Patent US4725466A successfully refreshed from Google Patents.
US4725466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-sealable, biaxially oriented multi-layer polypropylene film
Assignee: Hoechst AG
•
Filing: 1986-05-15
•
Granted: 1988-02-16
•
Expires: 2006-05-15
Abstract
Abstract A non-sealable polypropylene multi-layer film comprises a base layer and at least one covering layer, the base layer as wella as the covering layer or layers being formed of propylene homopolymers. The covering layers contain a combination of additives composed of (a) from 0.2 to 1.0% by weight of a long-chain aliphatic amine, (b) from 0.2 to 1.0% by weight of a polydialkylsiloxane, and (c) from 0.1 to 1.0% by weight of a platelet-shaped inorganic pigment, the platelets of the pigments being disposed substantially parallel to the surface of the covering layer. The film is preferably produced by a coextrusion process. It is preferably used as a laminating film, an interleaving film or a metallizable film. The novel non-sealable polypropylene multi-layer film has, in particular, good anti-blocking and slip properties, good optical properties, good antistatic properties, and a high scratch resistance. The film can be subjected to a corona treatment without thereby adversely influencing its properties.
Inventors
- 👤 Guenther Crass
- 👤 Lothar Bothe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:51
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B27/20; B32B38/00; B32B38/0008; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2310/00; B32B2310/14; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/25; Y10T428/259; Y10T428/28; Y10T428/2848; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A non-sealable, biaxially oriented multi-layer film, comprising: (a) a polypropylene homopolymer base layer; and (b) at least one covering layer positioned over said base layer, said covering layer comprising on a total weight basis: (1) from about 0.2% to about 1.0% by weight of an aliphatic amine; (2) from about 0.2% to about 1.0% by weight of a polydialkylsiloxane; (3) from about 0.1% to about 1.0% by weight of a platelet-shaped inorganic pigment comprising a platelet-shaped calcium carbonate or magnesium carbonate or a platelet-shaped aluminum silicate; and (4) the balance being a propylene homopolymer; wherein the platelets of said pigment are disposed substantially parallel to a surface of said covering layer.
Claim 2
Dependent Claim
111 words
A non-sealable, biaxially oriented multi-layer film, comprising: (a) a polypropylene homopolymer base layer; and (b) at least one covering layer positioned over said base layer, said covering layer comprising on a total weight basis: (1) from about 0.2% to about 1.0% by weight of an aliphatic amine; (2) from about 0.2% to about 1.0% by weight of a polydialkylsiloxane; (3) from about 0.1% to about 1.0% by weight of a platelet-shaped inorganic pigment comprising a platelet-shaped calcium carbonate or magnesium carbonate or a platelet-shaped aluminum silicate; and (4) the balance being a propylene homopolymer; wherein the platelets of said pigment are disposed substantially parallel to a surface of said covering layer.
Claim 3
Dependent Claim
22 words
A film as claimed in claim 1, wherein the amount of said polydialkylsiloxane is from about 0.4% to about 0.7% by weight.
Claim 4
Dependent Claim
62 words
A film as claimed in claim 1, wherein said propylene homopolymer base layer comprises an isotactic polypropylene with an n-heptane-soluble amount of not more than about 15% by weight, a melting point of at least about 150° C. and a melt index of from about 0.5 g to about 8 g/10 min at 230° C. and under a load of 21.18 N.
Claim 5
Dependent Claim
39 words
A film as claimed in claim 1, wherein the melt flow index of said propylene homopolymer in said cover layer is from about 1 to about 9 g/10 min at 230° C. and under a load of 21.18 N.
Claim 6
Dependent Claim
23 words
A film as claimed in claim 1, wherein said aliphatic amine comprises an N,N-bis-(hydroxy-C2 to C 4 -alkyl)-C 12 to C 18 -alkylamine.
Claim 7
Dependent Claim
30 words
A film as claimed in claim 1, wherein said polydialkylsiloxane comprises a polydi(Cl to C4) alkylsiloxane having a viscosity of from about 1,000 to about 100,000 mm2/s at 25° C.
Claim 8
Dependent Claim
54 words
A film as claimed in claim 1, wherein the platelets have an aspect ratio of from about 2 to about 20 and wherein the average particle size is from about 0.1 to about 4 μm, the largest particle being less than about 20 μm and the smallest particle being greater than about 0.01 m.
Claim 9
Dependent Claim
18 words
A film as claimed in claim 7, wherein said aspect ratio is from about 4 to about 10.
Claim 10
Dependent Claim
17 words
A film as claimed in claim 1, said film comprising a base layer and two covering layers.
Claim 11
Dependent Claim
31 words
A film as claimed in claim 1, wherein said film includes two covering layers, and wherein both said covering layers contain said aliphatic amine, said polydialkylsiloxane and said platelet-shaped inorganic pigment.
Claim 12
Dependent Claim
34 words
A film as claimed in claim 1, wherein said film is from about 8 to about 50 /um thick, the thickness of one said covering layer being from about 0.1 to about 2 μm.
Claim 13
Dependent Claim
13 words
A laminating film formed from the multilayer film as claimed in claim 1.
Claim 14
Dependent Claim
13 words
An interleaving film formed from the multilayer film as claimed in claim 1.
Claim 15
Dependent Claim
13 words
A bag film formed from the multi-layer film as claimed in claim 1.
Claim 16
Dependent Claim
16 words
A base film for adhesive tapes formed from the multi-layer film as claimed in claim 1.
Claim 17
Dependent Claim
13 words
A metallizable film formed from the multilayer film as claimed in claim 1.
Claim 18
Dependent Claim
14 words
A transfer metallizable film formed from the multi-layer film as claimed in claim 1.
References Cited (Backward Citations)
US4348457A
Cited
EP0124310A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-15 | 1991-08-17 | 1992-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-15 | 1995-08-17 | 1996-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-15 | 1999-08-17 | 2000-02-16 | $7700.00 | Window Closed / Lapsed |