Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From phenol – phenol ether – or inorganic phenolate
Patent
1978-05-15
1979-12-25
Lee, Lester L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From phenol, phenol ether, or inorganic phenolate
528208, C08G 7310
Patent
active
041806484
ABSTRACT:
Novel aromatic crystalline polimides are disclosed that are synthesized from polyamide-acid and when heated to 200.degree. to 300.degree. C. become cyclized to afford an opaque polymer which by X-ray diffraction of the unoriented film exhibited 47 percent crystallinity. Differential Scanning Calorimetry (DSC) indicates a melt at 425.degree. C. with no glass transition in these crystalline polyimides.
REFERENCES:
patent: 3833546 (1974-09-01), Takekoshi et al.
patent: 3847867 (1974-11-01), Heath et al.
patent: 3850885 (1974-11-01), Takekoshi et al.
patent: 3983093 (1976-09-01), Williams et al.
patent: 3989670 (1976-11-01), Takekoshi et al.
patent: 3991004 (1976-11-01), Takekoshi et al.
St. Clair Anne K.
St. Clair Terry L.
Lee Lester L.
Manning John R.
Nelson Wallace J.
Osborn Howard J.
The United States of America as represented by the Administrator
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