SK33794A3 - Improved adhesives and sealants materials - Google Patents

Abstract

The improved adhesion is provided by incorporating into an adhesive and/or sealant plastic material an effective amount of cyclodextrin or a complex of cyclodextrin and blowing agent. Where the complex of cyclodextrin and blowing agent is employed, an expandable mixture is formed.

Description

Blowing agents, sometimes referred to as foaming agents, are substances which act to form a cellular structure in a liquid formulation on a plastic or rubber substrate. Common blowing agents include fluorocarbons, nitrogen gas, hydrazine derivatives, trihydrazine triazines, 5-phenyltetrazole, p-toluenesulfonylsemicarbazide, modified azodicarboxamides and azodicarboxamides. Chemical blowing agents form a group of blowing agents, which are solid or liquid at room temperature and evolve gas upon heating. A well known group of chemical blowing agents is sold under the trade name CELOGEL (Uniroyal, Inc).

Blowing agents are commonly used in the production of a wide range of consumer products and self-sealing sealants. Furthermore, blowing agents together with adhesive plastic materials are used in the hot melt of the adhesive. Furthermore, blowing agents are also used in the packaging of foodstuffs, as is the case for a part of the animals, as the butcher cuts them with a view to resale. Such a product is commonly referred to as a bone cut.

Chemical blowing agents are typically used by mixing the blowing agent with a rigid plastic material and then heating the mixture while keeping the mixture under pressure. By heating the plastic material flowing off and also from the blowing agent, gas is released. This then forms bubbles or empty voids in the liquid plastic material.

Chemical blowing agents have an advantage over gas in that they can be added to the solid plastic material prior to heating. Gaseous blowing agents such as nitrogen or some fluorocarbons need to be injected into the liquefied plastic material. In the case of hot melt adhesives and sealants, the gas is mixed with the adhesive composition prior to the nozzle orifice.

The use of fluorocarbons as blowing agents has been the subject of severe criticism with regard to the adverse impact on the earth's ozone layer. Other conventional blowing agents present handling, toxicity and flammability problems. Handling problems include storage stability, dustiness and explosion hazards.

SUMMARY OF THE INVENTION

It has now been found that the use of cyclodextrins in adhesive and sealant compositions improves the adhesive quality of such a composition. It has also been found that the cyclodextrin-blowing agent complex functions as a blowing agent in the liquid adhesive and / or adhesive material, as well as improving the adhesive property of the adhesive or sealant. In addition, the cyclodextrin stabilizes the blowing agent. It has also been found that some chemical compounds which have never been used in this sense have been used as blowing agents.

The process according to the invention comprises mixing the cyclodextrin with an adhesive or sealant plastic material, the mixture thus prepared being applied to the surface. In the case of an adhesive or sealant of increasing volume, the process comprises the step of preparing a mixture of adhesive and / or sealant of the nature of the plastic material and of the blowing agent and cyclodextrin complex, releasing gas from the complex. This then forms empty voids in the liquid plastic material.

The step of forming the cyclodextrin chemical blowing agent complex is performed before the complex is mixed into the plastic material.

The mixture is heated either by the use of heat, as is typically the case in conventional extrusion or blow molding processes, or by an exothermic reaction, as is the case with polyurethanes.

The adhesive or sealant composition prepared in accordance with the present invention comprises an adhesive or sealant plastic material and a blowing agent-cyclodextrin complex. As mentioned above, it has been found that the adhesive properties of the adhesive or sealant composition are improved in the presence of cyclodextrin in the composition. Thus, the cyclodextrin appears not only as a substrate for the blowing agent, but also as a tackifier or adhesion promoter.

The amount of cyclodextrin that is added to the adhesive and / or sealing plastic material is an effective amount that improves the adhesion of the adhesive and / or sealing material. Preferably, it corresponds to the amount of cyclodextrin that is added to the adhesive or sealant with a view to improving its adhesion. Most preferably, the addition of from about 1 to about 10 parts of cyclodextrin to the adhesive and / or sealing plastic material appears to improve the corresponding adhesion. The amounts also correspond to the amounts of the dextrin-blowing agent complex that is added to the adhesive and / or sealing plastic material in accordance with the present invention.

A mixture of cyclodextrin and adhesive and / or sealing material or a mixture of a cyclodextrin complex with a blowing agent and adhesive and / or sealing plastic material can be prepared using any method used for adhesive and / or sealing materials.

Cyclodextrins, also referred to as Schardinger dextrins, cycloamylases, cyclomaltoses, and cycloglucans, are anhydroglucose oligomers linked to each other by α-1,4-bonds to form ring structures. If it contains 6-glucose residues, it is referred to as α-cyclodextrin, with seven as β-cyclodextrin and with eight β-cyclodextrin. These six-, seven- and eight-membered formations are also referred to as cyclomaltohexaoses, cyclomaltoheptanoses and cyclomaltooctanoses in each case.

Cyclodextrins are conveniently prepared by treating the starch suspension with an enzyme or acid to form a gelatinous or liquefied slurry with a DE value of between 1 and 5. The product so obtained is then treated with a cyclodextrin-glucosyltransferase at a suitable pH, temperature and time suitable of the cyclodextrin-glucosyltransferase used. This enzyme is obtained from microorganisms such as Bacillus macerans, B. megaterium, B. circulans, B. Stearotermophilus and Bacillus sp. (alkalifile) and others. The obtained extract for the treatment of the gelatinous or liquefied starch slurry by the action of cyclodextrin-glucosyltransferase is then separated and purified in order to obtain cyclodextrins.

substances. As a result, it can physically

One very important aspect of cyclodextrins is their ability to act as clathrates or carriers of other compounds, or a hollow-shaped cyclodextrin; serve as clathrate for substances whose outer geometric dimensions correspond to the diameter of the cyclodextrin depression. The outer surface of such materials can be modified by various side chains, as is the case with hydroxypropylcyclodextrin, with the shape formed inside the cavity surface of the cyclodextrin. The term cyclodextrin as used herein and the appended claims means not only cyclodextrin per se but also modified and branched cyclodextrins.

The term cyclodextrin-blowing agent complex or complex as used herein and the appended claims means not only a cyclodextrin-blowing agent assembly wherein the cyclodextrin is a blowing agent carrier, but also the case where the blowing agent is tightly attached to the outside of the cyclodextrin by weak binding forces.

The process of forming a complex between the cyclodextrin and the blowing agent is based on dissolving the cyclodextrin in water together with the blowing agent, then filtering off the precipitated product.

Another way is to fill the ball mill with a cyclodextrin and a blowing agent, with the cartridge being ground for a certain time in the mill. This forms a complex of cyclodextrin and blowing agent. Another known process for forming a cyclodextrin-host molecule complex is based on kneading, lyophilizing and milling the product with both components. Good results are also achieved by crushing together in a mortar using a pin.

The cyclodextrins used in the process according to the invention are α-, β- and X'- type substances. Β-cyclodextrins are preferred with regard to their commercial availability. The complex formed by the combination of all three cyclodextrins is characterized by varying rates at which the blowing agent is released. This is believed to be due to the different binding forces between the blowing agent and the different cyclodextrins.

Suitable blowing agents include liquids such as water, propylene glycol, dipropylene glycol, tripropylene glycol, cyclohexylamine, dicyclohexylamine and ethylene glycol, as well as solids such as benzoyl peroxide and other peroxides, but are difficult to handle. It is surprising and quite unexpected that water, propylene glycol, dipropylene glycol, tripropylene glycol, and ethyl alcohol are useful as blowing agents. Until now, substances such as water, propylene glycol, tripropylene glycol and ethylene glycol have never been used as blowing agents due to their poor dispersibility in plastic materials.

Solids such as benzoyl peroxide are used in such difficulty procedures with respect to low decomposition temperatures. Both water and propylene chloride should be considered safe and non-toxic to humans. Many of the numerous blowing agents are toxic to humans. The use of non-toxic blowing agents in the workplace brings with it a great degree of safety in the workplace, which has not been known so far. By using a combination of two or more blowing agents such as water and propylene glycol or by using different cyclodextrins with these blowing agents, the application temperature of the blowing agent can be varied.

In addition, conventional chemical blowing agents such as hydrazine derivatives, triazine trihydrazines, 5-phenyltetrazole, p-toluenesulfonyl semicarbazide, which form a complex with cyclodextrins, may be used as blowing agents in accordance with the process of the invention. Conventional blowing agents complexed with cyclodextrin reduce dustiness and stabilize the entire formulation.

The amount of blowing agent used to complex the cyclodextrin is from about 1 to 30 parts by weight per 100 parts by weight of cyclodextrin. More preferably, the ratio is from about 3 to 15 parts, but most preferably from about 5 to about 7 parts of the blowing agent together with the cyclodextrin.

An excess amount of blowing agent can be used to prepare the cyclodextrin-blowing agent complex.

A suitable source of the cyclodextrin-water complex is cyclodextrin from conventional cyclodextrin preparation procedures. This generally contains about 10 to about 12 parts by weight of water. The use of such a cyclodextrin in the adhesive composition provides sufficient gas evolution upon heating of such a commercially available cyclodextrin complexed with about 10-12 parts of water that serves as a blowing agent.

In general, it has been found that the smaller the particle size of the complex, the more uniform the size of the voids formed. Good results in this respect are obtained by using a cyclodextrin-blowing agent complex whose particles are capable of passing through 0.075 mm orifices in size.

Suitable plastic materials include polymers such as polystyrene, polyvinyl chloride, polyethylene, polyurethane, polyphenols, polypropylene, polyisoprene (rubber), polybutadiene, as well as corresponding copolymers such as copolymer of acrylic nitrile, butadiene and styrene, styrene and styrene and styrene and styrene. ethylene and butylene; styrene and butadiene; and ethylene and vinyl acetate. A specific example of an adhesive plastic material is ethylene vinyl acetate, a copolymer of acrylic nitrile with butadiene and styrene, as well as styrene with isoprene. Good results are obtained with ethylene vinyl acetate.

Typical adhesive formulations include:

in accordance with the present invention parts by weight ethylene vinyl acetate modified resin waxes all adhesive plastic material antioxidants filler complex blowing agent and cyclodextrin

The bonding agent has the following composition:

25-50

25-60

0-30

100

0.05-0.5 parts 0-100 parts 1-10 books in accordance with this invention parts by weight ethylene vinyl acetate 35-45 modified resin 20-30 plasticizer 20-30 plastic adhesive material, total 100 antioxidants 0.05-0.25 blowing complex with cyclodextrin 1-10 antifungal agent (optionally)

1-10

As a blowing agent-cyclodextrin complex, a cyclodextrin-water complex containing between 8 and about 15 parts by weight of water is preferably used. The amount of the complex to be used in the bookbinding adhesive is in the range of about 3 to 7 parts with a water content of between about 10 to 15 parts.

The use of a microbial or fungicidal agent complexed with a cyclodextrin - when added to the adhesive composition - aids protection and prevents degradation, i.e. degradation, of the agent. The water acts as a blowing agent and then aids in the release of the microbial agent or fungicide.

The bookbinding adhesive is prepared by mixing all of the above and the required ingredients in a conventional manner.

The temperature of such adhesives ranges from about 120 ° C to about 205 ° C.

The use of a water-cyclodextrin complex has some advantages over the prior art using liquid nitrogen. Current machinery for use in hot melt bookbinding requires a special machine adaptation that permits the use of liquid nitrogen. By using the cyclodextrin-water complex of the present invention, a much larger selection of devices can be used.

Furthermore, the opening time of the book is longer, there is much better contact between surfaces, and smaller amounts of adhesive need to be used to cover the same surface.

The adhesive for sealing cartons and crabs in accordance with the present invention comprises:

parts by weight ethylene vinyl acetate 40 modified resin 40 wax 20

Plastic adhesive material, total 100 antioxidants 0.01 blowing agent complex with cyclodextrin 1-10

Preferably, a propylene glycol-cyclodextrin complex containing from about 8 to about 15 parts propylene glycol is used as the blowing agent-cyclodextrin complex. Preferably, from about 3 to about 7 parts of this complex with a propylene glycol content of about 10 to about 13 parts is used.

The carton and crab sealing agent is prepared by mixing all the components together with a conventional procedure.

The temperature of the adhesive used to seal the carton and the cartons is from about 175 to about 205 ° C.

The adhesive composition of the invention comprises:

Compliance with this parts by carpet reinforcement in ethylene vinyl acetate modified resin waxes all adhesive plastic material antioxidant filler complex blowing agent and cyclodextrin

25-50

25-60

0-30

100

0.05-0.5

0-100

1-10

The blowing agent and cyclodextrin complex as used in this carpet reinforcing adhesive is a cyclodextrin complex with about 8 to about 15 parts water, propylene glycol or a combination of water and propylene glycol or a combination of water, propylene glycol and hydrazine derivatives.

Then, such a carpet reinforcing adhesive preferably comprises a cyclodextrin / antifungal composition in an amount of up to about 1 part. Suitable antifungal agents include diiodomethyl-p-tolylsulfone, phenols and butylhydroxytoluene: diiodomethyl-p-tolylsulfone is preferred and the release of this substance can be influenced by the water released from the cyclodextrin.

Carpet reinforcing adhesive is prepared by mixing all the components together in a conventional manner.

Temperatures using this carpet reinforcing agent are in the range of about 65 to about 70 ° C.

It has been found that due to the presence of cyclodextrin in these various adhesives and sealants, the adhesive nature of the sealant or adhesive composition also increases.

A small amount of the enzyme, known as amylose, when added to the extensible plastic composition of the present invention, acts upon heating as a catalyst and accelerates the release of the blowing agent from the cyclodextrin. If the amylase is to act as a catalyst, there must be some water in the plastic composition. It is believed that amylase will utilize water to destroy and disrupt the cyclodextrin and thereby accelerate the release of the blowing agent.

It goes without saying that it is possible to add other substances to the plastic materials containing blowing agents according to the invention, for example anti-fungal agents, fungicides and fragrances.

DETAILED DESCRIPTION OF THE INVENTION

These and other aspects of the present invention will become more apparent with reference to the following examples.

Example 1

This example describes a hot melt adhesive composition in accordance with the present invention with a specific book binding purpose.

Bookbinding material parts by weight ethylene vinyl acetate-507 45 resin Staybelite 25 pentalyn H 20 microcrystalline wax 10 all bookbinding material 100

0.1 parts of an antioxidant and 10 parts of a water-β-cyclodextrin complex are added to the adhesive plastic material; this complex contains 7.5 g of β-cyclodextrin and 2.5 g of water. The water can be complexed into the cyclodextrin by mixing excess water with the cyclodextrin. After mixing the adhesive plastic material with the antioxidant and the water-β-cyclodextrin complex, the mixture is heated to 100 ° C, at which point the water changes from a liquid phase to a gas, causing the adhesive to expand. The percent expansion by volume, calculated as the adhesive, is about 100%.

Ethylene vinyl acetate-507 is a commercially available copolymer of ethylene and vinyl acetate (Union Carbide Co). Staybelite resin is a hydrogenated resin and a plasticizer based on diethylene glycol esters and hydrogenated resins (Hercules Powder Co). Pentalyn H is a synthetic resin (Hercules Powder Co). Microcrystalline wax is a commercially available wax (Petrolite Co.,

Tulda, Oklahoma).

As an antioxidant, Irganox 1010 from Ciba-Geigy Co. is used. β-cyclodextrin was a commercial product from the American Maize-Products Company (Hammond, Indiana). Quite normal tap water is used as water.

It is surprising and unexpected that the cyclodextrin-water complex was effective in the form of this composition, since the water used as such did not appear at all as a blowing agent in this bookbinding adhesive composition.

Example 2

This example describes the preparation of an adhesive composition for cartons and boxes in accordance with the present invention.

Material weight parts

ethylene-305 40 CKM-2400 15 Piccolyte A-115 12.5 Super STATAC 12.5 polyvosk 1000 10 castor wax 10 Plastic adhesive material, total 100

0.1 parts of an antioxidant and 10 parts of propylene glycol-β-cyclodextrin complex are added to the adhesive plastic material; this complex contains 1 mole of β-cyclodextrin and 2 moles of propylene glycol, which is formed by mixing an excess of propylene glycol with β-cyclodextrin.

The mixture of the adhesive material, the antioxidant and the propylene glycol-β-cyclodextrin complex thus heated is heated, the propylene glycol is transferred from the liquid to the gaseous state, which results in an increase in the volume of the adhesive composition. Due to the blowing agent, i.e. propylene glycol, the volume increases by about 100%.

Ethylene vinyl acetate-305 is a commercially available copolymer of ethylene and vinyl acetate (Union Carbide). The CKM-2400 is also a Union Carbide product. Piccolite A-115 is a thermoplastic terpene resin (Hercules). Super STATAC is from Reichold Chemical Inc. Polywax 1000 was obtained from Bareco and Castor Wax from Universal Preservachems. Irganox 1010 was used as an antioxidant. Β-Cyclodextrin was a commercially available product from the American Maize-Products Company (Hammond, Indiana). Propylene glycol was a commercially available product (Dow Chemicals).

It is surprising and unexpected that the propylene glycol / cyclodextrin complex was effective in this formulation because when propylene glycol was used as such, it did not act as a blowing agent at all.

Example 3

This example describes the preparation of a carpet reinforcing agent in accordance with the present invention. The corresponding adhesive composition was prepared as follows:

Material parts by weight ethylene vinyl acetate 50 resin modifying 40 waxes 10 plastic adhesive material (total) 100 antifungal agent (optionally) 1-10

The blowing agent complexes simultaneously

0.1 parts of an antioxidant, about 20 parts of a filler and 5 parts of a β-cyclodextrin water complex together with 5 parts of a propylene glycol β-cyclodextrin complex are added to the adhesive plastic material. The blowing agent and cyclodextrin complexes were prepared according to the procedures of Examples 1 and 2 above.

and cyclodextrin are mixed with the adhesive using the procedures of Examples 1 and 2 described above.

After the mixture of the adhesive composition with both blowing agents has been heated to about 195 ° C, the adhesive composition is expanded.

Ethylene vinyl acetate was a commercially available product, i.e. a copolymer of ethylene and vinyl acetate. Modified resins were commercially available wood resins, waxes commonly used in such treatments. The antioxidant was Irganox 1010 and conventional calcium carbonate was used as filler.

Example 4

This example describes a pressure-sensitive adhesive composition in accordance with the present invention. The following adhesive formulation was obtained:

Material parts parts ethylene vinyl acetate 501 ethylene vinyl acetate 605 ester Staybelite 10

Abitol plastic adhesive (total)

100

0.1 parts of Irganox 1010 antioxidant, 5 parts of water-β-cyclodextrin complex as well as 5 parts of cyclohexylamine-β-cyclodextrin complex are added to the adhesive materials. The water-β-cyclodextrin complex contains 12.8 parts of water. The β-cyclodextrin-cyclohexylamine complex, a volatile corrosion inhibitor, contains 8 parts of cyclohexylamine complexed with cyclodextrin. The complexes are prepared as well as admixing the components of the adhesive composition in accordance with Example 1.

The moisture release is a starting mechanism whereby the cyclohexylamine bound to the complex is partially released so that it is in equilibrium with the released moisture from the water-cyclodextrin complex. Such a mechanism provides corrosion protection on the metal surface. The cyclodextrin-cyclohexylamine complex stabilizes the cyclohexylamine during the heating process.

Cyclohexylamine, when not bound in the complex, is not stable in heating the adhesive composition. Ethylene vinyl acetate 501 and 605 were commercially available copolymers of ethylene and vinyl acetate (Union Carbide). Ester Staybelite 10 and Abitok were products from Hercules Co. Temperature when used in the range 65-75 ’C.

Example 5

Disclosed is the preparation of an expandable, curable sealant in accordance with the process of the present invention.

A. Substrate for hot sealing

Folder Parts

Kraton PC 1901 (Shell) 100 Regalrez 1018 (Hercules) 270 Endex 155 (Hercules) 50 Irganox 1010 (Giba-Geigy)

B. Calcium sulphonate (Witco) plasticizer 10 β-cyclodextrin-dicyclohexylamine complex (molar ratio 2: 1) 2

Aluminum paste (50 to 50 aluminum in sunpar

2280 from Sun Oil) 1 β-cyclodextrin with 10-13% water 2

Equal amounts of hot-melt substrate and plasticizer are mixed, and after cooling, the mixture is applied to a cold rolled steel sheet or a cold galvanized steel sheet, transferred to a furnace and heated for 15 minutes.

200 ° C. The material expands on the surface in both directions, i.e. vertically and horizontally, so that the mixture doubles in volume.

Example 6

A mixture of 50 parts of the hot-melt substrate of Example 5 as above and 50 parts of the overlaid calcium sulphonate is prepared by heating the second component, the calcium salt, before mixing to evaporate the water. The mixture is then applied to a rolled steel or cold galvanized steel plate and heated in an oven at 200 ° C for 15 minutes. The mixture dissolves by heating and spills over the plate without increasing its volume.

Adhesion Comparison of Examples 5 and 6

The material of Example 6 was evaluated for adhesion to a cold rolled and galvanized steel plate as compared to the material of Example 5 described above. The cured material of Example 5 adhered more firmly to the cold rolled or galvanized steel plate as compared to the material of Example 6. It was found that the material of Example 6 could be easily peeled from the plates while the material of Example 5 (hence the present invention) easily can not remove.

Example 7

A mixture is prepared as in Example 6 except that the water does not evaporate from the overcoated calcium sulfonate before mixing and applying to a cold rolled and galvanized steel plate and before heating in an oven to 200 ° C. The composition of this example rapidly cured in place. Curing accelerated due to water leakage, as evidenced by the complete immobility of the mixture and the deformation of the material placed on the plates.

Example

A mixture was prepared as in Example 6, but the mixture was not allowed to cool. The mixture was placed on a cold rolled steel or galvanized steel sheet, all placed in an oven at 200 ° C. This material is about twice as large in volume. The blowing agent (water) was in the cyclodextrin and released during heating with cyclohexylamine (vapor phase corrosion inhibitor). Water in the cyclodextrin is controlled and is not available for curing unless sufficient heat is used to initiate its release.

Example 9

Common sealants are prepared as follows:

Folder Parts

Kraton RD 6501 100 Regalrez 1018 270 Endex 155 Hercules 50 Irganox 1010 (Ciba Geigy) 1

This material is applied cold on a rolled steel plate or galvanized plate and these are placed in an oven at 200 ° C for 15 minutes. This material dissolves and spills over the plate.

Example 10

In the example, a mixture of the ingredients of Example 9 is used to prepare the sealing material of the present invention:

Ingredients mixture of example 9 β-cyclodextrin (10-13% water)

parts

Everything is placed on a cold plate of rolled or galvanized steel and then heated to 200 C.C for 15 minutes. This sealant is expanded by volume, but by no means 100% of the original volume.

Adhesion Comparison of Examples 9 and 10

The adhesion to the steel plates of the material in accordance with Example 9 was compared to that of Example 10. It was found that the sealing material of Example 10 (hence the present invention) adhered better to the steel plate compared to the product of Example 9.

The sealant of Example 10 was also tested for relative adhesion to a cold and galvanized steel plate, stating that the material adheres better to the rolled plate compared to the galvanized plate.

Example 11

Another chemical blowing agent complexed with a cyclodextrin is disclosed

Component Parts mixture of example 9 10 β-cyclodextrin-dibutylstannidilaurate complex 2 β-cyclodextrin (10-13% water) 2

After mixing, the mixture is applied to a cold rolled and galvanized steel plate and heated in an oven for 15 minutes to

200 C. This material also expanded by heating by about 100% compared to the original volume.

Adhesion Comparison of Examples 9 and 11

The adhesion to the steel plates of the materials in accordance with Example 9 was tested with the material of Example 11 and it was found that the material of Example 11 (i.e. of the present invention) adhered much better to the metal plates compared to the sealant of Example 9.

The sealant of Example 11 was also tested for relative adhesion to cold rolled and galvanized steel, with the result that the material of Example 11 adhered better to the rolled steel plate than to the galvanized plate.

Example 12

The example describes the use of the β-cyclodextrin-benzoyl peroxide complex as a blowing agent as well as a curing agent for thermoplastics. The following product was prepared:

Preparation Quantity

A. Fusabond C-D198 (DuPont) 10 g of β-cyclodextrin-benzoyl peroxide complex

(10% benzoyl peroxide content) 1 g B. Fusabond C-D198 10 g C. Fusabond C-D198 10 g β-cyclodextrin (10% water) i g D. Fusabond C-D198 10 g benzoyl peroxide 0.1

Each of the compositions was mixed with heating and sheets of uniform thickness were extruded while still in the liquid state. Parts of exactly the same length and weight were cut from sheets and transferred to an oven at 200 ° C.

Upon stirring the uncomplexed benzoyl peroxide, this decomposed, as was evident from the formation of bubbles. This was not observed when mixing the benzoyl peroxide complex with β-cyclodextrin under the same conditions. In both formulations, the amount of benzoyl peroxide was the same. In the complexed state, the benzoyl peroxide was stabilized with stirring. It was also difficult to achieve uniform distribution of uncomplexed benzoyl peroxide during mixing.

The β-cyclodextrin-benzoyl peroxide complex is easy to mix and uniformly distributed as the composition is mixed.

Very severe differences were observed after heating. Composition D, containing uncomplexed benzoyl peroxide, cured very rapidly and did not spread across the surface to an apparent extent. The bubbles of the cured composition were not uniform in size or distribution.

Composition A, containing a cyclodextrin-benzoyl peroxide complex, also cured rapidly and also did not expand too much in the lateral direction. Bloating and curing occurred simultaneously. This composition rose higher than Sample D containing uncomplexed benzoyl peroxide. The bubbles in composition A were uniform in size and distribution.

Composition C expanded laterally much more than any other. The water released from the cyclodextrin gave rise to bubbles of uniform size and distribution. The water that was released acted as a traditional blowing agent, but there was no curing agent to cure the composition and delay its spread.

Composition B expanded laterally much more compared to compositions A and D, but not so much as composition C. There was no curing agent that delayed the spread of the composition and there was also no blowing agent to aid in this spillage.

Best results were obtained with composition A containing a complex of benzoyl peroxide and β-cyclodextrin. The benzoyl peroxide was stabilized so that it was released by heating to act as curing agents and blowing agents. This complex is also readily mixed and dispersed into the composition.

It is to be understood that we intend to protect all changes and modifications to the preferred embodiments of the present invention set forth herein to illustrate the process and do not depart from the scope of the present invention.

Claims (15)

A method of increasing the adhesive properties of a material, comprising: forming a composition comprising an adhesive and / or sealing plastic material and an effective amount of a cyclodextrin-blowing agent complex; and heating said composition so that the used plastic material flowing and the blowing agent expands said plastic material that is in a liquid state. The method according to claim 1, characterized in that, before forming said mixture, a step of forming a complex of the blowing agent used and said cyclodextrin is carried out. Method according to claim 1, characterized in that β-cyclodextrin is used as said cyclodextrin. The method of claim 1, wherein one or more of water, propylene glycol, dipropylene glycol, tripropylene glycol, ethylene glycol, cyclohexylamine, dicyclohexylamine and a peroxide are used as the blowing agent. 5. The method of claim 1, wherein about 1 to about 30 parts by weight of said complex is mixed into the plastic material used, calculated on the basis of about 100 parts by weight of the plastic material used. 6. A method, characterized in that increasing the adhesive properties of the adhesive and / or sealing materials comprises the steps of: (a) adding an effective amount of cyclodextrin to said adhesive and / or sealing material; and b) mixing said adhesive and / or sealing plastics material with cyclodextrin to form a mixture with increased adhesion. The method of claim 6, wherein said cyclodextrin is β-cyclodextrin. The method of claim 6, wherein the amount of said cyclodextrin that is added to the adhesive and / or sealing plastic is from about 1 to about 30 parts by weight per 100 parts of said plastic. The process according to claim 6, characterized in that said adhesive material is a copolymer of ethylene and vinyl acetate. Adhesive and / or sealant composition with increased adhesion, characterized in that it comprises an adhesive and / or sealant plastic material and an effective amount of cyclodextrin. Adhesive and / or sealing composition according to Claim 10, characterized in that an ethylene-vinyl acetate copolymer is used as the adhesive plastic material. The adhesive and / or sealing composition of claim 10, wherein said cyclodextrin is used in the adhesive composition in an amount of from about 1 to about 30 parts by weight, based on the weight of the plastic material used. Adhesive and / or sealing composition with improved adhesion, characterized in that it comprises an adhesive and / or sealing plastic material and an effective amount of a cyclodextrin-blowing agent complex. The adhesive and / or sealing composition according to claim 13, characterized in that said complex is contained in the composition in an amount by weight of from about 1 to about 30 parts, calculated on 100 parts of plastic material. The adhesive and / or sealing composition according to claim 13, characterized in that said blowing agent is in a complex in an amount of from about 1 to about 30 parts by weight, calculated per 100 parts of cyclodextrin.