US Patent 11313082 Sheet material comprising fiber and nano-microscale organic fibrillated filler and method of producing said sheet material

This invention relates to a sheet material comprising fiber and nano-microscale organic fibrillated filler, wherein the nano-microscale organic fibrillated filler comprises microfibrillated cellulose and starch granule in such a way that the microfibrillated cellulose is dispersed with starch granule, and the nano-microscale organic fibrillated filler has starch granule at least 15 wt %. Besides, this invention also relates to a method of producing said sheet material comprising fiber and nano-microscale organic filler, wherein the method comprises the steps of (i) preparing pulp suspension, (ii) preparing nano-microscale organic fibrillated filler, (iii) adding the nano-microscale organic fibrillated filler into the pulp suspension, (iv) forming sheet material by pressing, and (v) drying the sheet material, wherein the preparation step of nano-microscale organic fibrillated filler provides the nano-microscale organic fibrillated filler comprising microfibrillated cellulose and starch granule in such a way that the microfibrillated cellulose is dispersed with starch granule.