Purging agent

Details Purging agent Purging agent

1997-04-09

1999-09-28

Michl, Paul R.

Plastic and nonmetallic article shaping or treating: processes

With step of cleaning, polishing, or preconditioning...

2641761, B28B 704

Patent

active

059583134

ABSTRACT:
A purging agent for purging the resin to be purged from an extruder in a melt extrusion apparatus is provided which comprises (A) a hydrophobic thermoplastic resin, (B) a hydrophilic thermoplastic resin and (C) a purging auxiliary selected from the group consisting of (C1) a plasticizer for the resin to be purged, (C2) water and (C3) a crystal water-containing compound, the proportions of the hydrophobic thermoplastic resin (A) and hydrophilic thermoplastic resin (B) being 100/0 to 30/70 by weight and the proportion of the purging auxiliary (C) relative to 100 weight parts of the sum total of the hydrophobic thermoplastic resin (A) plus hydrophilic thermoplastic resin (B) being 0.01 to 40 weight parts.

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