Paper bag

Patent metadata

Field	Value
Publication number	US-11339537-B2
Application number	US-201916523007-A
Country	US
Kind code	B2
Filing date	Jul 26, 2019
Priority date	Aug 23, 2018
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

The present invention provides compositions comprising cellulose fibers and cellulose ester fibers and wet laid articles made from the compositions, as well as wet laid processes to produce these compositions. More specifically, the present invention provided compositions comprising cellulose fibers and cellulose acetate fibers and wet laid articles made from these compositions as well as wet laid processes to produce these compositions. The present invention also relates to developing a composition, process, wet laid product, or articles exhibiting any one of many desired benefits. This invention also relates to a biodegradable bag.

First claim

What we claim is:

1. A paper bag article having a basis weight of 50 g/m 2 to at least 150 g/m 2 , wherein the paper bag article comprises cellulose fibers and cellulose ester (CE) staple fibers, wherein at least a portion of said CE staple fibers are combined with said cellulose fibers and co-refined; wherein said CE staple fibers have a denier per filament (DPF) of at least 1.8 to about 3; wherein said CE staple fibers are present in an amount from about 4 wt % to less than 16 wt %; and wherein said CE staple fibers have:
i) a cut length of 3 mm to less than 6 mm, and
crimping,
wherein said paper bag article is not creped and has increased Elmendorf tear strength compared to a paper bag article made with 100% cellulose comparative composition when processed under similar conditions.

2. A paper bag article according to claim 1 having a basis weight of 50 g/m 2 to at least 150 g/m 2 obtained from a composition comprising co-refined cellulose fibers and cellulose ester (CE) staple fibers, wherein the paper bag article has the same, higher, or not more than a 5% reduction in Gurley stiffness, and a lower density, in each case relative to the same paperboard obtained from a 100% cellulose comparative composition.

3. The paper bag article of claim 1 , wherein the composition further comprises an additive which comprises one or more of the following: fillers, talc, clay, calcium carbonate, titanium dioxide, starches, plasticizers, antioxidants, surfactants, crosslinking agents, thermal stabilizers, pro-oxidants, acid scavengers, brightening agents, pigments, dyes, dry or wet strength polymers antimicrobials, adhesives, and colorants.

4. The paper bag article of claim 1 , wherein the composition further comprises a binder which comprises one or more of the following: latexes, starches, acrylic latexes, acrylic polymers, vinyl acetate homopolymers, ethylene vinyl acetate copolymers, polyvinyl lactic acid, bicomponent polymers, bicomponent fibers, bicomponent polypropylene/polyethylene fibers, bicomponent fibers with a polyester core and polyethylene sheath or bicomponent fibers with a polyester core and co-polymer sheath, olefins, polypropylene, polyethylene, rayon, polyesters, co-polyesters, kymene, plasticizers, and cellulose acetate plasticizers, sulfopolyesters, sulfopolyester dispersions, conjugated diene-based copolymer latex, polyvinyl acetate, polyvinyl alcohol and polyvinyl alcohol derivatives natural polymer resins and derivatives thereof, vinyl polymers, polypropylene glycol, polyethylene glycol, maleic anhydride and copolymers thereof.

5. The paper bag article of claim 1 , wherein the cellulose fibers are virgin fibers.

6. The paper bag article of claim 1 , wherein the composition further comprises recycled cellulose fibers or recycled cellulose acetate fibers.

7. The paper bag article of claim 6 , wherein the wet laid product, package, or packing article satisfies the following criteria:
1) is biodegradable in that at least 90%, of its carbon content is converted within 180 days;
2) is disintegrable in that least 90%, of the paper bag article disintegrates within 12 weeks;
wherein each of these conditions are tested, as applicable, under ASTM D6400, or ISO 17088, or EN 13432 test methods.

8. The paper bag article of claim 1 , wherein the article comprises 10-99 wt % of recycled cellulose fibers or recycled cellulose acetate fibers.

9. The paper bag article of claim 1 , wherein the cellulose ester fibers have a cut length of 5 mm or less.

10. The paper bag article of claim 1 , wherein the cellulose ester fibers have a cut length of less than 4 mm.

11. The paper bag article of claim 1 , wherein the cellulose ester fibers have a multi-lobal crenulated shape.

Assignees

• Eastman Chem Co

Inventors

• Everett Charles Stuart
• Mitchell Melvin Glenn
• Parker Kenny Randolph
• Ghosh Koushik
• Izallalen Mounir

Classifications

• D21H17/74

  of organic and inorganic material · CPC title

• D21H15/04

  crimped, kinked, curled or twisted fibres · CPC title

• D21H13/06 Primary

  Cellulose esters · CPC title

• D21H17/68

  siliceous, e.g. clays · CPC title

• B65D31/00

  Bags or like containers made of paper and having structural provision for thickness of contents (with shock-absorbing properties B65D81/03) · CPC title