Coating processes – Particles – flakes – or granules coated or encapsulated – Resin base
Patent
1975-11-28
1977-04-19
Hoffman, James R.
Coating processes
Particles, flakes, or granules coated or encapsulated
Resin base
427242, B05D 118, B05D 702
Patent
active
040189465
ABSTRACT:
Methods for producing expandable discrete styrene-polymer bit-pieces impregnated with a liquid aliphatic impregnant which volatizes below said polymer's softening point are disclosed. Specifically, the disclosed methods include mixing a quantity of the styrene-polymer bit-pieces in an aqueous solution with a sufficient quantity of the aliphatic impregnant to provide the planned extent of impregnation and a quantity of a compatible water-soluble emulsifying agent sufficient to emulsify that quantity of impregnant in the aqueous solution. Furthermore, methods for producing such expandable discrete sytrene-polymer bit-pieces including mixing the bit-pieces with the required amount of aliphatic impregnant in a hermetically sealed impregnant chamber free of moving parts, and rotating the sealed impregnator at a speed sufficient to maintain the bit-pieces in agitation while heating the aqueous solution by indirect heat exchange are also disclosed.
In addition, the improved styrene-polymer bit-pieces produced by this method are also disclosed, having extended shelf lives, improved densities, and substantially uniformly-sized mixed pentagonal and hexagonal cells.
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Hoffman James R.
Sealed Air Corporation
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