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MarketScreener Homepage  >  Equities  >  Tokyo  >  DIC Corporation    4631   JP3493400000

DIC CORPORATION

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“Method For Producing Semi-Ipn Composite” in Patent Application Approval Process (USPTO 20190225801): DIC Corporation

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08/14/2019 | 05:11pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Japan Daily Report -- A patent application by the inventors KOMATSUZAKI, Kunihiko (Osaka, Japan); TSENG, Yayi (Osaka, Japan), filed on August 3, 2017, was made available online on July 25, 2019, according to news reporting originating from Washington, D.C., by NewsRx correspondents.

This patent application is assigned to DIC Corporation (Tokyo, Japan).

The following quote was obtained by the news editors from the background information supplied by the inventors: “Polyurethane has excellent mechanical strength and elastic properties, and therefore has been widely used in various fields of coating agent, molding material, coating composition, optical film, and the like, and studies on the use of polyurethane as a material for moisture-permeable, waterproof cloth and synthetic leather are being extensively made.

“When the polyurethane is used in producing a synthetic leather and the like, a nonwoven fabric substrate is impregnated with a composition comprising polyurethane as a main component and subjected to surface treatment, or woven or knitted fabric as base fabric is coated with the above composition, producing a synthetic leather and the like. Such synthetic leather and the like have excellent hand and external appearance and the like, and hence have been widely used in shoes, clothes, furniture, gloves, automobile seats and the like.

“However, when conventional polyurethane is used in, for example, shoes and clothes, a problem is caused in that the moisture permeability is unsatisfactory such that those who use them feel moist, or an unpleasant smell is generated. Further, when the polyurethane is used in furniture and automobile seats, in addition to the problem of causing users to feel moist, there is a disadvantage in that the stain resistance, particularly, resistance to a stain due to a sebum component is poor so that it is difficult to remove a stain caused by the use for a long term. The root of these problems resides in inherent hydrophobicity of polyurethane which is a raw material for the synthetic leather. Therefore, in order to solve these problems, an improvement of the hydrophilicity of polyurethane is significant, and further it is important that polyurethane does not swell even when being in contact with water for achieving actual use in various applications.

“As a method of improving the hydrophilicity of polyurethane, for example, a method using polyurethane comprised mainly of polyoxyethylene glycol has been proposed (see, for example, PTL 1). However, polyoxyethylene glycol which is a raw material for polyurethane has high water absorption properties, and thus causes a problem in that the polyurethane swells due to a contact with water when actually used, causing a change in the external appearance or removal from a substrate. Further, there is another problem in that the ether group concentration of the system is so high that only poor light resistance, heat resistance and the like can be obtained, making it difficult to develop the use of polyurethane in furniture and car applications which need durability.”

In addition to the background information obtained for this patent application, NewsRx journalists also obtained the inventors’ summary information for this patent application: “Technical Problem

“A task to be achieved by the present invention is to provide a method for producing a semi-IPN composite having excellent resistance to swelling by water.

“Solution to Problem

“The present invention is directed to a method for producing a semi-IPN composite, including: mixing a polyurethane (A) and a polymerization product (B) of a hydrophilic acrylic monomer (b1) and an acrylic monomer (b2) having a hydrolyzable silyl group; and causing the polymerization product (B) to undergo crosslinking.

“Advantageous Effects of Invention

“The semi-INP composite obtained by the method of the invention has excellent resistance to swelling by water. Therefore, the semi-IPN composite can be advantageously used as a moisture-permeable, waterproof cloth for clothing, medical, and sanitary uses and the like; and a skin layer or a topcoat layer of synthetic leather.”

The claims supplied by the inventors are:

“1. A method for producing a semi-IPN composite, comprising: mixing a polyurethane (A) and a polymerization product (B) of a hydrophilic acrylic monomer (b1) and an acrylic monomer (b2) having a hydrolyzable silyl group; and causing the polymerization product (B) to undergo crosslinking.

“2. The method for producing a semi-IPN composite according to claim 1, wherein the hydrophilic acrylic monomer (b1) includes an acrylic monomer (b1-1) having an amide group and an acrylic monomer (b1-2) having an oxyethylene group.

“3. The method for producing a semi-IPN composite according to claim 2, wherein the polymerization ratio (molar ratio) of the acrylic monomer (b1-1) having an amide group, the acrylic monomer (b1-2) having an oxyethylene group, and the acrylic monomer (b2) having a hydrolyzable silyl group {(b1-1)/(b1-2)/(b2)} is in the range of 50/49.5/0.5 to 89/1/10.

“4. The method for producing a semi-IPN composite according to claim 1, wherein the amount of the polymerization product (B) mixed is in the range of 10 to 70 parts by mass, relative to 100 parts by mass of the polyurethane (A).”

URL and more information on this patent application, see: KOMATSUZAKI, Kunihiko; TSENG, Yayi. Method For Producing Semi-Ipn Composite. Filed August 3, 2017 and posted July 25, 2019. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PG01&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.html&r=1&f=G&l=50&s1=%2220190225801%22.PGNR.&OS=DN/20190225801&RS=DN/20190225801

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Japan Daily Report, source Geographic Newsletters

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