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Heterogeneous latices as binders in porous particle structures
Author(s) -
Rigdahl M.,
Lason L.,
Hagen R.,
Karlsson O.,
Wesslén B.
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19970131)63:5<661::aid-app14>3.0.co;2-x
Subject(s) - materials science , composite material , porosity , coating , polymer , copolymer , gloss (optics) , polystyrene , styrene , polymerization , methacrylic acid , polymer chemistry , chemical engineering , engineering
Heterogeneous carboxylated styrene‐butadiene (S/Bu) latices were prepared by a two‐stage polymerization process, using three seeds of polystyrene with different molecular weights. The second‐stage polymer was a copolymer with a fixed S/Bu‐ratio of 1 and a methacrylic acid (MAA) content of either 1 or 10 wt %. It has been found that the morphology of the films made from these latices influenced the modulus in the rubbery region of these films. The heterogeneous latices were used as binders in porous structures based on micron‐sized kaolin particles. Such structures are typically employed as paper coatings. Polyester substrates were coated with aqueous suspensions containing the kaolin particles and the heterogeneous latex. The coatings were dried at room temperature, which corresponds to the rubbery region of the latex films. It was found that a higher modulus (which is determined here by the morphology of the latex film) in the rubbery region of the films was associated with coating layers with higher porosity, greater light scattering ability, and higher coating gloss. This is interpreted as being the result of a retarded shrinkage of the coating layers during the drying of these structures due to the increase in modulus of the latex films. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 63: 661–670, 1997