NEUTRALIZING AGENT FOR ALKALI-GELATINIZED STARCH PASTE

摘要

PURPOSE:To provide the titled neutralizing agent which gives a paste soln. having a stable viscosity, consisting of an ethylenically unsaturated monocarboxylic acid (co)polymer (salt). CONSTITUTION:A polymer obtd. by polymerizing an ethylenically unsaturated monocarboxylic acid [e.g. (meth)acrylic acid] in the presence of a polymn. initiator such as ammonium persulfate in an aq. medium is used as a neutralizing agent for alkali-gelatinized starch paste. The polymer may be a copolymer (having an ethylenically unsaturated monocarboxylic acid content of at least 5wt%) of said monocarboxylic acid with other monomer such as methyl methacrylate, ethylene or vinyl acetate. Alternatively, said polymer or copolymer may be in the form of a heat-evaporatable org. salt such as ammonium salt or amine salt. A paste soln. obtd. by using the neutralizing agent does not gel even when left to stand and changes in the viscosity of the paste soln. at 60 deg.C or above are small so that the paste soln. is easy to handle. Further, yarn sized by the paste soln. is excellent in elongation and wear resistance.