Porous hollow fiber
First Claim
1. In a porous hollow polypropylene fiber having a large number of micropores in its surrounding wall, the improvment in which walls of said pores are coated with an essentially water-insoluble polymer selected from the group consisting of, carboxymethylethylcellulose, hydroxypropylmethylcellulose acetate succinate and hydropropylmethylcellulose phthalate and.
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Abstract
The improvement in a porous hollow fiber having a large number of micropores in its surrounding wall, in which walls of said pores are coated with an essentially water-insoluble alkylcellulose derivative such as ethylcellulose, carboxymethylethylcellulose, hydroxypropylmethylcellulose acetate succinate or hydroxypropylmethylcellulose phthalate, or poly(2-hydroxyethyl methacrylate).
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Citations
7 Claims
- 1. In a porous hollow polypropylene fiber having a large number of micropores in its surrounding wall, the improvment in which walls of said pores are coated with an essentially water-insoluble polymer selected from the group consisting of, carboxymethylethylcellulose, hydroxypropylmethylcellulose acetate succinate and hydropropylmethylcellulose phthalate and.
Specification