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US 6,432,527 B1Granted
Embossed film having controlled tear
Assignee3M Innovative Properties Company
InventorsMario A. Perez, Michael D. Swan, Robert J. Maki
Life of this patent
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Abstract
This invention relates to an oriented embossed film, which may be used as a backing in an adhesive tape. The film is easily and readily hand-tearable without the use of cutting tools or a dispenser and provides a substantially straight, non-curling edge when torn.
Claims32
An embossed, uniaxially oriented film comprising a polymer blend of:
- a major amount of a semi-crystalline first polymer component, and
- a minor amount of a second polymer component having a yield point less than that of the first polymer component, and
- an embossed pattern providing predetermined tearability in a direction substantially transverse to the direction of orientation.
A process for preparing an embossed, oriented film that comprises:
- providing a film comprising a melt-processed mixture comprising a semicrystalline first polymer component and a second polymer component having a yield point less than the first polymer component, orienting said film, and embossing at least one major surface of the oriented film with a predetermined pattern to impart tearability in a direction substantially transverse to the direction of orientation.
Dependencies are inferred from the claim text.