USRE28606E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filled, biaxially oriented, polymeric film
Assignee: —
•
Filing: 1973-08-31
•
Granted: 1975-11-04
•
Expires: 1993-08-31
Abstract
Abstract A thermoplastic film and a process for preparing the film which is characterized as a cellular polymer matrix with a filler dispersed therein, biaxially oriented by stretching in mutually perpendicular directions and having a void content of at least about 30 to 70%, an elongation at break at 22*C. of at least about 8% in either direction of stretch, a fibrous surface having about 2 to 40 surface ruptures per square millimeter, and an oxygen permeability of about 900 to 10,000,000 cc./100 sq.in./24 hrs./atmosphere/mil. This film has many desirable and controllable properties such as density, opacity, porosity, strength and surface texture making it useful for various applications such as a bag for packaging groceries, a synthetic writing paper, an ultra filter, or a substrate for an ion exchange membrane.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:05
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/02; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24471; Y10T428/24479; Y10T428/24496; Y10T428/24504; Y10T428/26; Y10T428/268; Y10T428/31
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
17 words
The thermoplastic film of claim 1 having an oxygen permeability of 3,000 to 10,000,000 cc./100 sq.in./24 hrs./atmosphere/mil.
Claim 2
Dependent Claim
22 words
The thermoplastic film of claim 1 wherein the tear propagation strength in each direction of stretch is at least about 2.5 g./mil.
Claim 3
Dependent Claim
13 words
The thermoplastic film of claim 1 wherein the cellular polymer matrix is polyethylene.
Claim 4
Dependent Claim
13 words
The thermoplastic film of claim 1 wherein the cellular polymer matrix is polypropylene.
Claim 5
Dependent Claim
44 words
The thermoplastic film of claim 5 wherein the film has a Mullen burst strength of at least about 40 pounds, a Clark stiffness of at least about 20, and a modulus of elasticity of at least about 115 Kpsi in each direction of stretch.
Claim 6
Dependent Claim
15 words
The thermoplastic film of claim 1 wherein the cellular polymer matrix is an ethylene/octene polymer.
Claim 7
Dependent Claim
44 words
The thermoplastic film of claim 7 wherein the film has a Mullen burst strength of at least about 40 pounds, a Clark stiffness of at least about 15, and a modulus of elasticity of at least about 126 Kpsi in each direction of stretch.
Claim 8
Dependent Claim
12 words
The thermoplastic film of claim 1 wherein the inert filler is clay.
Claim 9
Dependent Claim
14 words
The thermoplastic film of claim 1 wherein the inert filler is calcined kaolin clay.
Claim 10
Dependent Claim
15 words
The thermoplastic film of claim 1 having a density of about 0.3 to 0.7 g./cc.
Claim 11
Dependent Claim
20 words
The thermoplastic film of claim 1 having about 40 to 70% voids and a TAPPI opacity of at least 85%.
Claim 12
Dependent Claim
14 words
The thermoplastic film of claim 1 having a differential oxygen permeability through the film.
Claim 13
Dependent Claim
163 words
A BIAXIALLY STRETCHED THERMOPLASTIC FILM CONSISTING OF: A. A CELLULAR POLYMER MATRIX PREPARED FROM A POLYMER HAVING A CRYSTALLINITY OF AT LEAST ABOUT 60 AT ROOM TEMPERATURE TAKEN FROM THE GROUP CONSISTING OF HOMOPOLYMERS, COPOLYMERS, AND BLENDS THEREOF, OF A-OLEFINS HAVING TWO TO TEN CARBON ATOMS, HAVING DISPERSED THEREIN B. ABOUT 26 TO 50 WEIGHT PERCENT OF AN INERT INORGANIC FILLER, BASED ON THE WEIGHT OF POLYMER AND FILLER, HAVING AN AVERAGE PARTICLE SIZE OF ABOUT 0.3 TO 8 MICRONS, WHEREIN THE FILLED POLYMER HAS AN ELONGATION OF AT LEAST ABOUT 1000 AT A TEMPERATURE WITHIN THE RANGE WHICH IS ABOVE THE LINE-DRAWING TEMPERATURE AND BELOW THE MELTING TEMPERATURE OF THE POLYMER, SAID FILM HAVING A VOID CONTENT OF AT LEAST ABOUT 30 TO 70, AN ELONGATION AT BREAK AT 22*C. OF AT LEAST ABOUT 8 IN EACH DIRECTION OF STRETCH, AN OXYGEN PERMEABILITY OF ABOUT 900 TO 10,000,000 CC./100 SQ. IN./24 HRS./ATMOSPHERE/MIL AND ABOUT TWO TO 40 SURFACES RUPTURES PER SQUARE MILLIMETER.
Claim 14
Dependent Claim
14 words
The thermoplastic film of claim 14 also containing a pigment, dye, or antistatic agent.
Claim 15
Dependent Claim
14 words
The thermoplastic film of claim 15 also containing a pigment, dye, or antistatic agent.
Claim 16
Dependent Claim
13 words
The thermoplastic film of claim 15 wherein the inert filler is kaolin clay.
References Cited (Backward Citations)
CA857223A
Cited
US3154461A
Cited
US3634564A
Cited
FR2012460A1
Cited
US3775521A
Cited
US3725520A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |