| abstract |
The present invention relates to an aramid paper suitable for use in electronic applications having a density of 0.20 to 0.65 g / cm < 3 > and a basis weight of 30 to 280 g / m < 2 >, said paper having a linear density of less than 2.6 dtex and a linear density of 0.5 to 25 mm Wherein the aramid short cut comprises at least 70 wt.% Para-aramid short cut, and wherein the aramid fibrid comprises 10 to 40 wt.% Of an aramid short cut having a length of at least 70 wt.%, And 10 to 90 wt.% Of an aramid fibrid. Comprises at least 70 wt.% Para-aramid fibrids. It has been found that the use of paper having the above properties in electronic applications ensures a low CTE with good homogeneity and good dimensional stability resulting from good resin adhesion and penetration. The invention also relates to the use of aramid paper in a composite sheet comprising at least one layer of aramid paper and resin, or in a substrate board for electronic applications, for example in a printed circuit board, or in a backing for solar cells . |