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公开(公告)号：DE69317622T2
公开(公告)日：1998-08-20
申请号：DE69317622
申请日：1993-10-19
Applicant: MITSUI PETROCHEMICAL IND
Inventor： YUASA HARUO , MITO MASAYUKI , TAKATA YUKIHIRO , MATSUURA SATOSHI
Abstract: The improved nonwoven fabric in an electret state is composed of monofilaments with an average fiber diameter of 0.5 - 100 mu m that are formed of a polymer composition containing no more than 1 mol% of polar groups; the fabric has a weight of 5 - 100 g/m , a bulk density of 0.05 - 0.40 g/cm and an average surface charge density of at least 0.1 x 10 C/cm . This nonwoven fabric is capable of efficient dust collection and its trapping ability is retained for a prolonged time even in a hot and humid condition. Also disclosed are a process for producing this nonwoven fabric, as well as a filtering and an air masking material which are composed of that nonwoven fabric.
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公开(公告)号：DE69214505D1
公开(公告)日：1996-11-21
申请号：DE69214505
申请日：1992-05-01
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , YOKOYAMA AKIRA , SHINAGAWA YOSHIO
IPC: B01D39/00 , B01D39/04 , B01D39/08 , B01D39/14 , B03C3/28 , B29C35/08 , B29C55/06 , B29C71/04 , C07C51/42 , H01G7/02 , B01D39/16
Abstract: A method for producing an electret filter, which methods comprises forming a film comprising a high molecular weight compound, optionally stretching the film, splitting the optionally stretched film to form split yarns, subjecting the split yarns to homo charging to obtain charged split yarns, and forming the charged split yarns into the electret filter.
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公开(公告)号：AT139054T
公开(公告)日：1996-06-15
申请号：AT91302033
申请日：1991-03-12
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , SHINAGAWA YOSHIO
Abstract: A process for producing an electret which comprises alternating at least two cycles of applying electric charges to an article of interest and subsequently heating said article. This process may be applied to a drawn or undrawn film to produce a film electret, or it may be applied to a woven or nonwoven fabric to produce a sheet of fiber electret. Also disclosed are a film electret that contains a polar high-molecular weight compound and that provides a TSDC curve having a homocharge peak temperature of at least 95 DEG C and a heterocharge peak temperature of at least 80 DEG C, as well as an electret filter composed of fibers obtainable by fibrillating said film of resin electret.
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公开(公告)号：CA2037942A1
公开(公告)日：1991-09-13
申请号：CA2037942
申请日：1991-03-11
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , SHINAGAWA YOSHIO
Abstract: The improved process fro producing an electret includes the step of alternating continuously at least two cycles of applying electric charges to an article of interest and subsequently heating said article. This process may be applied to a drawn or undrawn film to produce a film electret, or it may be applied to a woven or nonwoven fabric to produce a sheet of fiber electret. Also disclosed are a film electret that contains a polar high-molecular weight compound and that provides a TSDC curve having a homocharge peak temperature of at least 95.degree.C and a heterocharge peak temperature of at least 80.degree.C, as well as an electret filter composed of fibers that are obtained by fibrillating said film of resin electret.
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公开(公告)号：DE69214505T2
公开(公告)日：1997-03-20
申请号：DE69214505
申请日：1992-05-01
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , YOKOYAMA AKIRA , SHINAGAWA YOSHIO
IPC: B01D39/00 , B01D39/04 , B01D39/08 , B01D39/14 , B03C3/28 , B29C35/08 , B29C55/06 , B29C71/04 , C07C51/42 , H01G7/02 , B01D39/16
Abstract: A method for producing an electret filter, which methods comprises forming a film comprising a high molecular weight compound, optionally stretching the film, splitting the optionally stretched film to form split yarns, subjecting the split yarns to homo charging to obtain charged split yarns, and forming the charged split yarns into the electret filter.
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Patent Agency Ranking
公开(公告)号：CA2067925A1
公开(公告)日：1992-11-03
申请号：CA2067925
申请日：1992-05-01
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , YOKOYAMA AKIRA , SHINAGAWA YOSHIO
IPC: B01D39/00 , B01D39/04 , B01D39/08 , B01D39/14 , B03C3/28 , B29C35/08 , B29C55/06 , B29C71/04 , C07C51/42 , H01G7/02 , C08J3/28 , D01D5/42
Abstract: A highly efficient, reliable method is provided for producing an electret filter having an excellent collection efficiency. The method comprises the steps of forming a film comprising a high molecular weight compound, splitting the film to form split yarns, subjecting the split yarns to a homo charging, and producing the electret filter from the charged split yarns.
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公开(公告)号：DE69119948T2
公开(公告)日：1996-10-24
申请号：DE69119948
申请日：1991-03-12
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , SHINAGAWA YOSHIO
Abstract: A process for producing an electret which comprises alternating at least two cycles of applying electric charges to an article of interest and subsequently heating said article. This process may be applied to a drawn or undrawn film to produce a film electret, or it may be applied to a woven or nonwoven fabric to produce a sheet of fiber electret. Also disclosed are a film electret that contains a polar high-molecular weight compound and that provides a TSDC curve having a homocharge peak temperature of at least 95 DEG C and a heterocharge peak temperature of at least 80 DEG C, as well as an electret filter composed of fibers obtainable by fibrillating said film of resin electret.
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公开(公告)号：CA2108613A1
公开(公告)日：1994-04-20
申请号：CA2108613
申请日：1993-10-18
Applicant: MITSUI PETROCHEMICAL IND
Inventor： YUASA HARUO , MITO MASAYUKI , TAKATA YUKIHIRO , MATSUURA SATOSHI
Abstract: The improved nonwoven fabric in an electret state is composed of monofilaments with an average fiber diameter of 0.5 - 100 .mu.m that are formed of a polymer composition containing no more than 1 mol% of polar groups; the fabric has a weight of 5 - 100 g/m2, a bulk density of 0.05 - 0.40 g/cm3 and an average surface charge density of at least 0.1 x 10-9 C/cm2. This nonwoven fabric is capable of efficient dust collection and its trapping ability is retained for a prolonged time even in a hot and humid condition. Also disclosed are a process for producing this nonwoven fabric, as well as a filtering and an air masking material which are composed of that nonwoven fabric.
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公开(公告)号：HK14197A
公开(公告)日：1997-02-14
申请号：HK14197
申请日：1997-02-05
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , SHINAGAWA YOSHIO
Abstract: A process for producing an electret which comprises alternating at least two cycles of applying electric charges to an article of interest and subsequently heating said article. This process may be applied to a drawn or undrawn film to produce a film electret, or it may be applied to a woven or nonwoven fabric to produce a sheet of fiber electret. Also disclosed are a film electret that contains a polar high-molecular weight compound and that provides a TSDC curve having a homocharge peak temperature of at least 95 DEG C and a heterocharge peak temperature of at least 80 DEG C, as well as an electret filter composed of fibers obtainable by fibrillating said film of resin electret.
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公开(公告)号：CA1325983C
公开(公告)日：1994-01-11
申请号：CA588006
申请日：1989-01-11
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , MITO MASAYUKI , SHINAGAWA YOSHIO
Abstract: Provided herein is a process for preparing an electret filter which comprises feeding a non-woven fabric composed of an electrically charged web of synthetic fibers through a nip of co-operating embossing and flat rolls under pressure and at a temperature below a softening temperature of said synthetic fibers, thereby subjecting the surface of said non-woven fabric to partical fusion bonding and integration.
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