Patent ID: 9562328
Date: 2017-02-07
CPC Classifications: C08B,C08K,C08L,D21H

Claim:
1. A method for the production of a composite material comprising any one of a microfibrillated cellulose and a nanofibrillated cellulose, the method comprising the following steps: (i) providing a liquid suspension of the microfibrillated or nanofibrillated cellulose; wherein the solids content of the microfibrillated or nanofibrillated cellulose is over 2%, (ii) bringing said liquid suspension in contact with two or more additives, wherein said additives are allowed to react with each other, wherein said additives are calcium carbonate or precursors thereof, thereby forming a composite material suspension, wherein the composite comprises the microfibrillated or nanofibrillated cellulose and the calcium carbonate or the precursors thereof, and wherein said calcium carbonate is formed or precipitated onto fibers or fibrils of the microfibrillated or nanofibrillated cellulose; (iii) increasing the solid contents of said composite material suspension, thereby forming a high solid contents composite material suspension; (iv) drying said high solid contents composite material suspension, through a simultaneous heating and mixing operation, whereby a substantially dry composite product is formed.