Patent ID: 8623800

Claim:
A lubricant, comprising: a first ingredient and a second ingredient, said first ingredient as the main constituent being a first perfluoropolyether compound represented by the formula (1) which has a weight-average molecular weight of 500 to 6000 and a dispersity smaller than 1.3, and said second ingredient being a second perfluoropolyether compound which has a weight-average molecular weight of 500 to 6000 and has 6 to 10 hydroxyl groups (on average) in one molecule, Rt-Rf 1 -Rt (1) where, Rf 1 denotes a perfluoropolyether chain represented by the formula (2) and Rt denotes a terminal group represented by the formula (3), —CF 2 O—[(CF 2 CF 2 O) m —(CF 2 O) n ]—CF 2 — (2) where, m and n each denote a natural number,