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Crosslinked emulsions of pre-formed silicon modified organic polymers

  • US 5,840,800 A
  • Filed: 11/02/1995
  • Issued: 11/24/1998
  • Est. Priority Date: 11/02/1995
  • Status: Expired due to Term
First Claim
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1. A method of forming a aqueous dispersion of a crosslinked silicon-modified organic polymer comprising:

  • forming a premixture comprising;

    a) 100 weight parts of silicon-modified organic polymer,b) 0.5 to 10 weight parts surfactant andc) 0.5 to 1000 weight parts water;

    agitating the premixture to form an emulsion; and

    facilitating the crosslinking of the silicon-modified organic polymer in the emulsion;

    wherein, the silicon-modified organic polymer is an organic polymer having a viscosity of 5 to 500 Pa.s, a glass transition temperature of less than 20°

    C., and 1 to 5 substitutents represented by the formula;

    
    
    space="preserve" listing-type="equation">--Y--(X.sub.b R.sup.1.sub.2-b SiO).sub.m SiX.sub.a R.sup.1.sub.3-awherein R1 is the same or different alkyl, alkenyl, aryl, or aralkyl group having 1 to 20 carbon atoms, or a triorganosiloxy group represented by the formula R23 SiO--, where R2 individually is a monovalent hydrocarbon group having from 1 to 20 carbon atoms,X is the same or different hydroxyl group, condensable group or hydrolyzable group;

    Y is a divalent group which forms hydrolytically stable bonds to the organic polymer and to a silicon atom of the substituent;

    a is an integer from 0 to 3,b is an integer from 0 to 2 with the proviso that if a is 0 then b is 1 or 2 in at least one siloxane unit of the substituent and m is an integer of from 0 to 19 with the proviso that if m is 0 then a is 1, 2, or 3.

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