Patent EP0011303A2 successfully refreshed from Google Patents.
EP0011303A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Starch-sized paper
Assignee: Unilever Bestfoods North America
•
Filing: 1979-11-16
•
Granted: —
•
Expires: 1999-11-16
Abstract
Abstract This invention discloses a process for the manufacture of paper having retained therein high levels of starch wherein such starch is a specially treated, cooked, cross-linked starch which is added with a poly-electrolyte at the wet end of the paper manufacturing process or sprayed on the web in the paper-forming process. The invention also relates to a novel wet-end paper additive composition which includes the specially treated, cooked, cross-linked starch and a polyelectrolyte and the improved paper produced therefrom.
Inventors
- 👤 Howard L. Arons
- 👤 Howard P. Francis
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:10
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/28; D21H17/33; D21H17/34; D21H17/37; D21H17/375
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
64 words
An improved process for the manufacture of paper which comprises the steps of: (a) adding an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g to an aqueous suspension of cellulosic pulp; (b) adding a polyelectrolyte to the starch-pulp mixture; and (c) forming paper from said mixture of pulp, starch and polyelectrolyte.
Claim 2
Dependent Claim
64 words
An improved process for the manufacture of paper which comprises the steps of: (a) adding an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g to an aqueous suspension of cellulosic pulp; (b) adding a polyelectrolyte to the starch-pulp mixture; and (c) forming paper from said mixture of pulp, starch and polyelectrolyte.
Claim 3
Dependent Claim
27 words
The process of claim 1 wherein said cross-linked starch comprises from about 1% to about 20% by weight of the starch-pulp mixture on a dry solids basis.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein at least about 80% by weight of the cross-linked starch added to the pulp is retained in the paper.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein said polyelectrolyte comprises from about 0.01% to about 1% by weight of said pulp, starch and polyelectrolyte mixture on a dry solids basis.
Claim 6
Dependent Claim
16 words
The process of claim 1 wherein said polyelectrolyte comprises an anionic or cationic acrylamide based copolymer.
Claim 7
Dependent Claim
33 words
A wet-end paper additive composition which comprises: (a) an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume from about 4 ml/g to about 25 ml/g; and (b) a polyelectrolyte.
Claim 8
Dependent Claim
33 words
A wet-end paper additive composition which comprises: (a) an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume from about 4 ml/g to about 25 ml/g; and (b) a polyelectrolyte.
Claim 9
Dependent Claim
17 words
The composition of claim 10 wherein the poly- electrolyte comprises an anionic or cationic acrylamide based copolymer.
Claim 10
Dependent Claim
31 words
A paper of improved surface properties which comprises cellulosic fiber, a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g and a polyelectrolyte.
Claim 11
Dependent Claim
31 words
A paper of improved surface properties which comprises cellulosic fiber, a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g and a polyelectrolyte.
Claim 12
Dependent Claim
45 words
An improved process for the manufacture of paper which comprises spraying an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g onto the wet web in the paper-forming process and drying such web.
Claim 13
Dependent Claim
45 words
An improved process for the manufacture of paper which comprises spraying an aqueous suspension of a cooked, cross-linked starch having a cooked swollen volume of from about 4 ml/g to about 25 ml/g onto the wet web in the paper-forming process and drying such web.
Claim 14
Dependent Claim
30 words
The process of claim 9 wherein the amount of cooked, cross-linked starch added to the wet web is about 2% by weight of the dry basis weight of the furnish.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.