B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
117/45.3
B01J 13/02 (2006.01) C09C 1/42 (2006.01) C09C 3/10 (2006.01) D21H 17/69 (2006.01)
Patent
CA 1160514
ABSTRACT A filler for paper, card or board which has a good retention and consists of an inert core material and a hydrophilic coating, which consists of polyacrylamide having a molecular weight of 105 to or of a mixture of this polyacrylamide with a urea- formaldehyde condensation resin. The filler is pre- pared by suspending the inert core material in an aqueous solution of a polyacrylamide having a molecular weight of 10 to 10 or in an aqueous solution of such a poly- acrylamide and a urea-formaldehyde condensation resin, and drying this suspension by spray drying or in a-stream of hot air. This crosslinks the initially water- soluble polymer and forms coating, adhering to the core, which is insoluble in water but is hydrophilic and swells, and becomes tacky, in the presence of water.
378262
Greinecker Herbert
Stern Gerhard
Chemie Linz Aktiengesellschaft
Riches Mckenzie & Herbert Llp
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