Catalytic trimerization of polyisocyanates

• US 4,067,830 A
• Filed: 03/29/1976
• Issued: 01/10/1978
• Est. Priority Date: 03/29/1976
• Status: Expired due to Term

• Current Assignee: Ashland Oil, Inc. (Ashland Global Holdings, Inc.)
• Original Assignee: Ashland Oil, Inc. (Ashland Global Holdings, Inc.)
• Inventors: Kresta, Jiri E.
• Primary Examiner(s): Rzucidlo, Eugene C.
• Application Number:
  US05/671,562
• Time in Patent Office: 652 Days
• Field of Search: 260/2.5 AC, 260/2.5 AW, 260/77.5 AC, 260/75 NC, 260/77.5 NC, 260/2.5 AB, 260/77.5 AB, 260/75 NB
• US Class Current: 521/125
• CPC Class Codes: C08G 18/168 Organic compounds
• CPC Class Codes: C08G 18/1825 having hydroxy or primary amino groups
• CPC Class Codes: C08G 2115/02 to isocyanurate groups
• CPC Class Codes: Y10S 521/902 Cellular polymer containing an isocyanurate structure

Abstract

Compounds (aminimides) of the class wherein a negatively charged nitrogen atom of an acylamide is directly bonded to a cationic nitrogen atom having one hydroxyethyl and two methyl substituents represent uniquely effective catalysts for the trimerization of the isocyanate radical. These aminimides are especially useful as catalysts for the preparation of rigid polyisocyanate-polyisocyanurate foams.

Claims

1. In a process for preparing rigid polyisocyanurate-polyurethane foam by the catalyzed reaction of a polyol with an excess of polyisocyanate;

the improvement of effecting said reaction in the presence of a catalytic amount of an aminimide having the formula;

##STR3##wherein n is the integer 1 or 2;

R is C₂ -C₈ alkylene when n is 2; and

R is C₁ -C₁₈ alkyl, methoxymethylene or phenyl when n is 1.

2. The improvement in accordance with claim 1 wherein said aminimide is bis(dimethylethanolamine) azelaylimide.

3. The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine acetylimide.

4. The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine propionylimide.

5. The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine methoxyacetylimide.

6. The improvement in accordance with claim 1 wherein said aminimide is dimethylethanolamine benzimide.

7. The improvement in accordance with claim 1 wherein said aminimide is employed in conjunction with an alkali metal salt of a mono-carboxylic acid on the basis of 1-100 parts by weight thereof per 100 parts by weight of the aminimide.

8. The improvement in accordance with claim 7 wherein said alkali metal is potassium.

9. The improvement in accordance with claim 8 wherein said monocarboxylic acid is 2-ethylhexanoic acid.