Patent US4552940A successfully refreshed from Google Patents.
US4552940A
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Styrene viscosity modifier of grafted starch polymer solutions
Assignee: Akzo NV
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Filing: 1984-09-06
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Granted: 1985-11-12
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Expires: 2004-09-06
Abstract
Abstract A grafted starch polymer solution having a lower viscosity through the incorporation of styrene into said grafted starch polymer.
Inventors
- 👤 Donald N. Van Eenam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:28
CPC Classifications
C; C08; C08F; C08F251/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24124; Y10T428/24355; Y10T428/24372; Y10T428/24405
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
63 words
A grafted starch polymer comprising from about 5 weight percent to about 95 weight percent of a starch substrate; from about 95 to about 5 weight percent of vinyl polymer segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of a solution of said graft polymer.
Claim 2
Dependent Claim
63 words
A grafted starch polymer comprising from about 5 weight percent to about 95 weight percent of a starch substrate; from about 95 to about 5 weight percent of vinyl polymer segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of a solution of said graft polymer.
Claim 3
Dependent Claim
15 words
The polymer of claim 1 wherein said grafted starch polymer is in an aqueous solution.
Claim 4
Dependent Claim
21 words
The polymer of claim 2 wherein said polymer in said aqueous solution ranges from between about 25 and about 30% solids.
Claim 5
Dependent Claim
22 words
The polymer of claim 1 wherein said styrene is from about 0.1 to about 10 weight percent of the grafted starch polymer.
Claim 6
Dependent Claim
22 words
The polymer of claim 4 wherein said styrene is from about 0.5 to about 1.5 weight percent of the grafted starch polymer.
Claim 7
Dependent Claim
13 words
The polymer of claim 5 wherein starch substrate is a nonenzyme modified starch.
Claim 8
Dependent Claim
16 words
The polymer of claim 6 wherein said nonenzyme modified starch is a hydroxyalkylated or carboxyalkylated starch.
Claim 9
Dependent Claim
22 words
The polymer of claim 7 wherein said polymer is in an aqueous solution ranging between about 25 to 30 percent weight solids.
Claim 10
Dependent Claim
67 words
An aqueous solution comprising about 25 to about 30 percent solids of a grafted starch polymer comprising about 5 to about 95 weight percent of a starch substrate; about 95 to about 5 weight percent of vinyl polymeric segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of said solution.
Claim 11
Dependent Claim
67 words
An aqueous solution comprising about 25 to about 30 percent solids of a grafted starch polymer comprising about 5 to about 95 weight percent of a starch substrate; about 95 to about 5 weight percent of vinyl polymeric segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of said solution.
Claim 12
Dependent Claim
24 words
A solution of claim 8 wherein said styrene ranges from about 0.1 weight percent to about 10 weight percent of the grafted starch polymer.
Claim 13
Dependent Claim
22 words
A solution of claim 9 wherein said styrene ranges from about 0.5 to about 1.5 weight percent of the grafted starch polymer.
Claim 14
Dependent Claim
18 words
A solution of claim 9 having a viscosity within the range of about 1000 to about 8000 centipoise.
Claim 15
Dependent Claim
77 words
A fibrous substrate having been treated with a solution comprised of between about 25 and about 30 percent solids of a grafted starch polymer comprised of from about 5 to about 95 weight percent of a starch substrate; about 95 to about 5 weight percent of vinyl polymeric segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of said solution.
Claim 16
Dependent Claim
77 words
A fibrous substrate having been treated with a solution comprised of between about 25 and about 30 percent solids of a grafted starch polymer comprised of from about 5 to about 95 weight percent of a starch substrate; about 95 to about 5 weight percent of vinyl polymeric segments comprising at least 50% by weight of said vinyl polymeric segments acrylamide monomer residue; and a sufficient amount of styrene to significantly reduce the viscosity of said solution.
Claim 17
Dependent Claim
11 words
A fibrous substrate of claim 13 wherein said solution is aqueous.
Claim 18
Dependent Claim
24 words
A fibrous substrate of claim 14 wherein said aqueous solution has a viscosity within a range of between about 1000 and about 8000 centipoise.
Claim 19
Dependent Claim
25 words
A fibrous substrate of claim 15 wherein said styrene ranges from about 0.5 weight percent and about 10 weight percent of the grafted starch polymer.
Claim 20
Dependent Claim
24 words
A fibrous substrate of claim 15 wherein said styrene ranges from between about 0.5 and about 1.5 weight percent of said grafted starch polymer.
References Cited (Backward Citations)
US4005040A
Cited
US4375535A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |