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Hollow/porous fibers and applications thereof

A fiber and blend technology, which is applied to hollow/porous fibers and their application fields, can solve the problems of difficult production of fibers, and achieve the effect of improving the ability of decomposition and improving efficiency.

Active Publication Date: 2010-12-15
PHILIP MORRIS PROD SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fibers are difficult to produce consistently and economically

Method used

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  • Hollow/porous fibers and applications thereof
  • Hollow/porous fibers and applications thereof
  • Hollow/porous fibers and applications thereof

Examples

Experimental program
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preparation example Construction

[0043] In another embodiment, there is provided a method for preparing a fiber described herein, comprising:

[0044] (a) adding polyvinyl acetate to polyacrylic acid to form a spinning mixture; and

[0045] (b) passing the spinning mixture directly through a die or spinneret to form fibers.

[0046] The die or spinneret used to form the fibers may have an annular configuration. For example, a spinneret having an annular orifice or hole through which the liquefied spinning mixture is passed under pressure can be used to form the walls of the hollow fiber structures described herein. In a specific embodiment, a coaxial central port in the spinneret can be used to introduce material to fill the core or lumen of the fiber with a target material, usually gas or liquid, that serves to expand the core of the fiber and Prevent it from flattening during spinning. Such a die or spinneret may be placed at the outlet of a conventional compounder or extruder, such as a twin screw extru...

Embodiment 1

[0055] In a microblender, 1 gram of polyvinyl acetate was added to 1 gram of polyacrylic acid and heated and blended for 2 minutes at a temperature of 150° C. and a blending speed of 100 rpm. The resulting polymer melt was drawn directly from the die of the microblender and spun into fibers using a spin line and a spool with a take-up speed of 5 m / min. The obtained fibers were photographed under transmitted polarized light using an Olympus BX60 Petrographic optical microscope. Figure 4 A cross-section of the fiber is shown, and the microcellular structure of the fiber is also shown. A longitudinal view of the fiber is shown in Figure 2D middle.

Embodiment 2

[0057] A similar procedure to Example 1 was followed except varying the amount of each polymer added to the microblender to obtain a blend and fiber with 60 wt% polyvinyl acetate, 40 wt% polyacrylic acid. The melt-spun fibers were photographed as described in Example 1, and the resulting images are shown in Figure 5 with 6 middle. The microcellular nature of the fibers is clearly visible.

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Abstract

In one embodiment is provided a polymer blend of poly(vinyl acetate) (PVAc) and poly(acrylic acid) (PAA), wherein the poly(vinylacetate) is present in an amount ranging between about 20 wt% and about 80 wt%, and poly(acrylic acid) is present in an amount ranging between about 80 wt% and about 20 wt%, based on the total weight of the blend. In another embodiment is provided a fiber produced from this polymer blend, and which has cells therein. In another embodiment is provided a flavorant release material comprising the porous fiber disclosed herein, and one or more flavorants disposed in a longitudinally extending core within the fiber. In another embodiment is provided a polymer fiber membrane containing a hollow, porous fiber formed from the polymer blend disclosed herein. In another embodiment is provided a filter containing the fiber described herein. In another embodiment is provided a process for producing the fibers disclosed herein by addition of the polymers to an extruder or blender, and extruding or melt spinning the mixture into a fiber containing cells therein.

Description

Background technique [0001] Hollow and / or porous fibers and porous membranes can be used in different applications such as filtration, controlled release, membrane separation, analytical science, food industry, and pharmaceutical industry, environmental or green industry and medical industry. However, these fibers are difficult to produce consistently and economically. There remains a need for hollow and / or porous polymeric fibers, and polymeric compositions and methods of producing them, wherein the fibers have controllable diameter and strength and are simple and economical to produce. Contents of the invention [0002] In one embodiment, there is provided a polymer blend of polyvinyl acetate (PVAc) and polyacrylic acid (PAA), wherein the polyvinyl acetate is present in an amount between about 20 wt. % and about 80 wt. The amount is between about 80 wt% to about 20 wt%, based on the total weight of the blend. [0003] In another embodiment, there is provided a fiber prod...

Claims

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Application Information

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IPC IPC(8): C08L31/04C08L33/02D01F6/52A24D1/00B01D24/00A24D3/00
CPCC08L33/02D01F6/52B01D71/38B01D69/082A24D3/065A24D3/08A24D3/0204B01D2325/025A24D3/14C08L33/08C08L31/04B01D69/08Y10T428/2975Y10T428/2933Y10T428/2973A24D3/048A24D3/063A24D1/00C08L2666/04B01D71/383B01D2325/0283B01D67/002B01D69/081C08L2203/12D10B2505/04
Inventor M·K·米什拉H·L·于
Owner PHILIP MORRIS PROD SA
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