# US 7,410,675 B2 · Transparent, biaxially orientated polyolefinic film with improved bonding properties

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- Number: US 7,410,675 B2
- Document ID: US7410675B2
- Status: Granted
- Kind: B2
- Application number: 10/275,512
- Filed: 2001-05-09
- Published: 2003-06-05
- Granted: 2008-08-12
- Earliest claimed: 2000-05-09
- Assignees: Trespaphan GmbH
- Inventors: Detlef Busch; Joachim Jung
- Web page: https://patentgrep.com/patent/US7410675B2

## CPC

- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B29C 59/08: by flame treatment {; using hot gases}
- B29C 59/10: by electric discharge treatment
- B29C 59/14: by plasma treatment {(plasma tubes per se H01J)}
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)

## Abstract

The invention relates to the use of a polyolefinic film, with at least one layer, which is made from polyolefinic polymers, whereby said polyolefinic film comprises a bonding layer as outer layer. Said bonding layer contains at least 50 wt. % based on the weight of the layer of a maleic anhydride modified polyolefin. The film is used for printing, metallising or coating.

## Claims

### Claim 1

Method for printing a co-extruded polyolefin film, said polyolefin film comprising a base layer and a first outer layer, both base and first outer layers having first and second surfaces, said first surface of said first outer layer disposed on said first surface of said base layer, wherein said base layer is built up from polyolefinic polymers and said first outer layer comprises a single polymer consisting entirely of a maleic anhydride-modified polyolefin, said method consisting essentially of
applying a first surface treatment to said second surface of said first outer layer by plasma, corona or flame-treating said second surface of said first outer layer during film manufacturing;
applying a second surface treatment to said second surface of said first outer layer by applying a plasma, corona or flame treatment to said second surface of said first outer layer subsequent to said first surface treatment; and
printing the second surface of said first outer layer subsequent to said second surface treatment,
wherein (i) the surface tension imparted by the first surface treatment is the same as the surface tension imparted by the second surface treatment,
(ii) printing adhesion is enhanced by said first and second surface treatments alone,
(iii) said film is formed using a longitudinal stretching ratio ranging from 4 to 8 and a transverse stretching ratio ranging from 5 to 10 and
(iv) the surface tension imparted by the first and second surface treatments ranges from 42 to 50 mN/m.

### Claim 2 (depends on 1)

Method according to claim 1, wherein the printing on the second surface of said first outer layer is carried out by means of water-based printing inks.