摘要:
Polyglutarimides exhibit improved optical properties, as well as lowered content of non-aqueous volatiles, when the molten polyglutarimide is mixed with water, methanol and/or ethanol which is then removed prior to isolation and processing of the polyglutarimide.
摘要:
An extruder wherein the extruder bores are non-communicating with one another for at least a portion of the length of the extruder bores and a process employing the same.
摘要:
A process for producing a cured composite, preferably a light pipe, comprising the steps of:
a) concurrently and coaxially extruding:
i.) a molten cladding polymer through an annular channel (2) of a coextrusion die to form an extruded tubular cladding, and ii.) a crosslinkable core mixture through a core mixture delivery tube (6) of the coextrusion die to form an extruded crosslinkable core mixture within the circumference of the extruded tubular cladding;
b) filling and contacting the extruded tubular cladding with the extruded crosslinkable core mixture; and subsequently c) curing the crosslinkable core mixture within the tubular cladding.
摘要:
A hand-held device for severing flexible polymeric tube, pipe, or tubular extrudate, especially flexible light pipe, reproducibly and cleanly is described. The device comprises a block (14) with holes (20) or openings for holding the pipe and a slit for guiding the severing blade with minimum deviation from its path. An improved design employs a pivot in the block upon which a notched blade in a holder (12) may be mounted to give even more accurate and uniform control of the severing process.
摘要:
An extruder wherein the extruder bores are non-communicating with one another for at least a portion of the length of the extruder bores and a process employing the same.
摘要:
The residence time distribution of materials in an extruder can modified to give a residence time distribution comparable to that obtained in a continuous stirred tank reactor by providing in the extruder a section having non intermeshing counter-rotating twin screws with flights having the same directional pitch.
摘要:
A continuous process for preparing polymers is provided: The continuous process produces polymers from monoethylenically unsaturated acids or anhydrides, and a nitrogen-containing compound, optionally in the presence of a fluidizing agent. The polymers are useful as detergent additives, pigment and mineral dispersants, additives for fertilizers, and corrosion and scale inhibitors in boilers and cooling towers.