Siman 29
Presented here for study, not as a practical ruling. The Shulchan Aruch rules by Sephardi custom, the Rema's glosses by Ashkenazi custom, and the Kitzur follows Ashkenazi custom. For a practical question, ask your rabbi.
א אֵין לְבָרֵךְ שׁוּם בְּרָכָה כְּשֶׁחוֹלֵץ תְּפִלִּין אֲפִלּוּ כְּשֶׁחוֹלְצָם עֶרֶב שַׁבָּת בֵּין הַשְּׁמָשׁוֹת:
1 One should not make a blessing at all when he removes the tefillin even when he removes them on the eve of the Sabbath at [the time of] "between the suns" (dusk).