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US4997700A
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Biaxially oriented polypropylene film for metallizing applications
Assignee: Hoechst AG
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Filing: 1989-09-27
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Granted: 1991-03-05
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Expires: 2009-09-27
Abstract
Abstract A metallizable, heat-sealable, biaxially oriented multi-layer film for metallizing applications is described which comprises a base layer comprising polypropylene, a first polyolefinic heat-sealable surface layer and a second polyolefinic metallizable surface layer. The second polyolefinic metallizable surface layer comprises a propylene-ethylene copolymer, which has an ethylene content of 1.2 to 2.8% by weight, a distribution factor V F greater than 10, an enthalpy of fusion Δ H m greater than 90 J/g and a thermo-oxidation temperature T ox greater than 240° C.
Inventors
- 👤 Lothar Bothe
- 👤 Gunter Schloegl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:24
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B27/18; B32B2255/00; B32B2255/10; B32B2255/20; B32B2255/205; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2311/00; B32B2311/24; B32B2323/00; B32B2323/04; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/25; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31703; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
72 words
A metallizable, heat-sealable, biaxially oriented multi-layer film for metallizing applications comprising a base layer comprising polypropylene, a first polyolefinic heat-sealable surface layer and a second polyolefinic metallizable surface layer comprising a propylene-ethylene copolymer which has an ethylene content of 1.2 to 2.8% by weight, a distribution factor V F greater than 10, an enthalpy of fusion ΔH m greater than 90 J/g and a thermooxidation temperature T ox greater than 240° C.
Claim 2
Dependent Claim
72 words
A metallizable, heat-sealable, biaxially oriented multi-layer film for metallizing applications comprising a base layer comprising polypropylene, a first polyolefinic heat-sealable surface layer and a second polyolefinic metallizable surface layer comprising a propylene-ethylene copolymer which has an ethylene content of 1.2 to 2.8% by weight, a distribution factor V F greater than 10, an enthalpy of fusion ΔH m greater than 90 J/g and a thermooxidation temperature T ox greater than 240° C.
Claim 3
Dependent Claim
62 words
A film as claimed in claim 1, wherein the copolymer of said second polyolefinic surface layer has an ethylene content of 1.4 to 1.8% by weight, a distribution factor V F of more than 15, an enthalpy of fusion ΔH m in the range of from about 95 to 110 J/g and a thermo-oxidation temperature T ox of more than 245° C.
Claim 4
Dependent Claim
29 words
A film as claimed in claim 1, wherein said copolymer of said second polyolefinic metallizable surface layer has a melt flow index between about 3 and 12 g/10 min.
Claim 5
Dependent Claim
34 words
A film as claimed in claim 1, wherein said film has a total thickness of between about 10 and 70 μm, the surface layers each having a thickness of about 0.5 to 1 μm.
Claim 6
Dependent Claim
19 words
A film as claimed in claim 4, wherein said film has a total thickness of 15 to 50 μm.
Claim 7
Dependent Claim
67 words
A film as claimed in claim 1, wherein the first polyolefinic heat-sealable surface layer further comprises an antiblocking agent in an amount in the range of from about 0.1 to 1% by weight, relative to the weight of the surface layer, the antiblocking agent having an average particle diameter in the range of from about 1 to 4 μm and a shape ratio of less than 3.
Claim 8
Dependent Claim
19 words
A film as claimed in claim 6, wherein spherical inorganic or organic particles are used as said anti-blocking agent.
Claim 9
Dependent Claim
58 words
A film as claimed in claim 1, wherein said second polyolefinic metallizable surface layer further comprises as a stabilizer a polynuclear, sterically hindered phenol in an amount in the range of from about 0.2 to 0.6% by weight, relative to the total weight of the surface layer, the molecular weight of said stabilizer being greater than 300 g/mol.
Claim 10
Dependent Claim
40 words
A film as claimed in claim 8, wherein said stabilizer has a molecular weight of more than 700 g/mol and is used in an amount of 0.3 to 0.4% by weight, relative to the total weight of the surface layer.
Claim 11
Dependent Claim
27 words
A film as claimed in claim 1, wherein said film has a metallization layer on its second polyolefinic metallizable surface layer deposited by vacuum evaporation of aluminum.
Claim 12
Dependent Claim
19 words
A film as claimed in claim 10, wherein said metallization layer is deposited by vacuum evaporation of a metal.
Claim 13
Dependent Claim
12 words
A film as claimed in claim 11, wherein said metal is aluminum.
Claim 14
Dependent Claim
25 words
A metallized film as claimed in claim 10, wherein the free side external to said metallization layer bears a protective coating made from a polyolefin.
Claim 15
Dependent Claim
14 words
A metallized film as claimed in claim 13, wherein the protective coating comprises polyethylene.
Claim 16
Dependent Claim
19 words
A composite material comprising a transparent or opaque plastic film and a metallized film as claimed in claim 13.
Claim 17
Dependent Claim
16 words
A composite material comprising a paper layer and a metallized film as claimed in claim 13.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |