To obtain a new filler which has strength development ability caused by a specific silanol group and a low bulk specific gravity and paper which is packed with the filler and has a low density and high paper strength.
The new filler for papermaking is a calcium silicate or silica-based filler for papermaking, which contains at least one kind of a silanol group among silanol groups of Q0, Q1 and Q2, has the ratio ((S0+S1+S2)/Sall) of the sum (S0+S1+S2) of the peak area by the silanol groups Q0, Q1 and Q2 to the all peak areas (Sall) derived from the silanol groups of 0.5-1 in a 29Si-solid NMR (nuclear magnetic resonance apparatus) chart by a CP/MAS method and is made to have a specified bulk specific gravity. The paper having a higher bulk and less reduction in paper strength than paper packed with a conventional filler is obtained by packing the new filler to paper.
KONNO HARUO
OCHI TAKASHI
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