Adhesive Composition

Patent metadata

Field	Value
Publication number	US-2021284884-A1
Application number	US-201917262431-A
Country	US
Kind code	A1
Filing date	Jul 25, 2019
Priority date	Jul 25, 2018
Publication date	Sep 16, 2021
Grant date	—

Abstract

An epoxy-based adhesive composition and methods for manufacturing the same are provided. The adhesive composition provides excellent adhesion strength, peel strength and impact-resistant strength uniformly over a wide temperature range.

First claim

1 . An adhesive composition comprising:
(a) one or more epoxy resins; (b) a urethane resin having a polyether structure; (c) a core-shell rubber in the form of secondary particles, wherein the secondary particles comprise two or more core-shell rubbers in the form of primary particles which are aggregated; and (d) one or more epoxy curing agents.

2 . The adhesive composition according to claim 1 , wherein the one or more epoxy resins comprise a first epoxy resin having an epoxy equivalent of 200 or less.

3 . The adhesive composition according to claim 2 , wherein the one or more epoxy resins comprise a second epoxy resin, wherein the first epoxy resin is a bisphenol F-based epoxy resin and the second epoxy resin is a bisphenol A-based epoxy resin.

4 . The adhesive composition according to claim 3 , wherein the second epoxy resin has an epoxy equivalent in a range of 180 to 500.

5 . The adhesive composition according to claim 3 , wherein the adhesive composition comprises 5 to 300 parts by weight of the second epoxy resin relative to 100 parts by weight of the first epoxy resin.

6 . The adhesive composition according to claim 1 , wherein the urethane resin (b) comprises a branched polyether polyol unit and a non-aromatic isocyanate unit.

7 . The adhesive composition according to claim 6 , wherein the urethane resin (b) has at least one of isocyanate ends terminated with an amine-based compound, a phenol-based compound, an oxime-based compound, or a bisphenol-based compound.

8 . The adhesive composition according to claim 6 , wherein the polyether polyol unit has an OH equivalent in a range of 300 to 2,000.

9 . The adhesive composition according to claim 8 , wherein the polyether polyol unit has an OH equivalent in the range of 400 to 1,100.

10 . The adhesive composition according to claim 7 , wherein the polyether polyol unit is branched polypropylene glycol.

11 . The adhesive composition according to claim 1 , wherein the urethane resin (b) is included in a range of 5 to 25 parts by weight based on a total content of the adhesive composition.

12 . The adhesive composition according to claim 1 , wherein the two or more core-shell rubbers in the form of primary particles have an average particle diameter of 250 nm to 500 nm.

13 . The adhesive composition according to claim 12 , wherein cores in the two or more core-shell rubbers in the form of primary particles have an average particle diameter of 180 to 495 nm.

14 . The adhesive composition according to claim 12 , wherein cores in the two or more core-shell rubbers in the form of primary particles have an average particle diameter of 280 to 490 nm.

15 . The adhesive composition according to claim 12 , wherein the two or more core-shell rubbers in the form of primary particles have a ratio of a core particle diameter to a total particle diameter of core-shell particles satisfying 0.8 to 0.99.

16 . The adhesive composition according to claim 1 , wherein the core-shell rubber has butadiene-based cores.

17 . The adhesive composition according to claim 1 , wherein the adhesive composition comprises 5 to 35 parts by weight of the core-shell rubber in the form of secondary particles (c) based on a total content of the adhesive composition.

18 . The adhesive composition according to claim 16 , wherein the adhesive composition has a total rubber content of 10 parts by weight or more based on a total content of the adhesive composition.

19 . A structure comprising a cured product of the adhesive composition according to claim 1 ; and
a base material in contact with the cured product.

20 . A method for producing a structure comprising:
applying the adhesive composition according to claim 1 to a surface of a base material; and curing the adhesive composition applied to the surface of the base material.

Assignees

• Lg Chemical Ltd

Inventors

• Ko Min Jin
• Jung Jae Ho
• Yu Min A
• Kim Min Kyoun
• Cho Byung Kyu
• Lee Taek Yong
• Kim Dong Yong

Classifications

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C09J175/16

  having terminal carbon-to-carbon unsaturated bonds · CPC title

• C09J2451/00

  Presence of graft polymer · CPC title

• C09J163/04 Primary

  Epoxynovolacs · CPC title

• C09J2475/00

  Presence of polyurethane · CPC title