Process for producing a low thermally expansive and highly adhes

Details Process for producing a low thermally expansive and highly adhes Process for producing a low thermally expansive and highly adhes

1988-06-01

1990-09-25

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 28, 528 38, 528182, 528188, 528224, 528229, 528351, 528353, 427154, 427155, 427387, 4273899, 4273935, 428446, 4284735, 428480, C08G 7726, C08G 7310, B05D 302, B32B 2728

Patent

active

049594370

ABSTRACT:
A process for producing a silicon-containing polyamic acid affording a silicon-containing polyimide having a low thermal expansion coefficient and a process for producing the silicon-containing polyimide are provided, the former process comprising reacting pyromellitic acid dianhydride (A.sup.1 mols) and 3,3',4,4'-biphenyltetracarboxylic acid dianhydride (A.sup.2 mols) with a diamine of the following formula (I) (B mols) and an aminosilicon compound of the formula (II) so as to satisfy the following expressions (III) and (IV): ##STR1## wherein R.sup.1 is methyl, ethyl, methoxy, ethoxy or halogen; R.sup.2 is alkyl or alkyl-substituted phenyl; X is a hydrolyzable alkoxy, acetoxy or halogen; m is 0, 1 or 2; n is 1 or 2; and k is 1, 2 or 3; and

REFERENCES:
patent: 3926911 (1975-12-01), Greber et al.
patent: 3948835 (1976-04-01), Greber et al.
patent: 3950308 (1976-04-01), Greber et al.
patent: 4499252 (1985-02-01), Igarashi et al.
patent: 4591653 (1986-05-01), Kunimune et al.
patent: 4672099 (1987-06-01), Kunimune et al.
patent: 4748228 (1988-05-01), Shoji et al.

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