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US 8,075,985 B2Granted
Metallized biaxially oriented polypropylene film with high metal adhesion
AssigneeToray Plastics (America), Inc.
InventorsMark S. Lee, Tien-Kuei Su
Life of this patent
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Abstract
Described are laminate films including a polyolefin base layer, and a metal receiving layer including a blend of propylene homopolymer or mini-random propylene-ethylene copolymer, and an amorphous poly-alpha-olefin or ethylene-propylene elastomer. The metal receiving layer may also include an ethylene-propylene copolymer. The laminate film may also include additional layers such as an additional polyolefin resin-containing layer, a metal layer, or combinations thereof.
Claims34
A laminate film comprising:
- a polyolefin base layer;
- and
- a metal receiving layer comprising a blend of propylene homopolymer or mini-random propylene-ethylene copolymer, and an amorphous poly-alpha-olefin having a molecular weight of 130,000 to 170,000 g/mol, wherein a surface of the metal receiving layer that is to receive a metal layer is corona discharge treated in a controlled atmosphere of CO2 and N2 that excludes O2 and the corona discharge treated surface comprises nitrogen-bearing functional groups comprising at least 0.3% nitrogen in atomic %.
A laminate film comprising:
- a polyolefin base layer;
- and
- a metal receiving layer comprising a blend of propylene homopolymer or mini-random propylene-ethylene copolymer, and an ethylene-propylene elastomer having a density of 0.876 g/cm3 or less, wherein a surface of the metal receiving layer that is to receive a metal layer is corona discharge treated in a controlled atmosphere of CO2 and N2 that excludes O2 and the corona discharge treated surface comprises nitrogen-bearing functional groups comprising at least 0.3% nitrogen in atomic %.
Dependencies are inferred from the claim text.