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AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsKazuo Kobayashi, Yoshitsugu Morita, Ken Tanaka
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An efficient method is provided for producing water based coating compositions that are capable of forming highly scratch and abrasion resistant matte coatings in which crosslinked silicone particles are well dispersed. The method involves addition to a water based coating composition of a waterborne suspension of crosslinked silicone particles having an average diameter of 0.1-200 μm. The method is characterized in that the suspension is a waterborne crosslinked silicone particle suspension provided by effecting crosslinking of a condensation reaction crosslinkable silicone composition comprising (A) an organopolysiloxane containing at least two silanol groups in each molecule, (B) a crosslinker, and (C) a condensation reaction catalyst. The crosslinking is effected in the emulsified composition in an aqueous solution of an anionic surfactant.
A method of making a water based coating composition comprising adding a waterborne suspension of crosslinked silicone particles that have an average diameter of 0.1-200 μm to a water based coating composition, the waterborne suspension of crosslinked silicone particles being prepared by crosslinking a condensation reaction crosslinkable silicone composition containing (A) an organopolysiloxane having at least two silanol groups in its molecule, (B) a crosslinker, and (C) a condensation reaction catalyst, crosslinking being carried out in an emulsion containing (A)-(C) and an aqueous solution of an anionic surfactant.
A method of making a water based coating composition comprising adding a waterborne suspension of crosslinked silicone particles that have an average diameter of 0.1-200 μm to a water based coating composition, the waterborne suspension of crosslinked silicone particles being prepared by crosslinking a condensation reaction crosslinkable silicone composition containing (A) an organopolysiloxane having at least two silanol groups in its molecule, (B) a crosslinker, and (C) a condensation reaction catalyst, crosslinking being carried out in an emulsion containing (A)-(C) and an aqueous solution of an anionic surfactant, condensation reaction catalyst (C) being a tin (II) salt of an organic acid having no more than 10 carbon atoms.
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