Cyanoacrylate compositions

Patent metadata

Field	Value
Publication number	US-2023365836-A1
Application number	US-202318225349-A
Country	US
Kind code	A1
Filing date	Jul 24, 2023
Priority date	Feb 12, 2018
Publication date	Nov 16, 2023
Grant date	—

Abstract

This invention relates to cyanoacrylate-containing compositions that include, in addition to the cyanoacrylate component, a polybutylmethacrylate-polymethylmethacrylate copolymer. The inventive cyanoacrylate compositions load up to nearly a threefold increase of polybutylmethacrylate-polymethylmethacrylate copolymer over conventional polymethylmethacrylate and cured products of the inventive cyanoacrylate compositions demonstrate improved flexibility in terms of modulus (at comparable loading levels as well as increased loading levels compared to conventional polymethylmethacrylate) without compromising stability, fixture time or tensile shear strength.

First claim

1 - 17 . (canceled)

18 . A cyanoacrylate composition comprising
(a) a cyanoacrylate component, (b) a polybutylmethacrylate-polymethylmethacrylate copolymer having a molecular weight below 100,000 Mn, and (c) one or more of a thixotrope, a gelling agent, a thickener, an accelerator, a shock resistance conferring agent, a thermal resistance conferring agent, and a humidity resistance conferring agent.

19 . The composition according to claim 18 , wherein the thixotrope is a fumed silica.

20 . The composition according to claim 18 , wherein the accelerator is selected from the group consisting of calixarene, oxacalixarene, silacrown, cyclodextrin, crown ether, polyethyleneglycol) di(meth)acrylate, ethoxylated hydric compound, and combinations thereof.

21 . The composition according to claim 18 , further comprising a stabilizing amount of an acidic stabilizer and a free radical inhibitor.

22 . Reaction products of the composition according to claim 1 .

23 . A method of bonding together two substrates, comprising the steps of:
applying a cyanoacrylate composition according to claim 18 , to at least one of the substrates, and mating together the substrates for a time sufficient to permit the composition to fixture.

24 . A method of preparing a cyanoacrylate composition according to claim 18 , comprising the steps of:
providing a cyanoacrylate component, and combining therewith with mixing a polybutylmethacrylate-polymethylmethacrylate copolymer.

25 . The composition according to claim 16 , wherein the polybutylmethacrylate-polymethylmethacrylate copolymer has a molecular weight of about 60,000 Mn.

26 . The composition according to claim 18 , wherein the polybutylmethacrylate-polymethylmethacrylate copolymer is present in an amount up to about 50 percent by weight of the total composition.

27 . The composition according to claim 18 , wherein the polybutylmethacrylate-polymethylmethacrylate copolymer is present in an amount in the range of about 2 percent by weight to about 45 percent by weight of the total composition.

28 . The composition according to claim 18 , wherein the polybutylmethacrylate-polymethylmethacrylate copolymer is present in an amount of about 20 percent by weight of the total composition.

29 . The composition according to claim 18 , wherein the composition is flowable at room temperature.

30 . The composition according to claim 18 , wherein the composition has a viscosity up to about 175,000 mPa·s.

31 . The composition according to claim 18 , wherein the polybutylmethacrylate-polymethylmethacrylate copolymer is present in an amount up to about 50 percent by weight of the total composition and a viscosity up to about 175,000 mPa·s.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Kelly Ruth A
• Byrne Laura M

Classifications

• C09J4/06 Primary

  {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09J159/00 - C09J187/00 · CPC title

• C08F220/1804

  C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate · CPC title

• C08F220/14

  Methyl esters {, e.g. methyl (meth)acrylate} · CPC title

• C08K3/36

  Silica · CPC title

• C08K5/315

  Compounds containing carbon-to-nitrogen triple bonds · CPC title