LATEX MED HARD YTA OCH MJUK KERNA

摘要

Paper coating compositions manufactured from a novel latex comprising about 40 to 60 weight percent of heterogeneous polymer particles which have: (1) an initial domain, comprising about 50% by volume of the particle which is a polymer of a monomer composition comprising: (a) From about 55 to about 65 parts by weight of a monovinylidene aromatic monomer; (b) From about 45 to about 35 parts by weight of an aliphatic C4-6 conjugated diene monomer; and per 100 parts by weight of the total of said monovinylidene aromatic monomer and said aliphatic C4-6 conjugated diene monomer; (c) from about 0.5 to 5 parts by weight of C3-5 ethylenically unsaturated carboxylic acid; and (d) from about 0.5 to 5 parts by weight of a C3-6 ethylenically unsaturated primary amide; and (2) a subsequent domain comprising about 50% by volume of the particle which is a polymer of a monomer compo- sition comprising: (a) From about 75 to 85 parts by weight of a monovinylidene aromatic monomer; (b) From about 25 to 15 parts by weight of an aliphatic C4-6 conjugated diene monomer and per 100 parts by weight of the total of said monovinylidene aromatic monomer and said aliphatic C4-6 conjugated diene monomer; (c) from about 0.5 to 5 parts by weight of a C3-5 ethylenically unsaturated carboxylic acid and; (d) from about 0.5 to 5 parts by weight of a C3-6 ethylenically unsaturated primary amide. Such compositions provide enhanced gloss and pick characteristics.