Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
  • B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
  • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
  • C08B37/0036—Galactans; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
  • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
  • C08B37/0036—Galactans; Derivatives thereof
  • C08B37/0039—Agar; Agarose, i.e. D-galactose, 3,6-anhydro-D-galactose, methylated, sulfated, e.g. from the red algae Gelidium and Gracilaria; Agaropectin; Derivatives thereof, e.g. Sepharose, i.e. crosslinked agarose
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
  • C08B37/0006—Homoglycans, i.e. polysaccharides having a main chain consisting of one single sugar, e.g. colominic acid
  • C08B37/0036—Galactans; Derivatives thereof
  • C08B37/0042—Carragenan or carragen, i.e. D-galactose and 3,6-anhydro-D-galactose, both partially sulfated, e.g. from red algae Chondrus crispus or Gigantia stellata; kappa-Carragenan; iota-Carragenan; lambda-Carragenan; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
  • C08B37/00—Preparation of polysaccharides not provided for in groups C08B1/00 - C08B35/00; Derivatives thereof
  • C08B37/006—Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
  • C08B37/0084—Guluromannuronans, e.g. alginic acid, i.e. D-mannuronic acid and D-guluronic acid units linked with alternating alpha- and beta-1,4-glycosidic bonds; Derivatives thereof, e.g. alginates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
  • C08F251/00—Macromolecular compounds obtained by polymerising monomers on to polysaccharides or derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0016—Plasticisers
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K5/00—Use of organic ingredients
  • C08K5/04—Oxygen-containing compounds
  • C08K5/05—Alcohols; Metal alcoholates
  • C08K5/053—Polyhydroxylic alcohols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
  • C08L5/04—Alginic acid; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L5/00—Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00
  • C08L5/12—Agar or agar-agar, i.e. mixture of agarose and agaropectin; Derivatives thereof
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2005/00—Use of polysaccharides or derivatives as moulding material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/06—Rods, e.g. connecting rods, rails, stakes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2201/00—Properties
  • C08L2201/06—Biodegradable

Definitions

• the present invention relates to biodegradable hydrophobic composite materials and process for the preparation thereof
• the present invention relates to a process for the preparation of controlled/completely hydrophobic biodegradable composites that can be used for varied applications including seaweed cultivation in the open sea.
• the prepared composites can be sterilised in water without solubilisation, are flexible and can be used for numerous applications including carry bag handles, bowls, pots, gift items, studs, accessories for ornaments, etc. along with the advantage that they can be safely and easily disposed off in the environment.
• ropes are made out of coconut fibre and other natural materials. Such ropes are widely used in seaweed cultivation, but in general, the durability of the ropes is low in seawater. Ropes are also available- which are made up of synthetic/semi- synthetic fibres such as nylon, polyester, etc. Such ropes are routinely used in seaweed cultivation but their low/poor biodegradability is a great concern.
• JP20OO-O9308O wherein disclosed is the use of polysaccharides like polyvinyl alcohol, polyvinyl pyrrolidone, sodium alginate, etc. in preparation of antibacterial and antifungal agent composition, which is soluble when used. It is pertinent to mention here that the said reference reports the formation of soluble materials and does not describe any composition or process for the preparation of biodegradable hydrophobic composites which are insoluble in water.
• the inventors of the present invention realized that there exists a dire need to solve the issues discussed above and provide a composite through copolymerisation technique, to obtain controlled/completely hydrophobic biodegradable materials. It is evident from the prior art that there are no examples wherein polymers derived from seaweeds are utilised for preparation of hydrophobic composite materials which can be used for varied aqueous applications including seaweed cultivation in the sea water conditions.
• the main object of the present invention is to provide composite materials which are biodegradable as well as water resistant i.e. exhibit hydrophobicity.
• Another object of the present invention is to provide a process for the preparation of such hydrophobic biodegradable composites.
• Still another object of the invention is to provide said hydrophobic composites using hydrophilic natural polymers and synthetic organic monomers.
• Yet another object of the invention is to prepare ropes from the developed composites in a manner such that they are suitable for seaweed cultivation, are durable during use and at the same time, can be made to biodegrade in the soil/sea bottom.
• Still another object of the invention is to provide a process for the preparation of the said composites wherein hydrophobicity is imparted by introducing vinylated monomers through chemical interventions.
• the present invention relates to biodegradable hydrophobic composite materials and process for the preparation thereof.
• the invention further relates to the preparation of hydrophobic biodegradable composites from natural polymers such as the seaweed polysaccharides through grafting reaction with vinylated monomers e.g. vinyl acetate.
• the developed composites can be moulded in the form of ropes, which can be used as a substitute of synthetic ropes for varied applications including seaweed cultivation in the open sea.
• the results of cultivation experiments showed that the prepared ropes are suitable for cultivation of seaweeds in the sea environment, and yield higher biomass as compared to the braiders or nylon ropes.
• These ropes are very flexible and can also be used for making handles for carry bags, small ladies bags, and small school children bags. In addition, they can also be used for the preparation of designs on bowls, pots, jars and gift items like rings and bracelets.
• the present invention provides a process which uses agar, agarose, alginate and carrageenan alone as the seaweed polymers or uses combination of agar, agarose, alginate and carrageenan as the seaweed polymers.
• the present invention provides a process which makes the hydrophilic polymers hydrophobic so as to tolerate seawater conditions.
• the present invention provides a process which imparts such hydrophobicity through grafting of vinylated monomers.
• the present invention provides a process which imparts complete hydrophobicity through grafting of vinyl acetate and other such monomers.
• the present invention provides a process which tests the durability and efficacy of these composites in seawater and dry conditions. In yet another embodiment, the present invention provides a process which demonstrates the biodegradability of the composites in soil. In a further embodiment of the present invention, the ropes are prepared from seaweed polymer in a manner such that they are suitable for the preparation of biodegradable handles for carry bags.
• the ropes are prepared from seaweed polymer in a manner such that they are suitable for the preparation of biodegradable bowls, pots or jars for storage of food and non-food items.
• the ropes are prepared from seaweed polymer in a manner such that they are suitable for the preparation of biodegradable flower pots or jars for decoration.
• the ropes are prepared from seaweed polymer in a manner such that they are suitable for the preparation of designs on traditional items such as belts, bags and other small modern and fashionable items.
• the ropes are prepared from seaweed polymer in a manner such that they are suitable for the preparation of colored biodegradable ropes.
• the biodegradable ropes with controlled /complete hydrophobicity may be obtained from agar, agarose, carrageenans and alginate as well as their hybrid blends and more particularly agar and agarose.
• the microwave/conventional/autoclave heating is carried out at a temperature in the range of 100 to 120 degree Celsius for a period of 10 to 30 minutes to dissolve the seaweed polysaccharides or their blends and more particularly 15 minutes to obtain a homogeneous solution.
• the autoclave treatment is done at a temperature in the range of 100 to 120 degree Celsius to dissolve the seaweed polysaccharides or their blends for 10 to 30 minutes and more particularly 25 minutes to obtain a homogeneous solution.
• the water soluble initiator potassium persulphate (KPS) is added to the polymer mixture in the range of 0.01% to 0.04 wt% for the formation of active sites for grafting and more particularly 0.02 wt%.
• the water soluble initiator potassium persulphate (KPS) is added to the polymer mixture at a temperature in the range of 60 to 90 degree Celsius under stirring.
• the vinylated monomer is added in the polymer and initiator KPS mixture in the range of 2 to 16 wt% and more particularly 6 wt%.
• the vinylated monomer is added in the polymer and initiator KPS mixture in the temperature range of 60 to 85 degree Celsius under stirring for grafting with polymers present in the reaction mixture, more particularly at 80 degree Celsius.
• the biodegradable composites with complete/controlled hydrophobicity is obtained by grafting of agar, agarose, carrageenan and alginate as well as their hybrids with vinylated monomers, preferably vinyl acetate.
• the biodegradable composites with complete hydrophobicity is obtained by grafting of agar or agarose as well as their hybrids with vinyl acetate.
• the additive glycerol is added in the temperature range of 60 to 90 degree Celsius under stirring to inhibit the brittleness of the resulting ropes.
• the resulting molded composites are treated with organic solvents to remove the excess amount of unreacted monomer as well as water under ambient conditions.
• the organic solvent used is selected from the group consisting of acetone, methanol, ethanol, iso-propyl alcohol, ethyl acetate and tetra hydro furan (THF).
• the solvent treated composites are dried in air followed by an optional oven drying at 50 degree Celsius for 2 hours.
• the seaweed polysaccharides are chemically hydrophobised to have the controlled/complete hydrophobicity.
• biodegradable composites prepared from agar or agarose or carrageenans or their blends are suitable for seaweed cultivation in open sea water environment.
• the quality of biodegradable composites is same after recovering from the sea water environment after 45 days or after first harvest of the seaweed.
• biodegradable composites prepared from seaweed polysaccharides or their blends are suitable for the preparation of biodegradable carry bags handles, bowl, pots, designs, ornaments accessories, etc.
• the quality of biodegradable composites in the form of handles, bowl, pots, designs, ornaments accessories, etc. is same after storing in ambient conditions or using longer time up to more than one year.
• the biodegradable composites are easy to dispose off in the open environment.
• Figure 1 illustrates the biodegradable hydrophobic or controlled hydrophobic composites based colored ropes or rods, suitable for making decorative items, coloured handles for carry bags, ornaments accessories, etc.
• Figure 2 illustrates (a) cultivation of Kappaphycus alvarezii on the biodegradable hydrophobic ropes by the raft method, (b) cultivated plant in biodegradable hydrophobic composites based ropes of Examples 15 and 16, and (c) cultivated plant in synthetic ropes. The plant growth was higher in biodegradable ropes compared to synthetic ropes.
• Figure 3 illustrates (a) flexibility property of biodegradable ropes, (b) empty carry bag with handle of ropes of Examples 14-20, and (c) 5 kg weight in carry bag with handles of ropes of Examples 14-20.
• Figure 4 illustrates leather belt with beautiful designs made of biodegradable composites ropes of Examples 14-31.
• Figure 5 illustrates stud caps made of biodegradable composites ropes of Examples 14-3 1.
• Figure 6 illustrates bowl/basket made of biodegradable composites rope of Examples 14-31.
• Figure 7 illustrates storage of vegetables in bowl/basket made of biodegradable composites ropes of Example 38.
• Figure 8 illustrates storage of bakery items in bowl/basket made of biodegradable composites ropes of Example 38.
• Figure 9 illustrates decorative pot/jar made of biodegradable composites ropes of Examples 14-31.
• Figure 10 illustrates flowers in decorative pot/jar made of biodegradable composites ropes of Example 41.
• Figure 11 illustrates hand belts/bracelet made of biodegradable composites ropes of Examples 14-31.
• Figure 12 illustrates the drying of cloths on biodegradable composites ropes of Examples 15 and 16. DETAILED DESCRIPTION OF THE INVENTION
• the seaweed derived phycocolloids used for the purposes of the present invention are selected from agar bacteriological (product code: 0140132), agarose (product code: 01401 1) and alginate (product code: 1947295) which were commercially procured from M/s Sisco Research Laboratories (SRL) Pvt. Ltd. Mumbai - 400 093, Maharashtra, India, and semi refined carrageenan (product code: Aqua gel 250) which was commercially procured from M/s Aquagri Processing Pvt. Ltd., New Delhi, India.
• the present invention relates to biodegradable composite materials of controlled hydrophobicity exhibiting high mechanical strength and good flexibility.
• the invention also describes a facile, eco-friendly and one-step process for the preparation of the said materials from the seaweed polysaccharides and their blends through chemical reaction with vinylated monomers like vinyl acetate, acrylamide and acetonitrile.
• the said process comprises: dissolving 1 to 10 wt% of seaweed polysaccharides namely agar, carrageenans, alginate, agarose or their blends in distilled water by microwave heating at 100 degree Celsius for 5 to 15 minutes or by autoclaving at 120 degree Celsius for 30 minutes to obtain a homogenous solution, adding 0.01 to 0.10 wt% of potassium persulphate ( PS) under stirring to said solution followed by addition of 2 to 16 wt% vinylated monomers, heating the reaction mixture in aqueous medium under reflux conditions at 60 to 85 degree Celsius for 3 to 7 hours with constant stirring, adding 0.5 to 2.0 wt% of plasticizers selected from glycerol, sorbitol, ethylene glycol or other polyols into the reaction mixture and transferring the contents to the desired hollow or tubular devices/moulds made of glass or metal to obtain the desired moulded composites in various shapes, treating the resulting moulded composites with organic solvent at a temperature in
• Agar 4 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PAAm-composite (lb). It was observed (2) that the prepared composites were not hydrophobic and thus not suitable to be used for applications such as seaweed cultivation.
• Alginate 0.02 0.5 This produced highly water sensitive biodegradable composites named as Alginate/PAAm-composite (Id). It (2) was observed that the prepared composites were not hydrophobic and thus not suitable to be used for applications such as seaweed cultivation.
• Example 1 Experiments of Example 1 were repeated taking seaweed phycocolloid agarose (4 wt%) which was dissolved in water by autoclave heating at 120 degree Celsius for 30 minutes. To this, 0.02 wt% potassium persulphate (KPS) was added under stirring, followed by addition of 8 wt% acrylamide (AAm). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5 wt% glycerol was added into the heated reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• KPS potassium persulphate
• AAm 8 wt% acrylamide
• Agar 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PAAm-composite (lib). It was observed that (4) the prepared composites were not hydrophobic and thus not suitable to be used for applications such as seaweed cultivation.
• Example 1 Experiments of Example 1, were repeated taking seaweed phycocolloid agarose (6 wt%) which was dissolved in water by autoclave heating at 120 degree Celsius for 30 minutes. To this 0.02 wt% potassium persulphate ( PS) was added under stirring, followed by addition of 16 wt% acrylamide (AAm). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5wt% glycerol was added into the heated reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• PS potassium persulphate
• AAm 16 wt% acrylamide
• Agar 16 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PAAm-composite (Illb). It was observed that
• Alginate 16 0.02 0.5 This produced highly water sensitive biodegradable composites named as Alginate/PAAm-composite (Hid). It was
• Example 1 Experiments of Example 1, were repeated taking seaweed phycocolloid agarose (2 wt%) which was dissolved in water by microwave heating at 100 degree Celsius for 15 minutes. To this 0.02 wt% potassium persulphate (KPS) was added under stirring, followed by the addition of 4 wt% acrylonitrile (ACN). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5 wt% glycerol was added into the heated reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• KPS potassium persulphate
• ACN acrylonitrile
• Alginate 0.02 0.5 This produced highly water sensitive biodegradable composites named as Alginate/PACN-composite (2)
• Example 2 Experiments of Example 2, were repeated taking seaweed phycocolloid agarose (4 wt%) which was dissolved in water by autoclave heating at 120 degree Celsius for 30 minutes. To this 0.02 wt% potassium persulphate ( PS) was added under stirring, followed by addition of 8 wt% acrylonitrile (ACN). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5 wt% glycerol was added into the heated reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• PS potassium persulphate
• ACN 8 wt% acrylonitrile
• Agar 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PACN-composite (Vb). It was observed that (4)
• the prepared composites were not hydrophobic and thus not suitable to be used for applications such as seaweed cultivation.
• Alginate 0.02 0.5 This produced highly water sensitive biodegradable composites named as Alginate/PACN-composite (Vd). It (4)
• KPS potassium persulphate
• Agar 16 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PACN-composite (VIb). It was observed that
• the prepared composites were not hydrophobic and thus not suitable to be used for applications such as seaweed cultivation.
• KPS potassium persulphate
• Agar 2 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PVA-composite (Vllb). It
• Alginate 2 0.02 This produced highly water sensitive biodegradable composites named as Alginate/PVA-composite
• moulded composites were treated with organic solvent at a temperature of 25 degree
• Agar 0.02 0.5 This produced water sensitive biodegradable composites named as Agar/PVA-composite (VHIb). It was observed (4)
• Alginate 0.02 0.5 This produced highly water sensitive ⁇ biodegradable composites named as Alginate/PVA-composite (Vllld). It (4)
• KPS potassium persulphate
• Example 1 Experiments of Example 1 , were repeated taking seaweed phycocolloids agarose (2 wt%) which was dissolved in water by microwave heating at 100 degree Celsius for 15 minutes. To this 0.02 wt% potassium persulphate (KPS) was added under stirring, followed by the addition of 2 wt% vinyl acetate (VAc). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h under constant stirring and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes. The resulting moulded composites were treated with organic solvent at a temperature of 25 degree Celsius to remove the unreacted homopolymer followed by air drying. This produced improved hydrophobicity of the composites named as
• Agar 2 0.02 NIL This produced improved hydrophobicity of the composites named as Agar/PVAc-composites (Xb). It
• Alginate 2 0.02 NIL This produced improved hydrophobicity of the composites named as Alginate/PVAc-composites (Xd).
• Agar 8 0.02 NIL This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (Xlb). It was (4)
• Alginate 0.02 NIL This produced highly water non sensitive biodegradable composites named as Alginate/PVAc-composite (Xld). It (4)
• KPS potassium persulphate
• reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring and then transferred into the desired hollow vessels/devices/moulds to obtain the desired
• Agar 16 0.02 NIL This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (Xllb). It was (6)
• Alginate 16 0.02 NIL This produced highly sensitive to water biodegradable composites named as Alginate/PVAc-composite (Xlld). It (6)
• KPS persulphate
• Examples 1 to 9 demonstrated that vinylated reagents like AAm, ACN, and PVA produced composites (la to IXd), which were water sensitive and thus, were not suitable to be used for water applications such as seaweed cultivation and other similar applications.
• Examples 10 to 12 further demonstrated that vinyl acetate used as reagent produced composites (Xa to Xlld) with improved hydrophobicity compared to the parent seaweed phycocolloids, which are non-flexible, brittle in nature, and thus not suitable to be used for seaweed cultivation and other potential applications. These findings also revealed that a suitable plasticizer needs to be added to improve the flexibility and smoothness of these composites.
• Example 13 further demonstrated that vinyl acetate alone used as reagent produced hydrophobic PVAc (XIII) polymers, which are highly sensitive to organic solvents, and hence are not suitable to be used for seaweed cultivation and other applications.
• Example 10 Experiments of Example 10, were repeated taking agarose (2 wt%) which was dissolved in water by microwave heating at 100 degree Celsius for 15 minutes. To this 0.02 wt% potassium persulphate (KPS) was addedunder stirring, followed by addition of 5 wt% vinyl acetate (VAc). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5 wt% glycerol was added into the reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes. The resulting moulded composites were treated with organic solvent at a temperature of 25 degree Celsius to remove the unreacted homopolymer followed by air drying.
• KPS potassium persulphate
• VAc vinyl acetate
• Agar 5 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XlVb). It (2)
• Alginate This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XlVd).
• KPS potassium persulphate
• Agar 10 0.02 0.5 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XVb). It
• the prepared composites were hydrophobic biodegradable with high strength and thus suitable to be used for potential applications such as seaweed cultivation.
• Example 12 Experiments of Example 12, were repeated taking agarose (6 wt%) which was dissolved in water by microwave heating at 100 degree Celsius for 15 minutes. To this 0.02 wt% potassium persulphate (KPS) was added under stirring, followed by addition of 12 wt% vinyl acetate (VAc). The reaction mixture was heated in aqueous medium under reflux conditions at 80 degree Celsius for 5 h with constant stirring. 0.5 wt% glycerol was added into the reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes. The resulting moulded composites were treated with organic solvent at a temperature of 25 degree Celsius to remove the unreacted homopolymer followed by air drying.
• KPS potassium persulphate
• VAc vinyl acetate
• Agar 12 0.02 0.5 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XVIb). It
• Examples 15 and 16 further demonstrated that seaweed phycocolloids namely agarose and agar (4 and 6 wt%) with VAc produced water non sensitive biodegradable composites (XVa,b and XVIa,b). It was observed that the prepared composites (XVa,b
• XVIa,b were hydrophobic biodegradable with high strength and thus suitable to be used for potential applications such as seaweed cultivation.
• reaction mixture was heated in aqueous medium under reflux conditions at 80 degree
• the resulting moulded composites were treated with organic solvent at a temperature of 25 degree Celsius to remove the unreacted homopolymer followed
• biodegradable composites named as Agarose/SRC/PVAc-composites (XVIIIa). It was
• the prepared composites were hydrophobic biodegradable with high strength and thus suitable to be used for potential applications such as seaweed cultivation. Yields and compositions of the prepared composites are in the range as
• composites having improved hydrophobicity and low strength and thus not suitable to be used for applications such as seaweed cultivation.
• biodegradable composites named as Agar/SRC/PVAc-composites (XlXa). It was observed that the prepared composites were hydrophobic biodegradable with high
• biodegradable composites named as Agar/SRC/PVAc-composites (XXa). It was found that
• Example 20 Effect of different reaction parameters and other variables in Example 20.
• KPS potassium persulphate
• VAc 14 wt% vinyl acetate
• glycerol was added into the reaction mixture and then transferred into the desired
• Agar This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXIb & (7)
• Alginate This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXI (7)
• KPS potassium persulphate
• glycerol was added into the reaction mixture and then transferred into the desired
• agarose 39 ⁇ 2 wt%
• PVAc 50 ⁇ 2 wt%
• Alginate 2-16 0.08 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXIId (5)
• KPS potassium persulphate
• VAc 9 wt% vinyl acetate
• Agar 9 0.02 1.5 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXIIIb & b'). It was (4) observed that the prepared composites were hydrophobic biodegradable with high strength and thus suitable to be used for potential applications such as seaweed cultivation
• Alginate 9 0.02 1.5 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXIIId & d')- It was (4) observed that the prepared composites having improved hydrophobicity and low strength and thus not suitable to be used for applications such as seaweed cultivation.
• KPS potassium persulphate
• VAc 14 wt% vinyl acetate
• Agar 14 0.02 3.0 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXIVb & (4)
• Alginate 14 0.02 3.0 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXIVd
• KPS potassium persulphate
• VAc 12 wt% vinyl acetate
• glycerol was added into the reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• the resulting moulded composites were treated with organic solvent at a temperature of 25 degree Celsius to remove the unreacted homopolymer followed by air drying. This produced water non sensitive biodegradable composites named as Agarose/PVAc-composites (XXVa & a').
• Agar 12 0.02 5.0 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXVb &
• Alginate 12 0.02 5.0 This produced water non sensitive biodegradable composites named as Alginate/PVAc -composite (XXVd
• KPS potassium persulphate
• VAc 12 wt% vinyl acetate
• biodegradable composites named as Agarose/PVAc-composites (XXVIa & a'). It was
• compositions are according to the composites prepared in Examples 15 and 16.
• KPS potassium persulphate
• VAc 14 wt% vinyl acetate
• Agar 14 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXVTIb &
• Alginate 14 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXVII (6)
• KPS potassium persulphate
• VAc 10 wt% vinyl acetate
• biodegradable composites named as Agarose/PVAc-composites (XXVIIIa & a'). It was
• Agar 10 This produced water non sensitive biodegradable composites named as Agar PVAc-composite (XXVIIIb &
• Alginate 10 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXVIII (6)
• KPS potassium persulphate
• VAc 8 wt% vinyl acetate
• ethylene glycol was added into the reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• the resulting moulded composites were treated with organic solvent at a temperature of 25 degree
• Agar 0.02 0.5 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXIXb &
• KPS potassium persulphate
• VAc 10 wt% vinyl acetate
• ethylene glycol was added into the reaction mixture and then transferred into the desired hollow vessels/devices/moulds to obtain the desired shapes.
• the resulting moulded composites were treated with organic solvent at a temperature of 25 degree
• Agar 10 This produced water non sensitive biodegradable composites named as Agar/PVAc-composite (XXXb &
• Alginate 10 This produced water non sensitive biodegradable composites named as Alginate/PVAc-composite (XXXd (8)
• KPS potassium persulphate
• VAc 10 wt% vinyl acetate
• moulded composites were treated with organic solvent at a temperature of 25 degree
• color reducing food grade dyes namely Brilliant Blue FCF, Allura Red AC , and
• Examples are biodegradable and eco-friendly.
• biomass and daily growth rate were 480 grams and 4.48% respectively in the biodegradable ropes.
• DGR% daily growth rate
• hydrophobic biodegradable composites prepared in Examples 14-20 were used as the hydrophobic biodegradable composites.
• polysaccharides based handles offers superior feeling when carrying bags compared to
• hydrophobic biodegradable composites prepared as per the procedure of Example 14-31 were used as biodegradable cap of studs (Fig. 5). Stud cap of biodegradable ropes offers superior feeling when worn in ear compared to synthetic one. Even after 2 months there was no adverse effect or any allergic effect on the skin of the ear.
• the hydrophobic biodegradable composites prepared as per the procedure of Example 14-31 were used for the preparation of biodegradable bowl, which has capacity to carry 2-5 kg weight (Fig. 6). It was observed that it offer attractive look while in use of keeping vegetables and fruits in biodegradable bowl compared to synthetic. Even after 9 months there was no considerable change in the performance and quality of the biodegradable bowls.
• the bowl prepared as per Example 38 was used as biodegradable bowl for storage of vegetable and fruits items, which has the capacity to carry 2-5 kg weight (Fig. 7). It was observed that it offers attractive look in house when vegetable and fruits were kept in biodegradable bowl as compared to synthetic. Even after 9 months there was no considerable change in the performance and quality of the biodegradable bowls.
• EXAMPLE 40 The bowl prepared as per Example 38 was used as biodegradable bowl for storage of biscuits, chips and other food packets, which has the capacity to carry 2-5 kg weight (Fig. 8). It was observed that it offers attractive look in house when biscuit and chips and other food packets were kept in biodegradable bowl as compared to synthetic. Even after 9 months there was no considerable change in the performance and quality of the biodegradable bowls.
• EXAMPLE 41
• the hydrophobic biodegradable composites prepared as per the procedure of Examples 14-20 were used as biodegradable flower pots/jars, which provided good looks and feeling (Figs. 9 and 10). It was observed that it offers attractive look in house when flowers were kept in biodegradable pots/jars. Even after 11 months there was no considerable change in the performance and quality of the biodegradable flower pots/jars.
• the hydrophobic biodegradable composites prepared in Examples 14-31 were used for making biodegradable gift items including hand belts (Fig. 11). It was observed that it offered attractive look in hands. Even after 6 months there was no adverse effect on the skin as well as the performance and quality of the biodegradable hand belts.
• hydrophobic biodegradable composites prepared in Examples 15 and 16 were used for drying of cloths in environmental conditions (Fig. 12). It was observed that it offered attractive look in houses and no rusting was observed even after 3 months of use. After 3 months there was no adverse change on the smoothness as well as on the performance and quality of the hydrophobic biodegradable composites.
• the present invention provides a solution to said problem by providing biodegradable hydrophobic composites which can be moulded in form of ropes that can be well used for seaweed cultivation. • By blending monomers such as vinyl acetate onto the seaweed polymers it is possible to impart enhanced hydrophobicity to the prepared composites without compromising excessively on their biodegradability, especially in soil.
• the prepared biodegradable hydrophobic composites exhibit high thermal stability which allows them to be sterilized at high temperature for wider applications such as in pharmaceutical applications.
• the prepared biodegradable hydrophobic composites exhibit stability in water up to 90 degree Celsius which may be used for wider aqueous applications such as cultivation of seaweeds in open sea water.

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• 2013
  • 2013-10-11 WO PCT/IN2013/000617 patent/WO2014057502A1/en active Application Filing
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