Polymerizing bis-maleimides

Patent

Description

Processes for preparing polyimides from bis-maleimides are provided. In these processes, a bis-maleimide is polymerized in the presence of a catalytic amount (usually about 0.01 to 5% by weight of the bis-maleimide) of an alkali metal salt of a Bronsted acid. Preferably, the polymerization is also conducted in the presence of a small amount (usually 0.01 to 5% by weight of the bis-maleimide) of an activator for the catalyst. The activator is an aprotic organic compound having a dielectric constant between about 35 and 45. Melt polymerization is preferred at a preferred temperature of 150.degree. to 275.degree.C.

Attributes

Attribute NameValues
Title
  • Polymerizing bis-maleimides

Patent Number
  • US 3890272 B2

USPTO Link
Inventor
  • Gaetano Francis D'Alelio

Inventor From Local Institution
  • Gaetano Frank D'Alelio

Other Application
  • 05/363,799

Claims
  • 21

Classification (US Patent)
  • 526/204; 526/212; 526/213; 526/214; 526/216; 526/220; 526/222; 526/236; 526/248; 526/262; 528/170; 528/188; 528/229; 528/321; 528/351; 528/352; 528/353;

Cooperative Patent Classification codes
  • C08G 73/12 (20130101); C08G 73/127 (20130101); C08G 73/126 (20130101); C08G 73/125 (20130101)

International Patent Classification codes
  • C08G 73/00 (20060101); C08G 73/12 (20060101); C08g 020/32 ()

Language
  • eng

Date Issued
  • 1975-06-17

Publisher
  • United States Patent and Trademark Office

Assignee
  • University of Notre Dame Du Lac

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