RU96110186A - MODIFIED POLYSACCHARIDES WITH IMPROVED ABSORPTION PROPERTIES AND METHOD FOR PRODUCING THEM - Google Patents

MODIFIED POLYSACCHARIDES WITH IMPROVED ABSORPTION PROPERTIES AND METHOD FOR PRODUCING THEM

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RU96110186A
RU96110186A RU96110186/04A RU96110186A RU96110186A RU 96110186 A RU96110186 A RU 96110186A RU 96110186/04 A RU96110186/04 A RU 96110186/04A RU 96110186 A RU96110186 A RU 96110186A RU 96110186 A RU96110186 A RU 96110186A
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water
polysaccharide
carboxyalkyl polysaccharide
carboxyalkyl
insoluble
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RU96110186/04A
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Russian (ru)
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RU2152403C1 (en
Inventor
Квин Джиан
Ричард Гросс Джеймс
Йоханнес Муи Вильям
Нинг Ксин
Зио Шроедер Вен
Сун Тонг
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Кимберли-Кларк Корпорейшн
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Priority claimed from US08/145,453 external-priority patent/US5550189A/en
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Publication of RU96110186A publication Critical patent/RU96110186A/en
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Claims (56)

1. Способ получения набухающего в воде, нерастворимого в воде карбоксиалкилполисахарида, включающий следующие стадии: приготовление гомогенной смеси, состоящей из водорастворимого карбоксиалкилполисахарида и воды, где карбоксиалкилполисахарид растворяется в воде; выделение указанного карбоксиалкилполисахарида из указанной смеси; термообработку указанного выделенного карбоксиалкилполисахарида при 200 - 250oС в течение 50 - 90 с; причем указанная термообработка приводит к эффективному сшиванию указанного карбоксиалкилполисахарида, и указанный карбоксиалкилполисахарид становится набухающим в воде и нерастворимым в воде, при этом набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 17 и сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение сут при 24oС и относительной влажности по крайней мере 30%.1. A method of obtaining a water-swellable, water-insoluble carboxyalkyl polysaccharide, comprising the steps of: preparing a homogeneous mixture consisting of a water-soluble carboxyalkyl polysaccharide and water, wherein the carboxyalkyl polysaccharide is soluble in water; isolating said carboxyalkyl polysaccharide from said mixture; heat treatment of the specified selected carboxyalkyl polysaccharide at 200 - 250 o C for 50 - 90 s; moreover, said heat treatment leads to efficient crosslinking of said carboxyalkyl polysaccharide, and said carboxyalkyl polysaccharide becomes water-swellable and insoluble in water, while water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 17 and 50% of the initial value of absorption capacity under load after aging for 24 hours at 24 o C and a relative humidity of at least 30%. 2. Способ п. 1, где карбоксиалкилполисахарид получают из полисахарида, выбранного из группы, состоящей целлюлозы, крахмала, гуара, каррагинана, агара, геллановой смолы, хитина, хитозана, и их смесей. 2. The method of claim 1, wherein the carboxyalkyl polysaccharide is prepared from a polysaccharide selected from the group consisting of cellulose, starch, guar, carrageenan, agar, gellan gum, chitin, chitosan, and mixtures thereof. 3. Способ по п.1, где карбоксиалкилполисахарид представляет собой карбоксиалкилцеллюлозу. 3. The method according to claim 1, where the carboxyalkyl polysaccharide is a carboxyalkyl cellulose. 4. Способ по п. 2, где карбоксиалкилполисахарид представляет собой карбоксиметилполисахарид. 4. The method of claim 2, wherein the carboxyalkyl polysaccharide is a carboxymethyl polysaccharide. 5. Способ по п. 4, где карбоксиметилполисахарид представляет собой карбоксиметилцеллюлозу. 5. The method of claim 4, wherein the carboxymethyl polysaccharide is carboxymethyl cellulose. 6. Способ по п. 1, где указанный карбоксиалкилполисахарид выделяют путем испарительной сушки. 6. The method of claim 1, wherein said carboxyalkyl polysaccharide is isolated by evaporative drying. 7. Способ по п. 1, где рН указанной смеси, содержащей указанный карбоксиалкилполисахарид и воду, находится в пределах от 5 до 9. 7. The method according to p. 1, where the pH of the specified mixture containing the specified carboxyalkyl polysaccharide and water, is in the range from 5 to 9. 8. Способ по п. 1, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 20. 8. The method according to claim 1, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 20. 9. Способ по п. 1, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 70% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут, при 24oС и относительной влажности по крайней мере 30%.9. The method of claim 1, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 70% of the initial absorption capacity under load after aging for 60 days, at 24 ° C. and at least 30% relative humidity. 10. Способ по п. 1, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности 100%.10. The method according to claim 1, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of 100%. 11. Способ получения набухающего в воде, нерастворимого в воде карбоксиалкилполисахарида, включающий следующие стадии: приготовление гомогенной смеси, состоящей в основном из водорастворимого карбоксиалкилполисахарида и воды, где указанная смесь имеет рН 4,0 - 7,5 и где растворимый карбоксиалкилполисахарид растворяется в воде; выделение указанного карбоксиалкилполисахарида при температуре выше 50oС в течение промежутка времени, эффективно для сшивания указанного карбоксиалкилполисахарида и превращения указанного карбоксиалкилполисахарида в набухающий в воде и нерастворимый в воде материал, так, чтобы набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имел начальную величину абсорбционной способности под нагрузкой по крайней мере около 17 и сохранял по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.11. A method of obtaining a water-swellable, water-insoluble carboxyalkyl polysaccharide, comprising the steps of: preparing a homogeneous mixture consisting mainly of a water-soluble carboxyalkyl polysaccharide and water, wherein said mixture has a pH of 4.0-7.5 and where soluble carboxyalkyl polysaccharide is soluble in water; isolating said carboxyalkyl polysaccharide at a temperature above 50 ° C. over a period of time is effective for crosslinking said carboxyalkyl polysaccharide and converting said carboxyalkyl polysaccharide to a water-swellable and water-insoluble material such that the water-swellable, water-insoluble carboxyalkyl-absorptic polysaccharide a load of at least about 17 and retained at least about 50% of the initial absorption capacity under load after st arena for 60 days at 24 o C and a relative humidity of at least 30%. 12. Способ по п.11, где карбоксиалкилполисахарид получают из полисахарида, выбранного из группы, состоящей из целлюлозы, крахмала, гуара, каррагинана, агара, геллановой смолы, хитина, хитозана и их смесей. 12. The method according to claim 11, where the carboxyalkyl polysaccharide is obtained from a polysaccharide selected from the group consisting of cellulose, starch, guar, carrageenan, agar, gellan gum, chitin, chitosan and mixtures thereof. 13. Способ по п.11, где смесь имеет рН 6,0 - 7,5. 13. The method according to claim 11, where the mixture has a pH of 6.0 to 7.5. 14. Способ по п. 11, где карбоксиалкилполисахарид представляет собой карбоксиметилполисахарид. 14. The method of claim 11, wherein the carboxyalkyl polysaccharide is a carboxymethyl polysaccharide. 15. Способ по п. 14, где карбоксиметилполисахарид представляет собой карбоксиметилцеллюлозу. 15. The method of claim 14, wherein the carboxymethyl polysaccharide is carboxymethyl cellulose. 16. Способ по п. 11, где указанный карбоксиалкилполисахарид выделяется путем испарительной сушки. 16. The method according to claim 11, wherein said carboxyalkyl polysaccharide is released by evaporative drying. 17. Способ по п. 11, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 20. 17. The method according to claim 11, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 20. 18. Способ по п. 11, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 70% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 23oС и относительной влажности по крайней мере 30%.18. The method of claim 11, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 70% of the initial absorption capacity under load after aging for 60 days at 23 ° C. and a relative humidity of at least 30%. 19. Способ по п.11, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 23oС и относительной влажности 100%.19. The method according to claim 11, where the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 23 ° C. and a relative humidity of 100%. 20. Способ по п. 11, где указанный карбоксиалкилполисахарид подвергают термообработке при 100 - 200oС в течение 1 - 600 мин.20. The method according to p. 11, where the specified carboxyalkyl polysaccharide is subjected to heat treatment at 100 - 200 o C for 1 - 600 minutes 21. Способ получения набухающего в воде, нерастворимого в воде карбоксиалкилполисахарида, включающий в основном следующие стадии: приготовление гомогенной смеси, состоящей в основном из водорастворимого карбоксиалкилполисахарида и воды, где водорастворимый карбоксиалкилполисахарид растворяется в воде, добавление к гомогенной смеси раствора, состоящего в основном из сшивающего агента, содержащего ион алюминия, растворенного в воде, выделение указанного карбоксиалкилполисахарида и указанного сшивающего агента из указанной смеси, при этом набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 17 и сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.21. A method of producing a water-swellable, water-insoluble carboxyalkyl polysaccharide, comprising essentially the following steps: preparing a homogeneous mixture consisting mainly of a water-soluble carboxyalkyl polysaccharide and water, where a water-soluble carboxyalkyl polysaccharide is dissolved in water, adding a solution to the homogeneous mixture from the main mixture an agent containing an aluminum ion dissolved in water, isolating said carboxyalkyl polysaccharide and said crosslinking agent from said mixture, this water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 17 and retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 o C and a relative humidity of at least at least 30%. 22. Способ по п. 21, где карбоксиалкилполисахарид получают из полисахарида, выбранного из группы, состоящей из целлюлозы, крахмала, гуара, каррагинана, агара, геллановой смолы, хитина, хитозана и их смесей. 22. The method according to p. 21, where the carboxyalkyl polysaccharide is obtained from a polysaccharide selected from the group consisting of cellulose, starch, guar, carrageenan, agar, gellan gum, chitin, chitosan and mixtures thereof. 23. Способ по п. 21, где карбоксиалкилполисахарид, представляет собой карбоксиалкилцеллюлозу. 23. The method of claim 21, wherein the carboxyalkyl polysaccharide is carboxyalkyl cellulose. 24. Способ по п. 21, где карбоксиалкилполисахарид представляет собой карбоксиметилполисахарид. 24. The method of claim 21, wherein the carboxyalkyl polysaccharide is a carboxymethyl polysaccharide. 25. Способ по п. 24, где карбоксиметилполисахаридом является карбоксиметилцеллюлоза. 25. The method of claim 24, wherein the carboxymethyl polysaccharide is carboxymethyl cellulose. 26. Способ по п.21, где указанный карбоксиалкилполисахарид и указанный сшивающий агент выделяют путем испарительной сушки. 26. The method according to item 21, where the specified carboxyalkyl polysaccharide and the specified crosslinking agent is isolated by evaporative drying. 27. Способ по п. 21, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой, равную по крайней мере 20. 27. The method of claim 21, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least 20. 28. Способ по п. 21, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 70% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.28. The method of claim 21, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 70% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of at least 30%. 29. Cпособ по п. 21, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности 100%.29. The method according to claim 21, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of 100%. 30. Способ получения набухающего в воде, нерастворимого в воде карбоксиалкилполисахарида, включающий в себя a) приготовление реакционной дисперсии, состоящей из растворителя и полисахарида, содержащего исходную кристаллическую структуру, b) добавление карбоксиалкилирующего реагента к реакционной дисперсии в условиях, эффективных для протекания реакции карбоксиалкилирующего реагента с полисахаридом, чтобы получить растворимый в воде, диспергируемый в воде карбоксиалкилполисахарид, с) выделение нерастворимого в воде, диспергируемого в воде карбоксиалкилполисахарида из реакционной дисперсии, d) приготовление смеси, состоящей из выделенного нерастворимого в воде, диспергируемого в воде карбоксиалкилполисахарида, и воды, и e) выделение карбоксиалкилполисахарида из смеси, при этом карбоксиалкилполисахарид содержит такое количество исходной кристаллической структуры полисахарида, которое эффективно, чтобы получить карбоксиалкилполисахарид, набухающий в воде и нерастворимый в воде, который имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 17 и сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.30. A method of producing a water-swellable, water-insoluble carboxyalkyl polysaccharide, comprising a) preparing a reaction dispersion consisting of a solvent and a polysaccharide containing an initial crystalline structure, b) adding a carboxyalkylating reagent to the reaction dispersion under conditions effective for the carboxyalkylating reagent to react with a polysaccharide to obtain a water-soluble, water-dispersible carboxyalkyl polysaccharide, c) isolation of a water-insoluble, dispersible in water a carboxyalkyl polysaccharide from the reaction dispersion; d) preparing a mixture consisting of isolated water-insoluble, water-dispersible carboxyalkyl polysaccharide and water, and e) isolating a carboxyalkyl polysaccharide from a mixture, wherein the carboxyalkyl polysaccharide contains an effective amount of a starting crystalline crystal a carboxyalkyl polysaccharide that swells in water and is insoluble in water, which has an initial absorption capacity under a load of at least m D about 17 and retains at least about 50% of the initial Absorbency Under Load after aging for 60 days at 24 o C and a relative humidity of at least 30%. 31. Способ по п. 30, где карбоксиалкилполисахарид получают из полисахарида, выбранного из группы, состоящей из целлюлозы, хитина и их смесей. 31. The method according to p. 30, where the carboxyalkyl polysaccharide is obtained from a polysaccharide selected from the group consisting of cellulose, chitin and mixtures thereof. 32. Способ по п.30, где карбоксиалкилполисахарид представляет собой карбоксиалкилцеллюлозу. 32. The method of claim 30, wherein the carboxyalkyl polysaccharide is carboxyalkyl cellulose. 33. Способ по п. 30, где карбоксиалкилполисахарид представляет собой карбоксиметилполисахарид. 33. The method of claim 30, wherein the carboxyalkyl polysaccharide is a carboxymethyl polysaccharide. 34. Способ по п. 33, где карбоксиметилполисахарид представляет собой карбоксиметилцеллюлозу. 34. The method of claim 33, wherein the carboxymethyl polysaccharide is carboxymethyl cellulose. 35. Способ по п. 30, где указанный карбоксиалкилполисахарид выделяется из смеси путем испарительной сушки. 35. The method according to p. 30, where the specified carboxyalkyl polysaccharide is separated from the mixture by evaporative drying. 36. Способ по п. 30, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 20. 36. The method of claim 30, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 20. 37. Способ по п.30, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 70% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.37. The method according to claim 30, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 70% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of at least 30%. 38 Способ по п. 30, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности 100%.38 The method of claim 30, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and 100% relative humidity. 39. Способ по п.30, где в качестве щелочи для получения карбоксиалкилполисахарида используется гидроксид калия. 39. The method of claim 30, wherein potassium hydroxide is used as the alkali to produce the carboxyalkyl polysaccharide. 40. Способ по п. 30, отличающийся тем, что для получения карбоксиалкилполисахарида используется отношение щелочи к карбоксиалкилирующему реагенту меньше стехиометрического соотношения. 40. The method according to p. 30, wherein the ratio of alkali to carboxyalkylating reagent is less than the stoichiometric ratio to obtain a carboxyalkyl polysaccharide. 41. Способ по п. 40, где отношение щелочи к карбоксиалкилирующему реагенту меньше, чем 1:2. 41. The method according to p. 40, where the ratio of alkali to carboxyalkylating reagent is less than 1: 2. 42. Способ по п. 30, где в реакции молярное отношение карбоксиалкилирующего реагента к полисахариду меньше, чем 1:1. 42. The method according to p. 30, where in the reaction the molar ratio of carboxyalkylating reagent to polysaccharide is less than 1: 1. 43. Способ по п. 42, где карбоксиалкилирующий реагент представляет собой хлоруксусную кислоту, и полисахарид представляет собой целлюлозу. 43. The method of claim 42, wherein the carboxyalkylating reagent is chloroacetic acid and the polysaccharide is cellulose. 44. Способ получения набухающего в воде, нерастворимого в воде карбоксиалкилполисахарида, включающий в себя a) приготовление смеси, состоящей из нерастворимого в воде, диспергируемого в воде карбоксиалкилполисахарида и воды, и b) выделение карбоксиалкилполисахарида из смеси, при этом карбоксиалкилполисахарид получают из полисахарида, содержащего исходную кристаллическую структуру, и карбоксиалкилполисахарид содержит такое количество исходной кристаллической структуры полисахарида, которое, как можно полагать, эффективно для получения карбоксиалкилполисахарида, набухающего в воде и нерастворимого в воде, который имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 17 и сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.44. A process for preparing a water-swellable, water-insoluble carboxyalkyl polysaccharide, comprising a) preparing a mixture of water-insoluble, water-dispersible carboxyalkyl polysaccharide and water, and b) isolating a carboxyalkyl polysaccharide from the mixture, wherein carboxychacaride alkyl the initial crystalline structure, and the carboxyalkyl polysaccharide contains such an amount of the initial crystalline structure of the polysaccharide that is believed to be effective in obtaining I am a carboxyalkyl polysaccharide that swells in water and is insoluble in water, which has an initial absorption capacity under load of at least about 17 and retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 ° C and relative humidity of at least 30%. 45. Способ по п. 44, где карбоксиалкилполисахарид получают из полисахарида, выбранного из группы, состоящей из целлюлозы, хитина и их смесей. 45. The method of claim 44, wherein the carboxyalkyl polysaccharide is prepared from a polysaccharide selected from the group consisting of cellulose, chitin, and mixtures thereof. 46. Способ по п. 44, где карбоксиалкилполисахарид представляет собой карбоксиалкилцеллюлозу. 46. The method of claim 44, wherein the carboxyalkyl polysaccharide is carboxyalkyl cellulose. 47. Способ по п. 44, где карбоксиалкилполисахарид представляет собой карбоксиметилполисахарид. 47. The method of claim 44, wherein the carboxyalkyl polysaccharide is a carboxymethyl polysaccharide. 48. Способ по п. 47, где карбоксиметилполисахарид представляет собой карбоксиметилцеллюлозу. 48. The method of claim 47, wherein the carboxymethyl polysaccharide is carboxymethyl cellulose. 49. Способ по п. 48, где указанный карбоксиалкилполисахарид выделяет из смеси путем испарительной сушки. 49. The method of claim 48, wherein said carboxyalkyl polysaccharide is isolated from the mixture by evaporative drying. 50. Способ по п. 44, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид имеет начальную величину абсорбционной способности под нагрузкой по крайней мере около 20. 50. The method of claim 44, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide has an initial absorption capacity under load of at least about 20. 51. Способ по п. 44, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 70% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности по крайней мере 30%.51. The method according to claim 44, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 70% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of at least 30%. 52. Способ по п. 44, где набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид сохраняет по крайней мере около 50% начальной величины абсорбционной способности под нагрузкой после старения в течение 60 сут при 24oС и относительной влажности 100%.52. The method of claim 44, wherein the water-swellable, water-insoluble carboxyalkyl polysaccharide retains at least about 50% of the initial absorption capacity under load after aging for 60 days at 24 ° C. and a relative humidity of 100%. 53. Набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид, полученный по способу, описанному в п. 1. 53. Water-swellable, water-insoluble carboxyalkyl polysaccharide obtained by the method described in paragraph 1. 54. Набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид, полученный по способу, описанному в п. 11. 54. Water-swellable, water-insoluble carboxyalkyl polysaccharide obtained by the method described in paragraph 11. 55. Набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид, полученный по способу, описанному в п. 21. 55. Water-swellable, water-insoluble carboxyalkyl polysaccharide obtained by the method described in paragraph 21. 56. Набухающий в воде, нерастворимый в воде карбоксиалкилполисахарид, полученный по способу, описанному в п. 30. 56. Water-swellable, water-insoluble carboxyalkyl polysaccharide obtained by the method described in paragraph 30.
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