# US 8,771,612 B2 · Photoresponsive gas-generating material, micropump and microfluid device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,612 B2 - Document ID: US8771612B2 - Status: Granted - Kind: B2 - Application number: 12/920,884 - Filed: 2009-03-11 - Published: 2011-01-20 - Granted: 2014-07-08 - Earliest claimed: 2008-03-11 - Assignees: Sekisui Chemical Co., Ltd. - Applicants: Masateru Fukuoka; Kazuki Yamamoto; Yoshinori Akagi; Hiroji Fukui - Inventors: Masateru Fukuoka; Kazuki Yamamoto; Yoshinori Akagi; Hiroji Fukui - Web page: https://patentgrep.com/patent/US8771612B2 ## CPC - B01L 3/50273: {characterised by the means or forces applied to move the fluids} - F04B 19/006: {Micropumps (F04B43/043 and F04B43/095 take precedence)} - B01L 2300/0887: Laminated structure - B01L 2400/046: Chemical or electrochemical formation of bubbles - Y10T 137/2082: Utilizing particular fluid - B01L: CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE - F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F) - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention provides a photoresponsive gas-generating material that is to be used in a micropump of a microfluid device having fine channels formed therein, and is capable of effectively generating gases for transporting a microfluid in response to light irradiation and transporting the microfluid at an improved transport efficiency. The present invention also provides a micropump incorporating the photoresponsive gas-generating material. A photoresponsive gas-generating material 13 is to be used in a micropump having fine channels formed in a substrate, and comprises a photo-sensitive acid-generating agent and an acid-sensitive gas-generating agent, and a micropump 10 has the photoresponsive gas-generating material 13 housed therein. ## Claims ### Claim 1 A photoresponsive gas-generating material in a micropump of a microfluid device having a fine channel formed in a substrate, comprising: at least one photo-sensitive base-generating agent (A) selected from the group consisting of cobalt amine complexes, o-nitrobenzyl carbamate, oxime esters, carbamoyloxy imino group-containing compounds capable of generating an amine in response to light irradiation and represented by formula (1): wherein R1 represents an n-valent organic group; R2 and R3 individually represent a hydrogen, an aromatic group, or an aliphatic group, and may be the same as or different from each other; and n is an integer of 1 or more, and salts of carboxylic acids (al) represented by formula (2) and basic compounds (a2); and a base multiplier (B) ### Claim 2 (depends on 1) The photoresponsive gas-generating material according to claim 1, wherein the photoresponsive gas-generating material comprises 50 to 200 parts by weight of the base multiplier with respect to 100 parts by weight of the photo-sensitive base-generating agent. ### Claim 3 (depends on 1, 2) The photoresponsive gas-generating material according to claim 1 or 2, further comprising an amino alkyl compound (C). ### Claim 4 (depends on 1, 2) The photoresponsive gas-generating material according to claim 1 or 2, further comprising a binder resin. ### Claim 5 (depends on 2) The photoresponsive gas-generating material according to claim 2, wherein the photoresponsive gas-generating material comprises 20 to 500 parts by weight of the photo-sensitive base-generating agent (A) and 10 to 1,000 parts by weight of the base multiplier (B) with respect to 100 parts by weight of the binder resin. ### Claim 6 (depends on 1) The photoresponsive gas-generating material according to claim 1, which is in a tablet, fine particle or film form. ### Claim 7 (depends on 1) A photoresponsive gas-generating part, comprising: the photoresponsive gas-generating material according to claim 1; and a supporting member for supporting said photoresponsive gas-generating material. ### Claim 8 (depends on 1) A micropump to be used in a microfluid device having a fine channel formed in a substrate, comprising, in said micropump, at least one selected from the group consisting of the photoresponsive gas-generating material according to claim 1, a photoresponsive gas-generating tablet made of said photoresponsive gas-generating material, a photoresponsive gas-generating fine particulate material made of said photoresponsive gas-generating material, and a photoresponsive gas-generating film made of said photoresponsive gas-generating material. ### Claim 9 (depends on 7) The micropump according to claim 7, wherein a gas-generating chamber defining said micropump is provided in said substrate, an optical window is provided on one of said substrate to face the gas-generating chamber, and said photoresponsive gas-generating material is housed in said gas-generating chamber. ### Claim 10 (depends on 1) A micropump, wherein said micropump comprises the photoresponsive gas-generating material according to claim 1 is in a film form, a gas-generating unit having an opening on a surface of a substrate is provided on said substrate to define the micropump, and said film-form photoresponsive gas-generating material is attached on the surface of said substrate so that said gas-generating unit is sealed with said film-form photoresponsive gas-generating material. ### Claim 11 (depends on 1) A microfluid device, having a fine channel formed in a substrate, wherein said microfluid device comprises: a first plate having at least two of said micropumps built in said substrate; and a second plate laminated on said first plate and having a groove or a through hole to constitute a fine channel, and said micropump has the photoresponsive gas-generating material according to claim 1 as a driving source. ### Claim 12 (depends on 11) The microfluid device according to claim 11, wherein the photoresponsive gas-generating material has a plurality of said fine channels, and further comprises a light shielding layer extending over openings of said fine channels adjacent to each other in a plain view and shielding said gas-generating unit from light.