Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1996-07-10
1998-12-22
Reddick, Judy M.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524262, 524263, 524264, 524265, 524266, 524457, 524458, 524506, 524533, 524547, 524730, 524731, 524806, 524817, 524535, C08F 216
Patent
active
058520953
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Technical Field
The present invention relates to an aqueous, silicone-modified acrylate polymer emulsion which is capable of forming a coating having excellent water repellency, water resistance, weatherability, dispersion characteristics of pigment, gloss retentivity, stain resistance and adhesion properties. More particularly, the present invention is concerned with an aqueous, silicone-modified acrylate polymer emulsion, which is an acrylate polymer emulsion produced by subjecting a monomer system (A) comprising an acrylate monomer selected from the group consisting of an acrylic ester, a methacrylic ester and a mixture thereof to emulsion polymerization in an aqueous medium in the presence of an emulsifier (B) selected from the group consisting of a sulfonic acid group-containing ethylenically unsaturated monomer, a sulfonate group-containing ethylenically unsaturated monomer, and a mixture thereof, wherein the acrylate polymer emulsion is silicone-modified using a specific, silicone structure-containing modifier (C) during or after the emulsion polymerization. The aqueous, silicone-modified acrylate polymer emulsion of the present invention can be advantageously used as a paint, an undercoating or finish coating material for building materials, an adhesive, a pressure-sensitive adhesive, a processing agent for papers, or a finish coating material for textile fabrics, especially as a paint, or a finish coating material for building materials.
Prior Art
When an aqueous acrylate polymer emulsion obtained by emulsion polymerization is dried at room temperature or under heated conditions, a coating is obtained which has a relatively good durability. Therefore, the aqueous acrylate polymer emulsion has been widely used as a resin for an aqueous paint. However, when a coating, which is obtained from an acrylate polymer emulsion or from a paint comprising an acrylate polymer emulsion having a pigment incorporated therein, is exposed to outdoor conditions or ultraviolet light, not only is the luster of the coating likely to be rapidly deteriorated but also the gloss retentivity of the coating is poor.
For solving the problems as mentioned above, it was conventionally proposed to add a silicone to an aqueous acrylate polymer emulsion to increase the resistance of a coating formed from the emulsion to ultraviolet light, oxygen, water and various types of solvents, and improve the durability of the coating. With respect to prior art documents which disclose such a technique, reference can be made to Canadian Patent No. 842947, U.S. Pat. No. 3,706,697, Unexamined Japanese Patent Application Laid-Open Specification No. 3-255273 and Unexamined Japanese Patent Application Laid-Open Specification No. 6-122734. However, the emulsions disclosed in these documents have poor water resistance. The reason for this resides in that an emulsifier employed in the technique of each of the above documents does not have a reactivity with the emulsified particles of the aqueous acrylate polymer emulsion but is only adsorbed on the emulsified particles, so that it is likely that water intrudes into the emulsified particles. In European Patent No. 0 401 496, a sulfonic acid group-containing ethylenically unsaturated monomer is employed. However, in European Patent No. 0 401 496, styrene is used in a large amount which is almost the same as the amount of acrylic ester employed and, therefore, the obtained emulsion is disadvantageous in that a coating formed from the emulsion is discolored upon exposure to ultraviolet light and has poor weatherability. In U.S. Pat. No. 5,214,095, an ethylenically unsaturated monomer and a hydrolyzable silane are simultaneously introduced into an emulsion polymerization system in the presence of an aqueous solvent, so that the obtained aqueous emulsion has poor dispersion stability. Even if a dispersant or emulsifier, as a stabilizing agent, is added to this aqueous emulsion, when a coating formation promotor or an inorganic pigment is added to the aqueous emulsion, coagulat
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Kamiyama Yasuyuki
Yamauchi Toyoaki
Asahi Kasei Kogyo Kabushiki Kaisha
Reddick Judy M.
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