Adhesive composition for absorbent articles

Patent metadata

Field	Value
Publication number	US-2019322909-A1
Application number	US-201916387689-A
Country	US
Kind code	A1
Filing date	Apr 18, 2019
Priority date	Apr 20, 2018
Publication date	Oct 24, 2019
Grant date	—

Abstract

Described herein is an adhesive composition including (a) from about 70 wt. % to about 90 wt. % of one or more copolymers, and (b) from about 10 wt. % to about 30 wt. % of one or more heterophase copolymers. The one or more copolymers include (i) from about 30 mole % to about 70 mole % of monomer units selected from the group consisting of ethylene, 1-butene, and mixtures thereof; and (ii) from about 30 mole % to about 70 mole % of propene monomer units. The adhesive composition is free of polyisobutylene. The adhesive composition has a viscosity of from about 2,000 mPa·s to about 11,500 mPa·s at 150° C. The one or more heterophase copolymers includes a first heterophase copolymer and a second heterophase copolymer.

First claim

What is claimed is:

1 . An adhesive composition comprising:
(a) from about 70 wt. % to about 90 wt. % of one or more copolymers, wherein the one or more copolymers comprise (i) from about 30 mole % to about 70 mole % of monomer units selected from the group consisting of ethylene, 1-butene, and mixtures thereof; and (ii) from about 30 mole % to about 70 mole % of propene monomer units; (b) from about 10 wt. % to about 30 wt. % of one or more heterophase copolymers; (c) wherein the adhesive composition is free of polyisobutylene; (d) wherein the adhesive composition has a viscosity of from about 2,000 mPa·s to about 11,500 mPa·s at 150° C., as measured by the Viscosity Test Method; (e) wherein the one or more heterophase copolymers comprises a first heterophase copolymer and a second heterophase copolymer; (f) wherein the adhesive composition comprises from about 5 wt. % to about 15 wt. % of the first heterophase copolymer and from about 5 wt. % to about 15 wt. % of the second heterophase copolymer; and (g) wherein the first heterophase copolymer has a higher Enthalpy of Fusion than the second heterophase copolymer, as measured by the Enthalpy of Fusion Test Method.

2 . The adhesive composition of claim 1 , wherein adhesive composition has a Static Peel Time of at least 220 seconds, as measured by the Static Peel Time Test Method.

3 . The adhesive composition of claim 1 , wherein the adhesive composition has an Enthalpy of Fusion of less than 15 J/g.

4 . The adhesive composition of claim 1 , wherein the viscosity of the adhesive composition is less than 7,000 mPa·s at 150° C.

5 . The adhesive composition of claim 1 , wherein the viscosity of the adhesive composition is from about 4,000 mPa·s to about 6,500 mPa·s at 150° C.

6 . The adhesive composition of claim 1 , wherein the copolymer comprises from about 30 wt. % to about 70 wt. % 1-butene monomer units.

7 . The adhesive composition of claim 1 , wherein the adhesive composition is free of a tackifier.

8 . The adhesive composition of claim 1 , wherein the adhesive composition has a density of from about 0.5 g/cm 3 to 0.85 g/cm 3 at 150° C.

9 . The adhesive composition of claim 1 , wherein the one or more copolymers comprise a first copolymer and a second copolymer, and wherein the adhesive composition comprises from about 35 wt. % to about 80 wt. % of the first copolymer and from about 10 wt. % to about 35 wt. % of the second copolymer.

10 . An adhesive composition comprising:
(a) from about 50 wt. % to about 80 wt. % of one or more copolymers, wherein the one or more copolymers comprise (i) from about 30 mole % to about 70 mole % of monomer units selected from the group consisting of ethylene, 1-butene, and mixtures thereof; and (ii) from about 30 mole % to about 70 mole % of propene monomer units; (b) from about 20 wt. % to about 50 wt. % of one or more heterophase copolymers; (c) wherein the adhesive composition is free of polyisobutylene; (d) wherein the adhesive composition has a viscosity of from about 2,000 mPa·s to about 11,500 mPa·s at 150° C., as measured by the Viscosity Test Method; (e) wherein the adhesive composition has an Enthalpy of Fusion of less than 15 J/g, as measured by the Enthalpy of Fusion Test Method; and (f) wherein the one or more copolymers comprises a first copolymer and a second copolymer, and wherein the adhesive composition comprises from about 40 wt. % to about 75 wt. % of the first copolymer and from about 5 wt. % to about 40 wt. % of the second copolymer.

11 . The adhesive composition of claim 10 , wherein the adhesive composition has a Static Peel Time of at least 220 seconds, as measured by the Static Peel Time Test Method.

12 . The adhesive composition of claim 10 , wherein the one or more heterophase copolymers comprises a first heterophase copolymer and a second heterophase copolymer; wherein the adhesive composition comprises from about 10 wt. % to about 25 wt. % of the first heterophase copolymer and from about 10 wt. % to about 25 wt. % of the second heterophase copolymer; and wherein the first heterophase copolymer has a higher Enthalpy of Fusion than the second heterophase copolymer, as measured by the Enthalpy of Fusion Test Method.

13 . The adhesive composition of claim 10 , wherein the viscosity of the adhesive composition is from about 2,000 mPa·s to about 7,000 mPa·s at 150° C.

14 . The adhesive composition of claim 10 , wherein the viscosity of the adhesive composition is from about 4,000 mPa·s to about 6,500 mPa·s at 150° C.

15 . The adhesive composition of claim 10 , wherein the copolymer comprises from about 30 wt. % to about 70 wt. % 1-butene monomer units.

16 . The adhesive composition of claim 10 , wherein the adhesive composition is free of a tackifier.

17 . The adhesive composition of claim 10 , wherein the adhesive composition has a density of from about 0.5 g/cm 3 to 0.85 g/cm 3 at 150° C.

18 . An adhesive composition comprising:
(a) from about 70 wt. % to about 90 wt. % of one or more copolymers, wherein the one or more copolymers comprise (i) from about 30 mole % to about 70 mole % of 1-butene monomer units; and (ii) from about 30 mole % to about 70 mole % of propene monomer units; (b) from about 10 wt. % to about 30 wt. % of one or more heterophase copolymers; (c) wherein the adhesive composition is free of polyisobutylene; (d) wherein the adhesive composition has a viscosity of from about 2,000 mPa·s to about 11,500 mPa·s at 150° C., as measured by the Viscosity Test Method; (e) wherein the adhesive composition has an Enthalpy of Fusion of less than 15 J/g, according to the Enthalpy of Fusion Test Method; and (f) wherein the one or more copolymers comprises a first copolymer and a second copolymer, and wherein the adhesive composition comprises from about 35 wt. % to about 80 wt. % of the first copolymer and from about 10 wt. % to about 35 wt. % of the second copolymer.

19 . The adhesive composition of claim 18 , wherein the adhesive composition is free of a tackifier.

20 . The adhesive composition of claim 18 , wherein the adhesive composition has a density of from about 0.5 g/cm 3 to 0.85 g/cm 3 at 150° C.

Assignees

• Procter & Gamble

Inventors

• Turner Robert Haines
• Lindner Torsten
• Morand Matthias
• Kutay Benjamin John
• Beruda Holger
• Ponomarenko Ekaterina
• Bunnelle William L
• Fagerness Jon
• Fowler Nick
• Turner Bill
• Sustic Andres
• Buenacosa Enrico
• Oetting Steve
• Mchaney Steve
• Decair J J

Classifications

• C09J123/142

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C09J123/20 Primary

  having four to nine carbon atoms · CPC title

• C09J123/14

  Copolymers of propene (C09J123/16 takes precedence) · CPC title

• C08L2205/035

  containing four or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title