Patent EP0634286A1 successfully refreshed from Google Patents.
EP0634286A1
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Alumina sol coating fluid and recording sheet
Assignee: AGC Inc
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Filing: 1994-07-13
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Granted: —
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Expires: 2014-07-13
Abstract
Abstract An alumina sol coating fluid containing an alumina hydrate and a polyvinyl alcohol and having boric acid or a borate incorporated therein.
Inventors
- 👤 Hitoshi C/O Asahi Glass Company Ltd. Kijimuta
- 👤 Masaaki C/O Asahi Glass Company Ltd. Saito
- 👤 Yasumasa C/O Asahi Glass Company Ltd. Yukawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 07:39
CPC Classifications
B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5218; B41M5/5254; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
22 words
An alumina sol coating fluid containing an alumina hydrate and a polyvinyl alcohol and having boric acid or a borate incorporated therein.
Claim 2
Dependent Claim
15 words
The alumina sol coating fluid according to Claim 1, wherein the alumina hydrate is boehmite.
Claim 3
Dependent Claim
36 words
The alumina sol coating fluid according to Claim 1, wherein the boric acid or the borate is incorporated in an amount of from 0.1 to 10 wt% as calculated as H₃BO₃ relative to the polyvinyl alcohol.
Claim 4
Dependent Claim
26 words
The alumina sol coating fluid according to Claim 1, wherein the content of the alumina hydrate in the coating fluid is from 10 to 30 wt%.
Claim 5
Dependent Claim
24 words
The alumina sol coating fluid according to Claim 1, wherein the polyvinyl alcohol is from 5 to 50 wt% relative to the alumina hydrate.
Claim 6
Dependent Claim
28 words
The alumina coating fluid according to Claim 1, wherein the polyvinyl alcohol has a saponification degree of at least 90% and a polymerization degree of at least 500.
Claim 7
Dependent Claim
60 words
A recording sheet comprising a substrate and a alumina hydrate layer formed thereon, wherein the alumina hydrate layer contains a polyvinyl alcohol in an amount of from 5 to 50 wt% relative to the alumina hydrate, and boric acid or a borate in an amount of from 0.1 to 10 wt% as calculated as H₃BO₃ relative to the polyvinyl alcohol.
Claim 8
Dependent Claim
13 words
The recording sheet according to Claim 7, wherein the alumina hydrate is boehmite.
Claim 9
Dependent Claim
39 words
The recording sheet according to Claim 7, wherein the alumina hydrate layer has a porous structure consisting essentially of pores with a radius of 1 to 15 nm and having a pore volume of from 0.3 to 1.0 cc/g.
Claim 10
Dependent Claim
52 words
The recording sheet according to Claim 7, wherein the average pore diameter of the alumina hydrate layer is from 1.5 to 8 nm, and the volume of pores with a radius within a range of ± 1 nm of the average pore radius is at least 45% of the total pore volume.
References Cited (Backward Citations)
EP0407720A1
Cited
EP0493100A1
Cited
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