US 5,310,943 AGranted

Aromatic trisanhydrides

AssigneeCiba-Geigy Corporation

InventorYefim Blyakhman

Life of this patent

Estimating the term…

Abstract

Aromatic trisanhydrides of the formula (I) ##STR1## wherein R is hydrogen, C.sub.1 -C.sub.4 alkyl or aryl are useful for the synthesis of star-branched and star-burst polyester-imides and polyesterimide-amides and as curing agents for epoxy resins, phenolics and polyesters.

Claims5

Dependent claims

An aromatic trisanhydride of formula (I)

wherein R is hydrogen, C.sub.1 -C.sub.4 alkyl or aryl.

Dependencies are inferred from the claim text.

Facts

Application: 08/052,314Filed 23 Apr 1993 · division
Priority: 11 Mar 1991
Granted: 10 May 1994
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

C07C 69/76
Esters of carboxylic acids; Esters of carbonic or haloformic acids: esters of carboxylic acids having a carboxyl group bound to a carbon atom of a…
C08G 59/4223
Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof: aromatic
C08G 63/20
Dicarboxylic acids and dihydroxy compounds: polyesters having been prepared in the presence of compounds having one reactive group or more than…
C08G 73/16
Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors: polyester-imides

Family

Serial667,718Parent of this division · filed 11 Mar 1991
US 5,241,082 AParent of this division
US 5,310,943 AThis patent

From the US filing history. Foreign family members aren’t listed.

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