This invention provides compositions containing thermally stable prepolymers with azadiene end groups, and compositions containing such prepolymers in combination with dienophiles and the chain-extended and cross-linked polymers obtained from these systems. The combination of such prepolymers with d
This invention provides compositions containing thermally stable prepolymers with azadiene end groups, and compositions containing such prepolymers in combination with dienophiles and the chain-extended and cross-linked polymers obtained from these systems. The combination of such prepolymers with dienophiles facilitates processing of the prepolymer resin by lowering the softening and curing temperatures under processing conditions.
대표청구항▼
A composition of matter consisting essentially of a. a prepolymer selected from 1. a polyamide-acid of the formula OO------(NH2)2a ����5--N-CC-N-R5-----II ││ HH �6�1R2R3 ││ ││ HOCCOH--N=C-C=C�����4a, n its corresponding polyimide, 2. a polyamide-amide acid of the formula O ��5------ H--(NH2)2a O �5-
A composition of matter consisting essentially of a. a prepolymer selected from 1. a polyamide-acid of the formula OO------(NH2)2a ����5--N-CC-N-R5-----II ││ HH �6�1R2R3 ││ ││ HOCCOH--N=C-C=C�����4a, n its corresponding polyimide, 2. a polyamide-amide acid of the formula O ��5------ H--(NH2)2a O �5--N-CCOH │��1R2R3 ││ --N=C-C=C�4a, its corresponding polyamide-imide, 3. a polyamide-amide acid of the formula OO ����5-N-CC-N-R5-- ││ HH - OO ����7-N-CCOH ����2)2aV R1R2R3 ││ -N=C-C=C�4a, and its corresponding polyamide-imide, wherein n is a number from 1 to 20, a is a number from 0.1 to 2, R1, R2, R3 and R4 are independently hydrogen or a monovalent aliphatic, cycloaliphatic, Or aromatic radical and R5 and R7 are independently a divalent organic radical containing from 2 to 30 carbon atoms and selected from aromatic, aliphatic, alkylaromatic, and cycloaliphatic radicals, and radicals with hetero-atom containing bridging groups where the heteroatom in the bridge is selected from oxygen, sulfur, nitrogen, phosphorus and silicon, and R6 is a tetravalent aliphatic, cycloaliphatic, aromatic or heterocyclic radical containing at least 2 carbon atoms, or a combination of aromatic and aliphatic radicals, and b. from about 1 to 10 mole equivalents per mole equivalent of (a) of a bis-dienophile selected from 1. a compound of the formula OO ����5-N����2. a polyamide-acid of the formula O ����5--N-CC-N-R5--N │││ HHH D��6������3. a polyamide-amide acid of the formula OO ��5--N-C ││ HH OO ����5-N-CC-OH������4. a polyamide-amide acid of the formula OOO ���5-N-CC-N-R5-- │││ HHH D���7-N-CCOH ������5, R6 and R7 are as defined above, m is a number from 1 to 20, and D is a divalent radical containing olefinic unsaturation having the formula -C-R16 CH2 �����17; H2C-; or wherein R16 is hydrogen, methyl, bromo or chloro; R17 is hydrogen, bromo or chloro; Y1-Y6 inclusive is selected from hydrogen, bromine, chlorine, nitro, phenyl, alkyl of from 1 to 6 carbon atoms; and X is carbonyl, oxygen, sulfur, chloro or bromo substituted methylene, alkylidene of from 1 to 6 carbon atoms, and benzylidene.
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