Epoxy adhesive compositions comprising an adhesion promoter

Patent metadata

Field	Value
Publication number	US-2017044408-A1
Application number	US-201615335813-A
Country	US
Kind code	A1
Filing date	Oct 27, 2016
Priority date	Mar 31, 2010
Publication date	Feb 16, 2017
Grant date	—

Abstract

Curable adhesive compositions comprising
vi. a curable epoxy resin vii. an amine curing agent, viii. a polymeric toughening agent, ix. a filler and x. a phosphoric acid ester according to the formula

as an adhesion promoter, wherein R represents an aliphatic or aromatic residue that contains one or more carboxylic acid ester units and/or one or more urethane units and that further contains at least one ether group and n represents an integer of 1 or 2, methods of making them, bonded articles and methods for bonding.

First claim

1 . A construction comprising a curable epoxy adhesive composition comprising
vi. a curable epoxy resin vii. an amine curing agent, viii a polymeric toughening agent, ix. an aluminium hydroxide filler material present in an amount of from 15 to 60 weight percent relative to the overall weight of the composition, and x. a phosphoric acid ester according to the formula

wherein R represents an aliphatic or aromatic residue that contains one or more carboxylic acid ester units and/or one or more urethane units and that further contains at least one ether group and n represents an integer of 1 or 2; and
first and second substrates, wherein the first and second substrates are selected independently from each other from aluminium, steel and a resin-based composite material;
wherein the curable epoxy adhesive composition is between and in contact with both the first and second substrate.

2 . The construction according to claim 1 wherein the group R of the phosphoric acid ester has a molecular weight between 200 and 10,000.

3 . The construction according to claim 1 wherein the curable epoxy resin comprises one or more aromatic glycidyl ether units.

4 . The construction according to claim 1 wherein the epoxy resin has a molecular weight of from 150 to 4,000 g/mole.

5 . The construction according to claim 1 wherein the epoxy resin has a functionality of from 1 to 3.8

6 . The construction according to claim 1 wherein the curable epoxy resin comprises further comprises glass particles.

7 . The construction according to claim 1 wherein the amine curing agent comprises a polyamido amine.

8 . The construction according to claim 1 wherein the polymer toughening agent comprises a core shell polymer.

9 . The construction according to claim 1 wherein the composition comprises a liquid polymer comprising repeating units derived from butadiene.

10 . The construction according to claim 1 wherein the composition further comprises at least one phosphorous-containing material.

11 . An article comprising a first substrate, a second substrate and a composition between the first and second substrate bonding the first substrate to the second substrate, said composition comprising the reaction product of a curing reaction of a curable epoxy adhesive composition comprising
vi. a curable epoxy resin vii. an amine curing agent, viii a polymeric toughening agent, ix. an aluminium hydroxide filler material present in an amount of from 15 to 60 weight percent relative to the overall weight of the composition, and x. a phosphoric acid ester according to the formula

wherein R represents an aliphatic or aromatic residue that contains one or more carboxylic acid ester units and/or one or more urethane units and that further contains at least one ether group and n represents an integer of 1 or 2; and wherein the first and second substrates are selected independently from each other from aluminium, steel and a resin-based composite material.

12 . The article according to claim 11 wherein the group R of the phosphoric acid ester has a molecular weight between 200 and 10,000.

13 . The article according to claim 11 wherein the curable epoxy resin comprises one or more aromatic glycidyl ether units.

14 . The article according to claim 11 wherein the curable epoxy adhesive composition further comprises glass particles.

15 . The article according to claim 11 wherein the amine curing agent comprises a polyamido amine.

16 . The article according to claim 11 wherein the polymer toughening agent comprises a core shell polymer.

17 . The article according to claim 11 wherein the curable epoxy adhesive composition further comprises a liquid polymer comprising repeating units derived from butadiene.

18 . A method for bonding a first substrate to a second substrate comprising adding to at least a part of the first substrate a curable epoxy adhesive composition comprising
vi. a curable epoxy resin vii. an amine curing agent, viii a polymeric toughening agent, ix. a filler material and x. a phosphoric acid ester according to the formula

wherein R represents an aliphatic or aromatic residue that contains one or more carboxylic acid ester units and/or one or more urethane units and that further contains at least one ether group and n represents an integer of 1 or 2;
(ii) applying the second substrate to the first substrate at a position where the first substrate contains the curable composition
(iv) subjecting the curable epoxy adhesive composition to curing, wherein the first and second substrate are selected independently from each other from aluminium, steel and a resin-based composite material.

19 . The method according to claim 18 wherein the curable epoxy adhesive composition is applied directly to the surface or the first or the second surface or is directly applied to the first and the second surface.

20 . The method according to claim 18 wherein the curing is carried out at room temperature.

Assignees

• 3M Innovative Properties Co

Inventors

• Elgimiabi Sohaib

Classifications

• B32B5/02

  characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} · CPC title

• C08K3/22

  of metals · CPC title

• B32B2311/24

  Aluminium · CPC title

• B32B7/12

  using interposed adhesives or interposed materials with bonding properties · CPC title

• B32B15/20

  comprising aluminium or copper {(B32B15/016 and B32B15/017 take precedence)} · CPC title