Sag resistant, two component urethane adhesives

• US 4,743,672 A
• Filed: 02/26/1987
• Issued: 05/10/1988
• Est. Priority Date: 02/26/1987
• Status: Expired due to Term

• Current Assignee: Ashland Licensing and Intellectual Property Llc
• Original Assignee: Ashland Oil, Inc. (Ashland Global Holdings, Inc.)
• Inventors: Goel, Anil B.
• Primary Examiner(s): Welsh, Maurice J.
• Assistant Examiner(s): ACQUAH, SAMUEL A
• Application Number:
  US07/019,167
• Time in Patent Office: 439 Days
• Field of Search: 528/44, 528/54, 528/55, 528/58, 528/60, 528/61, 528/66, 528/905
• US Class Current: 528/44
• CPC Class Codes: C08G 18/0885 using additives, e.g. absorbing agents
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/3825 containing amide groups C08G18/3821 takes precedence
• CPC Class Codes: C08G 18/50 having heteroatoms other than oxygen
• CPC Class Codes: C09J 175/12 from compounds containing nitrogen and active hydrogen, the nitrogen atom not being part of an isocyanate group
• CPC Class Codes: Y10S 528/905 Polymer prepared from isocyanate reactant has adhesive property

Abstract

A sag resistant two component polyurethane adhesive comprising a first polyisocyanate component and a second component comprising a polyol, a poly(alkylene oxide) polyamine and a polyurethane catalyst is described.

Claims

1. A two component polyurethane adhesive comprising a first component comprising a polyisocyanate prepolymer and a second component comprising a polyol, a poly(alkylene oxide) polyamine containing two or more primary amine groups and having a molecular weight of from about 400 to about 10,000 and a polyurethane catalyst.

2. The adhesive of claim 1 wherein the polyurethane catalyst is selected from the group consisting of salts of tin, bismuth, zinc, lead, mercury, vanadium, cobalt, nickel, iron, potassium and copper and tertiary amines.

3. The adhesive of claim 2 wherein the polyol contains at least two hydroxyl groups and has a molecular weight in the range of from 20 to 5000.

4. The adhesive of claim 3 wherein the isocyanate prepolymer is prepared from methylene bis(phenyl isocyanate) and polyol (propylene oxide) diol.

5. The adhesive of claim 3 wherein the poly (alkylene oxide) polyamine is a mixture of poly(propylene oxide) diprimary amine and poly(propylene oxide) triprimary amine.

6. The adhesive of claim 3 wherein the polyurethane catalyst is triethylene diamine.

7. The adhesive of claim 3 wherein the polyurethane catalyst is dibutyl tin dilaurate.

8. The process comprising adhering a substrate material to another substrate comprising intercalating between the substrates the adhesive of claim 1 and curing the adhesive.

9. The process of claim 8 wherein the substrate material is selected from the group consisting of reinforced and unreinforced thermoplastic, reinforced and unreinforced thermosetting resins, metal and ceramics.