US4584357A
Expired / Lapsed
US
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Latex treated cationic cellulose product and method for its preparation
Assignee: Weyerhaeuser Co
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Filing: 1984-06-20
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Granted: 1986-04-22
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Expires: 2004-06-20
Abstract
Abstract The invention is a fibrous cellulosic product, containing a uniformly dispersed polymeric material which has been deposited in an aqueous suspension from an anionic latex, and the method for its manufacture. Cellulosic fiber is first cationized by treating it in an aqueous suspension with the condensation product of epichlorohydrin and dimethylamine. Up to 30% of the dimethylamine may be replaced with a crosslinking agent which can be ammonia or an aliphatic diamine such as hexamethylene diamine. The cationized fiber, with or without small quantities of alum, will effectively retain a wide variety of anionic latices when treated in an aqueous environment.
Inventors
- 👤 Margot J. Harding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:47
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/21; D21H17/24; D21H17/25; D21H17/33; D21H11/00; D21H11/16; D21H11/20; D21H11/22; D21H17/34; D21H17/60; D21H17/63; D21H17/67; D21H17/68
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
118 words
A cellulose based product which comprises: a. a fibrous cationic cellulose prepared by the treatment under aqueous alkaline conditions of cellulose with a material from the group consisting of a reaction product of epichlorohydrin and dimethylamine, said reaction product further modified with a crosslinking agent, and mixtures thereof wherein the crosslinking agent, if present, is selected from the group consisting of ammonia and a primary aliphatic diamine of the type H 2 N--R--NH 2 where R is an alkylene radical of from 2 to 8 carbon atoms; and b. from 0.1 to 30%, on a dry weight basis, of a polymeric capable of being emulsified into an anionic dispersion, said polymer being uniformly dispersed on the fibrous cellulose.
Claim 2
Dependent Claim
118 words
A cellulose based product which comprises: a. a fibrous cationic cellulose prepared by the treatment under aqueous alkaline conditions of cellulose with a material from the group consisting of a reaction product of epichlorohydrin and dimethylamine, said reaction product further modified with a crosslinking agent, and mixtures thereof wherein the crosslinking agent, if present, is selected from the group consisting of ammonia and a primary aliphatic diamine of the type H 2 N--R--NH 2 where R is an alkylene radical of from 2 to 8 carbon atoms; and b. from 0.1 to 30%, on a dry weight basis, of a polymeric capable of being emulsified into an anionic dispersion, said polymer being uniformly dispersed on the fibrous cellulose.
Claim 3
Dependent Claim
23 words
The product of claim 1 in which the reaction product of epichlorohydrin and dimethylamine is prepared using essentially equimolar portions of the reactants.
Claim 4
Dependent Claim
20 words
The product of claim 2 in which up to 30 molar percent of the dimethylamine is replaced by hexamethylene diamine.
Claim 5
Dependent Claim
19 words
The product of claim 2 in which up to 30 molar percent of the dimethylamine is replaced by ammonia.
Claim 6
Dependent Claim
20 words
The product of claim 2 in which up to 30 molar percent of the dimethylamine is replaced by ethylene diamine.
Claim 7
Dependent Claim
29 words
The product of claim 1 in which the epichlorohydrin-dimethylamine reaction product is used in an amount in the range of 0.5-20 kg/t based on the dry weight of cellulose.
Claim 8
Dependent Claim
29 words
The product of claim 6 in which the epichlorohydrin-dimethylamine reaction product is used in an amount in the range of 1-10 kg/t based on the dry weight of cellulose.
Claim 9
Dependent Claim
43 words
The product of claim 1 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl chloride, polyvinyl acetate, acrylonitrile, polystyrene, styrene-butadiene, styrene-acrylonitrile, acrylonitrile-butadiene-styrene, acrylic, vinyl acrylic resins, and polyolefins, mixtures thereof, and block and graft copolymers thereof.
Claim 10
Dependent Claim
33 words
The product of claim 8 in which the polymer is selected from the group of crosslinking and noncrosslining types of polyvinyl acetate and acrylic resins, mixtures thereof, and block and graft copolymers thereof.
Claim 11
Dependent Claim
43 words
The product of claim 3 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl chloride, polyvinyl acetate, acrylonitrile, polystyrene, styrene-butadiene, styrene-acrylonitrile, acrylonitrile-butadiene-styrene, acrylic, vinyl acrylic resins, and polyolefins, mixtures thereof, and block and graft copolymers thereof.
Claim 12
Dependent Claim
33 words
The product of claim 10 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl acetate and acrylic resins, mixtures thereof, and block and graft copolymers thereof.
Claim 13
Independent Claim
126 words
A method for preparing a cellulose based product which comprises a. preparing a cationic cellulose by treating cellulose under aqueous alkaline conditions with a material from the group consisting of the reaction product of epichlorohydrin and dimethylamine, said condensate further modified by a crosslinking agent, and mixtures thereof wherein the crosslinking agent, if present, is selected from the group consisting of ammonia and a primary aliphatic diamine of the type H 2 N--R--NH 2 wherein R is an alkylene radical of from 2 to 8 carbon atoms; and b. further treating the cationized cellulose while in an aqueous suspension with an anionic polymer emulsion in an amount of from 0.1 to 30%, on a dry weight basis, whereby the polymer is uniformly deposited on the cellulose.
Claim 14
Independent Claim
126 words
A method for preparing a cellulose based product which comprises a. preparing a cationic cellulose by treating cellulose under aqueous alkaline conditions with a material from the group consisting of the reaction product of epichlorohydrin and dimethylamine, said condensate further modified by a crosslinking agent, and mixtures thereof wherein the crosslinking agent, if present, is selected from the group consisting of ammonia and a primary aliphatic diamine of the type H 2 N--R--NH 2 wherein R is an alkylene radical of from 2 to 8 carbon atoms; and b. further treating the cationized cellulose while in an aqueous suspension with an anionic polymer emulsion in an amount of from 0.1 to 30%, on a dry weight basis, whereby the polymer is uniformly deposited on the cellulose.
Claim 15
Dependent Claim
23 words
The method of claim 12 in which the cellulose is treated with the reaction product of essentially equimolar portions of epichlorohydrin and dimethylamine.
Claim 16
Dependent Claim
19 words
The method of claim 13 in which up to 30 molar percent of the dimethylamine is replaced by ammonia.
Claim 17
Dependent Claim
20 words
The method of claim 13 in which up to 30 molar percent of the dimethylamine is replaced by ethylene diamine.
Claim 18
Dependent Claim
20 words
The method of claim 13 in which up to 30 molar percent of the dimethylamine is replaced by hexamethylene diamine.
Claim 19
Dependent Claim
25 words
The method of claim 12 further comprising using the epichlorohydrin-dimethylamine reaction product in an amount of 0.5-30 kg/t based on the dry weight of cellulose.
Claim 20
Dependent Claim
25 words
The method of claim 17 further comprising using the epichlorohydrin-dimethylamine reaction product in an amount of 1-10 kg/t based on the dry weight of cellulose.
Claim 21
Dependent Claim
45 words
The method of claim 12 in which the polymer emulsion is selected from the group of crosslinking and noncrosslinking types of polyvinyl chloride, polyvinyl acetate, acrylonitrile, polystyrene, styrene butadiene, styrene-acrylonitrile, acrylonitrile-butadiene-syrene, acrylic, vinyl acrylic resins, and polyolefins, mixtures thereof, and block and graft copolymers thereof.
Claim 22
Dependent Claim
33 words
The method of claim 19 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl acetate and acrylic resins, mixtures thereof, and block and graft copolymers thereof.
Claim 23
Dependent Claim
43 words
The method of claim 16 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl chloride, polyvinyl acetate, acrylonitrile, polystyrene, styrene butadiene, styrene-acrylonitrile, acrylonitrile-butadiene-styrene, acrylic, vinyl acrylic resins, polyolefins, mixtures thereof, and block and graft copolymers thereof.
Claim 24
Dependent Claim
33 words
The method of claim 21 in which the polymer is selected from the group of crosslinking and noncrosslinking types of polyvinyl acetate and acrylic resins, mixtures thereof, and block and graft copolymers thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |