EP0147380A2
Expired / Lapsed
EP
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Functionalized polyacrylamide grafted starch polymer wet strength additives
Assignee: Akzo NV
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Filing: 1984-12-14
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Granted: —
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Expires: 2004-12-14
Abstract
Abstract A functionalised polyacrylamide grafted starch useful as a paper wet strength additive wherein at least 5 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide and comprising substituents derived from one or more materials containing two or more aldehyde units, e.g. glyoxal.
Inventors
- 👤 Donald Neil Van Eenam
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 19:26
CPC Classifications
D; D21; D21H; D21H3/00; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; C; C08; C08F; C08F251/00; C08F8/00; C08F8/28
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
49 words
A substituted polyacrylamide grafted starch polymer useful as an essentially water soluble wet strength paper additive, (i) wherein at least about 5 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide and (ii) comprising substituents derived from one or more materials containing two or more aldehyde units.
Claim 2
Dependent Claim
49 words
A substituted polyacrylamide grafted starch polymer useful as an essentially water soluble wet strength paper additive, (i) wherein at least about 5 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide and (ii) comprising substituents derived from one or more materials containing two or more aldehyde units.
Claim 3
Dependent Claim
25 words
A substituted polyacrylamide grafted starch polymer of Claim 1, wherein from 5 to 90 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide.
Claim 4
Dependent Claim
43 words
A substituted polyacrylamide grafted starch polymer in accordance with either Claim 1 or Claim 2, wherein the substituents (ii) are derived from materials selected from glyoxal, gluteraldehyde, cyanuric acid aldehydes, hexaglyoxalolmelamine, melamine/aldehyde ccndensates containing two or more reactive aldehyde groups, and combinations thereof.
Claim 5
Dependent Claim
16 words
A substituted polyacrylamide grafted starch polymer of Claim 3, wherein the substituents are derived from glyoxal.
Claim 6
Dependent Claim
69 words
A substituted polymer according to either Claim 1 or Claim 2, that is a glyoxalated polyacrylamide grafted starch polymer wherein (i . ) from 5 to 15 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide and, (ii) the glyoxal derived substituents are provided in an effective amount to provide wet strength of at least 200 g/cm to paper prepared using the glyoxalated polyacrylamide grafted starch polymer.
Claim 7
Dependent Claim
67 words
A substituted polymer according to either Claim 1 or Claim 2, that is a glyoxalated polyacrylamide grafted starch polymer wherein (i) from 15 to 70 weight percent of the corresponding polyacrylamide grafted starch polymer is polyacrylamide, and (ii) the glyoxal derived substituents are provided in an effective amount to provide wet strength of at least 200 g/cm to paper prepared using the glyoxalated polyacrylamide grafted starch polymer.
Claim 8
Dependent Claim
36 words
A polymer of any of the preceding claims, wherein the weight ratio on a solids basis of the corresponding polyacrylamide grafted starch polymer to substituents derived from materials containing aldehyde units is from 1:1 to 20:1.
Claim 9
Dependent Claim
14 words
A polymer of Claim 7, wherein the weight ratio is from 5:1 to 20:1.
Claim 10
Dependent Claim
25 words
A polymer of any of the preceding claims, wherein the starch from which the functionalised polyacrylamide grafted starch polymer is prepared is a degraded starch.
Claim 11
Dependent Claim
32 words
A polymer of Claim 9, wherein the starch from which the function used polyacrylamide grafted starch polymer is prepared is a degraded starch having a Brookfield viscosity of less than G.03 Pa.s.
Claim 12
Dependent Claim
18 words
A polymer of either Claim 9 or Claim 10, wherein the degraded starch is an enzyme converted starch.
Claim 13
Dependent Claim
19 words
A polymer of any of the preceding claims, wherein the polyacrylamide has a molecular weight of at least 350.
Claim 14
Dependent Claim
14 words
Paper comprising as wet-strength additive a polymer according to any of the preceding claims.
Claim 15
Dependent Claim
13 words
Paper according to Claim 13, having a wet strength at least 200 g/cm.
References Cited (Backward Citations)
No citation records indexed.
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