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US4080358A
Expired / Lapsed
US
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Low-dusting, free-flowing acrylamide polymer composition
Assignee: Dow Chemical Co
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Filing: 1976-08-09
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Granted: 1978-03-21
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Expires: 1996-08-09
Abstract
Abstract A water-dispersible, low-dusting, free-flowing composition made of acrylamide polymer, an antidusting agent selected from lower aliphatic polyols and polyalkylene glycols of up to about 6000 molecular weight and a particulate free-flow aid is disclosed.
Inventors
- 👤 Karl L. Krumel
- 👤 Albert B. Savage
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:34
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/124; C08K; C08K3/00; C08K3/34; C08K3/36; C08K5/00; C08K5/04; C08K5/06; C08J2333/00; C08J2333/24; C08J2333/26; Y; Y10; Y10S; Y10S524/00; Y10S524/922
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A low-dusting, free-flowing composition comprising, in intimate mixture: Component A, a finely divided, water-soluble acrylamide polymer which is primarily of less than about 0.5 millimeter particle size; Component B, an antidusting agent selected from propylene oxide adducts of glycerol of about 500 to about 2000 average molecular weight, in the amount of about 0.1 to about 0.5 percent based on the weight of A; and Component C, a highly silicious particulate free-flow aid comprising particles of submicron up to about 10 microns particle size, in the amount of about 1 to about 80 weight percent, based on the weight of Component B, provided that at least about 0.005 percent by weight of Component C is present, based on the weight of Component A.
Claim 2
Dependent Claim
123 words
A low-dusting, free-flowing composition comprising, in intimate mixture: Component A, a finely divided, water-soluble acrylamide polymer which is primarily of less than about 0.5 millimeter particle size; Component B, an antidusting agent selected from propylene oxide adducts of glycerol of about 500 to about 2000 average molecular weight, in the amount of about 0.1 to about 0.5 percent based on the weight of A; and Component C, a highly silicious particulate free-flow aid comprising particles of submicron up to about 10 microns particle size, in the amount of about 1 to about 80 weight percent, based on the weight of Component B, provided that at least about 0.005 percent by weight of Component C is present, based on the weight of Component A.
Claim 3
Dependent Claim
21 words
A composition of claim 1 wherein Component A is a polyacrylamide of about 50,000 to about 10 million average molecular weight.
Claim 4
Dependent Claim
12 words
A composition of claim 1 wherein Component C primarily comprises amorphous silica.
Claim 5
Dependent Claim
24 words
A composition of claim 1 wherein Component B is present in the amount of about 0.25 percent based on the weight of Component A.
Claim 6
Dependent Claim
27 words
A composition of claim 1 wherein Component C is present in the amount of about 5 to about 40 percent based on the weight of Component B.
Claim 7
Dependent Claim
21 words
A composition of claim 1 wherein Component B is a propylene oxide adduct of glycerol of about 700 average molecular weight.
Claim 8
Dependent Claim
46 words
A composition of claim 1 wherein Component B is present in the amount of about 0.25 percent based on the weight of Component A and Component C is present in the amount of about 5 to about 40 percent based on the weight of Component B.
Claim 9
Dependent Claim
49 words
A composition of claim 7 wherein Component A is a water-soluble polyacrylamide that is about 30 percent hydrolyzed and which has about 6 million average molecular weight; Component B is a propylene oxide adduct of glycerol of about 700 average molecular weight; and Component C primarily comprises amorphous silica.
Claim 10
Dependent Claim
28 words
A composition of claim 1 wherein Component B is a propylene oxide adduct of glycerol of about 700 average molecular weight and Component C primarily comprises amorphous silica.
References Cited (Backward Citations)
US2882254A
Cited
US3839500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-20 | 1981-09-19 | 1982-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-20 | 1985-09-19 | 1986-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-20 | 1989-09-19 | 1990-03-21 | $7700.00 | Window Closed / Lapsed |