Low-temperature film-forming latex based on hydrophobic polymers having a core/shell structure without coalescents
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United States of America Patent
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Apr 20, 2004
Grant Date -
Sep 19, 2002
app pub date -
Apr 30, 2002
filing date -
Aug 28, 1997
priority date (Note) -
Expired
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Abstract
A latex which forms a film by evaporation at a temperature of less than 40.degree. C. is based on hydrophobic polymer particles having a core/shell structure. The particles consist of 70 to 90% by weight of at least one polymer with a soft character having a glass transition temperature of less than 20.degree. C. forming the core, and 10 to 30% by weight of at least one polymer with a hard character having a glass transition temperature of greater than 50.degree. C. forming the shell. When applied to any surface and after drying at low temperature, the latex, without the use of any coalescents or volatile organic compounds, provides a continuous film which is homogeneous, has no surface tack and has good mechanical integrity.
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