Recyclable plastic label

Patent metadata

Field	Value
Publication number	US-12305092-B2
Application number	US-202117927172-A
Country	US
Kind code	B2
Filing date	May 31, 2021
Priority date	Jun 3, 2020
Publication date	May 20, 2025
Grant date	May 20, 2025

Abstract

The disclosure relates to a mechanically recyclable label ( 1 ) comprising a face ( 2 ) and an adhesive ( 4 ). The face ( 2 ) comprises ethylene containing polymer and the adhesive ( 4 ) comprises pressure sensitive adhesive. The pressure sensitive adhesive comprises at least 15 wt. % of a base polymer, at least 25 wt. % of a tackifier and at least 10 wt. % of a plasticizer. The base polymer, the tackifier and the plasticizer are colourless and odourless. The base polymer is a styrene block copolymer. The mechanically recyclable label ( 1 ) is mechanically recyclable with packaging material comprising ethylene containing polymer. The disclosure further relates to a label laminate ( 8 ), a method for manufacturing a label laminate ( 8 ), a labelled item ( 101 ), as well as to use of a label ( 1 ) and of a label laminate ( 8 ). The disclosure also relates to use of a waste matrix of the label laminate for producing granulates of recycled plastic.

First claim

The invention claimed is:

1. A mechanically recyclable label ( 1 ) for mechanical recycling with packaging material the label has been adhered to, the packaging material comprising ethylene containing polymer; the mechanically recyclable label ( 1 ) comprising a face ( 2 ) and an adhesive ( 4 ), wherein the face ( 2 ) comprises ethylene containing polymer and the adhesive ( 4 ) comprises pressure sensitive adhesive, the pressure sensitive adhesive comprising
at least 15 wt. % of a base polymer,
at least 25 wt. % of a tackifier and
at least 10 wt. % of a plasticizer,
wherein the base polymer is styrene-ethylene/butylene-styrene (SEBS), the tackifier is a hydrogenated hydrocarbon resin and the plasticizer is polyisobutylene.

2. The mechanically recyclable label ( 1 ) according to claim 1 , wherein the plasticizer comprises a compound fulfilling at least one of the following:
comprising an average molecular weight of at least 480 Da,
having a viscosity at 100 degrees C. of at least 8.5×10 −6 m 2 /s,
having a content of mineral hydrocarbons with a carbon number equal to or below 25 of not more than 5% (w/w).

3. The mechanically recyclable label ( 1 ) according to claim 1 , wherein the label ( 1 ) is mechanically recyclable in a process comprising ethylene containing polymer and at most 5 wt. % of pressure sensitive adhesive, the process being arranged to provide recycled plastic material.

4. The mechanically recyclable label ( 1 ) according to claim 1 , wherein
the tackifier is at least one of the following: C 5 /C 9 resin, C 5 resin, C 9 resin.

5. A label laminate ( 8 ) for providing mechanically recyclable labels ( 1 ) for mechanical recycling with packaging material the label has been adhered to, the packaging material comprising ethylene containing polymer, the label laminate ( 8 ) comprising a face ( 2 ), an adhesive ( 4 ) and a release liner ( 6 ), the face ( 2 ) being adjoined to the release liner ( 6 ) via the adhesive ( 4 ), the face ( 2 ) comprising ethylene containing polymer and the adhesive ( 4 ) comprising pressure sensitive adhesive, the pressure sensitive adhesive comprising
at least 15 wt. % of a base polymer,
at least 25 wt. % of a tackifier and
at least 10 wt. % of a plasticizer,

and wherein the base polymer is styrene-ethylene/butylene-styrene (SEBS), the plasticizer is polyisobutylene (PIB) and the tackifier is hydrogenated hydrocarbon resin.

6. The label laminate ( 8 ) according to claim 5 , wherein the plasticizer comprises a compound fulfilling at least one of the following:
comprising an average molecular weight of at least 480 Da,
having a viscosity at 100 degrees C. of at least 8.5×10 −6 m 2 /s,
having a content of mineral hydrocarbons with a carbon number equal to or below 25 of not more than 5% (w/w).

7. The label laminate ( 8 ) according to claim 5 , wherein
the tackifier is at least one of the following: C 5 /C 9 resin, C 5 resin, C 9 resin.

8. A method for manufacturing a label laminate ( 8 ) according to claim 5 , the method comprising the following steps of:
arranging a substrate as a release liner ( 6 ) or a face ( 2 ),
coating the substrate with an adhesive ( 4 ), the adhesive ( 4 ) comprising pressure sensitive adhesive, and
laminating the release liner ( 6 ) together with the face ( 2 ) in such a way that the adhesive ( 4 ) is arranged in between the face ( 2 ) and the release liner ( 6 ), wherein the face ( 2 ) comprises ethylene containing polymer and the pressure sensitive adhesive comprises at least 15 wt. % of a base polymer, at least 25 wt. % of a tackifier and at least 10 wt. % of a plasticizer, and wherein the base polymer is styrene-ethylene/butylene-styrene (SEBS), the plasticizer is polyisobutylene (PIB) and the tackifier is hydrogenated hydrocarbon resin.

9. A labelled item ( 101 ) comprising an item ( 100 ) and a mechanically recyclable label ( 1 ) according to claim 1 , wherein the mechanically recyclable label ( 1 ) is attached to a surface of the item ( 100 ) through the adhesive ( 4 ) of the label ( 1 ), the material of the item comprises ethylene containing polymer, and the labelled item is mechanically recyclable.

10. A granulate of recycled plastic, comprising a waste matrix of a label laminate ( 8 ) according to claim 5 , wherein the waste matrix comprises a face ( 2 ) and an adhesive ( 4 ).

11. A plastic item comprising a granulate of recycled plastic according to claim 10 .

Assignees

• Upm Raflatac Oy

Inventors

• Yli-Peltola Juha
• Kivinen Sami

Classifications

• G09F2003/0241

  Repositionable or pressure sensitive adhesive · CPC title

• G09F2003/0223

  recyclable · CPC title

• G09F3/10

  by an adhesive layer · CPC title

• G09F3/02

  Forms or constructions (layered products B32B) · CPC title

• B29B9/04

  in the form of plates or sheets · CPC title