IP Library › Patent Application 18497729
Patent Application
App. No. 18/497,729

TWO-PART, CYANOACRYLATE/FREE RADICALLY CURABLE ADHESIVE SYSTEMS

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Quick Facts
Patent No.
US None
App. No.
18/497,729
Abstract

Two part cyanoacrylate/free radical curable adhesive systems are provided.

Claims (17)

1 . A two part curable composition comprising:

(a) a first part comprising a cyanoacrylate component and a peroxide component; and

(b) a second part comprising a free radical curable component and a transition metal, at least a portion of which comprises a polyester urethane (meth)acrylate having a Tg of greater than about 50° C., and

wherein the second part further comprises one or more of an aliphatic urethane diacrylate having a Tg of greater than about 30° C.; an anhydride; and at least one maleimide-, itaconimide- or nadimide-containing compound.

2 . The composition of claim 1 , wherein the polyester urethane (meth)acrylate and the aliphatic urethane diacrylate are present in about a 2:1 by weight ratio.

3 . The composition of claim 1 , wherein the polyester urethane (meth)acrylate has a molecular weight of about 2000 to about 5000 Mn.

4 . The composition of claim 1 , wherein the aliphatic urethane diacrylate has a molecular weight of about 900 to about 1900 Mn.

5 . The composition of claim 1 , wherein when the first part and the second part are mixed together the peroxide component initiates cure of the free radical curable component.

6 . The composition of claim 1 , wherein when the first part and the second part are mixed together and cured, a cured composition demonstrates at least one of lap shear strength on epoxy substrates of greater than 1000 psi and hot strength at a temperature of 120° C. on grit blasted mild steel substrates of greater than 300 psi.

7 . The composition of claim 1 , wherein the polyester urethane (meth)acrylate has a Tg of greater than about 60° C.

8 . The composition of claim 1 , wherein the polyester urethane (meth)acrylate has a Tg of greater than about 70° C.

9 . The composition of claim 1 , wherein the polyester urethane (meth)acrylate has a molecular weight of about 3500 Mn.

10 . The composition of claim 1 , wherein the aliphatic urethane diacrylate has a molecular weight of about 1400 Mn.

11 . The composition of claim 1 , wherein when the first part and the second part are mixed together and cured, a cured composition demonstrates at least one of lap shear strength on epoxy substrates of greater than 1500 psi and hot strength at a temperature of 120° C. on grit blasted mild steel substrates of greater than 500 psi.

12 . The composition of claim 1 , wherein the second part comprises a polyester urethane (meth)acrylate having a Tg of greater than about 50° C. and an aliphatic urethane diacrylate having a Tg of greater than about 30° C.

13 . The composition of claim 1 , wherein the anhydride has a molecular weight of about 5400 Mn.

14 . The composition of claim 1 , wherein the first part and the second part are present in a ratio of about 1:1 by volume.