MICROPRODUCT, MEDICAL MICROPRODUCT, MMICROWELL ARRAY CHIP, MICROWELL POSITION DETECTION PLATE, AND MICRO RESIN PIPETTE TIP USING THE MICROPRODUCT

• US 20100123273A1
• Filed: 01/27/2010
• Published: 05/20/2010
• Est. Priority Date: 12/19/2003
• Status: Active Grant

• Current Assignee: Nagaoka University of Technology, Richell, TOYAMA PREFECTURE
• Original Assignee: Nagaoka University of Technology, Richell, TOYAMA PREFECTURE
• Inventors: SUZUKI, Masayasu, FUJIKI, Satoshi, ONAGA, Takashi, MORIMOTO, Hideki, OBATA, Tutomu, YAMASHITA, Kazuyuki
• Granted Patent: US 8,609,009 B2
• Time in Patent Office: Days
• US Class Current: 264/328.100
• CPC Class Codes: B29C 2045/0094 injection moulding of small-sized articles, e.g. microarticles, ultra thin articles
• CPC Class Codes: B29C 45/0001 characterised by the choice of material
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/12 Polypropene
• CPC Class Codes: C08L 23/14 Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C08L 2666/06 Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 53/025 modified

Abstract

A method of producing a microproduct comprises: providing a resin composition including 30 to 90 wt % of a polypropylene-based resin and 10 to 70 wt % of a hydrogenated derivative of a block copolymer shown by “X-Y” (X represents a polymer block immiscible with the polypropylene-based resin, Y represents an elastomeric polymer block of a conjugated diene that'"'"'s miscible with the polypropylene-based resin after hydrogenation); attaching a silicon stamper to a mold cavity of an injection molding machine, the silicon stamper having micromachined features formed by etching the surface of a silicon plate; and precisely transferring the micromachined features of the silicon stamper to the resin composition by injecting the resin composition into the mold cavity, a resulting molded surface having recesses and/or protrusions that are 0.3 to 200 μm deep or tall and 0.3 to 100 μm wide.

Claims

1. A method of producing a microproduct comprising:

providing a resin composition including 30 to 90 wt % of a polypropylene-based resin and 10 to 70 wt % of a hydrogenated derivative of a block copolymer shown by the general formula “

X-Y”

(X represents a polymer block immiscible with the polypropylene-based resin, and Y represents an elastomeric polymer block of a conjugated diene that is miscible with the polypropylene-based resin after hydrogenation);

attaching a silicon stamper to a mold cavity of an injection molding machine, the silicon stamper having micromachined features formed by etching the surface of a silicon plate; and

precisely transferring the micromachined features of the silicon stamper to the resin composition by injecting the resin composition into the mold cavity,

a molded surface formed using the resin composition having a plurality of recesses and/or protrusions, a depth of each recess or a height of each protrusion being 0.3 to 200 μ

m, and a width of an opening of each recess, a width of each protrusion, or a circumscribed or inscribed circle diameter of each recess or each protrusion being 0.3 to 100 μ

m.

2. The method as defined in claim 1,

wherein the polymer block X of the hydrogenated derivative of the resin composition is polystyrene, and the polymer block Y before hydrogenation is polyisoprene having a 1,2-bond, a 3,4-bond, and a 1,4-bond, or polyisoprene having a 1,4-bond.

3. The method of producing the microproduct as defined in claim 1,

wherein the polymer block X of the hydrogenated derivative of the resin composition is polystyrene, and the polymer block Y before hydrogenation is polybutadiene having at least one of a 1,2-bond and a 1,4-bond.

4. The method of producing the microproduct as defined in claim 1,

wherein the resin composition includes a nucleating agent for the polypropylene-based resin.