Title:
HIGH DIELECTRIC NON-WOVEN FABRICS AND THEIR SYNTHETIC PROCESS
Document Type and Number:
WIPO Patent Application WO/2001/020076
Kind Code:
A2
Abstract:
The present invention relates to high dielectric non-woven fabrics and their synthetic process. Particularly, the present invention relates to a process for preparing high dielectric non-woven fabrics comprising the steps of (a) mix-spinning polyvinylidene fluoride (PVDF) and polypropylene (PP) to prepare a fiber, (b) polarizing the fiber prepared in the step (a) to improve the dielectric constant of the fiber, and (c) manufacturing non-woven fabrics from the fiber having improved dielectric constant, prepared in the step (b), and non-woven fabrics prepared according to the mentioned process. The non-woven fabrics of the present invention have very improved static electricity retention properties compared to the dielectric non-woven fabrics of the prior art. Thus, when they are applied to an electrostatic filter or sweeper, they can be made into an electrostatic filter that has a longer life time and excellent filtration efficiency for micro-particles and ionic particles, or to a sweeper that has high static electricity retention property and longer life time.
Inventors:
LEE CHOONG-JOONG (KR)
CHUNG SOON-KYU (KR)
JOO JIN-SOO (KR)
CHUNG SOON-KYU (KR)
JOO JIN-SOO (KR)
Application Number:
PCT/KR2000/000975
Publication Date:
March 22, 2001
Filing Date:
August 30, 2000
Export Citation:
Assignee:
SHIN CHANG TECHNOLOGY INC (KR)
LEE CHOONG JOONG (KR)
CHUNG SOON KYU (KR)
JOO JIN SOO (KR)
LEE CHOONG JOONG (KR)
CHUNG SOON KYU (KR)
JOO JIN SOO (KR)
International Classes:
B01D39/14; B01D39/00; B01D39/16; B01J19/08; B03C3/28; D01D10/00; D01F6/46; D04H1/40; D04H1/42; D04H1/4291; D04H1/4318; D04H1/4334; D04H1/46; D04H3/16; D06M10/00; (IPC1-7): D21F/
Domestic Patent References:
| WO1996037276A1 | 1996-11-28 |
Foreign References:
| US5110620A | 1992-05-05 | |||
| US5877099A | 1999-03-02 | |||
| US5645627A | 1997-07-08 |
Attorney, Agent or Firm:
Kim, Won-ho (Teheran Building 825-33 Yoksam-dong Kangnam-ku
Seoul 135-080, KR)
Download PDF:
Claims:
WHAT IS CLAIMED IS:
| 1. | A process for preparing high dielectric nonwoven fabrics comprising the steps of (a) mixspinning polyvinylidene fluoride (PVDF) and polypropylene (PP) to prepare fiber; (b) polarizing the mentioned fiber prepared in the step (a) to enhance the dielectric constant of the fiber; and (c) manufacturing nonwoven fabrics from the fiber having an improved dielectric constant prepared in the step (b). |
| 2. | A process for preparing high dielectric nonwoven fabrics according to claim 1, wherein, in the step (a), the contents of polyvinylidene fluoride is 1 to 20 wt% by weight and the contents of polypropylene is 99 to 80 wt%. |
| 3. | A process for preparing high dielectric nonwoven fabrics according to claim 1, wherein the thickness of the fiber prepared in the step (a) is 5 to 20 hum. |
| 4. | A process for preparing high dielectric nonwoven fabrics according to claim 1, wherein the density of the nonwoven fabrics prepared in the step (c) is 30 to 600 g/m2. |
| 5. | A process for preparing high dielectric nonwoven fabrics according to claim 1 further comprising the step of plasma treating, corona discharging or ion beam treating the nonwoven fabrics prepared in the step (c), after step (c). |
| 6. | A process for preparing high dielectric nonwoven fabrics according to claim 1, wherein inorganic antibacterial compounds are added when mix spinning in the step (a). |
| 7. | High dielectric nonwoven fabrics prepared according to any one of claims 1 to 6. |
| 8. | An electrostatic filter made from the nonwoven fabrics of claim 7. |
| 9. | A sweeper made from the nonwoven fabrics of claim 7. |
Description:
INTERNATIONALSEARCH REPORT Internationa adolication No. Information on patent family members PCT/KR 00/00975 Patent document cited Publication Patent family Publication in search report date member (s) date US A 5110620 05-05-1992 DE A1 3839956 08-06-1989 DE C2 3839956 02-07-1998 JP A2 1199614 11-08-1989 JP B2 2595586 02-04-1997 US A 5112677 12-05-1992 JP A2 1258714 16-10-1989 JP B2 2536584 18-09-1996 US A 5645627 08-07-1997 AU A1 49154/96 18-09-1996 WO A1 9626783 06-09-1996 US A 5877099 02-03-1999 AU A1 57473/96 11-12-1996 CA AA 2219838 28-11-1996 WO A1 9637276 28-11-1996 WO A1 9637276 28-11-1996 AU A1 57473/96 11-12-1996 CA AA 2219838 28-11-1996 US A 5877099 02-03-1999
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