Adhesive compositions, adhesive articles and methods for making the same

Patent metadata

Field	Value
Publication number	US-9580562-B2
Application number	US-201414186135-A
Country	US
Kind code	B2
Filing date	Feb 21, 2014
Priority date	Jun 20, 2006
Publication date	Feb 28, 2017
Grant date	Feb 28, 2017

Abstract

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.

First claim

What is claimed is:

1. A method of irradiating an article with an electron beam, said method comprising:
providing an electron beam source;
providing an article comprising a layer of a material comprising a blend of
(i) a first acrylic copolymer resulting from polymerization of one or more monomers A and one or more monomers B, wherein the first acrylic copolymer has a number average molecular weight, M n , ranging from about 150,000 to about 600,000; and
(ii) a second acrylic copolymer resulting from polymerization of one or more monomers C and one or more monomers D, wherein the second acrylic copolymer has a number average molecular weight, M n , ranging from about 10,000 to about 70,000;

wherein monomers B and monomers D have at least one reactive group that is capable of hydrogen bonding; the second acrylic copolymer comprises greater than about 10 total parts by weight of the monomers D based a total weight of the second acrylic copolymer; and the total parts by weight of the monomers D in the second acrylic copolymer is greater than the total parts by weight of the monomers B in the first acrylic copolymer;
preparing dose-depth profile calibration curves for the electron beam source, wherein at least one of the dose-depth calibration curves exhibits a concave downward dose-depth profile;
selecting a concave downward dose-depth profile of irradiation; and
irradiating the article comprising the layer material at a voltage and dose according to the selected concave downward dose-depth profile of irradiation, resulting in an irradiated article;

wherein irradiating according to the selected concave downward dose-depth profile of irradiation exhibits a minimum of irradiation within a middle 80% of a thickness of the article.

2. A method of irradiating an article with an electron beam, said method comprising:
providing an electron beam source;
providing an article comprising a layer of a material comprising a blend of
(i) a first acrylic copolymer resulting from polymerization of one or more monomers A and one or more monomers B, wherein the first acrylic copolymer has a number average molecular weight, M n , ranging from about 150,000 to about 600,000; and
(ii) a second acrylic copolymer resulting from polymerization of one or more monomers C and one or more monomers D, wherein the second acrylic copolymer has a number average molecular weight, M n , ranging from about 10,000 to about 70,000;

wherein monomers B and monomers D have at least one reactive group that is capable of hydrogen bonding; the second acrylic copolymer comprises greater than about 10 total parts by weight of the monomers D based a total weight of the second acrylic copolymer; and the total parts by weight of the monomers D in the second acrylic copolymer is greater than the total parts by weight of the monomers B in the first acrylic copolymer;
preparing dose-depth profile calibration curves for the electron beam source, wherein at least one of the dose-depth calibration curves exhibits a concave downward dose-depth profile;
selecting a concave downward dose-depth profile of irradiation; and
irradiating the article comprising the layer material at a voltage and dose according to the selected concave downward dose-depth profile of irradiation, resulting in an irradiated article;

wherein irradiating according to the selected concave downward dose-depth profile of irradiation exhibits a minimum of irradiation within a middle 50% of a thickness of the article.

3. A method of irradiating an article with an electron beam, said method comprising:
providing an electron beam source;
providing an article comprising a layer of a material comprising a blend of
(i) a first acrylic copolymer resulting from polymerization of one or more monomers A and one or more monomers B, wherein the first acrylic copolymer has a number average molecular weight, M n , ranging from about 150,000 to about 600,000; and
(ii) a second acrylic copolymer resulting from polymerization of one or more monomers C and one or more monomers D, wherein the second acrylic copolymer has a number average molecular weight, M n , ranging from about 10,000 to about 70,000;

wherein monomers B and monomers D have at least one reactive group that is capable of hydrogen bonding; the second acrylic copolymer comprises greater than about 10 total parts by weight of the monomers D based a total weight of the second acrylic copolymer; and the total parts by weight of the monomers D in the second acrylic copolymer is greater than the total parts by weight of the monomers B in the first acrylic copolymer;
preparing dose-depth profile calibration curves for the electron beam source, wherein at least one of the dose-depth calibration curves exhibits a concave downward dose-depth profile;
selecting a concave downward dose-depth profile of irradiation; and
irradiating the article comprising the layer material at a voltage and dose according to the selected concave downward dose-depth profile of irradiation, resulting in an irradiated article;

wherein the irradiated article exhibits a measured stress-relaxation ratio in a range from about 0.1 to about 0.4.

Assignees

• 3M Innovative Properties Co

Inventors

• Daniels Michael P
• Laperre James D
• Meyer Scott R
• Jennen Jay M

Classifications

• C08J3/28 Primary

  Treatment by wave energy or particle radiation · CPC title

• C08L2666/04

  Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof · CPC title

• C09J133/04 Primary

  Homopolymers or copolymers of esters {(C09J143/04 takes precedence)} · CPC title

• Y10T428/2848

  Three or more layers · CPC title

• C08L33/04

  Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} · CPC title