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US 6,444,301 B1Granted
Labels
AssigneeHoechst Trespaphan GmbH
InventorsPaul Malcolm Mackenzie Davidson, Rebecca Karen Govier, Helen Ann Biddiscombe, Marc Fritz Manfred Ott
Life of this patent
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Abstract
Polymeric films including a layer of propylene resin having microvoids therein, the microvoids having been formed by stretching a web containing the beta-form of polypropylene, have shown low static cling when being unwound from rolls in labelling operations and also during destacking of pre-formed labels. The invention provides labels formed from such films.
Claims20
A process for producing a polymeric label, comprising:
- (a) forming a film by extruding a melt of propylene homopolymer and a beta-form nucleating agent;
- (b) cooling the melt to form a polymer web, such that the beta-form of polypropylene is produced;
- (c) stretching the web containing the beta form of polypropylene to form a film containing microvoids;
- (d) cutting the film into labels,
- wherein said label includes less than 1% by weight of antistatic agent based on the total weight of the label, and
- wherein said label is suitable for use in a labeling process in which individual labels are formed into a stack from which the individual labels are removed as required.
3 more elements
A label stack formed from pre-cut labels,
- wherein the labels are made from a label film comprising a layer of propylene polymer resin having microvoids therein, the microvoids having been formed by stretching a web containing the beta-form of polypropylene to thereby produce a microvoided layer,
- wherein one surface of said microvoided layer does not have any further layer thereon such that said surface of the microvoided layer provides a surface roughness which aids labelling;
- and
- wherein the other surface of said microvoided layer has one or more polymeric layers thereon.
1 more element
Dependencies are inferred from the claim text.