Process for the preparation of carbodiimide-isocyanurate foams

• US 3,981,829 A
• Filed: 12/30/1974
• Issued: 09/21/1976
• Est. Priority Date: 12/30/1974
• Status: Expired due to Term

• Current Assignee: BASF Corporation (BASF SE)
• Original Assignee: BASF Wyandotte Corporation
• Inventors: Kan, Peter T., Cenker, Moses, Narayan, Thirumurti L.
• Primary Examiner(s): Cockeram, H. S.
• Application Number:
  US05/537,102
• Time in Patent Office: 631 Days
• Field of Search: 260/2.5 BF, 260/2.5 AW, 260/2.5 AC
• US Class Current: 521/107
• CPC Class Codes: C08G 18/025 the polymeric products containing carbodiimide groups
• CPC Class Codes: C08G 18/161 containing two or more components to be covered by at least two of the groups C08G18/166, C08G18/18 or C08G18/22
• CPC Class Codes: C08G 18/2036 having at least three nitrogen atoms in the ring
• CPC Class Codes: C08G 2101/00 Manufacture of cellular products
• CPC Class Codes: C08G 2110/005 < 50kg/m3
• CPC Class Codes: C08G 2115/02 to isocyanurate groups
• CPC Class Codes: C08G 2115/06 to carbodiimide or uretone-imine groups
• CPC Class Codes: Y10S 521/901 Cellular polymer containing a carbodiimide structure
• CPC Class Codes: Y10S 521/902 Cellular polymer containing an isocyanurate structure

Abstract

Rigid cellular foam compositions characterized by carbodiimide and isocyanurate linkages are prepared by catalytically condensing an organic polyisocyanate in the presence of a catalytically sufficient amount of a catalyst system comprising (a) an alkanolaminotriazine, (b) a hexahydrotriazine, and (c) phenol or a substituted phenol.

Claims

1. A process for the preparation of a foam characterized by carbodiimide and isocyanurate linkages which comprises condensing an organic polyisocyanate in the presence of a catalyst system comprising based on 100 parts by weight of organic polyisocyanate

a. from 0.1 part to 10 parts by weight of an s-triazine compound selected from the group consisting of 2,4,6-tris(diethanolamino)-s-triazine, 2,4,6-tris(diisopropanolamino)-s-triazine, 2,4,6-tris(dibutanolamino)-s-triazine, 2,4,6-tris(N-methylethanolamino)-s-triazine, and unsymmetrically substituted triazines of the formula:

##SPC2##

wherein R is hydrogen or lower alkyl of from 1 to 10 carbon atoms, R¹ is CR₂ CR₂ OH or lower alkyl of from 1 to 12 carbon atoms, X is NR₂, alkoxy of from 1 to 12 carbon atoms, phenoxy, alkyl of from 1 to 12 carbon atoms, phenyl, hydroxyl, halogen, aziridyl, pyrrolidyl, piperidyl, or N-alkylpiperazyl,

b. from 1 part to 6 parts by weight of a 1,3,5-tris(N,N-dialkylaminoalkyl)-s-hexahydrotriazine or the alkylene oxide and water adducts thereof, and

c. from 0.01 part to 5 parts by weight of a phenolic compound selected from the group consisting of phenol, methylphenols and halophenols.

2. The process of claim 1 wherein the organic polyisocyanate is selected from the group consisting of toluene diisocyanate, methylene diphenyl diisocyanate, polyphenyl polymethylene polyisocyanate and mixtures thereof.

3. The process of claim 1 wherein (c) is phenol.

4. The process of claim 1 wherein the s-triazine compound is 2,4,6-tris(N-methylethanolamino)-s-triazine.

5. The process of claim 1 wherein the s-triazine compound is 2,4-bis(diethylamino)-6-(N-methyl-2-hydroxyethylamino)-s-triazine.

6. The process of claim 1 wherein the hexahydrotriazine is 1,3,5-tris(N,N-dimethylaminopropyl)-s-hexahydrotriazine.

7. The process of claim 1 conducted in the presence of a fluorocarbon blowing agent.

8. The process of claim 1 conducted in the presence of tris(2-chloroethyl) phosphate.

9. The process of claim 1 conducted in the presence of a polyol.