Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1988-06-01
1989-08-29
Kight, John
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528128, 528172, 528173, 528185, 528188, 528208, 528220, 528229, 528353, 430286, 564342, 564343, 564345, 568306, C08G 1600, C08G 7310
Patent
active
048618543
ABSTRACT:
A photosensitive polyimide precursor composed of the structural units (A) represented by the following general formula (I) and the structural units (B) represented by the following general formula (II), in which the ratio of the molar quantity of the structural units (A) to the sum of the molar quantity of the structural units (A) and that of the structural units (B) is 0.01 or greater, and having a viscosity of 100 cP or above as measured at 25.degree. C. in the state of a 10% by weight solution in N-methylpyrrolidone: ##STR1## wherein R.sub.1 represents a tetravalent aromatic hydrocarbon residue; R.sub.2 represents a divalent aromatic hydrocarbon residue; X, identical or different represents a halogen or an alkyl group; and m represents 0 or an integer from 1 to 4. The photosensitivity of the present photosensitive polyimide precursor is about 20 to 100 times that of conventional products. After heat dehydration cyclization, it shows a heat resistance of 400.degree. C. or above.
REFERENCES:
patent: 4670535 (1987-01-01), Sugio et al.
Hochmolekularbericht 1983, III-08.
Chang et al., Taiwan Ko Hsu 1978, 32 (4).
Hayashi Katsushige
Kawaki Takao
Kobayashi Makoto
Sugio Akitoshi
Watanabe Masahito
Kight John
Krass Frederick
Mitsubishi Gas Chemical Company Inc.
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