Twist shut adhesive sealable trash liner

Patent metadata

Field	Value
Publication number	US-11078389-B2
Application number	US-202017049762-A
Country	US
Kind code	B2
Filing date	Mar 31, 2020
Priority date	Apr 1, 2019
Publication date	Aug 3, 2021
Grant date	Aug 3, 2021

Abstract

In the present invention, a solvent-based (SB) adhesive for the purpose of closing or sealing the open end of a bag, such as a plastic trash bag, liner or like, is coated to the exterior or interior surface of said bag and creates a neat, tight functional seal to said bag when twist activated.

First claim

What is claimed:

1. A method for preparing a twist and seal flexible article, comprising:
a) providing a flexible article comprising:
i) a front panel and a back panel, each comprising a flexible substrate;
ii) wherein the front panel and the back panel each have an inside surface and an outside surface;
iii) the inside surface of the front panel faces the inside surface of the back panel;
iv) the front panel and the back panel are joined on three sides, and the fourth side is open;

b) providing an adhesive composition;
c) applying the adhesive composition:
i) to the inside surface of the front panel and the inside surface of the back panel; wherein the article can be sealed by a twisting motion that brings the inside surface of the back panel and the inside surface of the front panel into contact that activates the adhesive composition; or
ii) to the outside surface of the front panel and the inside surface of the back panel; wherein the article can be sealed by a twisting motion, or a fold over and twisting motion, that brings the outside surface of the front panel and the inside surface of the back panel into contact that activates the adhesive composition; or
iii) to the inside surface of the front panel and the outside surface of the back panel; wherein the article can be sealed by a twisting motion, or a fold over and twisting motion, that brings the inside surface of the front panel and the outside surface; or
iv) to the outside surface of the front panel and the outside surface of the back panel; wherein the article is inverted (turned inside out) prior to use so that the article can be sealed with a twisting motion that brings the adhesive coated surfaces of the front panel and the back panel into contact that activates the adhesive composition.

2. The method of claim 1 , wherein the flexible article is a liner or a bag.

3. The method of claim 1 , wherein the flexible article comprises a plastic or polymeric material.

4. The method of claim 1 , wherein the plastic or polymeric material is a plastic or polymeric film or sheet.

5. The method of claim 1 , wherein the adhesive is applied in a continuous coat.

6. The method of claim 1 , wherein the adhesive is applied as a discontinuous pattern.

7. The method of claim 1 , wherein the adhesive composition resists blocking at 50 psi and 50° C. for 16 hours; and/or wherein the adhesive material resists blocking at 600 psi and room temperature (20° C. to 27° C.) for 10 hours.

8. The method of claim 1 , wherein the bond strength (in N/15 mm) between the activated adhesive composition on the front panel and the back panel is greater than the force necessary to tear the flexible article (in N/15 mm).

9. The method of claim 1 wherein the adhesive composition comprises:
a) one or more polymers or resins;
b) one or more tackifying resins;
c) one or more solvents; and
d) one or more waxes.

10. The method of claim 1 , wherein the adhesive comprises one or more ethylene vinyl alcohol (EVA) polymers or resins; and/or one or more polyester polymers or resins; and/or one or more polyamide polymers or resins.

11. The method of claim 1 , wherein the adhesive composition is solvent-based.

12. A twist and seal article prepared by the method of claim 1 .

13. The twist and seal article of claim 12 , wherein the twist and seal article is a bag or liner.

Assignees

• Sun Chemical Corp

Inventors

• Kurtz Paul
• Schottland Philippe
• Schwartz Russell
• NAKANE Kohei

Classifications

• C09J167/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds (C09J167/06 takes precedence) · CPC title

• B65F1/002 Primary

  with means for opening or closing of the receptacle · CPC title

• C09J129/02 Primary

  Homopolymers or copolymers of unsaturated alcohols (C09J129/14 takes precedence) · CPC title

• B65D33/18

  using adhesive applied to integral parts, e.g. to flaps · CPC title

• C09J177/00

  Adhesives based on polyamides obtained by reactions forming a carboxylic amide link in the main chain (based on polyhydrazides C09J179/06; based on polyamide-imides C09J179/08); Adhesives based on derivatives of such polymers · CPC title