US4528238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of fibre-reinforced cementitious composition
Assignee: Imperial Chemical Industries Ltd
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Filing: 1983-12-30
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Granted: 1985-07-09
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Expires: 2003-12-30
Abstract
Abstract A process for the production of a moldable fibre-containing cementitious composition in which at least one mat of a water-insoluble fibrous material is contacted with at least one surface of a shaped article of a moldable cementitious composition, the cementitious composition comprising a homogeneous mixture of at least one hydraulic cement, water in a proportion of not more than 25% by weight of the hydraulic cement in the composition, and at least one water-soluble or water-dispersible polymeric material in a proportion of at least 1% by weight of the hydraulic cement in the composition. The moldable cementitious composition may be in the form of a sheet and in the process two or more sheets may be used with a fibrous mat being sandwiched between adjacent pairs of sheets of cementitious composition. Also a moldable fibre-containing cementitious composition and fibre-reinforced cement product produced by curing of the composition.
Inventors
- 👤 Neil M. Alford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:47
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; B; B28; B28B; B28B1/00; B28B1/52; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3472; Y10T442/3602; Y10T442/361; Y10T442/3854; Y10T442/3919; Y10T442/60; Y10T442/659; Y10T442/665
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
111 words
A process for the production of a mouldable fibre-containing cementitious composition by mixing a fibrous material with an aqueous cementitious composition comprising hydraulic cement and water, wherein at least one mat of a water-insoluble fibrous material is contacted with at least one surface of a shaped article of a mouldable cementitious composition and in that the cementitious composition comprises a homogeneous mixture of at least one hydraulic cement, water in a proportion of not more than 25% by weight of the hydraulic cement in the composition, and at least one water-soluble or water-dispersible polymeric material in a proportion of at least 1% by weight of the hydraulic cement in the composition.
Claim 2
Dependent Claim
111 words
A process for the production of a mouldable fibre-containing cementitious composition by mixing a fibrous material with an aqueous cementitious composition comprising hydraulic cement and water, wherein at least one mat of a water-insoluble fibrous material is contacted with at least one surface of a shaped article of a mouldable cementitious composition and in that the cementitious composition comprises a homogeneous mixture of at least one hydraulic cement, water in a proportion of not more than 25% by weight of the hydraulic cement in the composition, and at least one water-soluble or water-dispersible polymeric material in a proportion of at least 1% by weight of the hydraulic cement in the composition.
Claim 3
Dependent Claim
25 words
A process as claimed in claim 1 characterised in that the shaped article of a mouldable cementitious composition is in the form of a sheet.
Claim 4
Dependent Claim
31 words
A process as claimed in claim 1 or claim 2 characterised in that the cementitious composition comprises at least 5% of water by weight of the hydraulic cement in the composition.
Claim 5
Dependent Claim
29 words
A process as claimed in claim 1 characterised in that the cementitious composition comprises not more than 20% of water by weight of the hydraulic cement in the composition.
Claim 6
Dependent Claim
32 words
A process as claimed in claim 1 characterised in that the cementitious composition comprises 3% to 15% of water-soluble or water-dispersible polymeric material by weight of the hydraulic cement in the composition.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 1 characterised in that the water-soluble or water-dispersible polymeric material comprises hydroxypropyl methyl cellulose.
Claim 8
Dependent Claim
21 words
A process as claimed in claim 1 characterised in that the water-soluble or water-dispersible polymeric material comprises partially hydrolysed polyvinyl acetate.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1 characterised in that the hydraulic cement is selected from a calcium silicate cement and a calcium aluminate cement.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 1 characterised in that a mat of fibrous material is pressed into at least one surface of a shaped article of a mouldable cementitious composition.
Claim 11
Dependent Claim
26 words
A process as claimed in claim 1 characterised in that one or more mats of fibrous material are pressed between two sheets of mouldable cementitious composition.
Claim 12
Dependent Claim
40 words
A process as claimed in claim 1 characterised in that more than two sheets of mouldable cementitious composition are used and one or more mats of fibrous material are pressed between each adjacent pair of sheets of mouldable cementitious composition.
Claim 13
Dependent Claim
32 words
A process as claimed in claim 1 characterised in that contact between the shaped article of a mouldable cementitious composition and the mat of fibrous material is effected in a hydraulic press.
Claim 14
Dependent Claim
37 words
A process as claimed in claim 1 characterised in that one or more sheets of mouldable cementitious composition and one or more mats of fibrous material are passed through the nip between a pair of rotating rolls.
Claim 15
Dependent Claim
19 words
A process as claimed in claim 1 characterised in that the mat of fibrous material is a woven mat.
Claim 16
Dependent Claim
24 words
A process as claimed in claim 1 characterised in that the fibrous material is selected from glass fibre, steel fibre and a polyamide fibre.
Claim 17
Dependent Claim
48 words
A process as claimed in claim 1 characterised in that the mat of fibrous material is used in a proportion such that in a cement product produced by curing of the cementitious composition there is present 0.5% to 20% of mat by volume of the fibre-containing cement product.
Claim 18
Dependent Claim
76 words
A process as claimed in claim 1 characterised in that the cementitious composition comprises at least one particulate material, and in that there is present in the composition not more than 25% of water by weight of the total weight of the hydraulic cement and particulate material in the composition, and at least 1% of water-soluble or water-dispersible polymeric material by weight of the total weight of the hydraulic cement and particulate material in the composition.
Claim 19
Dependent Claim
85 words
A shaped article of a mouldable fibre-containing cementitious composition wherein the cementitious composition is a homogeneous mixture of at least one hydraulic cement, water in a proportion of not more than 25% by weight of the hydraulic cement in the composition, and at least one water-soluble or water-dispersible polymeric material in a proportion of at least 1% by weight of the hydraulic cement in the composition, and in that at least one mat of a water-insoluble fibrous material is in contact with the shaped article.
Claim 20
Dependent Claim
85 words
A shaped article of a mouldable fibre-containing cementitious composition wherein the cementitious composition is a homogeneous mixture of at least one hydraulic cement, water in a proportion of not more than 25% by weight of the hydraulic cement in the composition, and at least one water-soluble or water-dispersible polymeric material in a proportion of at least 1% by weight of the hydraulic cement in the composition, and in that at least one mat of a water-insoluble fibrous material is in contact with the shaped article.
Claim 21
Dependent Claim
26 words
A shaped article as claimed in claim 18 characterised in that the shaped article of a mouldable cementitious composition is in the form of a sheet.
Claim 22
Dependent Claim
32 words
A shaped article as claimed in claim 18 or claim 19 characterised in that the cementitious composition comprises at least 5% of water by weight of the hydraulic cement in the composition.
Claim 23
Dependent Claim
30 words
A shaped article as claimed in claim 18 characterised in that the cementitious composition comprises not more than 20% of water by weight of the hydraulic cement in the composition.
Claim 24
Dependent Claim
33 words
A shaped article as claimed in claim 18 characterised in that the cementitious composition comprises 3% to 15% of water-soluble or water-dispersible polymeric material by weight of the hydraulic cement in the composition.
Claim 25
Dependent Claim
21 words
A shaped article as claimed in claim 18 characterised in that the water-soluble or water-dispersible polymeric material comprises hydroxypropyl methyl cellulose.
Claim 26
Dependent Claim
22 words
A shaped article as claimed in claim 18 characterised in that the water-soluble or water-dispersible polymeric material comprises partially hydrolysed polyvinyl acetate.
Claim 27
Dependent Claim
26 words
A shaped article as claimed in claim 18 characterised in that the hydraulic cement is selected from a calcium silicate cement and a calcium aluminate cement.
Claim 28
Dependent Claim
32 words
A shaped article as claimed in claim 18 characterised in that a mat of fibrous material is embedded in at least one surface of a shaped article of a mouldable cementitious composition.
Claim 29
Dependent Claim
27 words
A shaped article as claimed in claim 18 characterised in that one or more mats of fibrous material are sandwiched between two sheets of mouldable cementitious compositions.
Claim 30
Dependent Claim
44 words
A shaped article as claimed in claim 18 characterised in that the article contains more than two sheets of mouldable cementitious composition and in that one or more mats of fibrous material are sandwiched between each adjacent pair of sheets of mouldable cementitious composition.
Claim 31
Dependent Claim
20 words
A shaped article as claimed in claim 18 characterised in that the mat of fibrous material is a woven mat.
Claim 32
Dependent Claim
25 words
A shaped article as claimed in claim 18 characterised in that the fibrous material is selected from glass fibre, steel fibre and a polyamide fibre.
Claim 33
Dependent Claim
49 words
A shaped article as claimed in claim 18 characterised in that the mat of fibrous material is present in a proportion such that in a cement product produced by curing of the cementitious composition there is present 0.5% to 20% of mat by volume of the fibre-containing cement product.
Claim 34
Dependent Claim
77 words
A shaped article as claimed in claim 18 characterised in that the cementitious composition comprises at least one particulate material, and in that there is present in the composition not more than 25% of water by weight of the total weight of the hydraulic cement and particulate material in the composition, and at least 1% of water-soluble or water-dispersible polymeric material by weight of the total weight of the hydraulic cement and particulate material in the composition.
Claim 35
Dependent Claim
34 words
A fibre-containing cement product characterised in that the product is produced by curing of a shaped article of a cementitious composition containing a mat of a water-insoluble fibrous material as claimed in claim 18.
References Cited (Backward Citations)
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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) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |