16-04-2020 дата публикации
Номер: US20200115502A1
Принадлежит:
A branched polyimide of the formula (I) wherein G is a group having a valence of t, present in an amount of 0.01 to 10 mol %, or 0.05 to 5 mol %, or 0.1 to 4 mol %, or 0.1 to 3 mol %, each of Q, M, D, V, and R are as defined herein, q is 0 or 1, m is 0 or 1, d is 0 or 1, p is 1 or 2, t is 2 to 6, preferably 2 to 4, and each n is independently the same or different, and is 1 to 1,000, provided that the total of all values of n is greater than 4, wherein the branched polyimide has a zero-shear viscosity in a range from 500 to 15,000 Pa·s, a rheology ratio of 1.1 to 5, and a strain hardening ratio of 1 to 6. 2. The branched polyimide of claim 1 , wherein the branched polyimide has G is present in an amount of 0.3 to 0.5 mole percent, the rheology ratio is 1.1 to 1.5 and the strain hardening ratio is 1.1 to 1.5; or', 'G is present in an amount of 0.5 to 2 mole percent, the rheology ratio is 1.3 to 1.7, and the strain hardening ratio is 1.5 to 2.5; or', 'G is present in an amount of 2 to 3 mole percent, the rheology ratio is 1.6 to 2, and the strain hardening ratio is 2.5 to 3., 'a weight average molecular weight of 30,000 to 40,000 grams per mole, as measured by gel permeation chromatography using a triple point detector, wherein'}3. The branched polyimide of claim 1 , wherein the branched polyimide hasa weight average molecular weight of 40,100 to 52,000 grams per mole, as measured by gel permeation chromatography using a triple point detector, G is present in an amount of 0.3 to 0.5 mole percent, the rheology ratio is 1.5 to 2.5 and the strain hardening ratio is 3 to 4; or', 'G is present in an amount of 0.5 to 2 mole percent, the rheology ratio is 2 to 2.5, and the strain hardening ratio is 4 to 5; or', 'G is present in an amount of 2 to 3 mole percent, the rheology ratio is 2.5 to 3, and the strain hardening ratio is 4.5 to 5., 'wherein'}4. The branched polyimide of claim 1 , wherein the branched polyimide hasa weight average molecular weight of 52,100 to 68,000 ...
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