WO1991004361A1 - Retenteur de liquides aqueux encapsule, procede pour sa preparation - Google Patents
Retenteur de liquides aqueux encapsule, procede pour sa preparation Download PDFInfo
- Publication number
- WO1991004361A1 WO1991004361A1 PCT/FR1990/000652 FR9000652W WO9104361A1 WO 1991004361 A1 WO1991004361 A1 WO 1991004361A1 FR 9000652 W FR9000652 W FR 9000652W WO 9104361 A1 WO9104361 A1 WO 9104361A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- membrane
- container according
- crystalline material
- encapsulated
- retentor
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J13/00—Colloid chemistry, e.g. the production of colloidal materials or their solutions, not otherwise provided for; Making microcapsules or microballoons
- B01J13/02—Making microcapsules or microballoons
- B01J13/04—Making microcapsules or microballoons by physical processes, e.g. drying, spraying
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/22—Agents rendering paper porous, absorbent or bulky
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/50—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by form
- D21H21/52—Additives of definite length or shape
- D21H21/54—Additives of definite length or shape being spherical, e.g. microcapsules, beads
Definitions
- Encapsulated aqueous liquid container process for its preparation
- the present invention relates to an encapsulated aqueous liquid retentant. It also relates to a process for its preparation.
- the Applicant has, according to the invention, developed a membrane capable of protecting at least temporarily a reten ⁇ tor of aqueous liquids, in particular subjected to severe conditions of pH (extreme pH of 0 or 13, for example) and of temperature (around 70 ° C, for example).
- Said membrane remedies the degradation of said retentor and / or a premature action of absorption of water or physiological fluids by the latter.
- Said membrane also allows the release, at will, of said encapsulated retentor.
- aqueous liquids is generally meant all liquids containing at least about 50% of water and for example water, physiological liquids such as blood, urine, etc.
- aqueous liquid retentor in the present application any superabsorbent polymer.
- S.A.P. superabsor ⁇ bant polymer
- the S.A.P. can be used as is, dispersed in or attached to the finished product. In certain particular cases, their incorporation takes place advantageously during the preparation of said finished product.
- the macromolecules of SAP can be degraded.
- said SAPs degrade very quickly in an acidic or basic medium: in particular, they lose their retentive capacity. In an aqueous medium, they swell immediately.
- the Applicant therefore wished to resolve the problem of protection - at least temporarily - of said retentants of aqueous liquids: - protection against water, to avoid premature absorption; and or
- Premature swelling can occur during any process involving aqueous liquids.
- This is for example the case of the incorporation of S.A.P. in paper, for obtaining industrial or household wiping products with a high percentage of water absorption; said S.A.P. being introduced into the pulp which contains water and cellulose fibers.
- S.A.P. being introduced into the pulp which contains water and cellulose fibers.
- SAP protected according to the invention
- SAPs also proves to be judicious for the incorporation of said SAP in cellulose sponges, during the manufacturing process of said sponges. It is also possible to incorporate SAPs, protected according to the invention, in an aqueous printing ink, a coating formula or an aqueous impregnation formula to facilitate the drying and rapid gelation of the polymer in order to freeze the formula and d '' accelerate crosslinking.
- the Applicant proposes the encapsulation of particles of superabsorbent polymer (S.A.P.) by a specific membrane.
- composition of said membrane constitutes the key element of the present invention.
- the retentants of encapsulated aqueous liquids therefore consist of particles of super ⁇ absorbent polymer (S.A.P.) coated with a protective membrane, capable of being degraded or even eliminated; said membrane consisting essentially of a mixture of at least one film-forming polymer and at least one hydrophobic crystalline material.
- S.A.P. super ⁇ absorbent polymer
- said membrane materials are organosoluble compounds. Their solubility in organic solvents allows the implementation of particularly efficient techniques for coating according to the invention particles of superabsorbent polymer (SAP); techniques which will be specified below.
- SAP superabsorbent polymer
- the film-forming polymer involved in the composition of the membrane according to the invention can be chosen from polymers of natural origin, polymers of synthetic origin or mixtures thereof. It can advantageously be chosen from cellulosic derivatives such as ethylcelluloses. Acetophthalates or Cellulose acetobutyrates - or mixtures thereof.
- styrene (co) polymers it can advantageously be chosen from styrene (co) polymers.
- Vinylidene chloride (co) polymers ... or mixtures thereof.
- it can even consist of a mixture of at least one polymer of natural origin and at least one polymer of synthetic origin.
- the hydrophobic crystalline material involved in the composition of the membrane according to the invention is advantageously chosen from fatty acids, fatty acid derivatives (fatty acid amides or bistearamides, etc.). Microcrystalline waxes and their mixtures. It is possible in particular to use, for the purposes of the invention, behenic acid, stearic acid, stearamide, bistéara ide or erucamide. It is advantageous to choose, for the purposes of the invention, a "pure" crystalline material having a clear melting point. It is then always possible, in order to release the encapsulated superabsorbent polymer particle (S.A.P.), to raise the temperature of the medium in which it is located at least and possibly above said frank melting point.
- S.A.P. encapsulated superabsorbent polymer particle
- said membrane essentially consists of a mixture of a film-forming polymer, chosen from ethylcelluloses or polystyrene and a hydrophobic crystalline material such as, for example, acid. behenic or the steara ide.
- the two main constituents of the membrane according to the invention are advantageously used in the following weight proportions: approximately 10 to 90% of film-forming polymer for approximately 90 to 10% of hydrophobic crystalline material.
- a mixture which is particularly preferred, in particular when a polymer of natural origin occurs, comprises approximately 30% of said film-forming polymer and 70% of hydrophobic crystalline material.
- the membrane according to the invention may contain, in addition to its two main constituents, additives and in particular products intended to improve its wetting and / or its hydrophobicity and / or its adhesion to the particle of superabsorbent polymer (S.A.P.).
- mineral lamellar fillers such as mica to improve the hydrophobicity and the water tightness of said membrane.
- a particle of superabsorbent polymer (SAP) is coated, according to the invention, with a membrane consisting essentially of a mixture of approximately 30% by weight of ethylcellulose, cellulose acetophthalate or polystyrene and of approximately 70% by weight of behenic acid or stearamide.
- the encapsulated particles can also be subjected to certain additional treatments. Details will be given below on methods which make it possible to obtain
- Encapsulated aqueous liquids according to the invention.
- Aqueous liquids are successively surrounded by two membranes; these two membranes being of the type of the invention as described above (but not necessarily identical).
- the intervention of an overcoat, on the protective layer in contact with the aqueous retentor, can in particular be opportune to very effectively protect a particle of superabsorbent polymer (SAP) during successive passages in very different reaction media, from the point of view of their pH.
- SAP superabsorbent polymer
- This overlay is of the same nature as the first layer: it essentially consists of a mixture of at least one film-forming polymer and at least one hydrophobic crystalline material, said film-forming polymer and material crystalline being as defined above and generally occurring in the proportions indicated above.
- Said second layer consists, for example, of a mixture of polystyrene (film-forming polymer) and stearamide (hydrophobic crystalline material).
- a particle of superabsorbent polymer can be protected by a first membrane based on ethylcellulose or acetophthalate of cellulose and behenic acid or stearamide (advantageously involved in respective weight proportions of 30 and 70%); itself coated with a second membrane based on polystyrene and stearamide or behenic acid (advantageously operating in weight proportions of 30 and 70% respectively).
- a first membrane based on ethylcellulose or acetophthalate of cellulose and behenic acid or stearamide (advantageously involved in respective weight proportions of 30 and 70%); itself coated with a second membrane based on polystyrene and stearamide or behenic acid (advantageously operating in weight proportions of 30 and 70% respectively).
- a particle is particularly well protected.
- the second protective layer or second membrane - layer or outer membrane - aims in particular to protect the first - in contact with the superabsorbent polymer (S.A.P.) - from the first reaction medium.
- S.A.P. superabsorbent polymer
- said retentor can be encapsulated by spraying materials, called to constitute the successive member or members, said materials being dissolved in a suitable solvent.
- This process can in particular be implemented with organosoluble materials, in solution in an organic solvent, which does not swell the superabsorbent polymer (SAP) to be encapsulated.
- Common solvents such as alcohols, chlorinated solvents, alkanes ... or their mixtures can be used.
- This process is advantageously used to generate an encapsulation by lamination, in particular in a fluidized bed. Techniques such as those of the Wurster, Top Spray or tangential spraying methods can be used. These methods allow a successive coating of the superabsorbent polymer particle during the multiple passages thereof near the spray nozzle.
- the tightness of the coated particles obtained can still, in certain cases, be improved by a heat treatment at a temperature below the melting point of the hydrophobic (or annealed) crystalline material.
- Such a heat treatment can be carried out after coating with a single layer; or after the coating with a first layer and / or after the coating with a second layer.
- superabsorbent polymers of one or other origin are preferably chosen, insoluble in water.
- Such polymers brought into contact with water, form a gel, physical or chemical, also called a hydrogel, capable of absorbing large quantities of water in its macro-molecular network.
- Superabsorbent polymers (SA °.) Of natural origin, which can be used in the context of the present invention, are for example polymers whose macromolecular network is of polysaccharide type such as agar, agar, alginate, carboxy ethylcellulose, as described in particular in US Pat. No. 3,589,364, hydroxyethylcellulose, methylcellulose, gelled cellulose triacetate as described in particular in US-A-1,693,890 and US-A-3,846,404, polyacry- Lonitrile grafted starch as described in particular in US-A-3,935,099 and US-A-3,661,815 and starch grafted acrylic acid as described in Patent FR-A-2 305 452.
- polysaccharide type such as agar, agar, alginate, carboxy ethylcellulose, as described in particular in US Pat. No. 3,589,364, hydroxyethylcellulose, methylcellulose, gelled cellulose triacetate
- Superabsorbent polymers of synthetic origin, which can be used in the context of the present invention, are for example polymers whose macromolecular network is made of acrylic polymers; hydroxyethyl methacrylate polymers; crosslinked polyvinyl alcohol; poLyacrylamide; partially hydrolyzed polyvinyl acetate; hydroxyethyl acrylate; diethylene glycol mono-acrylate; diethylene glycol mono ⁇ methacryLate; 2-hydroxypropyl acrylate; 2-hydroxypropyl methacrylate; 3-hydroxypropyl acrylate; 3-hydroxypropyl methacrylate; dipropylene glycol monomethacrylate; vinylpyrrolidone; acrylamide; methacrylamide; N-propylacrylamide; N-isopropylmethacrylamide; N-methylacrylamide; N-2-hydroxyethylmethacrylamide; polyurethane hydrogels, formed from slightly cross-linked polymers of isocyanate-terminated prepolymers which are the
- S.A.P. superabsorbent polymers
- Superabsorbent polymers insoluble in water, are obtained by crosslinking of macromolecules and are in the form of flakes, powders, films, fibers, spheres or "pearls” ...
- SAP superabsorbent polymers
- use will preferably be made of products in powder form or in spherical form which is easier to encapsulate.
- the invention will advantageously be implemented with particles of superabsorbent polymer of spherical shape and the diameter of which is generally between 100 and 800 ⁇ m and preferably between 100 and 400 ⁇ m.
- the deposition of the membrane in a fluidized bed, as described above is advantageously carried out with retenters of spherical shape and of average size close to 100-200 ⁇ m or 200-315 ⁇ m or 300-400 ⁇ m.
- Examples 1 to 6 illustrate the e ⁇ capsulation according to the invention of retentants of aqueous liquids by a monolayer or bilayer.
- Example 1
- the products used for the preparation of retentants of aqueous liquids encapsulated according to the invention are the following:
- Ethyl cellulose product marketed by HERCULES under the reference EC N 100.
- Annealing or heat treatment of the coated particle was carried out in a temperature of 65 ° C. for 5 to 10 minutes (at the end of the coating operation).
- Example 2
- Example 1 Conditions identical to those of Example 1.
- the behenic acid is however replaced by the stearamide Unislip 1750 from the company UNICHEMA (it operates in the same proportions and conditions as the behenic acid).
- Example 3 The deposition conditions are identical to those of Example 1 but without annealing.
- the nature of the coating constituents varies.
- the cedex 4520 impact polystyrene from CDF Chimie is used as film-forming polymer and the Unislip 1750 stearamide from UNICHEMA as crystalline material.
- the thickness of the deposited membrane is 30 to 35 ⁇ m.
- Example 4 Conditions identical to those of exe pLe 3, however replacing stearamide with behenic acid (in the same proportions). Annealing is carried out at 65 ° C for approximately 10 minutes.
- EXAMPLE 5 The conditions are identical to those of Example 1 at p - -îr of a particle of S.A.P. from 300 to 400 ⁇ m, with, however, the recovery of the particle already coated with ethylcellulose and behenic acid in order to make a second deposit identical to that of example 3.
- the composition of the particle is then as follows:
- Example 6 Conditions identical to those of Example 5, however replacing the fusible material of the first layer, behenic acid, with stearamide. The coating thicknesses are identical.
- Table 1 below illustrates the protection provided to S.A.P. by the membranes of the invention.
- the tightness of the particles is evaluated on the equivalent of 1 g of SAP, by measuring the amount of water absorbed by the particle immersed in 1 l of distilled water for two hours at room temperature with stirring (300 trs / minute) after passage through media A, B and C defined below.
- the solution is filtered through a sieve and then weighed, the weight of water absorbed by one gram of S.A.P. is then obtained by deduction.
- the different media A, B and C are obtained by varying the concentrations of sulfuric acid or soda:
- a - sulfuric acid solution: pH 0 - 1 temperature 70 CT 15 min
- B - distilled water solution: pH 5 - 7 temperature 70 CT 15 min
- C - soda solution: pH 12 - 13 temperature 70 CT 15 min
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Epidemiology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- General Chemical & Material Sciences (AREA)
- Wood Science & Technology (AREA)
- Hematology (AREA)
- Medicinal Preparation (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8911924A FR2651688A1 (fr) | 1989-09-12 | 1989-09-12 | Retenteur de liquides aqueux encapsule, procede pour sa preparation. |
FR89/11924 | 1989-09-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1991004361A1 true WO1991004361A1 (fr) | 1991-04-04 |
Family
ID=9385373
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1990/000652 WO1991004361A1 (fr) | 1989-09-12 | 1990-09-12 | Retenteur de liquides aqueux encapsule, procede pour sa preparation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0491795A1 (fr) |
FR (1) | FR2651688A1 (fr) |
WO (1) | WO1991004361A1 (fr) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0602617A2 (fr) * | 1992-12-18 | 1994-06-22 | Hoechst Celanese Corporation | Structures superabsorbantes |
WO1995000183A1 (fr) * | 1993-06-21 | 1995-01-05 | Mölnlycke AB | Articles absorbants contenant un materiau superabsorbant a action retardee |
WO2002070125A1 (fr) * | 2001-03-03 | 2002-09-12 | Fluid Technologies Plc | Materiaux absorbants |
CN1981008B (zh) * | 2004-06-07 | 2010-06-02 | 巴斯福股份公司 | 超吸收性可印刷组合物 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA681635A (en) * | 1964-03-10 | Friedman Jack | Washing and bleaching composition | |
US3954493A (en) * | 1972-10-19 | 1976-05-04 | Avicon, Inc. | Regenerated cellulose sponge |
EP0171670A1 (fr) * | 1984-07-27 | 1986-02-19 | Ppg Industries, Inc. | Fibres flexibles traitées chimiquement et tissus enduits de celles-ci |
-
1989
- 1989-09-12 FR FR8911924A patent/FR2651688A1/fr active Pending
-
1990
- 1990-09-12 EP EP19900913832 patent/EP0491795A1/fr not_active Withdrawn
- 1990-09-12 WO PCT/FR1990/000652 patent/WO1991004361A1/fr not_active Application Discontinuation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA681635A (en) * | 1964-03-10 | Friedman Jack | Washing and bleaching composition | |
US3954493A (en) * | 1972-10-19 | 1976-05-04 | Avicon, Inc. | Regenerated cellulose sponge |
EP0171670A1 (fr) * | 1984-07-27 | 1986-02-19 | Ppg Industries, Inc. | Fibres flexibles traitées chimiquement et tissus enduits de celles-ci |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0602617A2 (fr) * | 1992-12-18 | 1994-06-22 | Hoechst Celanese Corporation | Structures superabsorbantes |
EP0602617A3 (fr) * | 1992-12-18 | 1994-06-29 | Hoechst Celanese Corporation | Structures superabsorbantes |
US5433994A (en) * | 1992-12-18 | 1995-07-18 | Mckinney; Betty J. | Superabsorbent structure |
WO1995000183A1 (fr) * | 1993-06-21 | 1995-01-05 | Mölnlycke AB | Articles absorbants contenant un materiau superabsorbant a action retardee |
AU677677B2 (en) * | 1993-06-21 | 1997-05-01 | Molnlycke Ab | Absorbent articles containing superabsorbent material which has a delayed activation time |
US5855571A (en) * | 1993-06-21 | 1999-01-05 | Molnlycke Ab | Absorbent articles containing superabsorbent material which has a delayed activation time |
WO2002070125A1 (fr) * | 2001-03-03 | 2002-09-12 | Fluid Technologies Plc | Materiaux absorbants |
CN1981008B (zh) * | 2004-06-07 | 2010-06-02 | 巴斯福股份公司 | 超吸收性可印刷组合物 |
Also Published As
Publication number | Publication date |
---|---|
EP0491795A1 (fr) | 1992-07-01 |
FR2651688A1 (fr) | 1991-03-15 |
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