Hot melt adhesive composition for bonding packs of plastic containers

Patent metadata

Field	Value
Publication number	US-2016177150-A1
Application number	US-201514973372-A
Country	US
Kind code	A1
Filing date	Dec 17, 2015
Priority date	Dec 17, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention relates to a hot melt adhesive composition, comprising based on the total weight of the hot melt adhesive composition: (a) more than 25 weight percent of at least one block copolymer, (b) from about 27 to about 45 weight percent of at least one plasticizer, (c) from about 18 to less than about 55 weight percent of a combination of at least two different resins; and (d) optionally up to 10% weight percent of at least one wax. The hot melt adhesive composition of the invention can be used for bonding bundles of plastic containers such as bottles into packs.

First claim

What is claimed is:

1 . A container pack comprising a plurality of containers, wherein the containers are bonded to each other with a hot melt adhesive composition comprising based on the total weight of the hot melt adhesive composition:
a) more than 25 weight percent of at least one block copolymer, b) from about 27 to about 45 weight percent of at least one plasticizer, c) from about 18 to less than about 55 weight percent of a combination of at least two different resins; and d) up to 10 weight percent of at least one wax.

2 . The container pack of claim 1 wherein the containers are plastic.

3 . The container pack of claim 2 wherein the containers comprise a plastic selected from a group consisting of polyethylene terephthalate, polyethylene napthalate, other polyesters, polyethylene, polypropylene, polystyrene, polycarbonate and combinations thereof.

4 . The container pack of claim 2 wherein the hot melt adhesive is removable from the plastic containers.

5 . The container pack of claim 3 wherein the containers comprise polyethylene terephthalate.

6 . The container pack of claim 1 wherein the at least two different resins of the hot melt adhesive composition comprise at least one aromatic hydrocarbon resin and at least one aliphatic hydrocarbon resin, and wherein the weight ratio of aromatic hydrocarbon resin to aliphatic hydrocarbon resin is 3:1 to 1:3.

7 . The container pack of claim 1 wherein the hot melt adhesive composition has a Brookfield viscosity of from about 4,000 to about 12,000 mPas at 175° C.

8 . The container pack of claim 1 wherein the contents of the containers is a beverage.

9 . A hot melt adhesive composition comprising based on the total weight of the hot melt adhesive composition:
a) from about 25 to about 40 weight percent of the at least one block copolymer; b) from about 27 to about 45 weight percent of the at least one plasticizer; c) from about 26 to about 40 weight percent of a combination of at least two different resins; and d) from 0 to about 8 weight percent of the at least one wax.

10 . The hot melt adhesive composition according to claim 9 , wherein the at least one block copolymer has at least one A block that includes a vinyl aromatic compound, and at least one B block that includes an elastomeric hydrogenated or unhydrogenated conjugated diene and combinations thereof, and wherein the at least one block copolymer is a linear A-B block, linear A-B-A block, linear A-(B-A) n -B multi-block, and radial (A-B) n -Y block where Y is a multivalent compound and n is an integer of at least 3, linear A-B-A-B tetrablock, or linear A-B-A-B-A pentablock copolymer.

11 . The hot melt adhesive composition according to claim 10 , wherein the at least one block copolymer is a triblock styrenic block copolymer selected from the group consisting of a styrene-ethylene/butylene-styrene (SEBS), styrene-ethylene/propylene-styrene (SEPS), and a styrene-ethylene-ethylene/propylene-styrene block copolymer.

12 . The hot melt adhesive according to claim 9 , wherein
(a) the at least one block copolymer has a styrene content of about 20 to about 40 weight percent; and (b) the at least one block copolymer has a diblock content of 20 weight percent or less.

13 . The hot melt adhesive composition according to claim 9 , wherein the at least one plasticizer is a mineral oil.

14 . The hot melt adhesive composition according to claim 9 , wherein the at least two different resins both have a Ring & Ball softening point of at least about 110° C.

15 . The hot melt adhesive composition according to claim 9 , wherein the combination of at least two different resins comprises at least one aromatic hydrocarbon resin and at least one aliphatic hydrocarbon resin, and wherein the weight ratio of aromatic hydrocarbon resin to aliphatic hydrocarbon resin is 3:1 to 1:3.

16 . The hot melt adhesive composition according to claim 15 , wherein
(a) the aliphatic hydrocarbon resin is selected from the group consisting of aliphatic and cycloaliphatic hydrocarbon resins, hydrogenated hydrocarbon resins, terpenes, modified terpenes and hydrogenated versions thereof; natural rosins, modified rosins, rosin esters, and hydrogenated versions thereof; and combinations thereof; and (b) the aromatic hydrocarbon resin comprises monomers selected from the group consisting of styrene, alpha methyl styrene, vinyl toluene, and indene.

17 . The hot melt adhesive composition according claim 9 , wherein the wax is present at from about 3 weight percent to about 8 weight percent and is selected from the group consisting of paraffin waxes, microcrystalline waxes, Fischer-Tropsch waxes, synthetic high melting point waxes (HMP), polyethylene wax and, polypropylene wax.

18 . The hot melt adhesive composition according to claim 9 , further comprising at least one additive selected from the group consisting of antioxidants, antiblock additives, pigments, rheology modifying additives, adhesion promoters and fillers.

19 . The hot melt adhesive composition according to claim 9 , wherein the hot melt adhesive composition has a Brookfield viscosity at a temperature of 175° C. from about 4,000 to about 12,000 mPa·s.

20 . The hot melt adhesive composition according to claim 9 , wherein the sum of components a), b), c) and d) amounts to at least 90 weight percent of the total adhesive composition.

Assignees

• Fuller H B Co

Inventors

• Juers Stefan
• Axer Vera
• Holtin Ulrich

Classifications

• C09J153/025 Primary

  modified · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• B65D69/00

  Articles joined together for convenience of storage or transport without the use of packaging elements · CPC title

• B65D21/0205 Primary

  joined together by bonding, adhesive or the like (B65D21/0208 takes precedence) · CPC title

• C09J11/06

  organic · CPC title