CA1064635A
Expired / Lapsed
CA
⏱️ 0.0 years remaining
Cellulose graft copolymer and method
Assignee: Personal Products Co
•
Filing: 1975-04-01
•
Granted: 1979-10-16
•
Expires: 1995-04-01
Abstract
Abstract Abstract of the Disclosure A backbone of natural or regenerated cellu-lose in fibrous form which has side chains of polymer moieties grafted thereto (cellulose graft copolymer) provides a novel, highly water-absorbent, soft, non-flammable, fibrous material useful for a variety of water or aqueous fluid-absorbent products particularly body fluid absorbent dressings such as diapers, sanitary napkins, tampons, surgical sponges, and the like. The polymer side chains are made up of ionic and non-ionic polymer moieties and, on a weight basis, may amount to from about 10% to about 90% of the cellulose graft copolymer. The ionic polymer moieties comprise from about 10% to about 80% by weight of the cellulose graft copolymer, and the non-ionic polymer moieties comprise from about 0.5% to about 60% by weight of the cellulose graft copolymer.
Inventors
- 👤 Robert F. Schwenker (Jr.)
- 👤 Pronoy K. Chatterjee
Bibliographic Details
Application Number
—
Jurisdiction
CA
Data Source
google_patents
Last Synchronized
2026-11-08 12:17
CPC Classifications
—
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
116 words
A cellulose graft copolymer in fibrous form, having a backbone of cellulose and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constitu-ting from about 10.5 to about 90% by weight of the total weight of the cellulose graft copolymer, some of said side chain poly-mer moieties being ionic polymer moieties and comprising from about 10% to about 80% by weight of the total weight of the cell-ulose graft copolymer, and the other of said side chain polymer moieties being non-ionic polymer moieties and comprising from about 0.5% to about 60% by weight of the total weight of the cellulose graft copolymer.
Claim 2
Dependent Claim
116 words
A cellulose graft copolymer in fibrous form, having a backbone of cellulose and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constitu-ting from about 10.5 to about 90% by weight of the total weight of the cellulose graft copolymer, some of said side chain poly-mer moieties being ionic polymer moieties and comprising from about 10% to about 80% by weight of the total weight of the cell-ulose graft copolymer, and the other of said side chain polymer moieties being non-ionic polymer moieties and comprising from about 0.5% to about 60% by weight of the total weight of the cellulose graft copolymer.
Claim 3
Dependent Claim
15 words
A cellulose graft copolymer as in claim 1 wherein said cellulose is a natural cellulose.
Claim 4
Dependent Claim
14 words
A cellulose graft copolymer as in claim 1 wherein said cellulose is regenerated cellulose.
Claim 5
Dependent Claim
75 words
A cellulose graft copolymer as in claim 1 wherein said polymer moieties constitute from about 60% to about 80% by weight of the total weight of the cellulose graft copolymer, said ionic polymer moieties comprising from about 20% to about 70% by weight of the total weight of the cellulose graft copolymer, and said non-ionic polymer moieties comprise from about 1% to about 60% by weight of the total weight of the cellulose graft copolymer.
Claim 6
Dependent Claim
113 words
A cellulose graft copolymer in fibrous form, having a backbone of wood pulp and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constituting from about 57% to about 67% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being sodium poly(acrylate) moieties and comprising from about 37% to about 42% by weight of the total weight of the cellulose graft copolymer and the other of said side chain polymer moieties being poly(methyl methacrylate) moieties and comprising from about 20% to about 25% by weight of the cellulose graft copolymer.
Claim 7
Dependent Claim
113 words
A cellulose graft copolymer in fibrous form, having a backbone of wood pulp and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constituting from about 57% to about 67% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being sodium poly(acrylate) moieties and comprising from about 37% to about 42% by weight of the total weight of the cellulose graft copolymer and the other of said side chain polymer moieties being poly(methyl methacrylate) moieties and comprising from about 20% to about 25% by weight of the cellulose graft copolymer.
Claim 8
Dependent Claim
119 words
A cellulose graft copolymer in fibrous form, having a backbone of a wood pulp and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constituting from about 75% to about 85% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being sodium poly(acrylate) moieties and com-prising from about 28% to about 33% by weight of the total weight of the cellulose graft copolymer and the other of said side chain polymer moieties being poly (ethyl acrylate) moieties and comprising from about 47% to about 52% by weight of the total weight of the cellulose graft copolymer.
Claim 9
Dependent Claim
119 words
A cellulose graft copolymer in fibrous form, having a backbone of a wood pulp and side chains of polymer moieties grafted thereto, said polymer moieties being selected from the class consisting of ionic and non-ionic polymer moieties and constituting from about 75% to about 85% by weight of the total weight of the cellulose graft copolymer, some of said side chain polymer moieties being sodium poly(acrylate) moieties and com-prising from about 28% to about 33% by weight of the total weight of the cellulose graft copolymer and the other of said side chain polymer moieties being poly (ethyl acrylate) moieties and comprising from about 47% to about 52% by weight of the total weight of the cellulose graft copolymer.
Claim 10
Dependent Claim
16 words
An absorbent dressing material comprising the cellulose graft copolymer of claim 5 and untreated cellulose fibers.
Claim 11
Dependent Claim
15 words
A tampon comprising the cellulose graft of copolymer of claim 5 and untreated cellulose fibers.
Claim 12
Dependent Claim
16 words
An absorbent dressing material comprising the cellulose graft copolymer of claim 6 and untreated cellulose fibers.
Claim 13
Dependent Claim
14 words
A tampon comprising the cellulose graft copolymer of claim 6 and untreated cellulose fibers.
Claim 14
Independent Claim
190 words
The method for making a cellulose graft copolymer in fibrous form which comprises copolymerizing a cellulose selected from the class consisting of natural and regenerated cellulose fibers, a monomer which is hydrolyzable after copolymerization to provide ionic polymer moieties, and a non-ionic, at least partially non-hydrolyzable monomer to form a cellulose graft copolymer having a cellulose backbone with copolymer side chains grafted thereto, said chains comprising from 10.5 to 90% by weight of said graft copolymer, which copolymer side chains are made up of hydrolyzable polymer moieties comprising from 10 to about 80% by weight of said graft copolymer and non-ionic, non-hydrolyzable polymer moieties comprising from 0.5 to about 60% by weight of said graft copolymer, and subjecting said cellu-lose graft copolymer to hydrolysis, by refluxing in a solution of from 1 to 50% by weight of a strong base, to hydrolyze the hydrolyzable polymer moieties on said cellulose graft copolymer to convert the same into ionic polymer moieties, thereby provi-ding a cellulose graft copolymer having a cellulose backbone with copolymer side chains grafted thereto, which copolymer side chains are made up of ionic polymer moieties and non-ionic polymer moieties.
Claim 15
Independent Claim
190 words
The method for making a cellulose graft copolymer in fibrous form which comprises copolymerizing a cellulose selected from the class consisting of natural and regenerated cellulose fibers, a monomer which is hydrolyzable after copolymerization to provide ionic polymer moieties, and a non-ionic, at least partially non-hydrolyzable monomer to form a cellulose graft copolymer having a cellulose backbone with copolymer side chains grafted thereto, said chains comprising from 10.5 to 90% by weight of said graft copolymer, which copolymer side chains are made up of hydrolyzable polymer moieties comprising from 10 to about 80% by weight of said graft copolymer and non-ionic, non-hydrolyzable polymer moieties comprising from 0.5 to about 60% by weight of said graft copolymer, and subjecting said cellu-lose graft copolymer to hydrolysis, by refluxing in a solution of from 1 to 50% by weight of a strong base, to hydrolyze the hydrolyzable polymer moieties on said cellulose graft copolymer to convert the same into ionic polymer moieties, thereby provi-ding a cellulose graft copolymer having a cellulose backbone with copolymer side chains grafted thereto, which copolymer side chains are made up of ionic polymer moieties and non-ionic polymer moieties.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.