HIGH MOLECULAR WEIGHT POLY(METHACRYLIC ACID)

    公开(公告)号:US20210230321A1

    公开(公告)日:2021-07-29

    申请号:US17229513

    申请日:2021-04-13

    申请人: Alcon Inc.

    IPC分类号: C08F20/18 C08F2/10

    摘要: The invention is generally related to a process for producing a relatively high molecular weight poly(methacrylic acid) (“PMAA”) in a water-based system. The process of the invention comprises polymerization of from about 1% to about 20% by weight of methacrylic acid in water or a water-based system in the presence of thiol compound and an azo radical initiator under controlled reaction and process conditions. A process of the invention can be easily scaled up into the pilot scale for producing large quantities of high molecular weight PMAAs. The invention is also related to high molecular weight poly(methacrylic acid)s obtained according to a process of the invention.

    Block copolymer and surface treatment agent using same

    公开(公告)号:US11046803B2

    公开(公告)日:2021-06-29

    申请号:US16322361

    申请日:2017-07-28

    申请人: TOSOH CORPORATION

    摘要: The present invention addresses the problem of providing a block copolymer which is useful as a surface treatment agent for cell culture substrates, said surface treatment agent enabling cell separation in a short period of time. The above-mentioned problem is solved by a block copolymer that includes the following blocks (A), (B) and (C): (A) a temperature-responsive polymer block that has a lower critical solution temperature (LCST) within the range of from 0° C. to 50° C. with respect to water (B) a hydrophilic polymer block that does not have an LCST within the range of from 0° C. to 50° C., while having an HLB value within the range of from 9 (inclusive) to 20 (exclusive) (C) a hydrophobic polymer block that does not have an LCST within the range of from 0° C. to 50° C., while having an HLB value within the range of from 0 (inclusive) to 9 (exclusive).

    METHOD FOR PRODUCING INDIUM TIN OXIDE PARTICLES AND METHOD FOR PRODUCING CURABLE COMPOSITION

    公开(公告)号:US20210162500A1

    公开(公告)日:2021-06-03

    申请号:US17169563

    申请日:2021-02-08

    IPC分类号: B22F9/16 C08F20/18

    摘要: Provided are a method for producing indium tin oxide particles and a method for producing a curable composition, the methods including a step of obtaining a precursor solution including indium and tin by heating indium acetate and tin acetate in a solvent including a carboxylic acid and having 6 to 20 carbon atoms, and a step of obtaining a reaction solution including indium tin oxide particles by dropwise adding the obtained precursor solution to a solvent having a hydroxy group and having 14 to 22 carbon atoms, which has a temperature of 230° C. to 320° C., in which an acetic acid concentration in the precursor solution is in a range of 0.5% by mass to 6% by mass.

    Molding material, sheet molding compound and fiber-reinforced composite material

    公开(公告)号:US10899856B2

    公开(公告)日:2021-01-26

    申请号:US16151548

    申请日:2018-10-04

    摘要: The present invention provides a SMC of which excessive thickening with time is suppressed while of which sufficient initial thickening by an isocyanate-based thickener is maintained, particularly of which a decrease in flowability at the time of molding to be easily actualized in the case of containing an aromatic vinyl compound such as styrene is suppressed, and which exhibits excellent storage stability and moldability, a molding material for obtaining the SMC, and a fiber-reinforced composite material using the SMC. The invention provides a molding material including: a matrix resin composition containing the following Component (A), the following Component (B), the following Component (D) and the following Component (E); and the following Component (C), in which a proportion of the Component (E) with respect to 100 parts by mass of a sum of the Component (A) and the Component (B) is 0.002 part by mass or more and 0.08 part by mass or less: Component (A): a compound having either or both of a hydroxyl group and a carboxyl group and a polymerizable unsaturated group, Component (B): an aromatic vinyl compound, Component (C): a reinforcing fiber bundle having a fiber length of 5 mm or more and 120 mm or less, Component (D): an isocyanate compound, and Component (E): a metal chelate compound.