Silica with homogeneous layer of silylating agent

Details Silica with homogeneous layer of silylating agent Silica with homogeneous layer of silylating agent

2005-05-03

2005-05-03

Le, H. Thi (Department: 1773)

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

C427S220000, C427S444000, C428S032500, C428S405000

Reexamination Certificate

active

06887518

ABSTRACT:
Silylated silica is prepared by silylating silica with an organosiloxane composed of A units of the formula (I)in-line-formulae description="In-line Formulae" end="lead"?(R13SiO1/2)  (I)in-line-formulae description="In-line Formulae" end="tail"?and B units of the formulae (IIa-c)in-line-formulae description="In-line Formulae" end="lead"?(R12SiO2/2), and/or  (IIa)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(R1SiO3/2), and/or  (IIb)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?(SiO4/2)  (IIc),in-line-formulae description="In-line Formulae" end="tail"?optionally having 1 or 2 attached groups —X on Si atoms, whereX is OR, R being hydrogen or a monovalent alkyl radical having 1-4 carbon atoms, halogen, or acetoxy,R1is a saturated or unsaturated, monovalent, optionally halogenated C1-18hydrocarbon radical the groups ≡SiX or ═SiX2optionally present in a number C, wherein A, B, and C satisfy the relationships:in-line-formulae description="In-line Formulae" end="lead"?1≦B≦100 or 750<B<10 000,in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?B≧A+C,in-line-formulae description="In-line Formulae" end="tail"?and, when A+C=0, 10≦B≦100 or 750<B<10 000. The silylated silica has a particularly homogenous coating of silylating agent.

REFERENCES:
patent: 5352491 (1994-10-01), Cifuentes et al.
patent: 5795690 (1998-08-01), Takegawa et al.
patent: 5807501 (1998-09-01), Burns et al.
patent: 5851715 (1998-12-01), Barthel et al.
patent: 5908660 (1999-06-01), Griffith et al.
patent: 6025077 (2000-02-01), Yamaki et al.
patent: 6063863 (2000-05-01), Yu et al.
patent: 6184408 (2001-02-01), Burns et al.
patent: 6534044 (2003-03-01), Wada et al.
patent: 20020168524 (2002-11-01), Kerner et al.
patent: 0 686 676 (1995-12-01), None
patent: 0 860 478 (1998-08-01), None
patent: 1 204 006 (2002-05-01), None
patent: 1 236 773 (2002-09-01), None
English Derwent Abstract AN 1996-021221 [3] Corresponding To EP 0 686 676 A1.

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