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Core/shell polymer particles as surface sizing agents

  • US 10,640,926 B2
  • Filed: 09/02/2016
  • Issued: 05/05/2020
  • Est. Priority Date: 09/04/2015
  • Status: Active Grant
First Claim
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1. A core/shell polymer particle for surface sizing of cellulosic products,wherein the core polymer and the shell polymer of the core/shell polymer particle are polymerized from monomers comprising one or more selected from tert-butyl acrylate, n-butyl acrylate, and acrylonitrile;

  • provided that the polymer of the core/shell polymer particle comprises at least 40% by weight of tert-butyl acrylate and at least 50% by combined weight of at least one of tert-butyl acrylate, n-butyl acrylate, and acrylonitrile, based on the total weight of the monomers of the core/shell polymer particle;

    wherein the core/shell polymer comprises;

    (a) a core polymer polymerized from monomers comprising at least 25% by weight, of monomers selected from tert-butyl acrylate, n-butyl acrylate, and acrylonitrile; and

    (b) a shell polymer polymerized from monomers comprising at least 25% by weight, of tert-butyl acrylate, based on total weight of the monomers of the core/shell polymer particle, and wherein the shell polymer encapsulates the core polymer; and

    wherein 10 to 60 wt % of the core/shell polymer particle is degraded starch with a molecular weight Mn of 500 to 10,000.

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