Patent EP0236945A2 successfully refreshed from Google Patents.
EP0236945A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Monodispersed glycol suspension of fine inorganic oxide particles having excellent dispersion stability and method of improving the slipperiness of polyester film using the monodispersed suspension
Assignee: Nippon Shokubai Co Ltd
•
Filing: 1987-03-05
•
Granted: —
•
Expires: 2007-03-05
Abstract
Abstract A monodispersed glycol suspension having excellent dispersion stability, comprising a monodispersed suspension in a glycol of spherical fine particles of an amorphous inorganic oxide having an average particle diameter of 0.05 to 5 micrometers and a relative particle size standard deviation of 1.0 to 1.5 and containing glycol bonded to its surface. This monodispersed suspension is useful as a raw material for the production of a polyester film having improved slipperiness.
Inventors
- 👤 Tadahiro Yoneda
- 👤 Saburo Nakahara
- 👤 Mitsuo Takeda
- 👤 Midori Kamo
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
B; B82; B82Y; B82Y30/00; B01; B01J; B01J13/00; C; C01; C01B; C01B13/00; C01B13/14; C01B13/32; C08; C08G; C08G67/00; C08G67/02; C08J; C08J5/00; C08J5/18; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C08K3/34; C08K9/00; C08K9/04; G; G11; G11B; G11B5/00; G11B5/62; G11B5/73; G11B5/739; G11B5/73923; G11B5/73927; G11B5/73935; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/01; C01P2004/03; C01P2004/30; C01P2004/32; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/61; C01P2004/62; C01P2004/64; C01P2006/00; C01P2006/12; C01P2006/22; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
53 words
I. A monodispersed glycol suspension having excellent dispersion stability, comprising a monodispersed suspension in a glycol of spherical fine particles of an amorphous inorganic oxide having an average particle diameter of 0.05 to 5 micrometers and a relative particle size standard deviation of 1.0 to 1.5 and containina alvcol bonded to its surface.
Claim 2
Dependent Claim
26 words
The monodispersed glycol suspension of claim I wherein the amount of the bonded glycol is 0.003 to 5 millimoles per gram of the fine oxide particles.
Claim 3
Dependent Claim
23 words
The monodispersed glycol suspension of claim I wherein the fine oxide particles have a relative particle size standard deviation of 1.0 to 1.3
Claim 4
Dependent Claim
24 words
The monodispersed glycol dispersion of claim I wherein the inorganic oxide is composed mainly of silica, titania, alumina, zirconia or a compound oxide thereof.
Claim 5
Dependent Claim
20 words
The monodispersed glycol suspension of claim I wherein the glycol has 2 to 8 carbon atoms and 2 alkanol groups.
Claim 6
Dependent Claim
13 words
The monodispersed glycol suspension of claim 5 wherein the glycol is ethylene glycol.
Claim 7
Dependent Claim
114 words
A process for producing the monodispersed glycol suspension of claim I, which comprises at least the following three steps (1) a first step of hydrolyzing a hydrolyzable organometallic compound in an aqueous solution of an alcohol which may include a glycol to be used in the second step to obtain a suspension of fine particles of an amorphous hydrated inorganic oxide in the alcoholic solution, (2) a second step of substituting a glycol for the alcoholic solvent of the suspension to obtain a glycol suspension of the fine particles of hydrated inorganic oxide, and (3) a third step of heat-treating the glycol suspension to obtain a monodispersed glycol suspension of fine inorganic oxide particles.
Claim 8
Dependent Claim
22 words
The process of claim 7 wherein the inorganic oxide is composed mainly of silica, titania, alumina, zirconia, or a compound oxide thereof.
Claim 9
Dependent Claim
18 words
The process of claim 7 wherein the glycol has 2 to 8 carbon atoms and 2 alkanol groups.
Claim 10
Dependent Claim
11 words
The process of claim 9 wherein the glycol is ethylene glycol.
Claim 11
Dependent Claim
17 words
ll. The process of claim 7 wherein the organometallic compound is a metal alkoxide or its derivative.
Claim 12
Dependent Claim
45 words
The process of claim 7 wherein in the first step, an alcohol having a lower boiling point than the glycol is used, and in the second step, the alcoholic solvent is distilled from the suspension in the alcoholic solution in the presence of the glycol.
Claim 13
Dependent Claim
42 words
The process of claim 7 wherein the heat-treatment temperature (T °C) in the third step is 70≦T≦TB + 10 in which TB represents the boiling point (°C) of the glycol under the pressure at which the heat-treatment is carried out, and TBa70.
Claim 14
Dependent Claim
32 words
The process of claim 7 wherein a coupling agent is added to the resulting suspension in the alcoholic solution after the first step to subject the fine particles to a coupling treatment.
Claim 15
Dependent Claim
22 words
The process of claim 14 wherein the coupling agent is at least one coupling agent selected from silane-, titanate-and aluminate-type coupling agents.
Claim 16
Dependent Claim
66 words
In a method for improving the slipperiness of a polyester film which comprises using a glycol slurry of fine inorganic oxide particles as a raw material for polyester film formation and preparing a film containing 0.005 to 2% by weight, based on the polyester, of the fine particles, the improvement wherein the glycol slurry of the fine particles is the monodispersed glycol suspension of claim I.
Claim 17
Dependent Claim
26 words
The method of claim 16 wherein the glycol slurry of the fine particles is the monodispersed glycol suspension described in any of claims 2 to 6.
Claim 18
Dependent Claim
29 words
The method of claim 16 wherein the glycol slurry of the fine particles is the monodispersed suspension produced by the process of any one of claims 7 to 15.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.