Method for preparing magnetic coating compositions

Details Method for preparing magnetic coating compositions Method for preparing magnetic coating compositions

1989-12-29

1990-08-28

Jenkins, Robert W.

Agitating

Rubber or heavy plastic working

With specified feed means

366 97, 366301, B28C 704, B01F 702

Patent

active

049520644

ABSTRACT:
A single two-shaft continuous kneading and mixing machine, which is provided with a pair of shafts having blade members secured thereto, and a barrel accommodating the shafts such that they can be rotated, carries out kneading of a mixture of magnetic grains and a solution, which contains a binder in an organic solvent, in a normal kneading region and thereafter carries out dilution kneading of the mixture, which resulted after kneading in the normal kneading region was carried out, and an organic solvent in a dilution kneading region. The solids concentration in the mixture subjected to kneading in the normal kneading region is adjusted so that it falls within the range of 65 to 95 wt %. The solids concentration in the mixture subjected to dilution kneading is adjusted so that it falls within the range of 30 to 60 wt %. The width of a gap between blade members, which are secured to different shafts and which face each other, and the width of a gap between each blade member and the inner surface of the barrel in the dilution kneading region are made smaller than the widths of corresponding gaps in the normal kneading region.

REFERENCES:
patent: 2670188 (1954-02-01), Erdmenger
patent: 4343929 (1982-08-01), Sugio

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