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公开(公告)号：DE69119948D1
公开(公告)日：1996-07-11
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：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：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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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：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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Patent Agency Ranking
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：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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公开(公告)号：CA2056579A1
公开(公告)日：1992-05-31
申请号：CA2056579
申请日：1991-11-28
Applicant: MITSUI PETROCHEMICAL IND
Inventor： MATSUURA SATOSHI , KISHIBA TSUNEO , SHINAGAWA YOSHIO
Abstract: ABSRACT An electret filter made of a resin whose angle of contact upon wetting with pure water is no smaller than 95 degrees, as well as an electret filter made of a resin whose angle of contact upon wetting with pure water has been adjusted to no smaller than 95 degrees by addition of silicone oil. Those electret filters have high trapping efficiency and their ability to trap particulates, especially cigarette smoke, will not deteriorate even if they are continuously used. Therefore, they can advantageously be used as filter media in many applications such as home and industrial air conditioners, air cleaners, fan heaters, vacuum cleaners, and air conditioning systems for common equipment.
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