US4592938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing an internally reinforced thermoplastic film and film and articles produced therefrom
Assignee: Mobil Oil AS
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Filing: 1985-03-25
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Granted: 1986-06-03
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Expires: 2005-03-25
Abstract
Abstract A method for producing an internally reinforced aeolotropic thermoplastic film web through coextrusion of two polymeric materials, and more particularly, a method of forming a film web possessing an enhanced tensile strength in at least the longitudinal or machine direction of the film web. A plastic film having internal striplike reinforcements entirely embedded within a matrix material is formed by the inventive method, and such film is utilized for various articles; for instance, plastic bags, bag components such as handles by liners, stretch wrap film, and the like.
Inventors
- 👤 Gordon L. Benoit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:22
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/09; B29C48/10; B29C48/07; B29C48/08; B31; B31B; B31B70/00; B31B70/008; B29C48/16; B29C48/18; B29C48/19; B29C48/20; B29K; B29K2023/00; B29K2023/04; B29K2023/06; B31B70/74; B31B70/86; B31B70/876; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1345; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249942; Y10T428/249947
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
98 words
An internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins having an increased tear resistance and tensile strength in at least the longitudinal or machine direction of said film web; comprising: (a) a first thermoplastic resin forming a matrix for said thermoplastic film web; and (b) a plurality of discrete parallel spaced continuous strips or stripes of a second thermoplastic resin embedded entirely within the confines of said first film web-forming thermoplastic matrix and extending in the machine direction of said film web to constitute said internally reinforced aeolotropic thermoplastic film having said increased tensile strength.
Claim 2
Dependent Claim
98 words
An internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins having an increased tear resistance and tensile strength in at least the longitudinal or machine direction of said film web; comprising: (a) a first thermoplastic resin forming a matrix for said thermoplastic film web; and (b) a plurality of discrete parallel spaced continuous strips or stripes of a second thermoplastic resin embedded entirely within the confines of said first film web-forming thermoplastic matrix and extending in the machine direction of said film web to constitute said internally reinforced aeolotropic thermoplastic film having said increased tensile strength.
Claim 3
Dependent Claim
21 words
A film web as claimed in claim 1, wherein said first and second thermoplastic resins are each constituted of a polyolefin.
Claim 4
Dependent Claim
42 words
A film web as claimed in claim 1, wherein the matrix of said film web is constituted of polyethylene, and said strips or stripes embedded within said film are constituted of a polyethylene having a greater tensile strength than said polyethylene film.
Claim 5
Dependent Claim
28 words
A film web as claimed in claim 3, wherein said thermoplastic strips or stripes are constituted of a higher-tensile strength polyethylene than the polyethylene material of said matrix.
Claim 6
Dependent Claim
38 words
A film web as claimed in claim 1, wherein said film web is a flat extruded film, and said strips or stripes are spaced within said film matrix and extend in the machine direction of said film web.
Claim 7
Dependent Claim
37 words
A film web as claimed in claim 1, wherein said film web is a tubular film, said strips or stripes being spaced about the circumference of said film and extending in the machine direction of the film.
Claim 8
Dependent Claim
22 words
A film web as claimed in claim 1, wherein said internally reinforced aeolotropic thermoplastic film is utilized in producing plastic bag structures.
Claim 9
Dependent Claim
24 words
A film web as claimed in claim 7, wherein said internally reinforced aeolotropic thermoplastic film is incorporated in handle portions of said bag structures.
Claim 10
Dependent Claim
20 words
A film web as claimed in claim 1, wherein said internally reinforced aeolotropic thermoplastic film is formed into bag liners.
Claim 11
Dependent Claim
19 words
A film web as claimed in claim 1, wherein said film is formed into a stretch wrap film web.
Claim 12
Independent Claim
126 words
A method of producing an internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins, said film having an increased tensile strength in at least the longitudinal or machine direction of said film web; comprising the steps of: (a) extruding a first thermoplastic resin through an extrusion die orifice so as to form said resin into a matrix for said thermoplastic film web; (b) concurrently extruding a plurality of discrete continuous strips or stripes of a second thermoplastic resin through said die orifice, said strips extending in parallel spaced relationship in the machine direction of said film web, and said strips being embedded entirely within the confines of said first film web-forming thermoplastic matrix so as to produce said internally reinforced aeolotropic thermoplastic film web.
Claim 13
Independent Claim
126 words
A method of producing an internally reinforced aeolotropic thermoplastic film web constituted of coextruded thermoplastic resins, said film having an increased tensile strength in at least the longitudinal or machine direction of said film web; comprising the steps of: (a) extruding a first thermoplastic resin through an extrusion die orifice so as to form said resin into a matrix for said thermoplastic film web; (b) concurrently extruding a plurality of discrete continuous strips or stripes of a second thermoplastic resin through said die orifice, said strips extending in parallel spaced relationship in the machine direction of said film web, and said strips being embedded entirely within the confines of said first film web-forming thermoplastic matrix so as to produce said internally reinforced aeolotropic thermoplastic film web.
Claim 14
Dependent Claim
19 words
A method as claimed in claim 11, wherein said first and second thermoplastic resins are constituted of a polyolefin.
Claim 15
Dependent Claim
41 words
A method as claimed in claim 11, wherein the matrix of said film web is constituted of polyethylene, and said strips or stripes embedded within said film are constituted of a polyethylene having a greater tensile strength than said polyethylene film.
Claim 16
Dependent Claim
26 words
A method as claimed in claim 13, wherein said thermoplastic strips are constituted of a higher tensile strength polyethylene than the polyethylene material of said matrix.
Claim 17
Dependent Claim
38 words
A method as claimed in claim 11, wherein said film web a flat extruded film, and strips are spaced across the width of said film matrix and extend in parallel along the machine direction of said film web.
Claim 18
Dependent Claim
36 words
A method as claimed in claim 11, wherein said film web is a tubular film, said strips being spaced about the circumference of said film and extending in parallel along the machine direction of said film.
Claim 19
Dependent Claim
21 words
A method as claimed in claim 11, wherein said internally reinforced aeolotropic thermoplastic film is utilized in producing plastic bag structures.
Claim 20
Dependent Claim
31 words
A method as claimed in claim 17, wherein said internally reinforced aeolotropic thermoplastic film has said strips extending along handle portions of said bag structures to form reinforcements along the handles.
Claim 21
Dependent Claim
20 words
A method as claimed in claim 11, wherein said internally reinforced aeolotropic thermoplastic film is formed into a bag liners.
Claim 22
Dependent Claim
23 words
A method as claimed in claim 11, wherein said internally reinforced aeolotropic thermoplastic film is formed into a a stretch wrap film web.
References Cited (Backward Citations)
US3034941A
Cited
US3397428A
Cited
US3372920A
Cited
US3577308A
Cited
US4410602A
Cited
US4464157A
Cited
US4410587A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |