Polyurethane-based universal household adhesive

• US 5,270,433 A
• Filed: 10/09/1992
• Issued: 12/14/1993
• Est. Priority Date: 04/09/1990
• Status: Expired due to Fees

• Current Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Original Assignee: Henkel KGaA (Henkel AG & Co KGaA)
• Inventors: Hoefer, Rainer, Maier, Wolfgang, Klauck, Wolfgang, Gruetzmacher, Roland, Gierenz, Gerhard
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US07/934,511
• Time in Patent Office: 431 Days
• Field of Search: 524/158, 524/236, 524/284, 524/591, 524/714, 524/773, 524/839, 524/840
• US Class Current: 524/158
• CPC Class Codes: C07K 14/501 acidic FGF [aFGF]
• CPC Class Codes: C08G 18/0804 Manufacture of polymers containing ionic or ionogenic groups
• CPC Class Codes: C08G 18/0823 containing carboxylate salt groups or groups forming them
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/765 alpha, alpha, alpha', alpha', -tetraalkylxylylene diisocyanate or homologues substituted on the aromatic ring
• CPC Class Codes: C08G 2170/80 Compositions for aqueous adhesives
• CPC Class Codes: C09J 175/08 from polyethers

Abstract

The invention relates to the use of a substantially clear and at least largely solventless, aqueous, one-component polyurethane dispersion based on the reaction products of

a polyol mixture consisting completely or partly of polypropylene glycol,

a mixture of polyfunctional isocyanates consisting completely or partly of α,α,α'"'"',α'"'"'-tetramethyl xylene diisocyanate (TMXDI),

a functional component capable of salt formation in aqueous solution and

optionally a chain-extending agent

as a universal household adhesive and to a process for its production in the absence of inert solvents.

Claims

1. A universal household adhesive composition comprising a substantially clear and solvent-free, aqueous, one-component polyurethane dispersion containing the reaction products of

(a) a polyol mixture comprising polypropylene glycol,

(b) a mixture of polyfunctional isocyanates comprising α

, α

, α

¹, α

¹ -tetramethyl xylene diisocyanate,

(c) a functional component capable of salt formation in aqueous solution, and

(d) optionally, a chain-extending agent.

2. A universal household adhesive composition as in claim 1 wherein said polypropylene glycol has a molecular weight of from about 200 to about 5,000.

3. A universal household adhesive composition as in claim 1 wherein said polyol mixture contains at least about 30% by weight of polypropylene glycol.

4. A universal household adhesive composition as in claim 3 wherein said polyol mixture further contains polytetrahydrofuran, polyethylene glycol, polyacetal, polycarbonate and polyester containing on average 2 to 4 OH groups.

5. A universal household adhesive composition as in claim 1 wherein said mixture of polyfunctional isocyanates contains at least about 20% by weight of said α

, α

, α

¹, α

¹ -tetramethyl xylene diisocyanate.

6. A universal household adhesive composition as in claim 5 wherein said mixture of polyfunctional isocyanates contains an aliphatic isocyanate containing on average 2 to 4 NCO groups.

7. A universal household adhesive composition as in claim 1 wherein said polyol mixture and said mixture of polyfunctional isocyanates are present in a ration of NCO-reactive groups to NCO groups of from about 1:

1 to about 1;

2.5.

8. A universal household adhesive composition as in claim 1 wherein said functional component capable of salt formation in aqueous solution is selected from the group consisting of a carboxylic acid, sulfonic acid, and ammonium compound containing 1 to 2 isocyanate-reactive groups.

9. A universal household adhesive composition as in claim 8 wherein said functional component is in the form of an alkali metal salt, ammonium salt, or salt of a primary, secondary or tertiary amine.

10. A universal household adhesive composition as in claim 8 wherein said carboxylic acid comprises dimethylol propionic acid.

11. A universal household adhesive composition as in claim 1 wherein said functional component capable of salt formation is present in an amount of about 10 to about 90 mol. %, based on said polyol mixture plus any content of chain-extending agent.

12. A universal household adhesive composition as in claim 1 containing a chain-extending agent selected from the group consisting of an isocyanate-reactive diamine and a dihydroxy compound.

13. A universal household adhesive composition as in claim 1 wherein the clarity of said composition is controlled by the quantity present of said functional component capable of salt formation.

14. A universal household adhesive composition as in claim 1 wherein the clarity of said composition is controlled by the quantity of neutralizing agent added for said functional component capable of salt formation.

15. The process of producing a substantially clear and solvent-free, aqueous, one-component polyurethane dispersion comprising reacting

(a) a polyol mixture comprising polypropylene glycol,

(b) a mixture of polyfunctional isocyanates comprising α

, α

, α

¹, α

¹ -tetramethyl xylene diisocyanate,

(c) a functional component capable of salt formation in aqueous solution, and

(d) optionally, a chain-extending agent,

in the absence of an inert solvent, and dispersing the reaction products in the absence of an inert solvent.

16. A process as in claim 15 wherein the reactants are mixed at room temperature, the mixture is stirred at a temperature of about 70°

C. to about 110°

C. until the desired NCO value has been obtained, and the reaction mixture is dispersed in water.

17. A process as in claim 16 wherein said water contains a quantity of base material sufficient to neutralize the polyurethane prepolymers.