Patent US4895759A successfully refreshed from Google Patents.
US4895759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Saturating grade paper
Assignee: PPG Industries Ohio Inc
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Filing: 1989-03-02
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Granted: 1990-01-23
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Expires: 2009-03-02
Abstract
Abstract Described is a titanium dioxide-containing resin saturable paper sheet in which from about 5 to about 40 weight percent of the titanium dioxide filler is replaced with amorphous precipitated silica having an essentially neutral to slightly alkaline, e.g., 6.5 to 8.5, pH and a medium agglomerate particle size of less than 30 micrometers, e.g., 3 to 10 micrometers. The BET surface area of the silica may vary from about 25 to about 200 m 2 /g, e.g., 50 to 100 m 2 /g. Also described are decorative laminates in which the core of the laminate contains at least one of such saturable paper sheets.
Inventors
- 👤 Roger A. Crawford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/18; B32B5/16; B32B29/00; B32B29/04; D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; D21H17/675; D21H17/68; D21H21/00; D21H21/50; D21H21/52; D21H27/00; D21H27/30; B32B2260/00; B32B2260/02; B32B2260/028; B32B2260/04; B32B2260/046; B32B2315/00; B32B2315/02; B32B2317/00; B32B2317/12; B32B2317/122; B32B2451/00; Y; Y10; Y10S; Y10S162/00; Y10S162/05; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/259; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957; Y10T428/31964; Y10T428/31971; Y10T428/31993
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
79 words
A resin saturable paper sheet containing titanium dioxide as the principal filler and from about 5 to about 40 weight percent, basis the titanium dioxide, of amorphous precipitated silica having a BET surface area of between about 25 and 200 square meters per gram, a pH of between about 6 and 9.5 and a median agglomerate particle size of less than about 30 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 2
Dependent Claim
79 words
A resin saturable paper sheet containing titanium dioxide as the principal filler and from about 5 to about 40 weight percent, basis the titanium dioxide, of amorphous precipitated silica having a BET surface area of between about 25 and 200 square meters per gram, a pH of between about 6 and 9.5 and a median agglomerate particle size of less than about 30 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 3
Dependent Claim
47 words
The paper sheet of claim 1 wherein the amorphous precipitated silica has a BET surface area of between about 40 and about 120 square meters per gram, a pH between about 6.5 and 8.5 and a median agglomerate particle size of between about 3 and 10 micrometers.
Claim 4
Dependent Claim
24 words
The paper sheet of claim 2 wherein the amount of silica is from about 10 to about 25 weight percent, basis the titanium dioxide.
Claim 5
Dependent Claim
45 words
The paper sheet of claim 3 wherein the amorphous precipitated silica has a BET surface area of between about 50 and 100 square meters per gram, a median agglomerate particle size of between 3 and 5 micrometers, and a pH between about 6.5 and 7.5.
Claim 6
Dependent Claim
24 words
The paper sheet of claim 4 wherein the BET surface area of the silica is between about 60 and 90 square meters per gram.
Claim 7
Dependent Claim
16 words
The paper sheet of claim 4 wherein the titanium dioxide is of the rutile crystalline form.
Claim 8
Dependent Claim
15 words
The paper sheet of claim 6 where the paper is prepared from bleached kraft paper.
Claim 9
Dependent Claim
46 words
The paper sheet of claim 3 wherein the amorphous precipitated silica has a BET surface area of between 50 and 100 square meters per gram, a median agglomerate particle size of between 7 and 10 micrometers, and a pH of between about 8 and about 8.5.
Claim 10
Dependent Claim
25 words
The paper sheet of claim 8 wherein the BET surface area of the silica is between about 50 and about 80 square meters per gram.
Claim 11
Dependent Claim
16 words
The paper sheet of claim 8 wherein the titanium dioxide is of the rutile crystalline form.
Claim 12
Dependent Claim
15 words
The paper sheet of claim 10 wherein the paper is prepared from bleached kraft paper.
Claim 13
Dependent Claim
90 words
A resin saturable paper sheet of bleached kraft paper, said paper sheet containing rutile titanium dioxide as the principal filler and from about 10 to about 25 weight percent, basis the titantium dioxide, of amorphous precipitated silica having a BET surface area of between about 50 and 90 square meters per gram, a pH in the range of between about 6.5 and 8.5 and a median agglomerate particle size of between 3 and 10 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 14
Dependent Claim
90 words
A resin saturable paper sheet of bleached kraft paper, said paper sheet containing rutile titanium dioxide as the principal filler and from about 10 to about 25 weight percent, basis the titantium dioxide, of amorphous precipitated silica having a BET surface area of between about 50 and 90 square meters per gram, a pH in the range of between about 6.5 and 8.5 and a median agglomerate particle size of between 3 and 10 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 15
Dependent Claim
15 words
A paper sheet of claim 12 which has been impregnated with a synthetic resinous composition.
Claim 16
Dependent Claim
25 words
A paper sheet of claim 13 wherein the synthetic resinous composition is selected from the group consisting of phenol-formaldehyde resins, melamine-formaldehyde resins and polyester resins.
Claim 17
Dependent Claim
100 words
In a decorative laminate comprising a core of a least one sheet of titanium dioxide-filled saturable paper sheet that has been impregnated with a synthetic laminating resin composition, the improvement wherein the saturable paper sheet contains from about 5 to about 40 weight percent, basis the titanium dioxide, of amorphous precipitated silica having a BET surface area of between about 25 and 200 square meters per gram, a pH of between 6 and 9.5, and a median agglomerate particle size of less than 30 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 18
Dependent Claim
100 words
In a decorative laminate comprising a core of a least one sheet of titanium dioxide-filled saturable paper sheet that has been impregnated with a synthetic laminating resin composition, the improvement wherein the saturable paper sheet contains from about 5 to about 40 weight percent, basis the titanium dioxide, of amorphous precipitated silica having a BET surface area of between about 25 and 200 square meters per gram, a pH of between 6 and 9.5, and a median agglomerate particle size of less than 30 micrometers, said silica containing less than about 1 weight percent of calcium (calculated as calcium oxide).
Claim 19
Dependent Claim
68 words
The decorative laminate of claim 15 wherein the saturable paper sheet contains from about 10 to about 25 weight percent, basis the titanium dioxide, of the amorphous precipitated silica and the amorphous precipitated silica has a BET surface area of between about 50 and about 100 square meters per gram, a pH of between 6.5 and 8.5 and a median agglomerate particle size between 3 and 10 micrometers.
Claim 20
Dependent Claim
48 words
The decorative laminate of claim 16 wherein the saturable paper sheet is prepared from bleached kraft paper, the silica has a median agglomerate particle size between about 3 and 5 micrometers and a pH between 6.5 and 7.5, and the titanium dioxide is of the rutile crystalline form.
Claim 21
Dependent Claim
24 words
The decorative laminate of claim 17 wherein the silica has a BET surface area of from about 60 to 90 square meters per gram.
Claim 22
Dependent Claim
31 words
The decorative laminate of claim 18, wherein the saturable paper is impregnated with a synthetic laminating resin composition selected from the group consisting of phenol-formaldehyde resins, melamine-formaldehyde resins and polyester resins.
Claim 23
Dependent Claim
52 words
The decorative laminate of claim 16 wherein the saturable paper sheet is prepared from bleached kraft paper, the silica has a median agglomerate particle size between about 7 and 10 micrometers and a pH of between about 8 and about 8.5 micrometers, and the titanium dioxide is of the rutile crystalline form.
Claim 24
Dependent Claim
25 words
The decorative laminate of claim 20 wherein the silica has a BET surface area of from about 50 to about 80 square meters per gram.
Claim 25
Dependent Claim
32 words
The decorative laminate of claim 21 wherein the saturable paper sheet is impregnated with a synthetic laminating resin composition selected from the group consisting of phenol-formaldehyde resins, melamine-formaldehyde resins and polyester resins.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |