Filler for paper, card or board, a process for its manufacture,

Details Filler for paper, card or board, a process for its manufacture, Filler for paper, card or board, a process for its manufacture,

1981-05-20

1983-09-20

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524425, 524445, 524447, 524510, 524555, 523205, 523206, 428407, C08L 6110, C08L 3326

Patent

active

044057440

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 10.sup.5 to 10.sup.7 or of a mixture of this polyacrylamide with a urea-formaldehyde condensation resin. The filler is prepared by suspending the inert core material in an aqueous solution of a polyacrylamide having a molecular weight of 10.sup.5 to 10.sup.7 or in an aqueous solution of such a polyacrylamide 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 a coating, adhering to the core, which is insoluble in water but is hydrophilic and swells, and becomes tacky, in the presence of water.

REFERENCES:
patent: 3190850 (1965-06-01), Burke, Jr.
patent: 4107126 (1978-04-01), Burke, Jr. et al.
patent: 4128528 (1978-12-01), Frisque et al.
patent: 4132561 (1979-01-01), Burke, Jr. et al.
patent: 4132562 (1979-01-01), Burke, Jr. et al.
patent: 4198471 (1980-04-01), Nelson
patent: 4276212 (1981-06-01), Khanna et al.

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