Transfer metallizing film

• US 4,777,081 A
• Filed: 09/12/1985
• Issued: 10/11/1988
• Est. Priority Date: 09/19/1984
• Status: Expired due to Fees

• Current Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Original Assignee: Hoechst Aktiengesellschaft (Sanofi )
• Inventors: Bothe, Lothar, Crass, Guenther, Paschke, Klaus
• Primary Examiner(s): Ives, P. C.
• Application Number:
  US06/775,329
• Time in Patent Office: 1,125 Days
• Field of Search: 428/516, 428/215, 428/330, 428/331, 428/461, 428/451, 428/476.9
• US Class Current: 428/215
• CPC Class Codes: B32B 2307/518 bi-axially
• CPC Class Codes: B32B 2323/10 Polypropylene
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: C23C 14/0005 Separation of the coating from the substrate
• CPC Class Codes: H05K 3/025 by transfer of thin metal foil formed on a temporary carrier, e.g. peel-apart copper
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/1438 Metal containing
• CPC Class Codes: Y10T 428/24967 Absolute thicknesses specified
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31667 Next to addition polymer from unsaturated monomers, or aldehyde or ketone condensation product
• CPC Class Codes: Y10T 428/31692 Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31703 Next to cellulosic
• CPC Class Codes: Y10T 428/31757 Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 428/31913 Monoolefin polymer

Abstract

A biaxially oriented transfer metallizing film based on polypropylene, and process therefor. The film is a three-layer film produced by coextrusion and having a base layer of a propylene homopolymer and top layers applied to the two surfaces thereof. The base layer contains an additive depot of migrating monomers in an amount of 0.01 to 2.0 percent by weight, relative to the weight of the polymer constituting the base layer. The top layers are polypropylene that has a lower viscosity than the polypropylene of the base layer.

Claims

1. A biaxially oriented three-layer transfer metallizing film, comprising:

a propylene homopolymer base layer containing an additive depot of migrating monomers, said migrating monomers (a) being present in an amount of from about 0.01 to about 2.0% by weight relative to the weight of said propylene homopolymer and (b) comprising a mixture of stearic acid amide and a hydroxyethylalkylamine that comprises an alkyl group containing 14 to 30 carbon atoms; and

a separate top layer applied on each side of said base layer, each said top layer consisting essentially of polypropylene having a viscosity lower than that of said base layer, such that migrating monomers move from said base layer into at least one of said top layers.

2. A metallizing film as claimed in claim 1, wherein the quantity of said migrating monomers contained in the base layer is from about 0.01 to about 1.0 percent by weight of said propylene homopolymer.

3. A metallizing film as claimed in claim 1, wherein said film has a total thickness of from about 15 to about 30 μ

m.

4. A metallizing film as claimed in claim 1, wherein said top layers each have a thickness of from about 0.3 to about 5.0 μ

m.

5. A metallizing film as claimed in claim 1, wherein the polypropylene forming the base layer has a melt flow index 230/5 of from about 5 to about 20 g/10 min. and the polypropylene forming the top layers has a melt flow index 230/5 of from about 15 to about 30 g/10 min.

6. A metallizing film as claimed in claim 1, wherein said top layers contain an inert admixture which improves the slip properties or blocking resistance of the film, said admixture including compounds selected from the group consisting of calcium carbonate, barium sulfate, silicon dioxide and aluminum silicate, said admixture present in an amount of from 0.1 to 1.0 percent by weight, relative to the weight of the polymer constituting the top layers.

7. A metallizing film as claimed in claim 1, wherein the top layers contain aluminum silicate in an amount of from about 0.2 to about 0.6 percent by weight, relative to the weight of the polymer constituting the top layers.

8. A metallizing film as claimed in claim 1, wherein the quantity of said migrating monomers contained in the base layer is from about 0.1 to about 0.5 percent by weight of said propylene homopolymer.

9. A metallizing film as claimed in claim 1, wherein said film has a total thickness of from about 20 to about 25 μ

m.

10. A metallizing film as claimed in claim 1, wherein said top layers each have a thickness of from about 0.5 to about 1.5 μ

m.

11. A biaxially oriented transfer metallizing film, comprising:

(a) a propylene homopolymer base layer;

(b) at least one top layer applied over said base layer, said top layer consisting essentially of a propylene homopolymer and receiving a quantity of at least one migrating compound from said base layer;

(c) an outer metal layer applied over said at least one top layer;

(d) a first quantity of at least one compound capable of migrating from said base layer, said first quantity of migrating compound being contained in said top layer and being at least partially depleted from said top layer by transfer of said metal layer, said compound comprising a mixture of stearic acid amide and a hydroxyethylalkylamine that comprises an alkyl group containing 14 to 30 carbon atoms;

(e) a second quantity of at least one migrating compound contained in said base layer, said second quantity being capable of migrating from said base layer to said top layer to replenish said first quantity upon transfer of said metal layer, said second quantity being comprised of a mixture of stearic acid amide and a hydroxyethylalkylamine that comprises an alkyl group containing 14 to 30 carbon atoms.

12. A metallizing film as claimed in claim 11, wherein said film includes an outer metal layer applied on both sides of said film.

13. A metallizing film as claimed in claim 11, wherein said film includes a said top layer on each side of said base layer, each said top layer having a viscosity lower than that of said base layer.

14. A metallizing film as claimed in claim 13, wherein said film includes an outer metal layer applied over each said top layer.

15. A metallizing film as claimed in claim 14, wherein each of said top layers contains a second quantity of migrating compound.

16. A metallizing film as claimed in claim 11, wherein said base layer contains a mixture of stearic acid amide and a hydroxyethylalkylamine having alkyl groups of from 14 to 30 carbon atoms, said mixture being present in an amount of from about 0.01 to about 2.0% by weight relative to the weight of said propylene homopolymer in said base layer.

17. A metallizing film as claimed in claim 11, wherein said at least one top layer includes an inert admixture for improving the slip properties or blocking resistance of said top layer.