Aluminum phosphate or polyphosphate compositions

Abstract

Slurry composition comprising amorphous aluminum phosphate, polyphosphate orthophosphate, metaphosphate and/or combination thereof and a dispersant are described. In certain embodiments, the polyphosphate orthophosphate and/or metaphosphate concentration is about 40 to about 70 weight % and the dispersant concentration is less than about 3.5 weight % based on the total weight of the slurry. In one embodiment, the composition is useful is paints, varnishes, printing inks, papers and plastics. The compositions can be used as a substitute for titanium dioxide in various applications.

1 - 35 . (canceled) 
     
     
         36 . A slurry comprising amorphous aluminum phosphate particles and a dispersant, wherein the aluminum phosphate concentration is about 40 to about 70 weight % and the dispersant concentration is from about 0.1 to 3.5 weight % based on total weight of the slurry, and wherein the dispersant is selected from the group consisting of tetrasodium pyrophosphate, pentasodium triphosphate, trisodium phosphate dodecahydrate, tetrapotassium pyrophosphate, sodium potassium triphosphate, a borate dispersant, a silicate dispersant, and combinations thereof. 
     
     
         37 . The slurry as recited in  claim 36 , wherein the dispersant concentration is less than about 2 weight % based on the total weight of the slurry. 
     
     
         38 . The slurry as recited in  claim 36 , wherein the dispersant concentration is less than about 1 weight % based on the total weight of the slurry. 
     
     
         39 . The slurry as recited in  claim 36 , wherein the dispersant concentration is about 0.1 to about 1 weight % based on the total weight of the slurry. 
     
     
         40 . The slurry as recited in  claim 36 , wherein the dispersant concentration is about 0.25 to about 1 weight % based on the total weight of the slurry. 
     
     
         41 . The slurry as recited in  claim 36 , wherein the dispersant concentration is about 0.25, 0.5, 0.75 or 1 weight % based on the total weight of the slurry. 
     
     
         42 . The slurry as recited in  claim 36 , wherein the aluminum phosphate concentration is about 50 to about 60 weight % based on the total weight of the slurry. 
     
     
         43 . The slurry as recited  claim 36 , wherein the aluminum phosphate concentration is about 50, 51, 52, 53, 54, 55 or 56 weight % based on the total weight of the slurry. 
     
     
         44 . The slurry as recited in  claim 36  wherein the slurry has a viscosity of from about 300 cPs to about 3,500 cPs measured from 100 s −1  to 500 s −1  shear rates. 
     
     
         45 . The slurry as recited in  claim 36 , wherein the dispersant is selected from the group consisting of tetrasodium pyrophosphate, pentasodium triphosphate, trisodium phosphate dodecahydrate, tetrapotassium pyrophosphate, sodium potassium triphosphate. 
     
     
         46 . The slurry as recited in  claim 45  wherein the wherein the aluminum phosphate concentration is about 51 weight % based on the total weight of the slurry, and the slurry has a viscosity of approximately 576 cPs to 2,774 cPs at 100 s −1 , 462 cPs to 1,396 cPs at 300 s −1 , and 376 cPs to 1,097 cPs at 500 s −1 . 
     
     
         47 . The slurry as recited in  claim 45 , wherein the aluminum phosphate concentration is about 51 weight % based on the total weight of the slurry, the dispersant is pentasodium triphosphate, and the slurry has a viscosity from about 576 cPs to 1,963 cPs measured at 100 s −1 . 
     
     
         48 . The slurry as recited in  claim 45 , wherein the aluminum phosphate concentration is about 51 weight % based on the total weight of the slurry, the dispersant is pentasodium triphosphate, and the slurry has a viscosity from about 462 cPs to 1,174 cPs measured at 300 s −1 . 
     
     
         49 . The slurry as recited in  claim 45 , wherein the aluminum phosphate concentration is about 51 weight % based on the total weight of the slurry, the dispersant is pentasodium triphosphate, and the slurry has viscosity from about 376 cPs to 966 cPs measured at 500 s −1 . 
     
     
         50 . The slurry as recited in  claim 45  that is substantially free of titanium dioxide. 
     
     
         51 . A coating composition comprising the slurry as recited in  claim 36  as combined with a binding polymer. 
     
     
         52 . A slurry as recited in  claim 36  wherein the slurry comprises greater than 51 weight % of the amorphous aluminum phosphate, and wherein the dispersant is pentasodium triphosphate. 
     
     
         53 . A slurry as recited in  claim 52  wherein the slurry comprises 53.85 to 55.71 weight % of the amorphous aluminum phosphate. 
     
     
         54 . The slurry as recited in  claim 52  wherein the dispersant concentration is between 0.98 to 1.51 weight %, and wherein the slurry and has a viscosity of from 1,308 cPs to 5,623 at 100 s −1 . 
     
     
         55 . The slurry as recited in  claim 52  wherein the dispersant concentration is between 0.98 to 1.51 weight %, and wherein the slurry has a viscosity of from about 914 to 2,405 cPs at 300 s −1 . 
     
     
         56 . The slurry as recited in  claim 52  wherein the dispersant concentration is between 0.98 to 1.51 weight %, and wherein the slurry has a viscosity of from about 757 to 1,687 cPs at 500 s −1 . 
     
     
         57 . A slurry comprising an opacifying pigment formed of amorphous aluminum phosphate particles and a dispersant, wherein the dispersant is selected from the group consisting of a borate dispersant, a silicate dispersant, and combinations thereof. 
     
     
         58 . A slurry comprising an opacifying pigment formed of amorphous aluminum phosphate particles and a dispersant that is pentasodium triphosphate. 
     
     
         59 . A method for making a stable aluminum phosphate slurry composition comprising:
 a) mixing amorphous aluminum phosphate particles with a dispersant selected from the group consisting of tetrasodium pyrophosphate, pentasodium triphosphate, trisodium phosphate dodecahydrate, tetrapotassium pyrophosphate, sodium potassium triphosphate, a borate dispersant, a silicate dispersant, and combinations thereof; and   b) stirring with a disperser at stirring velocity of 500 to 2,000 rpm.   
     
     
         60 . The method as recited in  claim 59  wherein the aluminum phosphate concentration is about 40 to about 70 weight %, and the dispersant concentration is from about 0.1 to 3.5 weight % based on total weight of the slurry. 
     
     
         61 . The method as recited in  claim 59  wherein the slurry has a viscosity of from about 300 cPs to about 3,500 cPs measured from 100 s −1  to 500 s −1  shear rates. 
     
     
         62 . The method as recited in  claim 59  wherein during the step of mixing, a stock slurry comprising about 30 weight % amorphous aluminum phosphate based on total weight of the slurry is combined with the amorphous aluminum particles and the dispersant. 
     
     
         63 . The method as recited in  claim 59  wherein the amorphous aluminum orthophosphate concentration is about 51 weight % based on the total weight of the slurry, and wherein the dispersants are selected from the group consisting of tetrasodium pyrophosphate, pentasodium triphosphate, trisodium phosphate dodecahydrate, tetrapotassium pyrophosphate, sodium potassium triphosphate. 
     
     
         64 . The method as recited in  claim 63  wherein the slurry has a viscosity of approximately 576 cPs to 2,774 cPs at 100 s −1 , 462 cPs to 1,396 cPs at 300 s −1 , and 376 cPs to 1,097 cPs at 500 s −1 . 
     
     
         65 . A method for making a coating composition comprising combining the slurry as made according to  claim 59  and combining the slurry with a binder polymer.