially spherical shaped silica particles deposited thereon and a surfactant, the pigment composition having a particle size range between about 0.1 and about 0.5 microns.  
     
     
         26 . A pigment composition according to  claim 25 , wherein the base particles are anatase or rutile titanium dioxide.  
     
     
         27 . A pigment composition according to  claim 25 , wherein the silica particles are hydrous silica.  
     
     
         28 . A pigment composition according to  claim 25 , wherein the surfactant is a phosphate compound.  
     
     
         29 . A pigment composition according to  claim 28 , wherein the phosphate compound is tetrapotassium pyrophosphate, sodium polyphosphate, tetrasodium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, phosphoric acid, and mixtures thereof.  
     
     
         30 . (canceled)  
     
     
         31 . (canceled)  
     
     
         32 . (canceled)  
     
     
         33 . (canceled)  
     
     
         34 . A method of preparing pigment particles comprising the steps of: 
 (a) preparing an aqueous slurry of base titanium dioxide pigment particles;    (b) adding a surfactant and one or more silica spacer precursors to the slurry; and    (c) precipitating the one or more silica spacer precursors on the base pigment particles under conditions so as to form substantially spherical shaped silica spacer particles on the base pigment particles, the base pigment particles having a particle size range between about 0.1 and about 0.5 microns.    
     
     
         35 . A method according to  claim 34 , wherein the base pigment particles are anatase or rutile titanium dioxide.  
     
     
         36 . A method according to  claim 34 , wherein the silica spacer particles are hydrous silica.  
     
     
         37 . A method according to  claim 34 , wherein the surfactant is selected from the group consisting of polyacrylic acid homopolymers, polyacrylic acid copolymers, and mixtures thereof.  
     
     
         38 . A method according to  claim 37 , wherein the surfactant comprises a polyacrylic acid homopolymer or copolymer comprising at least one comonomer selected from the group consisting of maleic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, acrylamide, acrylonitrile, ethylene, propylene, styrene and esters of the acids, wherein the homopolymer or copolymer has been partially or completely neutralized with a neutralizing agent having a monovalent group.  
     
     
         39 . A method according to  claim 34 , wherein the surfactant is a phosphate compound selected from the group consisting of tetrapotassium pyrophosphate, sodium polyphosphate, tetrasodium pyrophosphate, sodium tripolyphosphate, potassium tripolyphosphate, sodium hexametaphosphate, phosphoric acid, and mixtures thereof.  
     
     
         40 . A method according to  claim 34 , wherein the substantially spherical shaped silica spacer particles have a particle size range between about 5 and about 50 nanometers.  
     
     
         41 . A paint, plastic or paper comprising the pigment according to  claim 1 .  
     
     
         42 . (canceled)  
     
     
         43 . A paint, plastic or paper comprising the pigment according to  claim 25 .  
     
     
         44 . A paint, plastic or paper comprising the pigment made by the method according to  claim 14 .  
     
     
         45 . (canceled)  
     
     
         46 . A paint, plastic or paper comprising the pigment made by the method according to  claim 34 .  
     
     
         47 . (canceled)  
     
     
         48 . A paint, plastic or paper comprising the composition according to  claim 13.

Join the waitlist — get patent alerts

Track US2004202601A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.