Thermosetting composition

• US 5,210,169 A
• Filed: 02/19/1992
• Issued: 05/11/1993
• Est. Priority Date: 02/21/1991
• Status: Expired due to Fees

• Current Assignee: Ciba-Geigy Corporation (Novartis Ag)
• Original Assignee: Ciba-Geigy Corporation (Novartis Ag)
• Inventors: Muhlebach, Andreas, Gruber, Erich
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US07/838,128
• Time in Patent Office: 447 Days
• Field of Search: 528/45
• US Class Current: 528/45
• CPC Class Codes: C08G 18/3225 Polyamines
• CPC Class Codes: C08G 18/808 Monoamines
• CPC Class Codes: C09J 175/02 Polyureas

Abstract

The invention relates to a thermosetting composition which comprises at least one blocked polyisocyanate of formula I or II ##STR1## wherein n is an integer ≧2,

Q is an organic radical of valency n, and

R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈ are each independently of one another hydrogen, alkyl, aryl, arylalkyl, alkoxy, alkylthio or hydroxyl, and

a primary or secondary polyamine which is liquid at room temperature and is suitable for crosslinking,

which blocked polyisocyanate is essentially insoluble in the polyamine at ambient temperature or moderately elevated temperature.

The novel compositions invention have a particularly high reactivity and good shelf stability. An important embodiment of the invention relates to those compositions in which the blocked isocyanate is essentially insoluble in the polyamine at the storage temperature. The novel compositions are especially suitable for bonding plastics materials and metals.

Claims

1. A thermosetting composition which comprises at least one blocked polyisocyanate of formula I or II ##STR8## wherein n is an integer ≧

2,

Q is an organic radical of valency n, and

R₁, R₂, R₃, R₄, R₅, R₆, R₇, R₈ are each independently of one another hydrogen, alkyl, aryl, arylalkyl, alkoxy, alkylthio or hydroxyl, and

a primary or secondary polyamine which is liquid at room temperature and is suitable for crosslinking,

which blocked polyisocyanate is essentially insoluble in the polyamine at ambient temperature or moderately elevated temperature.

2. A composition according to claim 1, wherein the polyamine is a polyoxyalkylenepolyamine.

3. A composition according to claim 1, wherein the blocked isocyanate is essentially insoluble in the polyamine at a temperature up to 50°

C.

4. A composition according to claim 1, which additionally comprises an agent which lowers the solubility of the blocked isocyanate.

5. A composition according to claim 4, which comprises an agent which enhances the polarity of the medium which surrounds the blocked isocyanate.

6. A composition according to claim 5, wherein the agent is a hydroxyl group containing compound.

7. A composition according to claim 6, wherein the hydroxyl group containing compound is glycerol.

8. A composition according to claim 1, which contains a blocked polyisocyanate in which Q in formula I or II is selected from the organic radicals of formulae III to VII:

##STR9## where the R₉ substituents in formula III are each independently of one another hydrogen or alkyl of 1 to 4 carbon atoms.