	US 12,009,555 B2
	Radical-curable seal member for fuel cell
Shota Taniguchi, Aichi (JP); Yasunori Nimura, Aichi (JP); and Kenji Yamamoto, Aichi (JP)
Assigned to Sumitomo Riko Company Limited, Aichi (JP)
Filed by Sumitomo Riko Company Limited, Aichi (JP)
Filed on Jun. 10, 2021, as Appl. No. 17/344,918.
Application 17/344,918 is a continuation of application No. PCT/JP2020/031290, filed on Aug. 19, 2020.
Claims priority of application No. 2019-155491 (JP), filed on Aug. 28, 2019.
Prior Publication US 2021/0313596 A1, Oct. 7, 2021
Int. Cl. H01M 8/0284 (2016.01); C08F 265/06 (2006.01); C08K 3/36 (2006.01); C08K 9/06 (2006.01); H01M 8/0276 (2016.01); H01M 8/1004 (2016.01)

CPC H01M 8/0284 (2013.01) [C08F 265/06 (2013.01); C08K 3/36 (2013.01); C08K 9/06 (2013.01); H01M 8/0276 (2013.01); H01M 8/1004 (2013.01)]

13 Claims

1. A radical-curable seal member for fuel cell, comprising a crosslinked product of a radical-curable composition and having a glass transition temperature (Tg) of −40° C. or lower, wherein the radical-curable composition comprises:

(A) (Meth)acrylic polymer having a (meth)acryloyl group at a molecular chain end,

(B) Monofunctional (meth)acrylic monomer,

(D) Radical polymerization initiator,

wherein the radical-curable composition contains 20 to 90 weight parts of the component (B), 1 to 10 weight parts of the component (C), and 0.01 to 10 weight parts of the component (D) with respect to 100 weight parts of the component (A), and

a weight ratio [(B)/(C)] of the component (B) with respect to the component (C) is 4 to 24, and a content [(C)/{(A)+(B)+(C)}] of the component (C) with respect to a total of 100 wt % of the component (A), the component (B), and the component (C) is 1 to 7 wt %.