Metal bond strength in polypropylene films

Details Metal bond strength in polypropylene films Metal bond strength in polypropylene films

2006-04-11

2006-04-11

Jackson, Monique R. (Department: 1773)

Stock material or miscellaneous articles

Composite

Of metal

C428S457000, C428S500000, C428S515000, C428S516000

Reexamination Certificate

active

07026055

ABSTRACT:
The present invention relates to the improvement of metal bond strength in polypropylene films surface treated at higher levels through the addition to the basic isotactic polypropylene (iPP) polymer of an amount of syndiotactic polypropylene (sPP) in an amount no more than about 10 percent by weight and preferably in an amount between about 0.5 percent and about 8 percent by weight. The invention encompasses both the resulting metallized polypropylene films with enhanced bond strength and the process for producing such films. The prescribed use provides improved bonding properties over a simple non-blended isotactic polypropylene homopolymer, while maintaining at acceptable levels the optical and physical characteristics of a film made from non-blended iPP homopolymer. At increasing percentages of sPP above the preferred levels, bond strength continues to increase, but a deterioration in other properties may be noted, particularly in the optical property haze.

REFERENCES:
patent: 3620825 (1971-11-01), Lohmann et al.
patent: 5691043 (1997-11-01), Keller et al.
patent: 6407177 (2002-06-01), Shamshoum et al.

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