Patent ID: 9365696
Filing Date: 2016-06-14
CPC Classification: C01F,C08K,C09K

Claim Text:
1. A powdery mineral filler comprising a calcium compound and a magnesium compound, characterized in that said mineral filler comprises a semi-hydrated dolomite fitting the general formula aCaCO 3 .bCa(OH) 2 .cMg(OH) 2 .dMgO.eCaO, a, b, c, d and e being molar fractions with (a+b+e)/(c+d) being comprised between 0.8 and 1.2 and having values such that b represents the molar fraction corresponding to a weight proportion ≧15%, c represents the molar fraction corresponding to a weight proportion ≧1%, d represents the molar fraction corresponding to a weight proportion ≧1%, a and e respectively representing molar fractions corresponding to weight proportions being both ≧0%, said weight proportions being given based on the total weight of said semi-hydrated dolomite and in that said mineral filler comprises agglomerates of aggregates of particles, said aggregates of particles having a d 97 <30 μm, a d 90 <15 μm, a d 50 <5 μm, and a d 3 >0.3 μm, after suspension in methanol.