초록 ▼

Polyimide oligomers include (1) linear, monofunctional crosslinking oligomers prepared by condensing a monoanhydride end cap with a diamine that includes alternating ether and “sulfone”(－SO2－, －S－, －CO－, －(CF3)2C－, or －(CH3)2C－) linkages connecting alternating aromatic radicals and with a dianhydrid

Polyimide oligomers include (1) linear, monofunctional crosslinking oligomers prepared by condensing a monoanhydride end cap with a diamine that includes alternating ether and “sulfone”(－SO2－, －S－, －CO－, －(CF3)2C－, or －(CH3)2C－) linkages connecting alternating aromatic radicals and with a dianhydride (or dianhydride mixture), particularly the unsaturated, aliphatic dianhydride commonly known as MCTC; (2) linear, mono- or difunctional crosslinking oligomers prepared by condensing an amine end cap with a diamine and a dianhydride; and (3) multidimensional, crosslinking oligomers having an aromatic hub and at least three radiating arms connected to the hub, each arm including a crosslinking end cap at its distal end and at least one imide linkage. Blends, prepregs, and composites can be prepared from the oligomers. Multidimensional oligomers can be prepared using etheranhydride intermediates or etheramine intermediates formed by reacting a suitable hub with nitrophthalic anhydride or aminophenol.

대표청구항 ▼

A monofunctional crosslinkable, thermoplastic, polyimide oligomer which is the product formed by reacting under an inert gas atmosphere a mixture comprising: (a) two moles of a crosslinkable monoanhydride selected from the group consisting of: [Figure] [Figure] [Figure] wherein Me=methyl; G=－O－, －SO

A monofunctional crosslinkable, thermoplastic, polyimide oligomer which is the product formed by reacting under an inert gas atmosphere a mixture comprising: (a) two moles of a crosslinkable monoanhydride selected from the group consisting of: [Figure] [Figure] [Figure] wherein Me=methyl; G=－O－, －SO2－, －CH2－, or －S－; E=allyl or methallyl; R1=lower alkoxy, aryl, substituted aryl, lower alkyl, substituted alkyl, aryloxy, or halogen; and j=0, 1, or 2; (b) n+1 moles of a polyaryl diamine having terminal amino groups, the diamine including alternating aryl radicals (－Ar－) connected together by alternating ether (－O－) and sulfone (－L－) linkages, wherein each sulfone linkage (－L－) is selected from the group consisting of －SO2－, －S－, －CO－, －(CF3)2C－, and －(CH3)2C－, so that the dimaine has a general formula: H2N－Ar－O－Ar－L－Ar－O]mAr－NH2 wherein Ar=an aromatic radial, and m=a small integer greater than or equal to 1; and (c) n moles of at least one dianhydride, wherein n=an integer selected so that the oligomer prossesses thermoplastic properties and has an average formula weight of between about 5,000 to 40,000.