Prepolymer dianhydrides

Details Prepolymer dianhydrides Prepolymer dianhydrides

1978-08-14

1980-04-01

Raymond, Richard

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07D30789

Patent

active

041961293

ABSTRACT:
A process for preparing dianhydrides that are miscible with hydroxyl prepolymers at moderate temperatures and can cure hydroxyl prepolymers to elastomers at moderate temperatures is disclosed. The dianhydrides are prepared by solution reaction of a prepolymer diol with excess dianhydride followed by removal of unreacted dianhydride. The prepolymer dianhydrides are miscible with hydroxyl substituted hydrocarbon prepolymers and cure the prepolymers to polyester-linked elastomers.

REFERENCES:
patent: 3183248 (1965-05-01), Hirsch et al.
patent: 3225065 (1965-12-01), Hyde
patent: 3239537 (1966-03-01), Steckler et al.
patent: 3264261 (1966-08-01), Stark
patent: 3459584 (1969-08-01), Caldwell
patent: 3919172 (1975-11-01), Rhein et al.

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