What is claimed is:
1. A thermosensitive stencil paper comprising a thermoplastic resin film and a porous resin layer which is provided on said thermoplastic resin film by coating a porous resin layer formation coating liquid comprising a water-in-oil emulsion of a resin on said thermoplastic resin film and drying said coating liquid.
2. The thermosensitive stencil paper as claimed in claim 1, wherein said water-in-oil emulsion is prepared by use of an emulsifier.
3. The thermosensitive stencil paper as claimed in claim 1, wherein said resin for use in said water-in-oil emulsion comprises a thermoplastic resin.
4. The thermosensitive stencil paper as claimed in claim 3, wherein said thermoplastic resin is a polyurethane resin.
5. The thermosensitive stencil paper as claimed in claim 3, wherein said thermoplastic resin is a polyvinyl butyral resin.
6. The thermosensitive stencil paper as claimed in claim 1, wherein said porous resin layer has pores with a diameter of 5 m or more therein, with said pores occupying an area of 4 to 80% of the entire surface area of said porous resin layer, provided that the pore diameter is obtained by converting the form of a pore into a true round.
7. The thermosensitive stencil paper as claimed in claim 1, wherein said thermoplastic resin film exhibits a permeability of 1.0 to 157 cm3cm2sec when perforations are made in said thermoplastic resin film corresponding to a solid image portion so that said perforations may occupy an area of 40% or more of the total area of said solid image portion.
8. The thermosensitive stencil paper as claimed in claim 1, wherein said porous resin layer formation coating liquid further comprises a filler.
9. The thermosensitive stencil paper as claimed in claim 1, wherein said thermosensitive stencil paper exhibits a bending rigidity of 5 mN or more.
10. The thermosensitive stencil paper as claimed in claim 4, wherein said water-in-oil emulsion of said polyurethane resin is prepared in such a manner that finely-divided particles are dispersed in a solution of said polyurethane resin to prepare a dispersion, said finely-divided particles being produced by allowing an active hydrogen containing polyfunctional compound to react with an organic polyisocyanate, and said dispersion is prepared into said water-in-oil emulsion using an emulsifier.
11. A method of producing a thermosensitive stencil paper comprising a thermoplastic resin film and a porous resin layer provided thereon, comprising the steps of coating on said thermoplastic resin film a porous resin layer formation coating liquid comprising a water-in-oil emulsion of a resin, and drying said coating liquid, thereby providing said porous resin layer on said thermoplastic resin film.
12. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said porous resin layer formation coating liquid is prepared in such a manner that said resin and an emulsifier are dissolved in a good solvent with respect to said resin to prepare a resin solution, and a non-solvent with respect to said resin is added dropwise to said resin solution with stirring to prepare said water-in-oil emulsion of said resin.
13. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said porous resin layer formation coating liquid is prepared in such a manner that said resin is dissolved in a good solvent with respect to said resin to prepare a resin solution, and a non-solvent with respect to said resin which comprises an emulsifier is added dropwise to said resin solution with stirring to prepare said water-in-oil emulsion of said resin.
14. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said resin for use in said water-in-oil emulsion comprises a thermoplastic resin.
15. The method of producing a thermosensitive stencil paper as claimed in claim 14, wherein said thermoplastic resin is a polyurethane resin.
16. The method of producing a thermosensitive stencil paper as claimed in claim 14, wherein said thermoplastic resin is a polyvinyl butyral resin.
17. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said porous resin layer has pores with a diameter of 5 m or more therein, with said pores occupying an area of 4 to 80% of the entire surface area of said porous resin layer, provided that the pore diameter is obtained by converting the form of a pore into a true round.
18. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said thermoplastic resin film exhibits a permeability of 1.0 to 157 cm3cm2 sec when perforations are made in said thermoplastic resin film corresponding to a solid image portion so that said perforations may occupy an area of 40% or more of the total area of said solid image portion.
19. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said porous resin layer formation coating liquid further comprises a filler.
20. The method of producing a thermosensitive stencil paper as claimed in claim 11, wherein said thermosensitive stencil paper exhibits a bending rigidity of 5 mN or more.
21. The thermosensitive stencil paper as claimed in claim 15, wherein said water-in-oil emulsion of said polyurethane resin is prepared in such a manner that finely-divided particles are dispersed in a solution of said polyurethane resin to prepare a dispersion, said finely-divided particles being produced by allowing an active hydrogen containing polyfunctional compound to react with an organic polyisocyanate, and said dispersion is prepared into said water-in-oil emulsion using an emulsifier.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A fiber comprising a polyamide polymer, the fiber comprising a diameter of about 0.001 to about 5 microns; wherein the polyamide comprises a block copolymer comprising nylon-b-alkylene oxide polymer blocks, the alkylene oxide blocks comprising one or more alkylene oxide monomers and the nylon polymer blocks comprising one or more nylon monomers.
2. The fiber of claim 1 wherein the alkylene oxide block can comprise ethylene oxide, propylene oxide, tetramethylene oxide, or mixtures thereof.
3. The fiber of claim 1 wherein the nylon block can comprise a residue derived from a cyclic lactam, an alpha omega alkylene diamine, an aromatic diamine or an alpha omega alkylene diacid, and an aromatic diacid.
4. The fiber of claim 1 where the polyamide block comprises N-modified blocks.
5. The fibers of claim 4 where, where the N-modified group comprises N-hydroxyalkyl, N-alkoxyalkyl, N-allyloxyalkyl, N-allyl, N-alkyl, or mixtures thereof.
6. The fiber of claim 1 wherein the diameter of the fiber is about 0.01 to about 2 microns.
7. The fiber of claim 1 where the fiber is crosslinked.
8. A fiber comprising a polyamide polymer, the fiber comprising a diameter of about 0.001 to about 5 microns; wherein the polyamide comprises a nylon copolymer comprising a bis-(amino substituted cycloalkyl)-alkane.
9. The fiber of claim 16 wherein the bis-(amino substituted cycloalkyl)-alkane comprises a bis-(4-aminocyclohexyl)-methane, such as the compound:
and at least one other nylon monomer.
10. The fiber of claim 16 wherein the bis-(amino substituted cycloalkyl)-alkane comprises the compound:
and at least one other nylon monomer.
11. The fiber of claim 16 wherein the nylon comprises a polyamide comprising adipic acid, \u03b5-caprolactam, hexamethylene diamine and bis(4-aminocyclohexyl)methane.
12. The fiber of claim 16 where the fiber is crosslinked.
13. The fibers of claim 16 where, where the nylon comprises a N-modified group comprises N-hydroxyalkyl, N-alkoxyalkyl, N-allyloxyalkyl, N-allyl, N-alkyl, or mixtures thereof.
14. The fiber of claim 16 wherein the nylon comprises an alkylol or an alkoxyalkyl modified nylon.
15. A filter medium comprising a layer of fiber and a filter substrate, the fiber comprising a polyamide polymer of claim 1.
16. A filter medium comprising a layer of fiber and a filter substrate, the fiber comprising a polyamide polymer, the fiber comprising a polymer of claim 8
17. A method of filtering comprising passing a fluid stream having entrained particulate through a filter comprising the filter medium of claim 15 and removing the particulate.
18. A method of filtering comprising passing a fluid stream having entrained particulate through a filter comprising the filter medium of claim 16 and removing the particulate.