Carbodiimides

• US 4,085,140 A
• Filed: 08/23/1977
• Issued: 04/18/1978
• Est. Priority Date: 09/22/1976
• Status: Expired due to Term

• Current Assignee: Imperial Chemical Industries Limited (Nouryon BV)
• Original Assignee: Imperial Chemical Industries Limited (Nouryon BV)
• Inventors: Ibbotson, Arthur
• Primary Examiner(s): Schwartz, Gerald A.
• Application Number:
  US05/827,097
• Time in Patent Office: 238 Days
• Field of Search: 260/566 R, 260/551 CD
• US Class Current: 564/252
• CPC Class Codes: C07C 267/00 Carbodiimides
• CPC Class Codes: C08G 18/022 the polymeric products containing isocyanurate groups
• CPC Class Codes: C08G 18/025 the polymeric products containing carbodiimide groups
• CPC Class Codes: C08G 18/092 oligomerisation to isocyanurate groups
• CPC Class Codes: C08G 18/2825 having at least 6 carbon atoms
• CPC Class Codes: C08G 18/3206 aliphatic
• CPC Class Codes: C08G 18/4241 from dicarboxylic acids and dialcohols in combination with polycarboxylic acids and/or polyhydroxy compounds which are at least trifunctional
• CPC Class Codes: C08G 18/4812 Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
• CPC Class Codes: C08G 18/4825 Polyethers containing two hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/4829 Polyethers containing at least three hydroxy groups C08G18/4833 - C08G18/5096 take precedence
• CPC Class Codes: C08G 18/485 containing mixed oxyethylene-oxypropylene or oxyethylene-higher oxyalkylene end groups
• CPC Class Codes: C08G 18/5021 having nitrogen
• CPC Class Codes: C08G 18/6674 with compounds of group C08G18/3203
• CPC Class Codes: C08G 18/7664 containing alkylene polyphenyl groups
• CPC Class Codes: C08G 18/7671 containing only one alkylene bisphenyl group
• CPC Class Codes: C08G 18/797 containing carbodiimide and/or uretone-imine groups
• CPC Class Codes: C08G 2101/00 Manufacture of cellular products

Abstract

A process for the conversion of isocyanate groups to carbodiimide groups which comprises contacting the compound containing the isocyanate groups with a cyclic phosphorus compound which catalyses said conversion in the presence of a nitrogeneous base and the use of the products thereof in the manufacture of isocyanate-based polymers.

Claims

1. In a process for the conversion of isocyanate groups to carbodiimide groups which comprises contacting a compound containing isocyanate groups with a cyclic phosphorus compound which catalyses said conversion the improvement which comprises carrying out said conversion in the presence of a nitrogeneous base selected from 1,4-diazobicyclo-[2,2,2]-octane, N,N-dimethylcyclohexylamine, triethylamine, pyrrolizidine and tetramethylguanidine.

2. A process as set forth in claim 1 in which said nitrogeneous base is 1,4-diazobicyclo-[2,2,2]-octane.

3. A process as set forth in claim 1 in which said nitrogeneous base is N,N-dimethylcyclohexylamine.

4. A process as set forth in claim 1 in which said nitrogeneous base is triethylamine.

5. A process as set forth in claim 1 in which said nitrogeneous base is pyrrolizidine.

6. A process as set forth in claim 1 in which said nitrogeneous base is tetramethylguanidine.