US5445862A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous film and process for production thereof
Assignee: Tokuyama Corp
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Filing: 1994-12-22
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Granted: 1995-08-29
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Expires: 2014-12-22
Abstract
Abstract According to the present specification there is disclosed a porous film having a number of throughholes extending from one side to the other side, obtained by molding into a sheet form a resin composition comprising an ethylene- alpha -olefin copolymer, a thermoplastic elastomer and an inorganic filler and then subjecting the sheet to stretching for orientation. Said porous film has excellent flexibility, stretchability and moisture permeability. These properties are made possible by using individual components in particular proportions, molding the resulting composition into a sheet form and then stretching the sheet to form fine throughholes therein so as to have a moisture permeability of 2,000 g/m2.24 hr or more.
Inventors
- 👤 Shingo Kaneko
- 👤 Yoshio Murakami
- 👤 Yoshinari Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:13
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/76; B01D71/78; C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; B01D71/02; B01D71/022; B01D71/024; C08J; C08J5/00; C08J5/18; C08L23/08; C08L23/0807; C08L23/0815; B01D2325/00; B01D2325/04; B01D2325/20; B01D2325/24; C08J2323/00; C08J2323/02; C08J2323/04; C08L53/00; C08L67/00; C08L75/00; C08L75/04; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24372; Y10T428/24413; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/249986; Y10T428/25
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
178 words
A porous film having a number of throughholes extending from one side to the other side, obtained by processing into a sheet form a resin composition comprising an ethylene-α-olefin copolymer, a thermoplastic elastomer and an inorganic filler and then subjecting the sheet to orientation, in which (a) the ethylene-α-olefin copolymer has a density of 0.86-0.90 g/cm 3 and a molecular weight distribution represented by Mw/Mn, of 3 or less and melting point of 60°-100° C., and is contained in an amount of 65-90% by weight based on the total resin weight, (b) the thermoplastic elastomer is at least one elastomer selected from the group consisting of a styrene-based elastomer, a polyester elastomer and a polyurethane elastomer and is contained in an amount of 35-10% by weight based on the total resin weight, (c) the inorganic filler is contained in an amount of 50-300 parts by weight per 100 parts by weight of the total of the ethylene-α-olefin copolymer and the thermoplastic elastomer, and the moisture permeability of the porous film is 2,000 g/m 2 .24 hr or more.
Claim 2
Dependent Claim
178 words
A porous film having a number of throughholes extending from one side to the other side, obtained by processing into a sheet form a resin composition comprising an ethylene-α-olefin copolymer, a thermoplastic elastomer and an inorganic filler and then subjecting the sheet to orientation, in which (a) the ethylene-α-olefin copolymer has a density of 0.86-0.90 g/cm 3 and a molecular weight distribution represented by Mw/Mn, of 3 or less and melting point of 60°-100° C., and is contained in an amount of 65-90% by weight based on the total resin weight, (b) the thermoplastic elastomer is at least one elastomer selected from the group consisting of a styrene-based elastomer, a polyester elastomer and a polyurethane elastomer and is contained in an amount of 35-10% by weight based on the total resin weight, (c) the inorganic filler is contained in an amount of 50-300 parts by weight per 100 parts by weight of the total of the ethylene-α-olefin copolymer and the thermoplastic elastomer, and the moisture permeability of the porous film is 2,000 g/m 2 .24 hr or more.
Claim 3
Dependent Claim
18 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a density of 0.87-0.89 g/cm 3 .
Claim 4
Dependent Claim
20 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a molecular weight distribution represented by Mw/Mn, of 1.5-3.
Claim 5
Dependent Claim
20 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a molecular weight distribution represented by Mw/Mn, of 1.5-2.5.
Claim 6
Dependent Claim
17 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a melting point of 65°-90° C.
Claim 7
Dependent Claim
17 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a melting point of 70°-85° C.
Claim 8
Dependent Claim
30 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a melt flow index of 0.5-20 g/10 min as measured at 190° C. at a load of 2,160 g.
Claim 9
Dependent Claim
30 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a melt flow index of 1.0-10 g/10 min as measured at 190° C. at a load of 2,160 g.
Claim 10
Dependent Claim
20 words
A porous film of claim 1, wherein the α-olefin of the ethylene-α-olefin copolymer is an α-olefin of 4-10 carbon atoms.
Claim 11
Dependent Claim
15 words
A porous film of claim 1, wherein the α-olefin of the ethylene-α-olefin copolymer is 1-butene.
Claim 12
Dependent Claim
18 words
A porous film of claim 1, wherein the α-olefin content in the ethylene-α-olefin copolymer is 2-40 mole %.
Claim 13
Dependent Claim
18 words
A porous film of claim 1, wherein the α-olefin content in the ethylene-α-olefin copolymer is 5-20 mole %.
Claim 14
Dependent Claim
20 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer has a crystallinity of 5-25% as measured by X-ray diffraction.
Claim 15
Dependent Claim
28 words
A porous film of claim 1, wherein the styrene-based elastomer is a styrene-butadiene block copolymer, a styrene-isoprene block copolymer, a styrene-ethylene-butene block copolymer or a styrene-ethylene-propylene block copolymer.
Claim 16
Dependent Claim
18 words
A porous film of claim 1, wherein the styrene-based elastomer has a hydrogenation degree of 99% or more.
Claim 17
Dependent Claim
18 words
A porous film of claim 1, wherein the styrene content in the styrene-based elastomer is 10-20% by weight.
Claim 18
Dependent Claim
30 words
A porous film of claim 1, wherein the styrene-based elastomer has a melt flow index of 0.1-20 g/10 min as measured at 190° C. at a load of 2,160 g.
Claim 19
Dependent Claim
18 words
A porous film of claim 1, wherein the inorganic filler has an average particle diameter of 0.1-50 μm.
Claim 20
Dependent Claim
18 words
A porous film of claim 1, wherein the inorganic filler has an average particle diameter of 0.5-10 μm.
Claim 21
Dependent Claim
34 words
A porous film of claim 1, wherein the inorganic filler is a metal, a metal oxide, a metal,hydroxide, a metal carbonate, a metal sulfate, a metal carbide, a metal nitride or a metal sulfide.
Claim 22
Dependent Claim
18 words
A porous film of claim 20, wherein the metal hydroxide is magnesium hydroxide, calcium hydroxide or aluminum hydroxide.
Claim 23
Dependent Claim
20 words
A porous film of claim 20, wherein the metal carbonate is magnesium carbonate, calcium carbonate, barium carbonate or sodium carbonate.
Claim 24
Dependent Claim
22 words
A porous film of claim 20, wherein the metal sulfate is sodium sulfate, calcium sulfate, barium sulfate, aluminum sulfate or iron sulfate.
Claim 25
Dependent Claim
44 words
A porous film of claim 1, wherein the ethylene-α-olefin copolymer is contained in an amount of 70-85% by weight based on the total resin weight and the thermoplastic elastomer is contained in an amount of 30-15% by weight based on the total resin weight.
Claim 26
Dependent Claim
36 words
A porous film of claim 1, wherein the inorganic filler is contained in an amount of 80-250 parts by weight per 100 parts by weight of the total of the ethylene-α-olefin copolymer and the thermoplastic elastomer.
Claim 27
Dependent Claim
17 words
A porous film of claim 1, which has a moisture permeability of 2,500-6,000 g/m 2 .24 hr.
Claim 28
Dependent Claim
17 words
A porous film of claim 1, which has a moisture permeability of 3,000-5,000 g/m 2 .24 hr.
Claim 29
Dependent Claim
17 words
A porous film of claim 1, which has a strength at 50% elongation, of 100-500 g/25 mm.
Claim 30
Dependent Claim
17 words
A porous film of claim 1, which has a strength at 50% elongation, of 120-450 g/25 mm.
Claim 31
Dependent Claim
18 words
A porous film of claim 1, which has a residual strain after 50% elongation, of 10% or less.
Claim 32
Dependent Claim
35 words
A porous film of claim 1, which has a tear strength satisfying the following formula Tr≧15+t wherein Tr is a tear strength (g) of porous film and t is a thickness (μm) of porous film.
Claim 33
Dependent Claim
12 words
A porous film of claim 1, which has a porosity of 5-40%.
Claim 34
Dependent Claim
12 words
A porous film of claim 1, which has a porosity of 10-30%.
Claim 35
Dependent Claim
13 words
A porous film of claim 1, which has a thickness of 10-100 μm.
Claim 36
Dependent Claim
13 words
A porous film of claim 1, which has a thickness of 20-50 μm.
Claim 37
Dependent Claim
18 words
A porous film of claim 1, which has a water resistance of 5,000 mmH 2 O or more.
Claim 38
Dependent Claim
18 words
A porous film of claim 1, which has a water resistance of 10,000 mmH 2 O or more.
Claim 39
Dependent Claim
11 words
A porous film of claim 1, which has no yield point.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |