(19)
(11)EP 1 118 632 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
01.08.2001 Bulletin 2001/31

(43)Date of publication A2:
25.07.2001 Bulletin 2001/30

(21)Application number: 01100990.9

(22)Date of filing:  17.01.2001
(51)Int. Cl.7C08J 3/05, C09D 201/06
(84)Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30)Priority: 18.01.2000 JP 2000009188

(71)Applicant: JSR Corporation
Tokyo (JP)

(72)Inventors:
  • Katou, Minoru, c/o JSR Corporation
    Tokyo (JP)
  • Tsuruoka, Katsuhiko, c/o JSR Corporation
    Tokyo (JP)

(74)Representative: Leson, Thomas Johannes Alois, Dipl.-Ing. 
Tiedtke-Bühling-Kinne & Partner GbR, TBK-Patent, Bavariaring 4
80336 München
80336 München (DE)

  


(54)Composite particles, composite particle dispersion composition, and method of preparing composite particle dispersion composition


(57) Composite particles capable of forming a coating excelling in weatherability and, in particular, stain-proof characteristics, a composite particle dispersion composition containing the composite particles and excelling in film formability, and a method of preparing the composite particle dispersion composition. The composite particles contain (i) polymer particles having 2-70 wt% of a polymer phase (a) of the core and 98-30 wt% of a polymer phase (b) of the shell, and (ii) a polymer of at least either an organosilicon compound or organometallic compound present at least either on or near the surface of the polymer phase (b), wherein the polymer phase (a) and the polymer phase (b) have different monomer compositions.