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    AQUEOUS DISPERSION OF COPOLYMER PARTICLES OF VINYL ACETATE AND A CYCLIC KETENE ACETAL MONOMER
    2.
    发明申请
    AQUEOUS DISPERSION OF COPOLYMER PARTICLES OF VINYL ACETATE AND A CYCLIC KETENE ACETAL MONOMER 审中-公开

    公开(公告)号：US20200325260A1

    公开(公告)日：2020-10-15

    申请号：US16822256

    申请日：2020-03-18

    Applicant: Rohm and Haas Company

    Inventor： Matthew Carter ,  James DeFelippis ,  Ralph C. Even ,  Andrew Hejl

    IPC: C08F218/08 ,  C08L31/04

    Abstract: The present invention relates to a composition comprising an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, a cyclic ketene acetal monomer, and a monoethylenically unsaturated acid monomer, or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure: where n and the R groups are as defined herein. The composition of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

    PREPARATION OF A COATINGS FORMULATION WITH ALKALI SWELLABLE POLYMER PARTICLES
    3.
    发明申请
    PREPARATION OF A COATINGS FORMULATION WITH ALKALI SWELLABLE POLYMER PARTICLES 审中-公开

    公开(公告)号：US20200299527A1

    公开(公告)日：2020-09-24

    申请号：US16607257

    申请日：2018-05-02

    Applicant: Dow Global Technologies LLC ,  Rohm and Haas Company

    Inventor： James K. Bardman ,  Jonathan DeRocher ,  Andrew Hejl ,  Antony K. Van Dyk ,  Lin Wang ,  Kimy Yeung

    IPC: C09D7/65 ,  C09D7/40 ,  C08F220/06 ,  C08F220/18 ,  C08F220/14 ,  C08F212/08 ,  C08F2/22 ,  C08L25/14 ,  C08K3/22

    Abstract: The present invention relates to a process for preparing a coatings composition with an open time additive comprising the steps of a) contacting an aqueous dispersion of alkali swellable polymer particles with a rheology modifier and a binder to form a coatings composition with a VOC of less than 50 g/L; and b) neutralizing the alkali swellable particles with a non-volatile base after or upon contact with the rheology modifier and the binder to form swelled multi-staged polymer particles; wherein the alkali swellable polymer particles comprise a shell having a Tg of not greater than 25° C. and an acid functionalized core; and wherein the core-to-shell ratio is in the range of from 1:3.2 to 1:10. The composition arising from the process of the present invention is useful for improving open time, especially for low VOC coatings applications.In another aspect the present invention relates to the preparation of the coatings composition with an open time additive comprising the steps of a) contacting the open time additive with a rheology modifier and a binder to form a coatings composition with a VOC of less than 50 g/L, then b) neutralizing the open time additive to form swelled multi-staged polymer particles, wherein the coatings composition with the open time additive exhibits less than a 50% increase in viscosity than the coating composition without the open time additive.

    Aqueous dispersion of mutlistage polymer particles
    6.
    发明授权
    Aqueous dispersion of mutlistage polymer particles 有权

    公开(公告)号：US11124656B2

    公开(公告)日：2021-09-21

    申请号：US16511061

    申请日：2019-07-15

    Applicant: Rohm and Haas Company

    Inventor： Jonathan DeRocher ,  Andrew Hejl ,  Jessica Levin ,  John J. Rabasco ,  Antony K. Van Dyk ,  Kimy Yeung

    IPC: C09D4/06 ,  C09D133/10 ,  C09D7/65

    Abstract: The present invention relates to a composition comprising an aqueous dispersion of multistage polymer particles with a first phase comprising structural units of a carboxylic acid monomer and a nonionic ethylenically unsaturated monomer; and a second phase with a calculated Tg of less than 50° C. and comprising a mixture of polymers which together comprise structural units of styrene or methyl methacrylate or both; structural units of one or of n-butyl acrylate, 2-ethylhexyl acrylate, ethyl acrylate, or n-butyl methacrylate; and structural units of a carboxylic acid monomer. The composition is useful as an open time additive in coatings formulations.

    Preparation of an aqueous dispersion of copolymer particles of vinyl acetate and a cyclic ketene acetal monomer
    7.
    发明授权
    Preparation of an aqueous dispersion of copolymer particles of vinyl acetate and a cyclic ketene acetal monomer 有权

    公开(公告)号：US11111329B2

    公开(公告)日：2021-09-07

    申请号：US16822292

    申请日：2020-03-18

    Applicant: Rohm and Haas Company

    Inventor： Matthew Carter ,  Ralph C. Even ,  Andrew Hejl

    IPC: C08F218/08 ,  C08L31/04

    Abstract: The present invention relates to a method comprising the steps of a) contacting under emulsion polymerization conditions vinyl acetate; a cyclic ketene acetal monomer; and a monoethylenically unsaturated acid monomer or a salt thereof; to form an aqueous dispersion of copolymer particles comprising structural units of vinyl acetate, the cyclic ketene acetal, and the monoethylenically unsaturated acid monomer or a salt thereof; wherein the cyclic ketene acetal monomer is characterized by following structure: where n and the R groups are as defined herein. The method of the present invention provides a water-borne dispersion that is substantially free of volatile organic solvents and that provides a readily degradable polymer that is useful, for example, in the manufacture of biodegradable packaging products.

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