High speed cure sealant

• US 4,758,648 A
• Filed: 10/20/1986
• Issued: 07/19/1988
• Est. Priority Date: 10/20/1986
• Status: Expired due to Term

• Current Assignee: Allied Products Corporation, Diamond Technology Partnership Company
• Original Assignee: Essex Specialty Products Incorporated
• Inventors: Hsieh, Harry W. S., Prendergast, John J. Sr., Rizk, Sidky D.
• Primary Examiner(s): Kight, John
• Assistant Examiner(s): Acquah, Samuel A.
• Application Number:
  US06/920,747
• Time in Patent Office: 638 Days
• Field of Search: 528/53, 528/76, 528/77
• US Class Current: 528/53
• 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 18/2081 containing at least two non-condensed heterocyclic rings
• CPC Class Codes: C08G 18/307 Atmospheric humidity
• CPC Class Codes: C09K 2003/1056 Moisture-curable materials
• CPC Class Codes: C09K 3/1021 Polyurethanes or derivatives thereof

Abstract

A moisture curable sealant having good stability in the absence of moisture and a rapid cure rate in the sole presence of atmospheric moisture, said sealant comprising a polyurethane prepolymer having an isocyanate functionality between 2.3 and 3.0, and, admixed therewith as a catalyst, from 0.2 to 1.75 percent, by weight of said sealant, of dimorpholinodiethyl ether.

Claims

1. A moisture curable sealant having good stability in the absence of moisture and a rapid cure rate in the sole presence of atmospheric moisture, said sealant comprising a polyurethane prepolymer having an isocyanate functionality between 2.5 and 2.7 and, admixed therewith as a catalyst, from 0.2 to 1.75 percent, by weight of said sealant, of dimorpholinodiethyl ether.

2. A sealant as in claim 1 wherein said catalyst is present in an amount of 0.4 to 1.3 percent by weight of said sealant.

3. A sealant as in claim 1 wherein said polyurethane prepolymer is the reaction product of an isocyanate having at least two isocyanate groups and a polyol.

4. A sealant as in claim 3 wherein said polyol is a polyether polyol.

5. A sealant as in claim 4 wherein said polyether polyol is a mixture of a polyether diol and a polyether triol.

7. A sealant as in claim 3 wherein said polyol is a mixture of a polyether polyol and a polyester polyol.

8. A sealant as in claim 1 which additionally comprises at least one filler and at least one plasticizer in amounts to obtain desired viscosity properties.

6. A sealant as in clai wherein said polyether diol is a polyoxyalkylene diol and said polyether triol is a polyoxyalkylene triol.