Activator composition, adhesive system comprising the same, and method of bonding sustrates using the same

Patent metadata

Field	Value
Publication number	US-2016194435-A1
Application number	US-201414910077-A
Country	US
Kind code	A1
Filing date	Sep 11, 2014
Priority date	Sep 19, 2013
Publication date	Jul 7, 2016
Grant date	—

Abstract

A novel activator composition having good storage stability and capable of providing a long open time and good adhesion performance in combination with an adhesive, an adhesive system comprising the composition, and a method of bonding substrates together using the activator composition or the adhesive system.

First claim

1 . A composition comprising:
(a) a phenolic compound containing at least two hydroxyl groups in meta position, (b) an aromatic polyisocyanate compound having more than two isocyanate groups, and (c) a solvent, wherein the molar ratio of total hydroxyl groups to total isocyanate groups of the composition is from 1.6 to 3.0, and the composition has a solids content from 7 to 50 wt % based on the total weight of the composition; and wherein isocyanate content of the composition changes less than 10% after 6-week storage at 40° C.

2 . The composition of claim 1 , wherein the molar ratio of total hydroxyl groups to total isocyanate groups is from 1.75 to 2.5.

3 . The composition of claim 1 , wherein the solids content of the composition is from 16 to 36 wt % based on the total weight of the composition.

4 . The composition of claim 1 , wherein the phenolic compound is resorcinol, resole, an alkoxylated resole, or a mixture thereof.

5 . The composition of claim 1 , wherein the polyisocyanate compound contains at least three isocyanate groups.

6 . The composition of claim 1 , wherein the polyisocyanate compound comprises tris(p-isocyanatophenyl)thiophosphate, silane functionalized tris(p-isocyanatophenyl)thiophosphate, tris(p-isocyanatophenyl)methane, polymeric MDI, or a mixture thereof.

7 . The composition of claim 1 , wherein the composition comprises, based on the total weight of the composition, (a) from 6 to 13 wt % of the phenolic compound, (b) from 4.6 to 20.3 wt % of the polyisocyanate compound, (c) from 65 to 85 wt % of the solvent, (d) from 0.05 to 0.3 wt % of a fluorescing agent, and (e) from 0 to 1 wt % of a surfactant.

8 . The composition of claim 1 , further comprising hydrochinon, catechol, or a mixture thereof.

9 . The composition of claim 1 , wherein isocyanate content of the composition changes less than 10% after 4-month storage at 40° C.

10 . An adhesive system comprising the composition of claim 1 , and an adhesive.

11 . The adhesive system of claim 10 , wherein the adhesive is a one-component or two-component isocyanate functional adhesive, or an adhesive having a functional group selected from acrylic, methacrylic, siloxy, epoxy or a mixture thereof.

12 . A method of bonding a first substrate to a second substrate, comprising:
(i) applying the composition of claim 1 to the surface of at least one of the substrates and allowing the solvent to evaporate, (ii) applying an adhesive to the surface of at least one of the substrates treated by the composition in step (i), (iii) contacting the two substrates with the adhesive residing therebetween, and (iv) curing the adhesive.

13 . The method of claim 12 , wherein the time between the application of the composition and the application of the adhesive is from 1 minute to 3 months.

14 . The method of claim 12 , wherein the adhesive is a one-component or two-component isocyanate functional adhesive.

15 . The method of claim 12 , wherein at least one of the substrates is selected from polyamide, polybutylene terephthalate, polyethylene terephthalate, epoxy- or polyester-based fiber reinforced plastic, an epoxy- or polyester-based sheet molding compound, untreated polycarbonate, poly(meth)acrylate polymer and copolymer, styrene-acrylonitrile copolymer, acrylonitrile-butadiene-styrene copolymer, or mixtures thereof.

Assignees

• Dow Global Technologies Llc

Inventors

• Schmatloch Stefan
• Santoro Gunter G

Classifications

• C09J175/04

  Polyurethanes · CPC title

• C08G18/775

  sulfur · CPC title

• C09J5/02

  involving pretreatment of the surfaces to be joined · CPC title

• C08G18/8019

  Masked aromatic polyisocyanates · CPC title

• C08G18/5045

  containing urethane groups · CPC title