Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1992-07-22
1994-06-28
Kight,, III:
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528 26, 528 33, 528 45, 528125, 528128, 528170, 528171, 528172, 528173, 528174, 528176, 528183, 528188, 528190, 528220, 528229, 528350, 528352, C08G 7310, C08G 6926
Patent
active
053248139
ABSTRACT:
Low dielectric constant polyimides formed from an optionally fluorinated dianhydride and a fluorinated diamine are described. The fluorine containing constituents are sterically disposed so that the dipole moment of the constituents tend to cancel out. Since fluorine containing diamines are generally nonreactive, to achieve a polyimide of high enough molecular weight to be practically useful, a method of fabrication of a high molecular weight polymer from monomers of low reactivity is provided. The monomers, such as a diamine and dianhydride are provided in a solution within which a low molecular weight polyamic acid is formed. The solution is dried. The polyamic acid used is cured to a low molecular weight polyimide. The polyimide is redisolved, redryed and recured enough times to build up the molecular weight to a useful level. The method is applicable to fabricating other polymers of high molecular weight, such as polyamides, polyesters and polyurethanes.
REFERENCES:
patent: 3542735 (1970-11-01), Lynch
patent: 3793291 (1974-02-01), Cohen
patent: 4045407 (1977-08-01), Keske et al.
patent: 4495342 (1985-01-01), Landis
patent: 4689391 (1987-08-01), Peters et al.
patent: 4892896 (1990-01-01), Wright
patent: 4910308 (1990-03-01), Teshirogi
patent: 4935490 (1990-06-01), Hayes
patent: 5013840 (1991-05-01), Teshirogi
patent: 5021540 (1991-06-01), Leone-Bay et al.
patent: 5026822 (1991-06-01), Vora
patent: 5049649 (1991-09-01), Rohitkumar
patent: 5071997 (1991-12-01), Harris
patent: 5089593 (1992-02-01), Fjare
patent: 5112941 (1992-05-01), Kasai
Hougham Gareth G.
Shaw Jane M.
Viehbeck Alfred
Hampton Hightower P.
International Business Machines - Corporation
Kight, III:
Morris Daniel P.
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