Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-05-12
1984-02-28
Padgett, Benjamin R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
264142, 264143, 523324, C08C 400, B29H 110
Patent
active
044340702
ABSTRACT:
Granulate-form agglomerates of pulverulent rubber chemicals having a maximum primary grain size of 500 .mu.m , an active substance content of at least 90% by weight and an assessment (a) in the intermixing test of at the most 1.5, (b) in the dust proportion test of at the most 10, (c) in the fine material proportion test of at the most 5 and (d) in the falling test of at the most 70, as well as a process for its production characterized in that the pulverulent rubber chemicals of a maximum primary grain size of 500 .mu.m are mixed with a moistening agent and/or a lubricant and are supplied to a double shaft screw granulator with forced conveyance, in which the spacing between the nozzle plate and the vertically cut screw ends is between 0 and 1.6 mm, whereby the compression ratio K.sub.D is between 1:6 and 1:1.5 and the ratio of nozzle channel length to nozzle channel diameter is between 1 and 6, and whereby the specific granulation work is from 2 to 40 Wh/kg, the rubber chemicals are forced axially through a nozzle perforating plate, the issuing strands are severed or are allowed to break-off and are then dried.
REFERENCES:
patent: 3026273 (1962-03-01), Engles
patent: 3164563 (1965-01-01), Maxwell et al.
patent: 3577494 (1971-05-01), Chisholm et al.
patent: 4187067 (1980-02-01), Mizuno et al.
patent: 4189458 (1980-02-01), Jezl
Journal of Powder and Bulk Solids Technology, Band 4, No. 4, 1980, published Oct.-Dec. 1980, R. Friedrich: "Powder Compression with Co-Rotating Twin-Screw Extruders", pp. 27-32.
Arend G/u/ nter
Barnikel Carl-Dieter
Frauenkron G/u/ nter
Lindner Wolfgang
Bayer Aktiengesellschaft
Padgett Benjamin R.
Thexton Matthew A.
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