US 10,858,545 B2Granted

Shrink wrap labels for shaped articles

AssigneePolysack Flexible Packaging Ltd.

InventorsIzhar Halahmi, Nitai Alush-aben

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Abstract

Methods for applying high shrink wrap labels to a shaped article are disclosed. The leading edge of the label is bonded to the article. A seaming agent is applied, and the label is wrapped around the article. The seaming agent is then exposed to radiation to cure the seaming agent, and the label is then exposed to heat to cause heat-shrinking. The label is made of a film with at least one external layer that has a Hildebrand solubility parameter. The seaming agent includes a component having a Hildebrand solubility parameter that is within 2.2 MPa1/2 or within 4.4 calories1/2·cm−3/2 of the Hildebrand solubility parameter of the external layer of the film. The seaming agent also has a viscosity of at least 1 centipoise and less than 1000 centipoise when measured at any temperature between ambient temperature and 60° C. Articles including such affixed high shrink wrap labels are also disclosed.

Claims22

Dependent claims

A liquid radiation-curable seaming agent for bonding an associated high shrink label film containing polystyrene (PS), polyethylene terephthalate glycol-modified (PETG), or polyvinyl chloride (PVC) to itself, the seaming agent having an immediate welding strength of greater than 2 grams within less than 0.5 seconds on the associated high shrink label film, and having at least one component with a Hildebrand solubility parameter that is within 2.2 MPa1/2 or within 4.4 calories1/2·cm−3/2 Hildebrand solubility parameter of an external layer of the associated high shrink label film, and having the ability to form a seam that has a seam quality of at least 2 after heat shrinkage of the film of greater than 25%, and having a viscosity of 1 centipoise (cP) to 100 cP when measured at any temperature between ambient temperature and 60° C.;

and
comprising at least one monomer which is tetrahydrofurfuryl acrylate (THFA) or caprolactone-modified THFA;
cyclic trimethylol propane formal acrylate (CTFA);
isobornyl acrylate;
isobornyl methacrylate;
alkoxylated phenyl acrylate;
hexanediol diacrylate;
butanediol diacrylate;
butanediol dimethacrylates;
alkoxylated aliphatic or cycloaliphatic diol diacrylate or dimethacrylate;
tricyclodecanedimethanol diacrylate (TCDDA);
ethoxylated cyclohexane dimethanol diacrylate (EO-CHMDA);
hydroxy pivalic acid neopentyl glycol diacrylate or caprolactone-modified hydroxy pivalic acid neopentyl glycol diacrylate, hydroxypyvalyl pivalate diacrylate (HPPDA), or caprolactone acrylate.

10 more elements

A liquid radiation-curable seaming agent for bonding an associated high shrink label film containing a polyolefin or a cyclic olefin polymer (COP) or a cyclic olefin copolymer (COC) to itself, the seaming agent having an immediate welding strength of greater than 2 grams within less than 0.5 seconds on the associated high shrink label film, and having at least one component with a Hildebrand solubility parameter that is within 2.2 MPa1/2 or within 4.4 calories1/2·cm−3/2 of a Hildebrand solubility parameter of an external layer of the associated high shrink label film, and having the ability to form a seam that has a seam quality of at least 2 after heat shrinkage of the film of greater than 25%, and having a viscosity of 1 centipoise (cP) to 100 cP when measured at any temperature between ambient temperature and 60° C.;

and
comprising at least one monomer which is isobornyl acrylate, isobornyl methacrylate, cyclohexyl acrylate, ethyl hexyl acrylate, ethyl hexyl methacrylate, tert-butyl cyclohexyl acrylate, trimethyl cyclohexyl acrylate, alkyl acrylates, alkyl methacrylates, tricyclodecanedimethanol acrylate, styrene, vinyltoluene, benzyl acrylate, lauryl acrylate, isodecyl acrylate, phenoxy benzyl acrylate, ethoxylated aryl acrylate, alkylated phenyl acrylate, or phenyl acrylate.

A liquid radiation-curable seaming agent for bonding an associated high shrink label film containing polystyrene (PS), polyethylene terephthalate glycol-modified (PETG), or polyvinyl chloride (PVC) to itself, the seaming agent having an immediate welding strength of greater than 2 grams within less than 0.5 seconds on the associated high shrink label film, and having at least one component with a Hildebrand solubility parameter that is within 2.2 MPa112 or within 4.4 calories1/2·cm−3/2 of a Hildebrand solubility parameter of an external layer of the associated high shrink label film, and having the ability to form a seam that has a seam quality of at least 2 after heat shrinkage of the film of greater than 25%, and having a viscosity of 1 centipoise (cP) to 100 cP when measured at any temperature between ambient temperature and 60° C.;

wherein the seaming agent comprises:
from about 10 wt % to about 98 wt % of at least one monomer;
up to 80 wt % of at least one oligomer or polymer;
0 to about 50 wt % of an organic solvent;
from about 0.5 wt % to about 15 wt % of a photoinitiator;
and
from about 0.2 wt % to about 2 wt % of an acrylated amine.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/569,699Filed 13 Sep 2019 · us provisional application
Priority: 14 Sep 2018
Published: US 2020/0087540 A119 Mar 2020
Granted: 8 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification37 codes

B29C 66/496
Internally supporting the, e.g. tubular, article during joining: using a support which remains in the joined object
C09J 4/06
Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based…
B29C 63/38
Lining or sheathing, i.e. applying preformed layers or sheathings of plastics; Apparatus therefor: by liberation of internal stresses
B29C 65/02
Joining or sealing of preformed parts , e.g. welding of plastics materials; Apparatus therefor: by heating, with or without pressure