Polyisocyanate-based adhesive

Patent metadata

Field	Value
Publication number	US-9534072-B2
Application number	US-52983008-A
Country	US
Kind code	B2
Filing date	Mar 13, 2008
Priority date	Mar 15, 2007
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

Adhesive prepared by reacting an organic polyisocyanate with a compound containing isocyanate-reactive hydrogen atoms in the presence of a trimerization catalyst. The softblock content of the adhesive is between 20 and 70 wt %.

First claim

The invention claimed is:

1. A polyisocyanate based adhesive obtained by reacting, in the presence of a trimerisation catalyst, (i) a polymeric polyisocyanate or a prepolymeric polyisocyanate having an isocyanate content of 6 to 30 wt. % with (ii) a polyol selected from a polyether polyol, a polyester polyol and a combination thereof; wherein component (i) is the reaction product of an organic polyisocyanate and a compound containing isocyanate-reactive hydrogen atoms selected from a monohydric alcohol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, polyhexamethylene glycol, polyheptamethylene glycol, polydecamethylene glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonane diol, 2-methyl-1,8-octanediol, a polyester polyol, a mercaptan, a carboxylic acid, an amine, urea, an amide and a mixture thereof; wherein the trimerisation catalyst is selected from the group consisting of alkali metal salts of carboxylic acids; wherein the adhesive has a softblock content between 40 and 60 wt %; and wherein component (ii) does not comprise an amine compound and wherein component (i) and component (ii) are miscible with each other.

2. The adhesive according to claim 1 , wherein at least 50% of the softblock content is provided by the compound containing isocyanate-reactive hydrogen atoms present in the adhesive.

3. The adhesive according to claim 1 , wherein the trimerisation catalyst is used in an amount of 0.01 to 1% by weight based on the total formulation.

4. A laminated structure comprising a support structure, a second substrate layer and an adhesive binding the supporting layer to the second substrate layer wherein the adhesive layer comprises an adhesive as defined in claim 1 .

5. A laminated structure according to claim 4 , wherein the supporting structure is a film.

6. A reaction mixture for preparing a polyisocyanate based adhesive, the reaction mixture consisting of a trimerisation catalyst and (i) a polymeric polyisocyanate or a prepolymeric polyisocyanate having an isocyanate content of 6 to 30 wt. % and (ii) a polyol selected from the group consisting of polyester polyols, polyether polyols, and combinations thereof; wherein component (i) is the reaction product of an organic polyisocyanate and a compound containing isocyanate-reactive hydrogen atoms selected from a monohydric alcohol, polypropylene glycol, tetramethylene glycol, polytetramethylene glycol, polyhexamethylene glycol, polyheptamethylene glycol, polydecamethylene glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 1,9-nonane diol, 2-methyl-1,8-octanediol, a polyester polyol, a mercaptan, a carboxylic acid, an amine, urea, an amide and a mixture thereof; wherein the trimerisation catalyst is selected from the group consisting of alkali metal salts of carboxylic acids; wherein the adhesive has a softblock content between 40 and 60 wt %; wherein component (ii) does not comprise an amine compound; and wherein component (i) and component (ii) are miscible with each other and do not separate into two or more phases.

7. The reaction mixture according to claim 6 , wherein at least 50% of the softblock content is provided by the compound containing isocyanate-reactive hydrogen atoms present in the adhesive.

Assignees

• Gurke Thorsten
• Verbeke Wesley
• Huntsman Int Llc

Inventors

• Gurke Thorsten
• Verbeke Wesley

Classifications

• C08G18/225

  of alkali or alkaline earth metals · CPC title

• C08G18/12 Primary

  using two or more compounds having active hydrogen in the first polymerisation step · CPC title

• C08G18/42

  Polycondensates having carboxylic or carbonic ester groups in the main chain · CPC title

• C08G18/48

  Polyethers · CPC title

• C09J175/04

  Polyurethanes · CPC title