Acrylic hot melt adhesives

Patent metadata

Field	Value
Publication number	US-9371471-B2
Application number	US-30043206-A
Country	US
Kind code	B2
Filing date	May 11, 2006
Priority date	May 11, 2006
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

Radiation curable adhesive compositions comprising an acrylic polymer and a polyolefin find use in the manufacture of pressure sensitive adhesive articles such as, for example, tapes.

First claim

The invention claimed is:

1. A radiation curable adhesive composition consisting essentially of a mixture of:
(A) an acrylic polymer covalently bound to a photoinitiator that comprises a benzophenone group;
(B) an antioxidant; and
(C) a semicrystalline or amorphous polyolefin, which is a polyethylene, ethylene/α-olefin interpolymer, poly-(butene-1-co-ethylene), atactic polypropylene, low density polyethylene, homogeneous linear ethylene/α-olefin copolymer, ethylene vinyl acetate copolymer, ethylene n-butyl acrylate copolymer or combination thereof;

wherein the mixture forms a transparent blend in at temperatures from about 130° C. to about 150° C.

2. The composition of claim 1 further consisting essentially of a tackifier.

3. The composition of claim 2 wherein the tackifier is a hydrogenated rosin ester and/or rosin acid.

4. The composition of claim 1 wherein the acrylic polymer comprises a C4 to C8 alkyl acrylate.

5. The composition of claim 4 wherein the acrylic polymer comprises 2-ethylhexyl acrylate.

6. The composition of claim 1 wherein the polyolefin is ethylene vinyl acetate copolymer.

7. The composition of claim 1 further consisting essentially of a multifunctional acrylic monomer.

8. The composition of claim 1 which has been cured by UV irradiation.

9. The composition of claim 1 , wherein said antioxidant is present in an amount of about 0.1% to about 3% by weight.

10. The composition of claim 1 , wherein said semicrystalline or amorphous polyolefin is present in an amount of about 10% to about 30% by weight.

11. An article to be adhesively adhered to a substrate surface, which article comprises a backing substrate having coated on at least one surface thereof the composition of claim 8 .

12. The article of claim 11 which is a tape.

13. The article of claim 12 which is a medical tape.

14. A radiation curable adhesive composition comprising a mixture of:
(A) a polymer blend consisting of (i) a 2-ethylhexyl acrylate copolymer with a pendant benzophenone group and (ii) a polyolefin, which is a polyethylene, ethylene/α-olefin interpolymer, poly-(butene-1-co-ethylene), atactic polypropylene, low density polyethylene, homogeneous linear ethylene/α-olefin copolymer, ethylene vinyl acetate copolymer, or ethylene n-butyl acrylate copolymer; and
(B) a tackifier; and

wherein the mixture is transparent at temperatures from about 130° C. to about 150° C.

Assignees

• Palasz Peter D
• Henkel Ag & Co Kgaa

Inventors

• Palasz Peter D

Classifications

• C09J2433/00

  Presence of (meth)acrylic polymer · CPC title

• C09J123/08

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

• Y10T428/2891

  including addition polymer from alpha-beta unsaturated carboxylic acid [e.g., acrylic acid, methacrylic acid, etc.] Or derivative thereof · CPC title

• C09J133/02

  Homopolymers or copolymers of acids; Metal or ammonium salts thereof · CPC title

• A61L15/58 Primary

  Adhesives · CPC title