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Hot melt adhesives for multilayer structure enclosures

A composite adhesive and tackifier technology, applied in the bonding field of kraft paper and composite film, can solve problems such as generation and adhesion

Inactive Publication Date: 2013-12-18
HENKEL IP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the empty bags are stacked, stored and transported, which are often subjected to a wide range of temperatures in the storage area, the pre-applied adhesive may prematurely adhere to adjacent stacked bags, commonly referred to as "blocking" phenomenon
Sticking can cause the bags to stick to each other and create problems during user handling

Method used

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  • Hot melt adhesives for multilayer structure enclosures
  • Hot melt adhesives for multilayer structure enclosures
  • Hot melt adhesives for multilayer structure enclosures

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0059] In another embodiment, the method of sealing the pinch bottom bag comprises:

[0060] (i) applying the above adhesive to both open end flaps of a preformed tubular, wherein said preformed tubular is a laminate having multiple layers consisting of a composite film, kraft paper and optionally Made of plastic lining;

[0061] (ii) folding a flap of a sufficient amount to seal one end, thereby causing the adhesive to seal the end of the tube;

[0062] (iii) cooling the remaining adhesive to room temperature;

[0063] (iv) heating to reactivate the remaining adhesive; and

[0064] (v) Folding a sufficient amount of the remaining opening flaps to seal the remaining ends, thereby allowing the reactivated adhesive to seal the remaining ends.

[0065] In another configuration, by rolling or folding the sides of the bag inwardly a sufficient amount and folding the flap, and then sealing the flap with the adhesive and / or reactivated adhesive, the This inner seals the tube.

...

Embodiment

[0073] The samples listed in Table 1 were prepared using techniques known in the art. The components of each adhesive sample are listed in this table. An exemplary procedure includes placing about half of the total amount of tackifier into a jacketed mixing pot with a rotor and raising the temperature to a range of about 100°C to 200°C. When the tackifier is molten, start stirring and add the remaining ingredients until a homogeneous mass is obtained.

[0074] High Density Polymer 1 is a metallocene catalyzed polyolefin with 0.885 g / cm measured according to ASTM D792 3 density of.

[0075] High Density Polymer 2 is a metallocene catalyzed polyolefin with 0.902 g / cm measured according to ASTM D792 3 density of.

[0076] The low density polymer is a metallocene catalyzed polyolefin having 0.870 g / cm measured according to ASTM D792 3 density of.

[0077] Wax 1 is a polyethylene wax with a Brookfield viscosity of <50 cps at 140°C.

[0078] Wax 2 is a polyethylene wax grafte...

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Abstract

The invention provides enclosure adhesives, methods of using the adhesives to bond for enclosing a multilayer structure and to articles of manufacture comprising the adhesives. The multilayer structure is a laminant of at least one composite film and at least one Kraft paper substrates. It has been discovered that an adhesive that comprises (a) a mixture of 1:1 to 5:2 of a metallocene catalyzed polyolefin copolymer with a density greater than or equal to 0.880 g / cm<3> to a metallocene catalyzed polyolefin copolymer with a density less than 0.880 g / cm<3>; (b) a compatible tackifier; and (c) a compatible wax, has high adhesion to both Kraft and composite film with low blocking properties.

Description

[0001] Cross-References to Related Applications [0002] This application claims priority to US Patent Application Serial No. 61 / 473,321 filed April 8, 2011, the contents of which are incorporated herein by reference. technical field [0003] This invention relates to adhesives for multilayer structure enclosures and, more particularly, to the bonding of kraft paper and laminated films in pinch bottom bags. Background technique [0004] Knead bottom bags are manufactured from a ply or structure having multiple layers, which is a laminate of one or more composite films, one or more kraft papers, and optionally one or more plastic liners. The multilayer structure is formed into a tube and then kneaded, thereby internally sealing one end of the tube by folding one end of the tube into the form of a flap and then sealing the flap with adhesive. In another configuration, the tube is internally sealed by rolling or folding the sides of the bag inwardly a sufficient amount and fol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J123/00C09J7/02B65D33/18
CPCC08L23/06C08L23/0815C08L23/0853C08L51/06C08L2203/16C08L2205/025C08L2205/03C08L2314/06C09J123/0815C09J123/0853Y10T156/1051Y10T428/1334Y10T428/31938B65D33/22C09J7/22C09J7/29C09J7/35
Inventor C·埃桑贝多P·海斯
Owner HENKEL IP
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