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US4777073A
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US
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Breathable films prepared from melt embossed polyolefin/filler precursor films
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1987-03-11
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Granted: 1988-10-11
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Expires: 2007-03-11
Abstract
Abstract A breathable polyolefin film is prepared by melt embossing a highly filled polyolefin film to impose a pattern of different film thickness therein and by stretching the melt embossed film to impart greater permeability in the areas of reduced thickness in comparison to the areas of greater thickness.
Inventors
- 👤 Paresh J. Sheth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:45
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29D; B29D7/00; B29D7/01; B29C; B29C55/00; B29C59/00; B29C71/00; B29C71/02; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B29K2105/00; B29K2105/06; B29K2105/16; B29K2995/00; B29K2995/0037; B29K2995/0065; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24471; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/31
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
65 words
A method of making a breathable film comprising the steps of: mixing a polyolefin with a filler; extruding a precursor film from the polyolefin/filler mixture; melt embossing the precursor film to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 2
Independent Claim
65 words
A method of making a breathable film comprising the steps of: mixing a polyolefin with a filler; extruding a precursor film from the polyolefin/filler mixture; melt embossing the precursor film to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 3
Dependent Claim
31 words
The method of claim 1, further comprising the step of heat setting the stretched film at a temperature above the stretching temperature and below the softening temperature of the stretched film.
Claim 4
Dependent Claim
20 words
The method of claim 1, wherein the polyolefin is a copolymer of ethylene and a C 4 -C 10 alpha-olefin.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein the filler is calcium carbonate surface treated with calcium stearate.
Claim 6
Dependent Claim
16 words
The method of claim 1, wherein the precursor film is melt embossed with a diamond pattern.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the polyolefin/filler mixture contains between about 15 percent to about 35 percent filler by volume.
Claim 8
Dependent Claim
65 words
A breathable film produced by a process comprising the steps of: mixing a polyolefin with a filler; extruding a precursor film from the polyolefin/filler mixture; melt embossing the precursor film to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 9
Dependent Claim
65 words
A breathable film produced by a process comprising the steps of: mixing a polyolefin with a filler; extruding a precursor film from the polyolefin/filler mixture; melt embossing the precursor film to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 10
Dependent Claim
33 words
The breathable film of claim 7, further produced by the step of heat setting the stretched film at a temperature above the stretching temperature and below the softening temperature of the stretched film.
Claim 11
Dependent Claim
21 words
The breathable film of claim 7, wherein the polyolefin is a copolymer of ethylene and a C 4 -C 10 alpha-olefin.
Claim 12
Dependent Claim
17 words
The breathable fllm of claim 7, wherein the filler is calcium carbonate surface treated with calcium stearate.
Claim 13
Dependent Claim
17 words
The breathable film of claim 7, wherein the precursor film is melt embossed with a diamond pattern.
Claim 14
Dependent Claim
22 words
The breathable film of claim 7, wherein the polyolefin/filler mixture contains between about 15 percent to about 35 percent filler by volume.
Claim 15
Dependent Claim
34 words
A breathable film, comprising: a polyolefin and a filler; and a pattern of different film thicknesses having greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 16
Dependent Claim
34 words
A breathable film, comprising: a polyolefin and a filler; and a pattern of different film thicknesses having greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 17
Dependent Claim
21 words
The breathable film of claim 13, wherein the polyolefin is a copolymer of ethylene and a C 4 -C 10 alpha-olefin.
Claim 18
Dependent Claim
17 words
The breathable film of claim 13, wherein the filler is calcium carbonate surface treated with calcium stearate.
Claim 19
Dependent Claim
17 words
The breathable film of claim 13, wherein the pattern of different film thicknesses is a diamond pattern.
Claim 20
Dependent Claim
34 words
The breathable film of claim 13, wherein the filler is present in an amount between about 15 percent to about 35 percent by volume of the total amount of the polyolefin and the filler.
Claim 21
Independent Claim
72 words
A method of making a breathable film comprising the steps of: mixing a polyolefin with a filler; cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film in the transverse direclion to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 22
Independent Claim
72 words
A method of making a breathable film comprising the steps of: mixing a polyolefin with a filler; cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film in the transverse direclion to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 23
Dependent Claim
31 words
The method of claim 18, further comprising the step of heat setting the stretched film at a temperature above the stretching temperature and below the softening temperature of the stretched film.
Claim 24
Dependent Claim
20 words
The method of claim 18, wherein the polyolefin is a copolymer of ethylene and a C 4 -C 10 alpha-olefin.
Claim 25
Dependent Claim
16 words
The method of claim 18, wherein the filler is calcium carbonate surface treated with calcium stearate.
Claim 26
Dependent Claim
16 words
The method of claim 18, wherein the precursor film is melt embossed with a diamond pattern.
Claim 27
Dependent Claim
21 words
The method of claim 18, wherein the polyolefin/filler mixture contains between about 15 percent to about 35 percent filler by volume.
Claim 28
Dependent Claim
72 words
A breathable film produced by a process comprising the steps of: mixing a polyolefin with a filler; cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film in the transverse direction to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 29
Dependent Claim
72 words
A breathable film produced by a process comprising the steps of: mixing a polyolefin with a filler; cast extruding a precursor film of the polyolefin/filler mixture onto at least one melt embossing roller to impose therein a pattern of different film thicknesses; and stretching the melt embossed precursor film in the transverse direction to impart greater permeability in the areas of reduced thickness thereof in comparison to the areas of greater thickness.
Claim 30
Dependent Claim
33 words
The breathable film of claim 24, further produced by the step of heat setting the stretched film at a temperature above the stretching temperature and below the softening temperature of the stretched film.
Claim 31
Dependent Claim
21 words
The breathable film of claim 24, wherein the polyolefin is a copolymer of ethylene and a C 4 -C 10 alpha-olefin.
Claim 32
Dependent Claim
17 words
The breathable film of claim 24, wherein the filler is calcium carbonate surface treated with calcium stearate.
Claim 33
Dependent Claim
17 words
The breathable film of claim 24, wherein the precursor film is melt embossed with a diamond pattern.
Claim 34
Dependent Claim
22 words
The breathable film of claim 24, wherein the polyolefin/filler mixture contains between about 15 percent to about 35 percent filler by volume.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-11 | 1992-04-11 | 1992-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-11 | 1996-04-11 | 1996-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-11 | 2000-04-11 | 2000-10-11 | $7700.00 | Window Closed / Lapsed |