Hot-melt adhesive and use thereof

Abstract

Use of a hot-melt adhesive for adhesive bonding of at least a first packaging and a second packaging, the hot-melt adhesive comprising: (a) 50-85 parts per weight of a basis polymer, wherein the basis polymer is consisting of a metallocene catalyzed polyolefin polymer, preferably ethene-1-octene-copolymer; (b) 10-25 parts per weight of a modifying polymer, the modifying polymer comprising a styrene block copolymer; (c) 5-25 parts per weight of a reinforcing wax, preferably a polyethylene wax or a wax produced by the Fischer-Tropsch synthesis route, the wax component preferably comprising paraffinic oil, naphthenic oil, polybutene, dibasic ester, polyol or mixtures thereof; and (d) 0.05-1.5 parts per weight of a stabilizer component comprising a sterically hindered phenolic antioxidant and/or a hindered amine light stabilizer and a pack comprising the hot-melt adhesive.

Claims

1. A multipack comprising: a first packaging; a second packaging; and a hot-melt adhesive temporarily adhering said first packaging to said second packaging; the hot-melt adhesive comprising (a) 50-85 parts by weight of a basis polymer, wherein the basis polymer is a metallocene catalysed polyolefin polymer; (b) 10-25 parts by weight of a modifying polymer, the modifying polymer comprising a styrene block copolymer; (c) 5-25 parts by weight of a reinforcing agent, the reinforcing agent comprising a wax; and (d) 0.05-1.5 parts by weight of a stabilizer component selected from the group consisting of a sterically hindered phenolic antioxidant, a hindered amine light stabilizer, and mixtures thereof.

2. The multipack of claim 1, wherein the basis polymer is an elastomer.

3. The multipack of claim 1, wherein the basis polymer is an ethene-1-octene copolymer.

4. The multipack of claim 1, wherein the modifying polymer further comprises ethylene-butyl-acrylate or vinyl-acetate copolymer.

5. The multipack of claim 1, wherein the styrene block copolymer is selected from the group consisting of polystyrene-block-polyolefin, polystyrene-block-poly(ethylene-RAN-butylene)-block-polystyrene, and polystyrene-block-polybutadiene-block-polystyrene, optionally hydrogenated.

6. The multipack of claim 1, wherein the reinforcing agent is selected from the group consisting of a polyethylene-wax, a Fischer-Tropsch-wax, and mixtures thereof.

7. The multipack of claim 1, wherein the reinforcing agent further comprises paraffinic oil, naphthenic oil, polybutadiene, dibasic ester, polyol, and mixtures thereof.

8. The multipack of claim 1, wherein the stabilizer is pentaerythritol tetrakis(3-(3,5-di-tert-butyl-4-hydroxy-phenyl) propionate).

9. The multipack of claim 1, wherein the at least two packagings are foodstuff packaging selected from the group consisting of a plastic bottle and a can.

Description

EXAMPLES

(1) Several hot-melt adhesive composition according to the invention were prepared. All of the compositions featured good adhesion of not more than 15 N/25 mm according to peel adhesion (180 C.) and loop tack (23 C.) for connecting PET packagings.

(2) Hot-melt adhesives according to the invention, exemplary compositions of which are shown in the below Table 2, where compared with adhesives known from the prior art, the compositions and properties of which are summarized in Table 1.

(3) As it is evident from the below results, the hot-melt adhesives according to the invention feature superior properties in the inventive use.

(4) TABLE-US-00001 TABLE 1 Removable adhesives of the prior art. Typical SBS/SIS Parts by Typical SEBS Parts by removable adhesive Weight % removable adhesive Weight % SIS Block-copolymer 20 SEBS Block-copolymer 31.4 15% styrene/melt flow 30% styrene/melt flow index (200 C./5 Kg) = 25 index (230 C./5 Kg) = 5 SBS Block-copolmyer 22.2 DCPD Resin 46 43% styrene-block- copolymer/melt flow index (200 C./5 kg = 25 White mineral oil 20 White mineral oil 22 Paraffin wax 62-68 5 Micro crystalline wax 0.5 DCPD resin 32 Antioxidant/stabilisor 0.1 package Stabiliser package 0.8 Peel adhesion 180 to 5.2 N/25 mm Peel adhesion to PET 4.89 N/25 mm PET initial after 24 hrs* SAFT (heat resistance) 40 40 ASTM D4498-07 modified 100 g weight used Viscosity @ 170 C. 1000 cPs 980 cPs ASTM D3236 Brookfield SC-4-27 Loop tack initial PET 6.42 N/25 mm Loop Tack 5.4 N/25 mm after 24 hrs at 23 C.* Peel adhesion I80 PET .sup.15 N/25 mm Peel adhesion I80 18.4 N/25 mm after 28 days at 23 C. after 28 days at 23 C. Loop tack after 28 13.6 N/25 mm Loop tack after 28 16.42 N/25 mm days at 23 C. days at 23 C. *FINAT test methods

(5) TABLE-US-00002 TABLE 2 Compositions of the invention Type V20 Type V22 Type V25 Ingredients/Properties % by weight % by weight % by weight SEBS Block-copolymer 12 20 25 30% styrene/melt flow index (230 C./5 Kg) = 5 Mettallocene catalysed 65.5 58 53 polyolefin blend White mineral oil 22 22 22 Stabiliser package 0.5 0.5 0.5 SAFT (heat resistance) 45 45 55 ASTM D4498-07 modified 100 g weight used Viscosity @ 170 C. 5,800 cPs 8,800 cPs 10,260 cPs ASTM D3236 Brookfield RVT SC-4-27 Peel adhesion 180 to 9.5 N/25 mm 8.4 N/25 mm.sup. 1.6 N/25 mm PET initial after 24 hrs* Loop tack initial PET 10 N/25 mm 8 N/25 mm .sup.4 N/25 mm after 24 hrs at 23 C. * Peel adhesion I80 PET Not 4 N/25 mm 1.6 N/25 mm after 28 days at 23 C.* measurable Loop tack after 28 Not 11.25 N/25 mm.sup. 9.54 N/25 mm days at 23 C.* measurable

(6) All documents cited herein are incorporated in their entireties by reference.

(7) The features disclosed in the foregoing description and/or in the claims may, both separately and in any combination thereof, be material for realizing the invention in diverse forms thereof.