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US 3,945,959 AGranted
Oil modified imidized polyester resins
AssigneeThe P. D. George Company
InventorDaniel J. Lange
Life of this patent
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Abstract
This invention relates to oil modified imidized polyester resins containing isocyanurates of the formula ##EQU1## where A is alkylene and preferably ethylene (THIC); and to electrical insulating compositions derived therefrom, particularly those electrical varnishes containing oil soluble resins, such as phenol-aldehyde resins, which possess improved thermal stability.
Claims40
An oil-modified imidized polyester resin of polyester of
- I. an isocyanate of the formula ##EQU6## II. a phthalic acid, III. a member selected from the group consisting of (1) fatty acids, (2) fatty oils, (3) mono- and di-glycerides of the fatty acis and (4) mixtures thereof, and
- Iv. an aromatic tricarboxylic acid and a diamine capable of reacting with each other to form an imide,
- the isocyanurate being the sole polyol component present in the polyester apart from that occurring in the component (III), there being no other polymer forming components in the said resin other than those selected from the above named components.
Dependencies are inferred from the claim text.