Hot melt adhesives and uses thereof

Patent metadata

Field	Value
Publication number	US-11970635-B2
Application number	US-202218047380-A
Country	US
Kind code	B2
Filing date	Oct 18, 2022
Priority date	Apr 17, 2015
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

The disclosure relates to adhesive compositions comprising a semi-crystalline olefin polymer or copolymer and a functionalized wax, functionalized olefin polymer, or mixture thereof. These compositions are useful as, for example, adhesives in disposable articles such as diapers, adult incontinence articles, underpads, personal care garments, and the like.

First claim

What is claimed:

1. An article comprising:
a nonwoven substrate;
an elastic strand or an elastic film; and
a stretch adhesive composition consisting of:
(i) about 25 wt. % to about 65 wt. % of a single semi-crystalline propylene co-polymer characterized by
a heat of fusion (ΔHm) is between 20 J/g and 24 J/g;
a DSC melting temperature of 125° C. to 165° C., measured in accordance with ASTM 3418-12;
a storage modulus (E′) at 40° C. and 1 Hz of between about 3.0×10 8 dyn/cm 2 and about 1.7×10 9 dyn/cm 2 ; and
a viscosity (η) at 200° C. of between about 2 Pa·s and about 100 Pa·s,

(ii) about 1 wt. % to about 5 wt. % of an adhesion promoter that is a functionalized polyethylene, functionalized tackifier, functionalized plasticizer, or a mixture thereof;
(iii) about 10 wt. % to about 55 wt. % of a tackifier; and
(iv) optionally, up to 8 wt. % of a plasticizer; up to 2 wt % of an antioxidant, stabilizer, crosslinking agent, filler, colorant, rheology modifier, or a mixture thereof; and up to 10 wt % of a non-functionalized wax;

wherein the stretch adhesive composition exhibits creep resistance of about 35% or less for both an initial creep resistance and an aged creep resistance measured after about 28 days at about 40° C.; and
wherein the wt % is based on the weight of the stretch adhesive composition.

2. The article of claim 1 , wherein the storage modulus at 40° C. and 1 Hz of the semi-crystalline propylene polymer is between about 5.0×10 8 dyn/cm 2 and about 1.1×10 9 dyn/cm 2 .

3. The article of claim 1 , wherein the viscosity of the semi-crystalline propylene polymer at 200° C. is between 20 Pa·s and 24 Pa·s.

4. The article of claim 1 , wherein the adhesion promoter is a functionalized polyethylene.

5. The article of claim 1 , wherein the stretch adhesive composition has a viscosity at 150° C. of between about 7,500 cPs and about 15,000 cPs.

6. The article of claim 1 that is a diaper, sanitary napkin, pet sheet, hospital gown, or surgical garment.

7. The article of claim 6 further comprising a substrate that is tissue, cotton, nonwoven fabric, or polyolefin film.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Dejesus Maria Cristina Barbosa
• Paul Charles W
• Alexis Valerie
• Shah Geetanjaliben

Classifications

• C09J123/12 Primary

  Polypropene · CPC title

• A61L15/24

  Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives thereof {(A61L15/225 takes precedence)} · CPC title

• A61L15/58

  Adhesives · CPC title

• A61L31/048

  obtained by reactions only involving carbon-to-carbon unsaturated bonds (A61L31/041 takes precedence) · CPC title

• B32B5/022

  Non-woven fabric · CPC title