GB1287505A - Microporous films and their production - Google Patents
Microporous films and their productionInfo
- Publication number
- GB1287505A GB1287505A GB54057/70A GB5405770A GB1287505A GB 1287505 A GB1287505 A GB 1287505A GB 54057/70 A GB54057/70 A GB 54057/70A GB 5405770 A GB5405770 A GB 5405770A GB 1287505 A GB1287505 A GB 1287505A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stretch
- film
- stretching
- nov
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
- B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/023—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets using multilayered plates or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
- B29L2023/001—Tubular films, sleeves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
1287505 Microporous films CELANESE CORP 13 Nov 1970 [13 Nov 1969 28 Oct 1970] 54057/70 Heading B5B [Also in Division C3] An open celled microporous polymer film, of which the pore size is less than 5000 Angstroms, has a crystallinity above 30%, an elastic recovery of at least 50% (from 50% strain at zero recovery time, 25 C. and 65% R.H.), a nitrogen flux greater than 35À4 g. mole/cm.<SP>2</SP> min. 10<SP>3</SP> and a bulk density no greater than 95% of that of an equivalent non-porous film. The film is made by stretching in two steps in the same direction a non-porous film of an elastic polymer, e.g. polyethylene, polypropylene or a trioxane-ethylene oxide copolymer, having a crystallinity above 20%. The first stretch is at a temperature below that at which melting begins and produces pore spaces perpendicular to the stretch direction; the second stretch is above the temperature at which melting begins but below the fusion temperature and produces pore spaces elongated in the stretch direction. No more than 5% intermediate shrinkage is allowed between these stretching steps. The film is finally heatset under tension without allowing more than 15% shrinkage or further stretching. The first stretch may be at 10-70 C. and the second at 120-150 C. Heat setting may be at 80- 160 C. The ratio of "first" to "second" stretching amounts may be 0À10 : 1 to 0À99 : 1, the total stretch being 10-300%. The initial film may have been drawn down on extrusion to provide orientation, followed by heat-setting to effect crystallization.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US87651169A | 1969-11-13 | 1969-11-13 | |
US8471270A | 1970-10-28 | 1970-10-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1287505A true GB1287505A (en) | 1972-08-31 |
Family
ID=26771333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB54057/70A Expired GB1287505A (en) | 1969-11-13 | 1970-11-13 | Microporous films and their production |
Country Status (8)
Country | Link |
---|---|
BE (1) | BE758823A (en) |
CA (1) | CA925671A (en) |
CH (1) | CH539496A (en) |
DE (1) | DE2055193C2 (en) |
ES (1) | ES385526A1 (en) |
FR (1) | FR2067271B1 (en) |
GB (1) | GB1287505A (en) |
IL (1) | IL35643A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3843761A (en) * | 1973-05-30 | 1974-10-22 | Celanese Corp | Process for preparing a thermoplastic microporous film involving a cold stretching step and multiple hot stretching steps |
ZA80465B (en) * | 1979-02-13 | 1981-08-26 | Celanese Corp | Process for preparing hollow microporous polypropylene fibers |
US5677360A (en) * | 1991-02-13 | 1997-10-14 | Mitsubishi Rayon Co., Ltd. | Hydrophilic polymer alloy, fiber and porous membrane comprising this polymer alloy, and methods for preparing them |
WO1992014783A1 (en) * | 1991-02-13 | 1992-09-03 | Mitsubishi Rayon Co., Ltd. | Hydrophilic polymer alloy, fiber and porous film produced therefrom, and production of the same |
WO2002103099A1 (en) | 2001-06-19 | 2002-12-27 | Kappler Safety Group | Vapor permeable, liquid impermeable composite fabric and fabrication process |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB887346A (en) * | 1959-09-09 | 1962-01-17 | Ici Ltd | Linear polyester films and processes for their production |
US3426754A (en) * | 1964-06-12 | 1969-02-11 | Celanese Corp | Breathable medical dressing |
FR1544807A (en) * | 1967-09-27 | 1968-11-08 | Celanese Corp | Open cell film |
-
0
- BE BE758823D patent/BE758823A/en not_active IP Right Cessation
-
1970
- 1970-11-10 DE DE2055193A patent/DE2055193C2/en not_active Expired
- 1970-11-12 CH CH1677370A patent/CH539496A/en not_active IP Right Cessation
- 1970-11-12 IL IL35643A patent/IL35643A/en unknown
- 1970-11-13 GB GB54057/70A patent/GB1287505A/en not_active Expired
- 1970-11-13 ES ES385526A patent/ES385526A1/en not_active Expired
- 1970-11-13 CA CA098131A patent/CA925671A/en not_active Expired
- 1970-11-13 FR FR7040543A patent/FR2067271B1/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH539496A (en) | 1973-07-31 |
IL35643A0 (en) | 1971-02-25 |
ES385526A1 (en) | 1973-10-01 |
DE2055193C2 (en) | 1985-09-12 |
IL35643A (en) | 1973-07-30 |
FR2067271B1 (en) | 1975-01-10 |
BE758823A (en) | 1971-05-12 |
CA925671A (en) | 1973-05-08 |
DE2055193A1 (en) | 1971-05-19 |
FR2067271A1 (en) | 1971-08-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PE20 | Patent expired after termination of 20 years |