US4166751A
Expired / Lapsed
US
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Method for setting gypsum utilizing retarder
Assignee: Idemitsu Kosan Co Ltd
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Filing: 1978-09-08
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Granted: 1979-09-04
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Expires: 1998-09-08
Abstract
Abstract A process for setting gypsum which comprises incorporating carboxyalkylated protein as a setting retarder in gypsum paste in an amount of 0.001 to 5% by weight based upon the weight of the gypsum.
Inventors
- 👤 Azuma Komeiji
- 👤 Nobuo Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:53
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/12; C04B24/14
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
An improved process for setting gypsum wherein water is admixed with gypsum to form a gypsum paste which then sets, the improvement comprising admixing a carboxylated protein in said gypsum paste in an amount of from 0.001 to 5% by weight based upon the weight of the gypsum, whereby the setting time of said gypsum is retarded.
Claim 2
Dependent Claim
57 words
An improved process for setting gypsum wherein water is admixed with gypsum to form a gypsum paste which then sets, the improvement comprising admixing a carboxylated protein in said gypsum paste in an amount of from 0.001 to 5% by weight based upon the weight of the gypsum, whereby the setting time of said gypsum is retarded.
Claim 3
Dependent Claim
30 words
The process of claim 1, wherein the carboxyalkylated protein has a carboxyalkyl group content of from 0.1 to 30% by weight based upon the total weight of the carboxyalkylated protein.
Claim 4
Dependent Claim
20 words
The process of claim 2, wherein the alkyl moiety of the carboxyalkylated protein has from 2 to 8 carbon atoms.
Claim 5
Dependent Claim
13 words
The process of claim 3, wherein the carboxyalkylated protein is a carboxyethylated protein.
Claim 6
Dependent Claim
29 words
The process of claim 3, wherein the carboxyalkylated protein is prepared by contacting a protein with acrylonitrile in the presence of an alkali and hydrolyzing the resulting reaction product.
Claim 7
Dependent Claim
29 words
The process of claim 3, wherein the carboxyalkylated protein is prepared by contacting a protein with an α,β-unsaturated aliphatic acid or a salt thereof under neutral or alkaline conditions.
Claim 8
Dependent Claim
32 words
The process of claim 3, wherein the carboxyalkylated protein is prepared by contacting a protein with an α,β-unsaturated aliphatic acid ester under neutral or alkaline conditions, and hydrolyzing the resulting reaction product.
Claim 9
Dependent Claim
13 words
The composition of claim 6, wherein the α,β-unsaturated aliphatic acid is acrylic acid.
Claim 10
Dependent Claim
42 words
The process of claim 1, wherein the protein is at least one material selected from the group consisting of a microorganism and a protein extracted therefrom, collagen, gelatin, glue, keratin, casein, egg albumin, soybean protein, wheat gluten, and a hydrolyzed product thereof.
Claim 11
Dependent Claim
13 words
The process of claim 1, wherein the carboxyalkylated protein is a carboxyethylated protein.
Claim 12
Dependent Claim
42 words
The process of claim 1, wherein the protein is at least one material selected from the group consisting of a microorganism and a protein extracted therefrom, collagen, gelatin, glue, keratin, casein, egg albumin, soybean protein, wheat gluten, and a hydrolyzed product thereof.
Claim 13
Dependent Claim
20 words
The process of claim 1, wherein the alkyl moiety of the carboxyalkylated protein has from 2 to 8 carbon atoms.
Claim 14
Dependent Claim
26 words
The process of claim 1, wherein said protein is in an amount of from 0.01 to 1% by weight based upon the weight of the gypsum.
Claim 15
Dependent Claim
38 words
The process of claim 13, wherein said carboxyalkylated protein is a carboxyethylated protein, and wherein said protein has a carboxyethyl group content of from 0.1 to 30% by weight based upon the total weight of the carboxyalkylated protein.
Claim 16
Dependent Claim
42 words
The process of claim 14, wherein the protein is at least one material selected from the group consisting of a microorganism and a protein extracted therefrom, collagin, gelatin, glue, keratin, casein, egg albumin, soybean protein, wheat gluten, and a hydrolyzed product thereof.
Claim 17
Dependent Claim
29 words
The process of claim 15, wherein the carboxyalkylated protein is prepared by contacting a protein with acrylonitrile in the presence of an alkali and hydrolyzing the resulting reaction product.
Claim 18
Dependent Claim
32 words
The process of claim 15, wherein the carboxyalkylated protein is prepared by contacting a protein with an α,β-unsaturated aliphatic acid ester under neutral or alkaline conditions, and hydrolyzing the resulting reaction product.
Claim 19
Dependent Claim
29 words
The process of claim 15, wherein the carboxyalkylated protein is prepared by contacting a protein with an α,β-unsaturated aliphatic acid or a salt thereof under neutral or alkaline conditions.
Claim 20
Dependent Claim
13 words
The process of claim 18, wherein the α,β-unsaturated aliphatic acid is acrylic acid.
References Cited (Backward Citations)
US3951735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |