GB1586205A - Propylene polymer film - Google Patents
Propylene polymer film Download PDFInfo
- Publication number
- GB1586205A GB1586205A GB38929/77A GB3892977A GB1586205A GB 1586205 A GB1586205 A GB 1586205A GB 38929/77 A GB38929/77 A GB 38929/77A GB 3892977 A GB3892977 A GB 3892977A GB 1586205 A GB1586205 A GB 1586205A
- Authority
- GB
- United Kingdom
- Prior art keywords
- film
- temperature
- polymer
- sheet
- carried out
- 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
- 229920001155 polypropylene Polymers 0.000 title claims description 14
- 238000000034 method Methods 0.000 claims description 39
- 229920000642 polymer Polymers 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 19
- 238000002425 crystallisation Methods 0.000 claims description 11
- 230000008025 crystallization Effects 0.000 claims description 11
- 230000003746 surface roughness Effects 0.000 claims description 11
- 239000000155 melt Substances 0.000 claims description 10
- -1 polypropylene Polymers 0.000 claims description 7
- 239000004743 Polypropylene Substances 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000003851 corona treatment Methods 0.000 claims description 3
- 238000010292 electrical insulation Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- CXWXQJXEFPUFDZ-UHFFFAOYSA-N tetralin Chemical compound C1=CC=C2CCCCC2=C1 CXWXQJXEFPUFDZ-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 235000006708 antioxidants Nutrition 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000006224 matting agent Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000615 nonconductor Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 238000005201 scrubbing Methods 0.000 description 1
- 239000012748 slip agent Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling drums
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
- B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Moulding By Coating Moulds (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
(54) IMPROVEMENTS IN AND RELATING TO PROPYLENE
POLYMER FILM
(71) We, TORAY INDUSTRIES, INC., a Body Corporate organized according to the laws of Japan, having a place of business at 2, Nihonbashi-Muromachi, 2-Chome, Chuo-Ku,
Tokyo, Japan, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
This invention relates to a process for manufacturing polypropylene film with surface roughness, to film produced by the process, and to articles containing the film.
There are many well-known processes for obtaining rough surface film, for example, by adding a large quantity of inorganic additives, by scrubbing with abrasive particles, by embossing, or by coating with matting agents.
These processes, however, are unsuitable for electrical insulation use if they contain inorganic additives, or are difficult to produce uniform film with surface roughness by friction and pressure to the chilled and solidifed film surface because of distortions occurring at the film surface and unequal size of roughness pattern.
The deterioration of electrical properties that results from adding inorganic materials makes this process valueless for material for electrical use.
The present invention not only provides a film of a propylene polymer suitable for use as an electrical insulator but also provides film which additionally has superior anti-blocking properties.
In the present specification, the term "propylene polymer" means propylene homopolymer as well as copolymers containing more than 50% by weight of propylene and a minor proportion of a further a-olefine, for example ethylene or butene. Blends of the polymer may also be used, especially with polymers of other a-olefins.
The polymer may contain small amounts of additives, e.g., anti-oxidants, pigments, plasticizers, and organic slip agents.
The present invention provides a process for the manufacture of biaxially oriented film of a propylene polymer (as hereinbefore defined), which comprises extruding the polymer in the melt, cooling it to form a sheet and subsequently biaxially orienting the sheet, the cooling rate at the crystallization temperature of the polymer (tc) being at most 80 deg C/sec and the time for which the surface temperature of the extruded melt is in the range between tc and (tc -20 C) being at least 1/3 second.
The melt of the polymer may be extruded from a slot die and cooled by being cast on a chill roll.
The biaxial stretching of the sheet is advantageously carried out immediate after the extruded polymer has been cooled to form a sheet; preferably sequential stretching is used, longitudinal stretching advantageously preceding transverse stretching. The stretching may be carried out at the usual temperatures and ratios; the material may be finally heat set, if desired.
The invention also provides a sheet, as produced by the process before the orientation step, and an oriented film produced by the process. The invention further provides an electrical component, especially a capacitor, comprising the oriented film.
The characteristic feature of the process of the present invention is the promotion of crystallization of the sheet surface by slowing the cooling rate, keeping the temperature in the range of the crystallization temperature, while the melt sheet is cast on chilled roll.
Crystallization is further promoted if a relatively high temperature is used for the first stretching, advantageously in the range between the melting peak temperature of the polymer crystal (tm) and (tm - 50"C).
By a second stretching at right angles to the first, biaxially oriented film with rough surface and superior anti-blocking properties is obtained. The crystallization temperature of the polymer (tc) is measured by differential scanning calorimeter (D.S.C.). In the case of polypropylene it is usually 110 to 1200C, but it may be changed slightly by adding some additives, e.g, blending another polymer or by copolymerization.
The cooling rate is determined by the following equation: dt = U . At dO dp.p.1 where, dt : cooling rate [deg.C/hr]
dO
t : sheet temperature [ C] H : time [hr]
U : overall coefficient of heat transfer [kcal/m2.hr.degC] At: sheet temperature minus cooling temperature [deg.C] dp: specific heat of the sheet [kcal/kg.deg.C]
* "extruded melt" or "melt sheet".
p: density of the sheet [kg/m3 1: thickness of the sheet [m]
In the above definitions "sheet", where appropriate includes *
In the case of polypropylene, we can calculate, concretely, by the following equation:
cooling rate = 235 x (sheet temperature - cooling temperature) thickness ot sheet
(deg.C/sec)
In the process of the invention, it is required both that the cooling rate at crystallization
temperature of the polymer (tc) be kept less than 80 deg. C/sec and that the interval of time that the surface temperature of the extruded melt is in the range between tc and (tc - 20"C) is at least 1/3 second. Without these conditions, the sheet may adhere to the cooling drum or
crystallization may not be promoted, so the required result cannot be achieved.
The next step is to crystallize and haze the polymer film by the first stretching, preferably in
the range between the melting temperature of the polymer crystal (tm) and (tm - 35"C). (tm) is
also measured by D.S.C. and in the case of polypropylene it is usually 150 to 1700C. The first
stretching ratio is advantageously 3.5 to 6.0.
In the second stretching (at right angles to the first), stretching is preferably carried out a
temperature in the range between (tm - 25"C) and (tm + 15"C), and at a stretching ratio from
6.0 to 12.0. If desired or required surface treatment, e.g., corona treatment is carried out.
Advantageously, the final thickness of the stretched film is less than 25 microns, preferably
under 20 microns, advantageously under 15 microns. The surface roughness of the film is
advantageously 0.3 to 2.0 microns.
One process for manufacturing film, in accordance with the invention will now be
described, by way of example only, with reference to the accompanying drawing, the sole
figure of which diagramatically shows an apparatus on which the process may be carried out.
Referring to the figure, a melt sheet 2 is extruded from a die 1; cooled and cast on a chilled
drum 3; becoming a sheet for stretching 4. This sheet 4 is stretched in the longitudinal
direction by rolls 5 to 7 rotating at a low velocity and rolls 8, 9 rotating at a higher velocity, a
heating device 10 maintaining the desired temperature. The biaxially oriented film is
obtained by stretching at right angles to the first direction in a tenter frame, (not shown). The
film leaves the longitudinal stretching device in the direction of the arrow and is then
conveyed towards the tenter frame.
The invention will be further illustrated by reference to the following examples.
EXAMPLES I to 3
Isotactic polypropylene (intrinsic viscosity in tetralin at 1350C = 2.20, tc = 116"C, tm = 1600C) is extruded from a T type die at 280 C, and becomes the melt sheet of polymer. This
melt sheet of polymer is cooled on the chilled drum at the surface temperatures and the
residence times, shown in the Table below, and becomes uni-axially oriented film by stretch
ing at the various temperature in the range between 125"C and 135"C, keeping the stretching
ratio 4.5.
The bi-axially oriented film with a final thickness of 6 microns is obtained by using a
stretching ratio of 8.5. a stretching temperature of 1500C, and a heat setting temperature of 165"C.
The Table illustrates the results obtained in the surface roughness, haze, anti-blocking
character. surface appearance, and film quality, the film quality being measured by unifor mity of thickness and resistance to rupture.
Table
Comparison Examples
(A) (B) (1) (2) (3)
Coolingrate*(deg.C/sec) 85 85 80 40 40
Residencetime**(sec) 0.25 0.25 0.35 0.80 0.80 1st stretching temperature ( C) 125 135 125 125 135
Haze (%) 0.20 0.50 1.00 2.10 3.50
Blocking shear force * * * (kg/12cm2) 250 Surface roughness (it) 0.1 0.5 0.8 1.0 1.2
Surface appearance U. N.U. U. U. U.
Film quality S.B. G. G. G. G.
here U. = uniform, N.U. = not uniform S.B. = slightly bad, G. = good (Notes) * : cooling rate of the sheet surface at
the crystallization temperature
** : interval of time while the surface
temperature of the film is in the range
between re and (te - 20"C) *** * * : measured value after the corona treatment The measurements were made as follows:
haze: based upon ASTM (D 1003-52, D 1003-61)
blocking shear force: measured by the Chopper
(tension dynamometer) after pressing film pieces 30mm x 40mm with a load of 480 g/ 12
cm 2 in an atmosphere of 40"C, and 85 % relative humidity for 24 hours.
surface roughness: based upon JIS B 0601
As shown in the table, the surface roughness of the film is within the range of from 0.3 to 2.0 microns, and its haze is more than 1%, when the cooling conditions are kept within the prescribed range. The surface appearance is then uniform.
The films manufactured in accordance with the invention are suitable for electrical insulation use, especially capacitor use, because their surfaces are roughened without inorganic additives.
WHAT WE CLAIM IS:
1. A process for the manufacture of biaxially oriented film of a propylene polymer (as hereinbefore defined) which comprises extruding the polymer in the melt, cooling it to form a sheet and subsequently biaxially orienting the sheet, the cooling rate at the crystallization temperature of the polymer (tc) being at most 80 deg. C/ sec and the time for which the surface temperature of the extruded melt is in the range between te and (te - 20"C) being at least 1/3 second.
2. A process as claimed in claim 1, wherein the melt is extruded from a slot die and cast onto a chill roll.
3. A process as claimed in claim 1 or claim 2, wherein biaxial orientation is carried out sequentially, the longitudinal stretching preceding transverse stretching.
4. A process as claimed in claim 3, wherein longitudinal stretching is carried out at a temperature between the peak melting temperature of the crystals of the polymer (tm) and (tm - 500C).
5. A process as claimed in claim 4, wherein longitudinal stretching is carried out between (try) and (tm- 35"C).
6. A process as claimed in any one of claims 3 to 5, wherein the longitudinal stretching ratio is from 3.5 to 6.0.
7. A process as claimed in any one of claims 3 to 6, wherein transverse stretching is carried out between (tm - 25"C) and(tm + 15"C).
8. A process as claimed in any one of claims 3 to 7, wherein the transverse stretching ratio is from 6.0 to 12.0.
9. A process as claimed in any one of claims 1 to 8, wherein the biaxially oriented film thickness is up to 20,.
10. A process as claimed in any one of claims 1 to 9, wherein the biaxially oriented film
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (19)
1. A process for the manufacture of biaxially oriented film of a propylene polymer (as hereinbefore defined) which comprises extruding the polymer in the melt, cooling it to form a sheet and subsequently biaxially orienting the sheet, the cooling rate at the crystallization temperature of the polymer (tc) being at most 80 deg. C/ sec and the time for which the surface temperature of the extruded melt is in the range between te and (te - 20"C) being at least 1/3 second.
2. A process as claimed in claim 1, wherein the melt is extruded from a slot die and cast onto a chill roll.
3. A process as claimed in claim 1 or claim 2, wherein biaxial orientation is carried out sequentially, the longitudinal stretching preceding transverse stretching.
4. A process as claimed in claim 3, wherein longitudinal stretching is carried out at a temperature between the peak melting temperature of the crystals of the polymer (tm) and (tm - 500C).
5. A process as claimed in claim 4, wherein longitudinal stretching is carried out between (try) and (tm- 35"C).
6. A process as claimed in any one of claims 3 to 5, wherein the longitudinal stretching ratio is from 3.5 to 6.0.
7. A process as claimed in any one of claims 3 to 6, wherein transverse stretching is carried out between (tm - 25"C) and(tm + 15"C).
8. A process as claimed in any one of claims 3 to 7, wherein the transverse stretching ratio is from 6.0 to 12.0.
9. A process as claimed in any one of claims 1 to 8, wherein the biaxially oriented film thickness is up to 20,.
10. A process as claimed in any one of claims 1 to 9, wherein the biaxially oriented film
thickness is up to 15 it.
11. A process as claimed in any one of claims 1 to 10, wherein the surface roughness is from 0.3 to 2.0 it.
12. A process as claimed in any one of claims 1 to 11, wherein the biaxially oriented film is heat-set.
13. A process as claimed in any one of claims 1 to 12, wherein the polymer is polypropylene.
14. A process as claimed in claim 1, carried out substantially as described in any one of
Examples 1 to 3.
15. A process as claimed in claim 1, carried out substantially as described with reference to and as illustrated by the accompanying drawing.
16. A biaxially oriented film, whenever made by a process as claimed in any one of claims 1 to 15.
17. An electrical component comprising a film as claimed in claim 16.
18. A capacitor comprising a film as claimed in claim 16.
19. A sheet, as made by cooling a propylene polymer (as hereinbefore defined) under the conditions specified in claim 1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179576A JPS5337774A (en) | 1976-09-20 | 1976-09-20 | Method of producing roughened polypropylene film |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1586205A true GB1586205A (en) | 1981-03-18 |
Family
ID=14570336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB38929/77A Expired GB1586205A (en) | 1976-09-20 | 1977-09-19 | Propylene polymer film |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5337774A (en) |
| DE (1) | DE2740237C2 (en) |
| FI (1) | FI63885C (en) |
| FR (1) | FR2364752A1 (en) |
| GB (1) | GB1586205A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502263A (en) * | 1982-12-24 | 1985-03-05 | Hoechst Aktiengesellschaft | Sealable polyolefinic multilayer film |
| US4773139A (en) * | 1985-10-31 | 1988-09-27 | Hoechst Aktiengesellschaft | Method for manufacturing an electrical capacitor |
| US4925728A (en) * | 1986-09-13 | 1990-05-15 | Hoechst Aktiengesellschaft | Multilayer film suitable as a release sheet in the production of decorative laminate panels |
Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2851557C2 (en) * | 1978-11-29 | 1982-04-01 | Hoechst Ag, 6000 Frankfurt | Biaxially stretched polypropylene composite film for use as an electrical insulating film |
| DE2942298C2 (en) * | 1979-10-19 | 1985-06-13 | Hoechst Ag, 6230 Frankfurt | Process for the production of a rough polypropylene electrical insulation film |
| EP0036457B1 (en) * | 1980-03-20 | 1985-02-20 | Mitsubishi Rayon Co., Ltd. | A method of producing a polypropylene film for electrical appliances |
| DE3029326A1 (en) * | 1980-08-01 | 1982-02-18 | Ero-Starkstrom Kondensatoren Gmbh, 8300 Landshut | Impregnated winding capacitor |
| JPS57110280A (en) * | 1980-12-27 | 1982-07-09 | Sofuia Kk | Method of controlling discharge of safe ball of pinball machine |
| JPS59211908A (en) * | 1983-05-17 | 1984-11-30 | 株式会社東芝 | Oil-filled film capacitor |
| JPS61103462A (en) * | 1984-10-25 | 1986-05-21 | 株式会社 藤商事 | Ball payout mechanism of pinball game machine |
| JPS6245082U (en) * | 1985-09-06 | 1987-03-18 | ||
| JPH0639741Y2 (en) * | 1987-08-31 | 1994-10-19 | 株式会社ニューギン | Prize ball emission control device for pachinko machines |
| DE19622082C1 (en) * | 1996-05-31 | 1997-11-20 | Brueckner Maschbau | Process for the preparation of a filler-containing printable polymer film |
| FI20055500A0 (en) * | 2005-09-19 | 2005-09-19 | Conenor Oy | Method and apparatus for making plastic film |
| JP2015202662A (en) * | 2014-04-16 | 2015-11-16 | 住友ベークライト株式会社 | Production method of release film |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT557911A (en) * | 1954-06-08 | 1900-01-01 | ||
| DE1264746B (en) * | 1962-09-11 | 1968-03-28 | Nihonbashi Muromachi | Process for the production of thermoplastic plastic films with a rough surface |
| DE2061418A1 (en) * | 1970-12-14 | 1972-06-22 | Kalle Ag | Biaxially stretched film made of polypropylene or a mixed polymer or mixtures of polypropylene and polyethylene and process for making the same |
| JPS5650691B2 (en) * | 1973-11-01 | 1981-12-01 | ||
| JPS5153253A (en) * | 1974-11-01 | 1976-05-11 | Matsushita Electric Ind Co Ltd | |
| DE2660907C2 (en) * | 1975-02-28 | 1989-09-07 | General Electric Co., Schenectady, N.Y., Us |
-
1976
- 1976-09-20 JP JP11179576A patent/JPS5337774A/en active Pending
-
1977
- 1977-09-07 DE DE2740237A patent/DE2740237C2/en not_active Expired
- 1977-09-19 FI FI772746A patent/FI63885C/en not_active IP Right Cessation
- 1977-09-19 GB GB38929/77A patent/GB1586205A/en not_active Expired
- 1977-09-20 FR FR7728277A patent/FR2364752A1/en active Granted
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4502263A (en) * | 1982-12-24 | 1985-03-05 | Hoechst Aktiengesellschaft | Sealable polyolefinic multilayer film |
| US4773139A (en) * | 1985-10-31 | 1988-09-27 | Hoechst Aktiengesellschaft | Method for manufacturing an electrical capacitor |
| US4925728A (en) * | 1986-09-13 | 1990-05-15 | Hoechst Aktiengesellschaft | Multilayer film suitable as a release sheet in the production of decorative laminate panels |
Also Published As
| Publication number | Publication date |
|---|---|
| FI63885C (en) | 1983-09-12 |
| JPS5337774A (en) | 1978-04-07 |
| FR2364752A1 (en) | 1978-04-14 |
| DE2740237A1 (en) | 1978-03-23 |
| FI772746A (en) | 1978-03-21 |
| FI63885B (en) | 1983-05-31 |
| FR2364752B1 (en) | 1981-11-13 |
| DE2740237C2 (en) | 1982-08-26 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |