FreshPatents.com Logo
stats FreshPatents Stats
2 views for this patent on FreshPatents.com
2012: 2 views
Updated: April 14 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

AdPromo(14K)

Follow us on Twitter
twitter icon@FreshPatents

Adhesive compositions, adhesive articles and methods for making the same

last patentdownload pdfdownload imgimage previewnext patent


20120276379 patent thumbnailZoom

Adhesive compositions, adhesive articles and methods for making the same


Adhesive compositions comprising a high molecular weight acrylic copolymer and a low molecular weight copolymer are disclosed. Adhesive articles and methods of making adhesive compositions and articles are also described.

Browse recent 3m Innovative Properties Company patents - ,
Inventors: Michael P. Daniels, James D. Laperre, Scott R. Meyer, Jay M. Jennen
USPTO Applicaton #: #20120276379 - Class: 428354 (USPTO) - 11/01/12 - Class 428 
Stock Material Or Miscellaneous Articles > Web Or Sheet Containing Structurally Defined Element Or Component >Adhesive Outermost Layer >Three Or More Layers

view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120276379, Adhesive compositions, adhesive articles and methods for making the same.

last patentpdficondownload pdfimage previewnext patent

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a divisional of U.S. Application Ser. No. 12/304,186, filed Jun. 19, 2007, now pending, which is national stage filing under 35 U.S.C. 371 of PCT/US2007/071551, filed Jun. 19, 2007, which claims priority to U.S. Provisional Patent Application No. 60/815,078, filed Jun. 20, 2006, the disclosures of which are incorporated by reference in their entirety herein.

FIELD

The present disclosure relates to adhesive compositions comprising a high molecular weight acrylic copolymer and a low molecular weight acrylic copolymer.

SUMMARY

In one aspect, the present disclosure is directed to adhesive compositions comprising a blend of a first acrylic copolymer and a second acrylic copolymer. In one exemplary embodiment, the adhesive article comprises a blend of a first acrylic copolymer resulting from polymerization of monomers A and B, wherein (i) the first acrylic copolymer has a number average molecular weight, Mn, of at least about 150,000 (or a weight average molecular weight, Mw, of at least about 450,000), and (ii) monomer B has at least one reactive group that is capable of hydrogen bonding. The second acrylic copolymer results from polymerization of monomers C and D, wherein (i) the second acrylic copolymer has a number average molecular weight, Mn, of less than about 70,000 (or a Mw less than about 100,000), (ii) monomer D has at least one reactive group that is capable of hydrogen bonding, and (iii) the second acrylic copolymer comprises greater than about 10 parts by weight (pbw) of monomer D based on a total weight of the second acrylic copolymer. In some embodiments, the pbw of monomer D in the second acrylic copolymer is greater than the pbw of monomer B in the first acrylic copolymer. In some embodiments, the pbw of monomer D in the second acrylic copolymer is at least about 3 pbw greater than the pbw of monomer B in the first acrylic copolymer.

In a further exemplary embodiment of the present disclosure, the adhesive article comprises a blend of (1) a first acrylic copolymer formed from monomers A and B, wherein the first acrylic copolymer (i) has a number average molecular weight, Mn, of at least about 150,000 (or a Mw of at least about 450,000) and (ii) comprises less than about 10 percent by weight (pbw) of monomer B based on a total weight of the first acrylic copolymer, wherein monomer B has at least one reactive group that is capable of hydrogen bonding; and (2) a second acrylic copolymer formed from monomers C and D, wherein the second acrylic copolymer (i) has a number average molecular weight, Mn, of less than about 70,000 (or a Mw less than about 100,000) and (ii) comprises greater than about 10 pbw of monomer D based on a total weight of the second acrylic copolymer.

In yet a further exemplary embodiment of the present disclosure, the adhesive article comprises an adhesive foam layer comprising a mixture of a first acrylic copolymer and a second acrylic copolymer, wherein the first acrylic copolymer (i) is formed from monomers A and B, wherein monomer B has at least one reactive group that is capable of hydrogen bonding, (ii) has a number average molecular weight, Mn, of at least about 150,000 (or a Mw of at least about 450,000) and (iii) comprises less than about 10.0 percent by weight (pbw) of monomer B based on a total weight of the first acrylic copolymer; and the second acrylic copolymer (i) is formed from monomers B and C, (ii) has a number average molecular weight, Mn, of less than about 70,000 (or a Mw of less than about 100,000) and (iii) comprises a percent by weight (pbw) of monomer B based on a total weight of the second acrylic copolymer, wherein the pbw of monomer B of the second acrylic copolymer is greater than the pbw of monomer B of the first acrylic copolymer.

In another aspect, the present disclosure provides adhesive articles comprising one or more adhesive core layers and, optionally, one or more additional layers. In one exemplary embodiment of the present disclosure, the adhesive article comprises (a) an adhesive core layer comprising the above-described blend or mixture of a first acrylic copolymer having a relatively high molecular weight and a second acrylic copolymer having a relatively low molecular weight; and (b) at least one additional layer on a major surface of the adhesive core layer. The adhesive article of the present disclosure may further comprise other layers including, but not limited to, a second adhesive layer, such as a pressure-sensitive adhesive layer and/or a heat-activatable adhesive layer, at least one release liner, at least one non-adhesive substrate layer, or any combination thereof.

In another aspect, the present disclosure is further directed to methods of making adhesive articles. In one exemplary embodiment, the method of making an adhesive article comprises the steps of extruding a blend of (1) a first acrylic copolymer formed from monomers A and B, wherein the first acrylic copolymer (i) has a number average molecular weight, Mn, of at least about 150,000 (or a Mw of at least about 450,000) and (ii) comprises less than about 10 percent by weight (pbw) of monomer B based on a total weight of the first acrylic copolymer, wherein monomer B has at least one reactive group that is capable of hydrogen bonding; and (2) a second acrylic copolymer formed from monomers C and D, wherein the second acrylic copolymer (i) has a number average molecular weight, Mn, of less than about 70,000 (or a Mw of less than about 100,000) and (ii) comprises greater than about 10 pbw of monomer D based on a total weight of the second acrylic copolymer; and exposing the extrudate to an amount of irradiation so as to obtain a controlled degree of crosslinking between the first acrylic copolymer and the second acrylic copolymer. Desirably, the controlled degree of crosslinking between the first acrylic copolymer and the second acrylic copolymer results in a crosslinked adhesive article having a stress relaxation ratio G(300)/G(0.1) as measured by a Stress Relaxation Test at 70° C. of less than or equal to about 0.30, desirably, from about 0.13 to about 0.30.

In another exemplary embodiment, the method of making an adhesive article comprises providing an electron beam generating apparatus having a first control for an accelerating voltage and a second control for a dose; providing a material to be cured having a composition, a thickness, and a density; determining one or more desired properties capable of resulting from a controlled amount of crosslinking using the electron beam generating apparatus; and using a Minimum Calculated Core Cure value of the material based on dose-depth profile calibration curves for the electron beam generating apparatus and for the material to be cured, crosslinking the material at a voltage and dose that results in the one or more desired properties. The exemplary method may further comprise preparing the dose-depth profile calibration curves for the electron beam generating apparatus and for the material to be cured based on the composition, thickness, and density of the material; and determining the Minimum Calculated Core Cure value based on the dose-depth profile calibration curves.

These and other features and advantages of the present disclosure will become apparent after a review of the following detailed description of the disclosed embodiments and the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a cross-sectional view of an exemplary adhesive article according to some embodiments of the present disclosure;

FIG. 2 is a cross-sectional view of an exemplary tape according to some embodiments of the present disclosure in roll form comprising an exemplary adhesive article having a removable release liner on an outer surface thereon;

FIG. 3 is a schematic drawing of an exemplary extrusion process for preparing adhesive articles according to some embodiments of the present disclosure;

FIG. 4 provides an exemplary graph showing electron beam radiation dose versus tape depth for the sample tape of Example 1 after electron beam radiation exposure to one outer surface;

FIG. 5 provides an exemplary graph showing electron beam radiation dose versus tape depth for the sample tape of Example 1 after electron beam radiation exposure to both outer surfaces;

FIG. 6 provides an exemplary graph showing electron beam radiation dose versus tape depth for the sample tape of Example 1 after electron beam radiation exposure to both outer surfaces at a lower accelerating voltage than used in the trial shown in FIG. 5;

FIG. 7 provides an exemplary graph showing Stress Relaxation at 70° C. versus Minimum Calculated Core Cure for sample tapes of Examples 1-8; and

FIG. 8 provides an exemplary graph showing Stress Relaxation at 70° C. versus the product of the Average Calculated Core Cure (ACCC) and the Minimum Calculated Core Cure (MCCC) for sample tapes of Examples 1-8.



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Adhesive compositions, adhesive articles and methods for making the same patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Adhesive compositions, adhesive articles and methods for making the same or other areas of interest.
###


Previous Patent Application:
Cover tape, method for manufacturing cover tape, and electronic part package
Next Patent Application:
Double-coated pressure-sensitive adhesive sheet for optical use
Industry Class:
Stock material or miscellaneous articles
Thank you for viewing the Adhesive compositions, adhesive articles and methods for making the same patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 1.11699 seconds


Other interesting Freshpatents.com categories:
Electronics: Semiconductor Audio Illumination Connectors Crypto ,  -g2-0.5184
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120276379 A1
Publish Date
11/01/2012
Document #
13546279
File Date
07/11/2012
USPTO Class
428354
Other USPTO Classes
521134, 522112
International Class
/
Drawings
6



Follow us on Twitter
twitter icon@FreshPatents