Preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units
Patent 4661557 Issued on April 28, 1987. Estimated Expiration Date: 
June 27, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 27, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 06/749542 filed on 06/27/1985US Classes:524/770, Ketone or aldehyde as DNRM524/354, Aldehyde DNRM,i.e., C-(C=O) H524/819, Hydrocarbon monomer with carboxylic acid, salt, or nonnitrogen containing derivative monomer524/822, Two or more hydrocarbon monomers524/823, Two or more monomers-containing carboxylic acid or derivative524/824Aromatic monomerExaminersPrimary: Schofer, Joseph L.Assistant: Reddick, Judy M. Attorney, Agent or FirmInternational ClassesC08F 212/00 (20060101)C08F 212/06 (20060101) D21H 19/00 (20060101) D21H 19/58 (20060101) Foreign Application Priority Data1984-06-28 DEAbstractA process for the preparation of stable aqueous polymer dispersions which contain an alkenyl-aromatic compound as copolymerized units, by polymerizing monomer mixtures which contain(a) not less than 2% by weight of an alkenyl-aromatic compound and(b) from 0.5 to 10% by weight of an ethylenically unsaturated C3 -C5 -carboxylic acid and/or its amide and/or its nitrile and/or an ethylenically unsaturated monomer containing sulfonic acid groups, with or without(c) acrylic acid esters, methacrylic acid esters and/or butadienein aqueous emulsion in the presence of a polymerization initiator, with or without an emulsifier and with or without a polymerization regulator, at a pH below 7, in the presence of from 0.2 to 2% by weight of formaldehyde.Field of SearchS-containing monomerHydrocarbon monomer with carboxylic acid, salt, or nonnitrogen containing derivative monomer With N monomer Hydrocarbon monomer contains at least two ethylenic groups Ketone or aldehyde as DNRM Aldehyde DNRM,i.e., C-(C=O) H Two or more hydrocarbon monomers Two or more monomers-containing carboxylic acid or derivative Aromatic monomer | |
