Dl920

Example 19

139 g of Carbopaque 90 (=100 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 16 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 8 parts latex per hundred of calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 12% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.6 using NaOH. A second colour was prepared using an increased latex dose of 10 pph.

Example 17

129 g of Carbital 60HS (=100 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 14 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 7 parts latex per hundred of calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 12% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.7 using NaOH. A second colour was prepared using an increased latex dose of 9 pph.

Example 21

173.4 g of the product prepared according to Ex 14 (=103 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 14 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 7 parts latex per hundred of dry calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 10% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.8 using NaOH. A second colour was prepared using an increased latex dose of 9 pph.

Example 20

129.7 g of Carbital 90HS (=00 g dry) were weighed into a beaker, and 2.5 g of a commercially available powdered cellulose of 1000 nm average particle size (manufacturers value) intended for paper coating (Arbocel MF40, J. Rettenmaier & Söhne, Holzmühle, Germany), was added with mixing using a laboratory stirrer. When the powder had been fully dispersed, 15 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) was added to give a binder dose of 7.5 parts latex per hundred of calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 12% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.6 using NaOH.

Example 17

129 g of Carbital 60HS (=100 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 14 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 7 parts latex per hundred of calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 12% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.7 using NaOH. A second colour was prepared using an increased latex dose of 9 pph.

Example 17

129 g of Carbital 60HS (=100 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 14 g of a 50% suspension of styrene-butadiene-acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 7 parts latex per hundred of calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 12% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.7 using NaOH. A second colour was prepared using an increased latex dose of 9 pph.

Example 21

173.4 g of the product prepared according to Ex 14 (=103 g dry) were weighed into a beaker, mixed using a laboratory stirrer, and 14 g of a 50% suspension of styrene—butadiene—acrylonitrile latex (DL920, Dow Chemical) added to give a binder dose of 7 parts latex per hundred of dry calcium carbonate (pph). 0.3 dry g of carboxymethyl cellulose (Finnfix 10, CP Kelco) was then added as a 10% solution, followed by 0.5 g of a solution of optical brightening agent (Blankophor P, Kemira). The pH was adjusted to 8.8 using NaOH. A second colour was prepared using an increased latex dose of 9 pph.