Back to results
US 6,294,259 B1Granted
Polyimide hybrid adhesives
Assignee3M Innovative Properties Company
InventorsGregory J. Anderson, Scott B. Charles, Michael A. Kropp
Life of this patent
Estimating the term…
Abstract
This invention relates to a polyimide hybrid adhesive comprised of an epoxy component, an epoxy curing agent, and a polyimide oligomer of molecular weight of up to about 8,000 (Mn) having repeating units of Formula (1): The adhesives are particularly useful in applications where thermal stability and high adhesive strength are required.
Claims25
A hybrid adhesive composition comprising:
- a) a polyimide oligomer having a molecular weight (Mn) of less than about 8,000 grams/mole, said oligomer having a repeating unit backbone of Formula (I):
- where terminal end group Z is selected from:
- and where terminal end group Z′ is selected from:
- wherein R1 and R2 are independently selected from hydrogen, halogens, alkyls having about 1-12 carbon atoms, alkoxys having about 1-12 carbon atoms and aminos;
- b) an epoxy resin;
- and
- c) an epoxy curing agent.
4 more elements
A solventless process for preparing a catalytic curable hybrid adhesive composition comprising the steps of:
- providing a polyimide oligomer having a molecular weight (Mn) of less than about 8,000 grams/mole, said oligomer having a repeating unit backbone of Formula (I):
- where terminal end group Z is selected from:
- and where terminal end group Z′ is selected from:
- wherein R1 and R2 are independently selected from hydrogen, halogens, alkyls having about 1-12 carbon atoms, alkoxys having about 1-12 carbon atoms, and aminos;
- providing an epoxy resin and dissolving said oligomer in said epoxy resin at an elevated temperature;
- providing an epoxy curing agent;
- and
- cooling said epoxy resin and oligomer to a temperature below the activation temperature of said catalyst and blending said catalyst into said solution.
5 more elements
Dependencies are inferred from the claim text.