FOAMED HOT MELT ADHESIVE COMPOSITION FOR BONDING PACKS OF CONTAINERS

• US 20150197671A1
• Filed: 01/09/2015
• Published: 07/16/2015
• Est. Priority Date: 01/10/2014
• Status: Active Grant

• Current Assignee: HB Fuller Company
• Original Assignee: HB Fuller Company
• Inventors: Becker, Christian
• Granted Patent: US 10,407,595 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B32B 2037/1215 Hot-melt adhesive
• CPC Class Codes: B32B 2439/00 Containers; Receptacles
• CPC Class Codes: B32B 37/1207 Heat-activated adhesive B32B37/04 takes precedence
• CPC Class Codes: B32B 37/18 involving the assembly of discrete sheets or panels only
• CPC Class Codes: B65D 21/0205 joined together by bonding, adhesive or the like B65D21/0208 takes precedence
• CPC Class Codes: C09J 11/08 Macromolecular additives
• CPC Class Codes: C09J 123/08 Copolymers of ethene C09J123/16 takes precedence
• CPC Class Codes: C09J 153/02 Vinyl aromatic monomers and conjugated dienes
• CPC Class Codes: C09J 2301/304 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C

Abstract

The present invention relates to a container pack comprising a plurality of containers, wherein the containers are bonded to each other with a foamed hot melt adhesive composition. In addition, the present invention also relates to the use of a foamed hot melt adhesive composition for bonding bundles of containers into packs.

Claims

1. A container pack comprising a plurality of containers, wherein the containers are bonded to each other with a foamed hot melt adhesive composition.

2. The container pack according to claim 1, wherein the containers are bottles or cans.

3. The container pack according to claim 1, wherein the containers are PET bottles.

4. The container pack according to claim 1, wherein the hot melt adhesive composition comprises:

a) at least one polymer; and

b) at least one tackifying resin.

5. The container pack according to claim 4, wherein the hot melt adhesive composition further comprises at least one wax.

6. The container pack according to claim 1, wherein the hot melt adhesive composition has a Brookfield viscosity at a temperature of 190°

C. in the range from about 200 to about 13,000 mPa·

s.

7. The container pack according to claim 4, wherein the at least one polymer comprises at least one block copolymer.

8. The container pack according of claim 4, further comprising a plasticizer.

9. The container pack according to claim 1, wherein the hot melt adhesive composition comprises:

a) from about 35 to about 60 weight percent of at least one homogenous linear or substantially linear interpolymer of ethylene and α

-olefin;

b) from about 5 to about 25 weight percent of at least one block copolymer;

c) from about 25 to about 45 weight percent of at least one tackifying resin; and

d) less than 10 weight percent of at least one wax;

wherein the sum of components a), b) and c) amounts to at least 85 weight percent of the total adhesive composition, and

wherein the composition has a Brookfield viscosity at a temperature of 190°

C. in the range from about 7,000 to about 12,000 mPa·

s.

10. The container pack according to claim 7, wherein the at least one block copolymer is selected from the group consisting of styrene-ethylene/butylene-styrene (SEBS) and styrene-ethylene/propylene-styrene (SEPS).

11. The container pack according to claim 1, wherein the foamed hot melt adhesive composition has a density of from about 0.40 g/ml to about 0.80 g/ml.

12. The container pack according to claim 1, wherein the foamed hot melt adhesive composition provides a separation force of from about 75 N to about 200 N.

13. Use of a foamed hot melt adhesive composition for bonding bundles of containers into packs.

14. The use according to claim 13, wherein the hot melt adhesive composition is foamed upon application with air or an inert gas, preferably with nitrogen.

15. The use according to claim 14, wherein the hot melt adhesive composition is foamed upon application to achieve a density reduction of 25 to 50 percent compared to the hot melt adhesive composition applied without foaming.

16. The use according to claim 13, wherein the hot melt adhesive composition is applied directly onto the containers.

17. The use according to claim 13, wherein 50 to 300 mg of foamed hot melt adhesive composition is applied to a container surface for bonding, and wherein the foamed hot melt adhesive composition is applied as separate dots with 60 mg to 300 mg per dot.

18. The use according to claim 13, wherein the hot melt adhesive composition is applied to wet containers having a temperature of 10°

C. or less.

19. The use according to claim 13, wherein the containers are bottles or cans.

20. The use according to claim 13, wherein the containers are PET bottles.