HOT MELT ADHESIVE

• US 20140079919A1
• Filed: 03/15/2013
• Published: 03/20/2014
• Est. Priority Date: 09/19/2012
• Status: Active Grant

• Current Assignee: IFS Industries, Inc.
• Original Assignee: IFS Industries, Inc.
• Inventors: Bunnelle, William L.
• Granted Patent: US 8,865,824 B2
• Time in Patent Office: Days
• US Class Current: 428/195.1
• CPC Class Codes: A61F 13/15756 Applying tabs, strips, tapes, loops; Knotting the ends of pads
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers
• CPC Class Codes: A61F 2013/530481 having superabsorbent materials, i.e. highly absorbent polymer gel materials
• CPC Class Codes: A61F 2013/53908 with adhesive
• CPC Class Codes: A61F 2013/5395 with thermoplastic agent, i.e. softened by heat
• CPC Class Codes: A61L 15/58 Adhesives
• CPC Class Codes: A61L 15/585 Mixtures of macromolecular compounds
• CPC Class Codes: A61L 15/60 Liquid-swellable gel-forming materials, e.g. super-absorbents
• CPC Class Codes: B32B 23/08 of synthetic resin
• CPC Class Codes: B32B 2535/00 Medical equipment, e.g. bandage, prostheses or catheter
• CPC Class Codes: B32B 27/06 as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2205/03 containing three or more polymers in a blend
• CPC Class Codes: C08L 2207/02 Heterophasic composition
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/14 Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C08L 23/142 : at least partially crystalline copolymers of propene with other olefins
• CPC Class Codes: C08L 23/16 : Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
• CPC Class Codes: C08L 23/18 : Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
• CPC Class Codes: C08L 23/20 : having four to nine carbon atoms
• CPC Class Codes: C09J 123/10 : Homopolymers or copolymers of propene
• CPC Class Codes: C09J 123/14 : Copolymers of propene C09J123/16 takes precedence
• CPC Class Codes: C09J 123/142 : at least partially crystalline copolymers of propene with other olefins
• CPC Class Codes: C09J 123/18 : Homopolymers or copolymers of hydrocarbons having four or more carbon atoms
• CPC Class Codes: C09J 123/20 : having four to nine carbon atoms
• CPC Class Codes: C09J 123/22 : Copolymers of isobutene; Butyl rubber ; Homo- or copolymers of other iso-olefines
• CPC Class Codes: C09J 7/21 : Paper; Textile fabrics
• CPC Class Codes: C09J 7/35 : Heat-activated
• CPC Class Codes: Y10T 428/24802 : Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/3188 : Next to cellulosic
• CPC Class Codes: Y10T 428/31909 : Next to second addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31913 : Monoolefin polymer
• CPC Class Codes: Y10T 428/31924 : Including polyene monomers
• CPC Class Codes: Y10T 428/31938 : Polymer of monoethylenically unsaturated hydrocarbon
• CPC Class Codes: Y10T 442/659 : Including an additional nonwoven fabric
• CPC Class Codes: Y10T 442/678 : Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]

Abstract

A hot melt adhesive material and articles made using the hot melt adhesive to assemble structures in an article. The adhesive material typically is manufactured by blending amorphous polymer with a heterophase polymer having crystallinity into an adhesive composition.

Claims

1. A hot melt adhesive composition comprising:

(i) an amorphous polyolefin composition;

(ii) a heterophase polyolefin composition comprising amorphous character and crystalline blocks.

2. The adhesive of claim 1 wherein the amorphous polyolefin has less than 5 wt. % crystallinity, heterophase polyolefin comprises at least about 5 wt. % crystallinity in at least one sequence or block;

wherein the amorphous polymer provides adhesion and the heterophase polymer provides cohesive strength.

3. The adhesive of claim 1 wherein the amorphous polymer comprises greater than 40 wt. % butene and less than 50 wt. % of one or more alpha olefin C₂ or C_4-20 monomers.

4. The adhesive of claim 1 wherein the heterophase polymer comprises greater than 40 wt. % of propene and less than 60 wt. % of one or more alpha olefin C₂ or C_2-20 monomers and comprises polymer blocks or sequences that have a crystallinity of greater than 10%.

5. The adhesive of claim 1 wherein the adhesive is substantially free of a tackifier.

6. The adhesive of claim 1 wherein there is about 50 to 90 wt. % of the amorphous polymer and about 10 to 50 wt. % of the heterophase polymer the heterophase polymer comprising at least 30 wt. % crystallinity.

7. The adhesive of claim 1 wherein the density of the adhesive is less than 0.9 g-cm⁻

3.

8. The adhesive of claim 1 wherein the density of the adhesive is less than 0.87 g-cm⁻

3.

10. The adhesive of claim 7 wherein the heterophase polyolefin comprises at least about 5 wt. % crystalline sequences or blocks.

11. The adhesive of claim 7 wherein the amorphous polymer comprises greater than 40 wt. % butene and less than 50 wt. % of one or more alpha olefin C₂ or C_4-20 monomers.

12. The adhesive of claim 7 wherein the heterophase polymer comprises greater than 40 wt. % of propene and less than 60 wt. % of one or more alpha olefin C₂ or C_2-20 monomers and has a crystallinity of greater than 10%.

13. The adhesive of claim 7 wherein the adhesive is substantially free of a tackifier.

14. The adhesive of claim 7 wherein there is about 50 to 80 wt. % of the amorphous polymer and about 10 to 50 wt. % of the heterophase polymer.

15. The adhesive of claim 7 wherein the plasticizer comprises a polyisobutylene with a molecular weight of about 500 to 2000.

16. The adhesive of claim 7 wherein the density of the adhesive is less than 0.9 g-cm⁻

3.

17. The adhesive of claim 7 wherein the density of the adhesive is less than 0.87 g-cm⁻

3.

18. An article comprising a substrate and a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 1 wherein the adhesive provides cohesive strength from the heterophase polymer and adhesive strength from the amorphous polymer.

19. An article comprising a substrate and a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 7 wherein the adhesive provides cohesive strength from the heterophase polymer and adhesive strength from the amorphous polymer.

20. An article comprising a substrate and a film, fiber, cellulose sheet or non-woven having an adhesive bond there between comprising the adhesive of claim 7 wherein the adhesive provides cohesive strength from the heterophase polymer and adhesive strength from the amorphous polymer.

9. A hot melt adhesive composition consisting essentially of:

(i) about 90 to 10 wt. % of an amorphous polyolefin composition comprising 1-butene;

(ii) about 10 to 90 wt. % of a heterophase polyolefin composition comprising propene and ethylene, 1-hexene or 1-octene and comprising amorphous blocks and crystalline blocks; and

(iii) about 0.1 to 30 wt. % of a plasticizer;

wherein the adhesive provides cohesive strength from the heterophase polymer and adhesive strength form the amorphous polymer.