Polyiso-urea

Patent metadata

Field	Value
Publication number	US-9982083-B2
Application number	US-201515120292-A
Country	US
Kind code	B2
Filing date	Feb 19, 2015
Priority date	Feb 20, 2014
Publication date	May 29, 2018
Grant date	May 29, 2018

Abstract

A composition for forming a polyiso-urea includes a capped polycarbodiimide and a polyol. The capped polycarbodiimide comprises the reaction product of a diisocyanate and a monoisocyanate in the presence of an oxygen scavenger and a carbodiimidization catalyst and in the absence of solvent, has 0.25 wt. % or less of free isocyanate groups, and is a liquid at 25° C. A polyiso-urea comprises the reaction product of the capped polycarbodiimide and the polyol.

First claim

What is claimed is:

1. A composition for forming a polyiso-urea, said composition comprising:
a capped polycarbodiimide comprising the reaction product of a diisocyanate and a monoisocyanate reacted in the presence of an oxygen scavenger and a carbodiimidization catalyst which is different than said oxygen scavenger, and in the absence of solvent, wherein said capped polycarbodiimide is a liquid at 25° C. and has 0.25 wt. % or less of free isocyanate; and
a polyether polyol and/or a catalytic polyol, wherein said catalytic polyol is derived from an amine-based initiator.

2. A composition as set forth in claim 1 wherein said diisocyanate is selected from 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, and combinations thereof and said monoisocyanate is an aromatic monoisocyanate.

3. A composition as set forth in claim 1 wherein said capped polycarbodiimide has the following formula:
R 2 —N═C═N—[R 1 —N═C═N] n —R 2

wherein each R 1 is an alkyl, a cycloalkyl, an aromatic, a heterocyclic, or a heteroaryl group, each R 2 is independently an alkyl, a cycloalkyl, an aromatic, a heterocyclic, or a heteroaryl group, and n is an integer from 1 to 100.

4. A composition as set forth in claim 3 wherein R 2 is a C 1 -C 12 alkyl, a C 1 -C 12 cycloalkyl, a C 6 -C 12 aromatic, a C 6 -C 12 heterocyclic, or a C 6 -C 12 heteroaryl.

5. A composition as set forth in claim 3 wherein R′ is a C 1 -C 12 alkyl, a C 1 -C 12 cycloalkyl, a C 6 -C 12 aromatic, a C 6 -C 12 heterocyclic, or a C 6 -C 12 heteroaryl group.

6. A composition as set forth in claim 1 wherein said polyol has a nominal functionality of from about 2 to about 8 and/or a number average molecular weight of equal to or less than about 1,500 g/mol.

7. A composition as set forth in claim 1 consisting essentially of said capped polycarbodiimide and said polyol.

8. A composition as set forth in claim 1 having a pot life of greater than 0.5 years.

9. A composition as set forth in claim 1 which is substantially free of any catalysts other than carbodiimidization catalysts.

10. A method of producing a polyiso-urea with the composition set forth in claim 1 , said method comprising the steps of:
providing the capped polycarbodiimide;
providing the polyol;
combining the capped polycarbodiimide and the polyol component to form the composition set forth in claim 1 ; and
reacting the capped polycarbodiimide and the polyol to form the polyiso-urea.

11. A method as set forth in claim 10 wherein the step of reacting the capped polycarbodiimide and the polyol to form the polyiso-urea is further defined as heating the composition to a temperature of about 60 to about 250° C. and/or is conducted in less than about 60 minutes.

12. A method as set forth in claim 10 wherein the step of reacting the capped polycarbodiimide and the polyol to form the polyiso-urea is conducted in the absence of a catalyst other than a carbodiimidization catalyst.

Assignees

• Basf Se

Inventors

• Kumar Rajesh
• Lebedinski Nikolay

Classifications

• C08G18/80

  Masked polyisocyanates · CPC title

• C08G18/672

  Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen · CPC title

• C08G18/673

  containing two or more acrylate or alkylacrylate ester groups · CPC title

• C08G18/16

  Catalysts (catalysts in general B01J) · CPC title

• C08G18/7621

  being toluene diisocyanate including isomer mixtures · CPC title