Sumitomo Chemical Company, Limited

Industrial Technology Research Institute

Junichi Ikeuchi

Mitsunori Nodono

Katsunori Mochizuki

Yasuhiro Yamashita

Nozomi Masui

Chyi Ming Leu

Takashi Sakurai

Boram Pyeon

Tzong Ming Lee

Chih Cheng Lin

Koji Miyamoto

Hiroko Sugiyama

An object of the present invention is to provide a polyamideimide resin for an optical member having both high flexibility and bending resistance, and in particular, a polyamideimide resin for a front plate of an image display apparatus, and an optical member such as a front plate containing the polyamideimide resin. A polyamideimide resin having constitutional units represented by formula (1) and formula (2): in formula (1) and formula (2), X and Z each independently represent a divalent organic group,Y represents a tetravalent organic group, andat least a part of Z is constitutional unit represented by formula (3): in formula (3), Rto Reach independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms, and the hydrogen atoms contained in Rto Rmay be each independently substituted with a halogen atom,A represents &#x2014;O&#x2014;, &#x2014;S&#x2014;, &#x2014;CO&#x2014; or &#x2014;NR&#x2014;, and Rrepresents a hydrocarbon group having 1 to 12 carbon atoms which may be substituted with a halogen atom,m is an integer of 1 to 4, and* represents a bonding hand.

Polyamideimide resin and optical member including polyamideimide resin

A resin filmcomprising a polyimide-based polymer is disclosed. The resin filmhas a tensile elastic modulus of 4.0 GPa or more. In a bending test where the resin filmis repeatedly folded into a U-shape until the distance between the resin film faces opposed to each other reaches 3 mm, and unfolded, the number of times of folding the resin filmuntil the resin filmfractures is more than 100000.

Resin film, laminate, optical member, gas barrier material and touch sensor substrate

The present invention provides a polymer electrolyte membrane with excellent proton conductivity in its thickness direction. Preferably, the polymer electrolyte membrane containing a polymer compound comprising an ionic segment having an ionic functional group and a nonionic segment having substantially no ionic functional group, and the phase containing ionic segments as a main component and the phase containing nonionic segments as a main component are phase-separated, and in the surface region thereof, the change in the amount of the ionic segment from the surface toward the interior substantially decreases monotonically.

Polymer electrolyte membrane, method for producing the same, and proton conductivity evaluation method for polymer electrolyte membrane

Growing community of inventors

Tsukuba, Japan

Junichi Ikeuchi