Cleansing wipe formed from a nonwoven including ethylene/alpha-olefin interpolymers

Patent metadata

Field	Value
Publication number	US-11903531-B2
Application number	US-201917756533-A
Country	US
Kind code	B2
Filing date	Dec 20, 2019
Priority date	Dec 20, 2019
Publication date	Feb 20, 2024
Grant date	Feb 20, 2024

Abstract

A cleansing wipe may be formed from a nonwoven and includes a first ethylene/alpha-olefin interpolymer and a second ethylene/alpha-olefin interpolymer. The cleansing wipe may also have a SaMbSc configuration, wherein the M, meltblown layer, is formed from the first ethylene/alpha-olefin interpolymer and the second ethylene/alpha-olefin interpolymer. The cleansing wipe may be formed a nonwoven comprising bicomponent fibers that incorporate the first ethylene/alpha-olefin interpolymer and the second ethylene/alpha-olefin interpolymer.

First claim

We claim:

1. A cleansing wipe formed from a nonwoven comprising:
a first ethylene/alpha-olefin interpolymer having
(i) a density of from 0.911 to 0.939 g/cc,
(ii) a Brookfield viscosity from 5,000 cP to 40,000 cP,
(iii) a crystallization temperature (Tc) from 85° C. to 105° C.,
(iv) a melting temperature (Tm) wherein the first ethylene/alpha-olefin interpolymer has a temperature differential between the Tm and the Tc of less than 12° C. (ΔTm−Tc<12), and
(v) a molecular weight distribution (M w ,cc/M n ,cc) of 1.8 to 3.5; and
from 2.5 wt. % to 25 wt. % of a second ethylene/alpha-olefin interpolymer having a density of less than 0.900 g/cc and a melt index (I2) of at least 10 g/10 min.

2. A cleansing wipe having a S a M b S c configuration, wherein S is a spunbond nonwoven and M is a meltblown layer, a and c are the number of layers of S and are independent integers ranging from 0 to 5, and b is the number of layers of M and is an independent integer ranging from 1 to 5; and
wherein M comprises a first ethylene/alpha-olefin interpolymer having
(i) a density of from 0.911 to 0.939 g/cc,
(ii) a Brookfield viscosity from 5,000 cP to 40,000 cP,
(iii) a crystallization temperature (Tc) from 85° C. to 105° C.,
(iv) a melting temperature (Tm) wherein the first ethylene/alpha-olefin interpolymer has a temperature differential between the Tm and the Tc of less than 12° C. (ΔTm−Tc<12), and
(v) a molecular weight distribution (M w,CC /M n,CC ) of 1.8 to 3.5; and
from 2.5 wt. % to 25 wt. % of a second ethylene/alpha-olefin interpolymer having a density of less than 0.900 g/cc and a melt index (I2) of at least 10 g/10 min.

3. A cleansing wipe formed from a nonwoven comprising a bicomponent fiber, wherein:
the bicomponent fiber has a first region and a second region,
the first region is formed from a first composition comprising at least 75 wt. % of a polypropylene;
the second region is formed from a second composition comprising a first ethylene/alpha-olefin interpolymer having
(i) a density of from 0.911 to 0.939 g/cc,
(ii) a Brookfield viscosity from 5,000 cP to 40,000 cP,
(iii) a crystallization temperature (Tc) from 85° C. to 105° C.,
(iv) a melting temperature (Tm) wherein the first ethylene/alpha-olefin interpolymer has a temperature differential between the Tm and the Tc of less than 12° C. (ΔTm−Tc<12), and
(v) a molecular weight distribution (M w,CC /M n,CC ) of 1.8 to 3.5; and
from 2.5 wt. % to 25 wt. % of a second ethylene/alpha-olefin interpolymer having a density of less than 0.900 g/cc and a melt index (I2) of at least 10 g/10.

4. The cleansing wipe of claim 1 , wherein the second ethylene/alpha-olefin interpolymer has a density from 0.850 to 0.890 g/cc and a melt index (I2) of from 10 g/10 min to 600 g/10 min.

5. The cleansing wipe of claim 1 , wherein the second ethylene/alpha-olefin interpolymer is an ethylene/alpha-olefin block copolymer.

6. The cleansing wipe of claim 1 , wherein the first ethylene/alpha-olefin interpolymer has an M z,cc /M n,cc less than 3.5.

7. The cleansing wipe of claim 1 , wherein the first ethylene/alpha-olefin interpolymer has a weight fraction (w) of molecular weight greater than 10 5 g/mole, based on the total weight of the first ethylene/alpha-olefin interpolymer, as determined by conventional gel permeation chromatography, of less than 2.5%, or alternatively, less than 1.0%.

8. The cleansing wipe of claim 1 , wherein the first ethylene/alpha-olefin interpolymer has a comonomer distribution breadth index of from 50% to 85%.

9. The cleansing wipe of claim 1 , wherein the moisture content (%) of the cleaning wipe after hangin for 20 minutes is greater than 800%.

10. The cleansing wipe of claim 1 , wherein the cleansing wipe further comprises one or more spunbond nonwovens.

Assignees

• Dow Global Technologies Llc

Inventors

• Huang Xin
• Ren Shijie
• Lin Yijian
• Van Dun Jozef J I

Classifications

• A47K10/16 Primary

  Paper towels; Toilet paper; Holders therefor · CPC title

• B32B5/022

  Non-woven fabric · CPC title

• B32B5/269

  characterised by at least one non-woven fabric layer that is a melt-blown fabric next to a non-woven fabric layer that is a spunbonded fabric · CPC title

• D04H1/4291

  Olefin series · CPC title

• D04H1/43828

  sheath-core · CPC title