Polyvinyl alcohol-based hollow fiber membrane and process for producing the same
First Claim
1. A process for producing a polyvinyl alcohol-based hollow fiber membrane, which comprises forming said polyvinyl alcohol-based hollow fiber membrane by dry-jet wet spinning or wet spinning of a spinning dope with a spinneret having a heat insulated structure, thereby preventing said spinning dope from undergoing partial phase separation by cooling in the spinneret.
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Abstract
A polyvinyl alcohol-based hollow fiber membrane having a ratio between the size of particles of 90% rejection and that of particles of 10% rejection of not more than 5, thus proving to have a sharp fractionating property, is produced by a process which comprises, on producing a polyvinyl alcohol-based hollow fiber membrane by dry-jet wet spinning or wet spinning, using a spinneret having heat insulating structure.
28 Citations
17 Claims
- 1. A process for producing a polyvinyl alcohol-based hollow fiber membrane, which comprises forming said polyvinyl alcohol-based hollow fiber membrane by dry-jet wet spinning or wet spinning of a spinning dope with a spinneret having a heat insulated structure, thereby preventing said spinning dope from undergoing partial phase separation by cooling in the spinneret.
Specification