Patent ID: 9258891
Filing Date: 2016-02-09
CPC Classification: B32B,C08J,H05K,Y10T

Claim Text:
1. A PPE-containing prepreg comprising a base material and a curable resin composition containing polyphenylene ether (PPE) particles, wherein: (1) PPE extracted from the prepreg using a toluene/methanol mixed solvent with a mass ratio of 95:5 includes insoluble PPE particles (A) in the mixed solvent, (2) the content of PPE in the PPE particles (A) is 70 mass % or greater, and (3) the number-average molecular weight of the PPE in the PPE particles (A) is between 8,000 and 40,000, (4) PPE extracted from the prepreg using a toluene/methanol mixed solvent with a mass ratio of 95:5 includes dissolved PPE (B) which is dissolved in the mixed solvent, in addition to the insoluble PPE particles (A) in the mixed solvent, (5) the mass ratio of the PPE particles (A) and the dissolved PPE (B) is 99:1 to 45:55, (6) the content of PPE in the curable resin composition is between 10 mass % and 70mass % based on 100 mass % as the curable resin composition, and (7) the average number of phenolic hydroxyl groups per PPE molecule in the PPE particles (A) is 0.3 to 2.0.