Process for Manufacturing a Gypsum Slurry or a Gypsum Product with the Use of a Wax Powder, Products Obtained by the Process and use of the Wax Powder for Obtaining a Moisture-Resistant Gypsum Product

A process for manufacturing a gypsum slurry comprising:

• bringing together and mixing at least the following components:
• gypsum, water and a wax powder, wherein
• 0.1 to 10 wt.-% of the wax powder are contained in the gypsum slurry, relative to the mass of dry gypsum;
• the wax powder having
• a particle size below 500 μm,
• an average particle size d50 (number average) of below 300 μm;
• and
• the wax powder comprises the following wax composition:
• i. 70 to 95 wt.-% hydrocarbon wax,
• ii. 5 to 30 wt.-% of a polar wax,
• iii. 0 to 10 wt.-% hydrocarbon resins, and
• iv. 0.1 to 5 wt.-% of one or more components selected from the group consisting of one or more polyols, starches, sugars, polyvinylalcohols and its derivatives;
• and
• wherein
• wax composition has a dynamic viscosity at 100° C. of below 12 cP and
• the acid number of the wax composition is below 10 mg KOH/g.