Marking film

Patent metadata

Field	Value
Publication number	US-10358582-B2
Application number	US-201113521903-A
Country	US
Kind code	B2
Filing date	Jan 12, 2011
Priority date	Jan 15, 2010
Publication date	Jul 23, 2019
Grant date	Jul 23, 2019

Abstract

The present application is directed to an acrylic polymer. Specifically, a marking film comprising a film layer which comprises a polymer blend of a first (meth)acrylic polymer having a glass transition temperature of 30 degrees C. to 180 degrees C. and a second (meth)acrylic polymer having a glass transition temperature of over −80 degrees C. less than 30 degrees C. One from the first and second (meth)acrylic polymers comprises a carboxylic group and another comprises an amide group. The marking film additionally comprises an adhesive layer.

First claim

What is claimed is:

1. A marking film comprising:
a film layer comprising a polymer blend of a first (meth)acrylic polymer having a glass transition temperature between about 30 degrees C. and about 180 degrees C. and a second (meth)acrylic polymer having a glass transition temperature higher than −80 degrees C. and less than 30 degrees C.; and
an adhesive layer,
wherein one of the first and second (meth)acrylic polymers comprises a carboxylic group and the other comprises at least one of N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-octyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, and diacetone(meth)acrylamide; and
wherein the first (meth)acrylic polymer and the second (meth)acrylic polymer are present in a mass ratio of less than or equal to 5:2 and greater than 1:1 and each of the first (meth)acrylic polymer and the second (meth)acrylic polymer have a weight average molecular weight of at least 100,000.

2. The marking film according to claim 1 wherein the first (meth)acrylic polymer comprises a carboxylic group and the second (meth)acrylic polymer comprises at least one of N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-octyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, and diacetone(meth)acrylamide.

3. The marking film according to claim 2 wherein
the glass transition temperature of the first (meth)acrylic polymer is between 50 degrees C. and 180 degrees C. and
the first (meth)acrylic polymer comprises 5 to 15 mol % of carboxylic group-containing monomer; and
the second (meth)acrylic polymer comprises 10 to 40 mol % of at least one of N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-octyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, and diacetone(meth)acrylamide.

4. The marking film according to claim 1 wherein
the first (meth)acrylic polymer comprises at least one of N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-octyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, and diacetone(meth)acrylamide; and
the second (meth)acrylic polymer comprises a carboxylic group.

5. The marking film according to claim 4 wherein the first (meth)acrylic polymer has a glass transition temperature that is between 50 degrees C. and 180 degrees C. and comprises 10 to 40 mol % of the at least one of N,N-dimethyl(meth)acrylamide, N,N-diethyl(meth)acrylamide, N-isopropyl(meth)acrylamide, N-octyl(meth)acrylamide, hydroxyethyl(meth)acrylamide, and diacetone(meth)acrylamide; and
the second (meth)acrylic polymer has a glass transition temperature of between 30 degrees C. and −80 degrees C. and comprises 5 to 15 mol % of carboxylic group-containing monomer.

6. The marking film according to claim 5 wherein the content of the first (meth)acrylic polymer is 100 mass parts and the content of the second (meth)acrylic polymer is 40 to 200 mass parts.

7. The marking film according to claim 1 , wherein the adhesive layer comprises an adhesive polymer and:
a cross-linking agent.

8. The marking film according to claim 7 , wherein the amount of the cross-linking agent is between about 0.02 parts to 2 parts by weight based on 100 parts by weight of the adhesive polymer.

9. The marking film according to claim 1 , wherein the first (meth)acrylic polymer and the second (meth)acrylic polymer are present in a mass ratio of less than or equal to 5:2 and greater than or equal to 10:7.

10. The marking film according to claim 9 , wherein the film layer has a tensile break strength of 10 MPa or more.

11. The marking film according to claim 9 , wherein the film layer has a tensile break strength of 20 MPa or more.

12. The marking film according to claim 1 , wherein the film layer has a tensile break strength of 10 MPa or more.

13. The marking film according to claim 1 , wherein the film layer has a tensile break strength of 20 MPa or more.

Assignees

• Abe Hidetoshi
• Takamatsu Yorinobu
• Steelman Ronald S
• Toriumi Naoyuki
• Daniels Michael P
• 3M Innovative Properties Co

Inventors

• Abe Hidetoshi
• Takamatsu Yorinobu
• Steelman Ronald S
• Toriumi Naoyuki
• Daniels Michael P

Classifications

• Y10T428/28

  Web or sheet containing structurally defined element or component and having an adhesive outermost layer · CPC title

• C08K5/3412

  having one nitrogen atom in the ring · CPC title

• C09J2201/622

  Chemistry & Metallurgy · mapped topic

• C08L33/26

  Homopolymers or copolymers of acrylamide or methacrylamide · CPC title

• C08L33/14

  of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen · CPC title