Patent US5118566A successfully refreshed from Google Patents.
US5118566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biaxially-oriented polypropylene film with high mechanical strength
Assignee: Hoechst AG
•
Filing: 1990-06-22
•
Granted: 1992-06-02
•
Expires: 2010-06-22
Abstract
Abstract A biaxially-oriented film with high mechanical strength, which includes 69 to 94.99% by weight of a polyolefin, 5 to 30% by weight of a natural or synthetic resin having a softening point in the range from 70° to 170° C., and 0.01 to 1% by weight of a nucleating agent, based on the total weight of the film. A method for producing this film includes biaxially drawing the film at temperatures below the melting point of the polyolefin.
Inventors
- 👤 Thomas Wilhelm
- 👤 Lothar Bothe
- 👤 Guenther Crass
- 👤 Gunter Schloegl
- 👤 Winfried Muskalla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:02
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/0008; C08K5/0083; C08L; C08L23/00; C08L23/02; C08L23/10; C09; C09J; C09J7/00; C09J7/20; C09J7/22; C09J7/24; C09J7/241; C08J2323/00; C08J2323/02; C08L21/00; C08L7/00; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/26; Y10T428/269; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
4 words
A biaxially-oriented film comprising
Claim 2
Dependent Claim
4 words
A biaxially-oriented film comprising
Claim 3
Dependent Claim
53 words
about 69 to 94.99% by weight of a polyolefin, about 5 to 30% by weight of a natural or synthetic resin having a softening point in the range from about 70° to 170° C., and about 0.01 to 1% by weight of a nucleating agent, based on the total weight of the film.
Claim 4
Dependent Claim
53 words
about 69 to 94.99% by weight of a polyolefin, about 5 to 30% by weight of a natural or synthetic resin having a softening point in the range from about 70° to 170° C., and about 0.01 to 1% by weight of a nucleating agent, based on the total weight of the film.
Claim 5
Dependent Claim
13 words
A film as recited in claim 1, wherein said polyolefin comprises a polypropylene.
Claim 6
Dependent Claim
19 words
A film as recited in claim 2, wherein said polypropylene has an isotactic fraction of more than about 92%.
Claim 7
Dependent Claim
55 words
A film as recited in claim 1, wherein said resin comprises at least one member selected from the group consisting of a non-hydrogenated styrene polymer, a methylstyrene-styrene copolymer, a pentadiene or cyclopentadiene copolymer, an alpha-or beta-pinene polymer, a colophony or colophony derivative, a terpene polymer or a hydrogenated compound thereof, and a hydrogenated alpha-methylstyrene-vinyltoluene copolymer.
Claim 8
Dependent Claim
32 words
A film as recited in claim 1, wherein said nucleating agent comprises a substance which reduces the crystallization half-time (t 1/2 ) by at least 25%, as determined by differential scanning calorimetry.
Claim 9
Dependent Claim
49 words
A film as recited in claim 5, wherein said nucleating agent comprises at least one organic substance selected from the group consisting of a dibenzylidene sorbitol or a chemically-modified derivative of dibenzylidene sorbitol, a sodium-bis (4-tert-butylphenyl)phosphate, a metal salt of benzoic acid and a quinacridone or a quinacridone derivative.
Claim 10
Dependent Claim
28 words
A film as recited in claim 5, wherein said nucleating agent comprises at least one inorganic substance selected from the group consisting of talcum, silicon dioxide and bentonite.
Claim 11
Dependent Claim
19 words
A film as recited in claim -, wherein said film has a thickness from about 8 to 50 μm.
Claim 12
Dependent Claim
19 words
A film as recited in claim 8, wherein said film has a thickness from about 15 to 40 μm.
Claim 13
Dependent Claim
23 words
A film as recited in claim 1, further comprising at least one covering layer disposed on at least one surface of said film.
Claim 14
Dependent Claim
30 words
A film as recited in claim 10, wherein said covering layers include at least one component selected from the group consisting of an anti blocking agent and an antistatic agent.
Claim 15
Dependent Claim
26 words
An adhesive tape having a base film comprised of a film according to claim 1 and at least one adhesive layer applied to the base film.
Claim 16
Dependent Claim
75 words
A film as recited in claim 1, produced by a method consisting essentially of the steps of: (a) extruding a mixture comprising said polyolefin, said natural or synthetic resin having a softening point in the range from abut 70° to 170° C. and said nucleating agent to form a melt; (b) cooling said melt to form a polymer sheet; and subsequently (c) biaxially drawing said sheet at temperatures below the melting point of said polyolefin.
Claim 17
Dependent Claim
46 words
A film as recited in claim 13, wherein step (c) comprises longitudinally drawing said sheet by a factor of at least about 6 and then transversely drawing said sheet such that the product of the longitudinal and transverse draw rations is from about 40 to 72.
Claim 18
Dependent Claim
37 words
A film as recited in claim 13, wherein said method further comprises the steps of applying an adhesive layer on at least one side of said film and thereafter heating the film to dry said adhesive layer.
Claim 19
Dependent Claim
13 words
A film as recited in claim 3, wherein said polypropylene is a homopolymer.
Claim 20
Dependent Claim
16 words
A film as recited in claim 2, wherein said polypropylene comprises a bock or random copolymer.
Claim 21
Dependent Claim
11 words
A packaging material comprising a film as claimed in claim 1.
Claim 22
Dependent Claim
20 words
A film as recited in claim 2, wherein said resin comprises hydrogenated polycyclopentadiene and said nucleating agent comprises dibenzylidene sorbitol.
Claim 23
Dependent Claim
18 words
A film as recited in claim 2, consisting essentially of said polypropylene, said resin, and said nucleating agent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |