JP2743035B2 - Improved adhesives and sealants - Google Patents

Description

The present invention relates to adhesives and sealants, and more particularly to a process for improving the adhesive properties of adhesives and sealants, and to adhesives and sealants that exhibit improved adhesive properties.

The present invention has been found to be particularly useful for foaming adhesives and sealants that have traditionally used foaming agents.

A blowing agent is a foaming age
Also referred to as nt) are substances that produce a cellular structure in a fluidized plastic or rubber compound. Conventionally known blowing agents include fluorocarbon, nitrogen gas, hydrazine derivatives, trihydrazide triazine, 5-phenyltetrazole, p-toluenesulfonyl semicarbazide, modified azodicarbonamide, and azodicarbonamide. Chemical blowing agents are a type of blowing agent that is solid or liquid at room temperature and generates gas when heated. A well-known chemical blowing agent is Uniroy
al, Inc., sold under the trademark CELOGEN.

Blowing agents are used in the manufacture of many consumer products and automatic sealants. In addition, blowing agents are used with the adhesive plastic material in the hot melt adhesive. Blowing agents are also used in food packaging applied to the exterior of an animal before the animal is slaughtered and shipped. Such products are sometimes called "bone wraps."

Chemical blowing agents are commonly used by mixing the chemical blowing agent with a solid plastic material and then heating the mixture under pressure. Heating causes the plastic material to be in a fluid state, so that the blowing agent generates gas. This gas generates bubbles, ie, cells, in the flowing plastic material.

Chemical blowing agents have an advantage over gaseous blowing agents in that they can be added to the solid plastic material before heating. Gaseous blowing agents such as nitrogen and some fluorocarbons must be injected into the fluidized plastic material. In the case of hot melt adhesives and sealants, a gas is mixed with the adhesive components prior to nozzle operation.

When fluorocarbons are used as blowing agents, they are well monitored due to their effects on earth's ozone. Other conventional blowing agents have problems in operability, toxicity, flammability, and the like. The problem of operability is storage stability,
Dust, explosion hazard, etc.

It has been found by the present invention that the use of cyclodextrins in the composition of the polymerized sealants and adhesives improves the adhesive properties of these sealants and adhesives. In addition, it has been found that cyclodextrin and blowing agent complexes not only improve the adhesive properties of the adhesive or sealant, but also function as blowing agents in fluidized adhesive and / or sealant plastic materials. Cyclodextrin has been found to stabilize blowing agents. It has also been found that certain chemical compounds can be used as blowing agents that have not heretofore been used as blowing agents.

The process according to the invention consists of mixing the polymerized adhesive or sealant plastic material with the cyclodextrin and then applying this mixture to the surface. In the case of an effervescent sealant or adhesive, the process according to the invention produces a mixture consisting of a polymerized adhesive and / or sealant plastic material and a complex of a blowing agent and cyclodextrin, which is heated and Fluidizing the material and releasing gas from the complex. The gas forms gas bubbles in the fluidized plastic material.

The step of forming a complex of the cyclodextrin and the blowing agent is performed before the step of mixing the complex with the plastic material.

The step of heating the mixture is usually performed by applying heat to the mixture, as in a conventional extrusion or blow molding process, or by an exothermic reaction, which typically occurs when using polyurethane.

The adhesive and / or sealant formulation produced in accordance with the present invention is comprised of a polymerized adhesive and / or sealant plastic material and a complex of a blowing agent and cyclodextrin. As mentioned above, the adhesive properties of the sealant or adhesive formulation are improved by the presence of cyclodextrin in the formulation. Thus, the cyclodextrin acts not only as a host for the blowing agent, but also as a reagent or means to improve the bond strength or tackiness of the sealant or adhesive.

The amount of cyclodextrin added to the polymerized adhesive and / or sealant plastic material is an amount effective to improve the adhesive and / or sealant adhesion. Preferably, the amount of cyclodextrin added to the polymerized adhesive and / or sealant plastic material to improve adhesion is 100 parts of the polymerized adhesive and / or sealant plastic material (ph
about 1-30 parts by weight based on p). More preferably, about 1-15 php of cyclodextrin is added to the polymerized adhesive and / or sealant plastic material to improve its adhesion. Most preferably, about 1
About 10 php of cyclodextrin is added to the polymerized adhesive and / or sealant plastic material to improve the adhesive. The amounts listed here are also the amounts of the complex of cyclodextrin and blowing agent added to the polymerized adhesive and / or sealant plastic material according to the invention.

A blend of cyclodextrin with polymerized adhesive and / or sealant plastic material, or a complex of cyclodextrin and blowing agent, with polymerized adhesive and / or
Or, to form a blend of sealant plastic materials, conventional mixing procedures commonly performed with adhesive and / or sealant materials may be used.

Cyclodextrins, also referred to as “Schardingers dextrins”, cycloamyloses, cyclomaltose, and cycloglucans are oligomers of anhydrous glucose that are linked by α1,4 bonds to form cyclic compounds. The six-membered ring is called α-cyclodextrin, the seven-membered ring is called β-cyclodextrin, and the eight-membered ring is called γ-cyclodextrin. These six-, seven-, and eight-membered rings are also referred to as cyclomaltohexaose, cyclomaltoheptaose, and cyclomaltooctaose, respectively.

Conventionally, cyclodextrin is obtained by treating a starch slurry with an enzyme or acid to produce a gel and liquefied slurry with a DE between 1 and 5. Next, the gelled liquefied starch slurry is treated with the selected cyclodextrin glucosyltransferase (CGT) at the appropriate pH, temperature, and time for the CGT. Enzyme C
GT is Bacillusmacerans, B.magneterium, B.circulan
s, B. stearothermophilus, and Bacillus sp. (alka
lophilic). Next, the digest obtained from the treatment of the gelled liquefied starch slurry by CGT is processed by a separation and purification process to obtain cyclodextrin.

One of the commercially important aspects of cyclodextrin is that
It can act as an inclusion compound or host for other commercially available compounds. Cyclodextrin is physically in the form of a donut. As a result, the cyclodextrin can act as an inclusion compound with a substance having an external dimension corresponding to the diameter of the cyclodextrin cavity.

The outside is often modified by adding a side chain, such as hydroxy-propylcyclodextrin, to the donut exterior of the cyclodextrin. The term "cyclodextrin" as used herein and in the claims.
Means not only cyclodextrin itself, but also modified cyclodextrins and branched cyclodextrins.

Also, as used herein and in the claims, the term "complex" or the expression "complex of cyclodextrin and a blowing agent" refers to a cyclodextrin and a blowing agent in which the cyclodextrin acts as a host for the blowing agent. In addition to the configuration described above, the blowing agent is closely related to the outer part of the cyclodextrin by a weak binding force.

The method of forming the complex between the cyclodextrin and the blowing agent includes dissolving the blowing agent and the cyclodextrin in water,
There is a method of collecting the formed precipitate.

As another method, there is a method in which cyclodextrin and a foaming agent are charged into a ball mill and ground for a certain period of time.
After this milling, a complex is formed between the cyclodextrin and the blowing agent. Other known methods of forming a complex between the cyclodextrin and the guest molecule include kneading, lyophilization, and co-milling. Good results have been obtained by co-milling with a mortar and pestle.

Suitably, the cyclodextrins used in the present invention are α, β, or γ cyclodextrins. β-cyclodextrin is preferred because it is commercially available.
Complexes formed from combinations of all three cyclodextrins open the blowing agent at different rates. This is believed to be due in part to the different bond strengths between the blowing agent and the different cyclodextrins.

Suitable blowing agents include water and liquids such as propylene glycol, dipropylene glycol, tripropylene glycol, cyclohexylamine, dicyclohexylamine, and ethylene glycol, as well as solids such as benzoyl peroxide and other difficult to process peroxides. ing. The usefulness of water and propylene glycol, dipropylene glycol, tripropylene glycol, and ethynylene glycol as blowing agents is surprising and unexpected. Conventionally, water, propylene glycol, dipropylene glycol, tripropylene glycol, and ethylene glycol have not been used as foaming agents because of their poor dispersibility in plastic materials. Solids such as benzoyl peroxide are difficult to treat because of their low decomposition temperatures. Water and propylene glycol are considered safe for humans and non-toxic. Many of the conventional blowing agents are toxic to humans. The use of such non-toxic blowing agents on site provides some safety to previously unknown sites. By using a combination of two or more blowing agents, such as water or propylene glycol, or by using different cyclodextrins with the same blowing agent, the application temperature of the blowing agent changes.

Furthermore, conventional chemical blowing agents such as hydrazine derivatives and trihydrazide triazine, 5-phenyltetrazole, p-toluenesulfonyl semicarbazide, modified azodicarbonamide, and azodicarbonamide, which form complexes with cyclodextrins, are used in accordance with the present invention. It may be used as a foaming agent. Complexing with cyclodextrin, conventional blowing agents reduce dust formation and stabilize the formulation.

The amount of the blowing agent when forming a complex with cyclodextrin is based on 100 parts by weight of cyclodextrin (phc).
About 1 to about 30 parts by weight. More preferably, about 3 to 15 ph
c is blended. Most preferably, about 5 to about 7 pfc of the blowing agent and cyclodextrin are combined.

In forming a complex between the cyclodextrin and the blowing agent, an excess amount of the blowing agent is used for complex formation.

A suitable source of a complex of cyclodextrin and water is
It has been found to be an industrially obtained cyclodextrin. Generally, cyclodextrins obtained from industrial processes contain about 10 to about 12 pph of water. With commercially available cyclodextrin in the adhesive formulation, about 10 to about
It was found that it forms a complex with 12phc of water, acts as a blowing agent and generates sufficient gas when heated.

In general, it has been found that the lower the flow rate of the complex, the more uniform the bubble size. Good results have been obtained with a complex of cyclodextrin and blowing agent with a particle size capable of passing through 200 mesh.

Suitable polymerized plastic materials include polymers such as polystyrene and polyvinyl chloride, polyethylene, polyurethane, polyphenols, polypropylene, polyisoprene (rubber), polybutadiene, and acrylonitrile-butadiene-styrene, styrene-isoprene, ethylene-butylene, There are copolymers such as styrene-butadiene rubber and ethylene vinyl acetate (EVA). In particular, ethylene vinyl acetate (EVA), acrylonitrile-butadiene-styrene and styrene-isoprene are used as adhesive plastic materials. Good results have been obtained using the complexes of the present invention with EVA.

A typical adhesive produced according to the present invention comprises:

Parts by weight EVA 25-50 modified resin 25-60 wax 0-30 total adhesive plastic material 100 antioxidant 0.05-0.5php filler 0-100php blowing agent-cyclodextrin complex 1-10php bookbinding produced by the present invention The adhesive consists of:

Parts by weight EVA 35-45 Modified resin 20-30 Plasticizer 20-30 Wax 10-20 All plastic adhesive materials 100 Antioxidant 0.05-0.25php Blowing agent-cyclodextrin complex 1-10php Anti-fungal agent (optional) 1 Preferably, the blowing agent-cyclodextrin complex is a water-cyclodextrin complex, containing between about 8 and about 15 pfc of water. More preferably, the amount of complex used in the bookbinding adhesive is between about 3 and about 7 pfc and has a water content of about 10 to about 15 pfc.

The use of a microorganism or antifungal agent complexed with cyclodextrin incorporated into the adhesive aids in preventing its degradation. Water acts as a blowing agent and aids in the release of microorganisms or fungicides.

Bookbinding adhesives are manufactured by mixing all the components together in a conventional manner.

The application temperature of such an adhesive is from about 120 to about 205 ° C.

The use of a complex of water and cyclodextrin has been found to have several advantages over the prior art with liquid nitrogen. Current equipment for hot melt application for bookbinding requires specific equipment that uses liquid nitrogen.

In the case of the cyclodextrin-water complex of the present invention, a wide range of equipment can be used. In addition, the open time is increased, a wider surface contact is obtained, and less adhesive is required to cover the same area.

According to the present invention, the adhesive for sealing the manufactured carton and case has the following composition.

Parts by weight EVA 40 modified resin 40 wax 20 all plastic adhesive material 100 antioxidant 0.01 php blowing agent-cyclodextrin complex 1-10 php Preferably, the blowing agent-cyclodextrin complex is a propylene glycol-cyclodextrin complex, 8
And between about 15 pfc of propylene glycol. Preferably, about 3 to about 7 php complexes having a propylene glycol content of about 10 to about 13 pph are used.

The adhesive that seals the carton or case is produced by mixing all components in a conventional manner.

The adhesive to seal such carton or case is about 17
It has an application temperature between 5 and about 205 ° C.

The backing adhesive for carpets manufactured according to the present invention has the following composition:

Parts by weight EVA 25-50 Modified resin 25-60 Wax 0-30 All plastic adhesive material 100 Antioxidant .05-0.5php Filler 0-100php Foaming agent-cyclodextrin complex 1-10php For carpet backing adhesive The blowing agent-cyclodextrin complex used is a complex of cyclodextrin with about 8 to about 15 pph of either water, propylene glycol or a combination of water and propylene glycol or a combination of water, propylene glycol, and a hydrazine derivative.

In addition, such carpet backing adhesives suitably contain up to about 1 php of the complex of cyclodextrin and the fungicide. A suitable fungicide is diiodomethyl-
Preferred are diiodomethyl-p-trisulfones, including P-trisulfone, phenols and butylhydroxytoluene, the release of which is triggered by the water released by the cyclodextrin.

Carpet backing adhesives are produced by mixing all components in a conventional manner. The application temperature of this carpet backing adhesive is between about 300 and 350 Fahrenheit.

The presence of cyclodextrin in these various adhesives and sealants also acts to increase the adhesive properties of the sealant or adhesive formulation.

The addition of a small amount of an enzyme, known as an amylase, to the effervescent plastic formulation of the present invention, when heated, acts as a catalyst that promotes the release of the effervescent agent from the cyclodextrin. In order for amylase to act as a catalyst,
A small amount of water must be present in the plastic formulation. It is believed that this amylase uses water to destroy cyclodextrin, thereby promoting release of the blowing agent.

Other compounds including fungicides, fungicides, and fragrances can be added to the plastic material containing the foaming agent of the present invention.

The above and other aspects of the present invention will be more fully understood by the following examples.

Example 1 This example shows a hot melt adhesive according to the invention, and in particular a bookbinding adhesive.

Bookbinding material parts by weight EVA-507 45 Staybelite resin 25 Pentalyn H 20 Microcrystalline wax 10 All plastic bookbinding material 100 0.1 php antioxidant and 10 php water-β cyclodextrin complex were added to the adhesive plastic material. This complex is combined with 7.5 grams of β-cyclodextrin
Consists of 2.5 grams of water. The water formed a complex with the water 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 temperature water moves from the liquid phase to the gas phase, which results in the foaming of the adhesive. It is. The volume expansion percentage of the adhesive is about 100%
Met.

EVA-507 was a commercial grade ethylene-vinyl acetate copolymer obtained from Union Carbide Corp. Staybelite resin is a hydrogenated resin, and Herc
Plasticizer consisting of diethylene glycol ester of hydrogenated resin obtained from ules Powder Co. Pental
ynH was a synthetic resin obtained from hercules Powder Co. Microcrystalline wax from Petrol, Tulsa, Okla.
It was a commercially available wax from ite Corp. The antioxidant was Irganox 1010 from Ciba-Geigy Corp. β-cyclotextrin was a commercial-grade β-cyclodextrin obtained from the American Maize-Products Company, Hammond, Indiana. The water was normal tap water.

The use of a cyclodextrin-water complex in the above formulation is surprising and unpredictable because water does not itself act as a blowing agent in the bookbinding adhesive.

Example 2 This example illustrates a method for making a carton case adhesive according to the present invention. The following bonding compositions were used:

Material parts by weight EVA-305 40 CKM-2400 15 piccolyte A-115 12.5 Super STATAC 12.5 Polywax 1000 10 castor wax 10 All plastic adhesive material 100 For adhesive plastic material, 0.1 php antioxidant and 10 php propylene glycol-β cyclo The dextrin complex was mixed. The complex contained 1 mole of β-cyclodextrin and 2 moles of propylene glycol. Complexes of propylene glycol and β-cyclodextrin were prepared by mixing β-cyclodextrin with excess propylene glycol.

The mixture of adhesive material, antioxidant, and propylene glycol-β-cyclodextrin complex was heated. Propylene glycol transitions from a liquid state to a gaseous state,
This resulted in expansion of the adhesive composition. The composition of the adhesive is about 100 with the blowing agent and propylene glycol.
% Volume expanded.

EVA-305 is ethylene- obtained from Union Carbide.
It was a commercial grade copolymer of vinyl acetate. CK
M-2400 was obtained from Union Carbide. PiccolyteA-1
15 was a thermoplastic terpene resin obtained from Heacules. Super STATAC was obtained from Reichold Chemical Inc. Polywax1000 is obtained from Bareco and also Castor
The wax was obtained from Universal Preservachems. The antioxidant used was Irganox1010. Beta cyclodextrin from American Maize-Produ, Hammond, Indiana
Commercial brand beta cyclodextrin obtained from cts Company. Propylene glycol is Dow Chemical
It was a commercial brand obtained from.

The formulation used a complex of propylene glycol and cyclodextrin, which was surprising and unpredictable because propylene glycol itself did not act as a blowing agent.

Example 3 This example illustrates a method for making a carpet backing adhesive according to the present invention. The following adhesive composition was used.

Material parts by weight EVA 50 Modified resin 40 Wax 10 All plastic adhesive material 100 Antifungal agent (optional) 1-10php For adhesive plastic material, 0.1php antioxidant, about 20php filler, and 5php water And β-cyclodextrin complex were added along with 5 parts of propylene glycol-β-cyclodextrin complex. A complex of blowing agent and cyclodextrin is formed according to Examples 1 and 2 above. The complex of blowing agent and cyclodextrin is simultaneously mixed with the adhesive composition according to Examples 1 and 2 above.

When the mixture of the adhesive composition and both blowing agents is heated to 195 ° C., the adhesive mixture expands.

EVA is a commercial grade copolymer of ethylene-vinyl acetate. The modified resin is a commercial grade wood rosin. The wax is a commercial grade wax conventionally used in carpet backing adhesives. Antioxidant is Irgonox1010
And the filler is conventional calcium carbonate.

Example 4 This example illustrates a method for making a pressure sensitive adhesive according to the present invention. The following adhesive composition was used.

Material parts by weight EVA 501 15 EVA 605 30 Staybelite Ester10 37 Abitol 18 All plastic adhesives 100 For adhesive materials, 0.1 php antioxidant, Irgano
x1010, 5php complex of water and β-cyclodextrin, 5php
Of cyclohexylamine and β-cyclodextrin were added. Water and β-cyclodextrin complex contained 12.8phc water. The complex of β-cyclodextrin with clohexylamine, a volatile corrosion inhibitor, contained 8phc of cyclohexylamine complexed with cyclodextrin. Complex formation and mixing of the adhesive composition was done according to Example 1.

The released water provided a "trigger" mechanism whereby the complexed cyclohexylamine was partially released to equilibrate with the water released from the water-cyclodextrin complex. Such a mechanism provided corrosion protection for the metal surface. The complex of cyclodextrin and cyclohexylamine stabilizes cyclohexylamine during the heating step. Uncomplexed cyclohexylamine is not stable when the adhesive is heated. EVA501 and 605 are U
It was a commercial grade copolymer of ethylene-vinyl acetate obtained from Nion Carbide. StaybeliteEster
10 and Abitol were obtained from hercules. The application temperature of the adhesive was about 300 F (Fahrenheit) to 325 F (Fahrenheit).

Example 5 This example illustrates a method for making a foamable, curable sealant according to the present invention.

A.- hot melt base component unit (commercially available from Shell) kraton FC 1901x 100 Regalrez 1018 ( commercially available from Hercules) 270 Endex 155 (available from Hercules) 50 Irganox 1010 (available from CibaGeigy) 1 B.- plasticizer over based sulfonate Calcium (commercially available from Witco) 10 β-cyclodextrin: dicyclohexylamine complex (2: 1 molar ratio) 2 Aluminum paste (50:50 aluminum in Sunpar 2280 obtained from SunOil) 1 β-cyclodextrin (10-13% H ₂ O) 2 Equal amounts of hot melt base and plasticizer were mixed, allowed to cool, and placed on cold rolled steel sheets or galvanized cold rolled steel sheets. The steel sheet is placed in the furnace and 200 minutes for 15 minutes
Heated to ° C. The material expanded on the plate in vertical and horizontal planes to double the volume of the mixture.

Example 6 From Example 5 above, 50 parts of a hot melt based mixture was mixed with 50 parts of overbased calcium sulfonate. The overbased calcium sulfonate was heated and the water was allowed to evaporate before mixing it with the hot melt base. The mixture was placed on an inter-rolled steel sheet and a cold galvanized steel sheet and heated in a furnace at 200 ° C. for 15 minutes. The mixture melted on heating and spread on the plate without swelling.

Comparison of the adhesives of Examples 5 and 6 The material produced according to Example 6 above was tested for adhesion to cold rolled and galvanized steel against the material produced according to Example 5 above. The cured material of Example 5 above adhered much more strongly to the cold rolled and galvanized steel sheets than the material of Example 6. The material of Example 6 could be easily peeled from the steel plate, but the material produced according to Example 5 (invention) above did not.

Example 7 Produced with the same mixture as in Example 6 above. The difference is that water was not removed from the overbased calcium sulfonate before placing and mixing the overbased calcium sulfonate in a furnace at 200 ° C. on a cold rolled steel sheet and a cold galvanized steel sheet. The mixture of this example simply cured properly. Hardening was accelerated due to the release of water, as evidenced by the lack of flow or deformation of the material placed on the steel plate.

Example 8 The same mixture as in Example 5 above was produced. However, cooling of the mixture was not allowed. The mixture was placed on cold rolled steel sheets and cold galvanized steel sheets and then placed in a 200 ° C. furnace. The volume of this material expanded about twice. A blowing agent (water) was present in the cyclodextrin and was released on heating with cyclohexylamine (a vapor phase corrosion inhibitor). In cyclodextrin, the water is controlled and does not harden until its opening is triggered by sufficient heating.

Example 9 A conventional sealant was made from the following ingredients:

Ingredients -Formulation A Part Kraton RD 6501 (commercially available from Shell) 100 Regalrez 1018 (commercially available from Hercules) 270 Endex 155 (commercially available from Hercules) 50 Irganox 1010 (commercially available from Ciba-Geigy) 1 It was placed on a cold rolled steel plate and placed in a furnace at 200 ° C. for 15 minutes. This material was melted and spread on a plate.

Example 10 In this example, Formulation A produces a sealant according to the present invention.

Component Part Formulation A 10 β-cyclodextrin (10-13% water) 2 These components were mixed, placed on a cold-rolled steel plate or a cold-rolled steel plate, and placed in a furnace at 200 ° C. for 15 minutes. The volume of the sealant expanded, but did not expand to 100% of its initial volume.

Comparison of Adhesion of Examples 9 and 10 The adhesion of the material produced according to Example 9 to a steel plate was tested against the adhesion of the material produced according to Example 10. The sealant of Example 10 (invention) was found to adhere better to the steel sheet than the sealant of Example 9.

The sealant of Example 10 was also tested for relative adhesion between the cold rolled steel sheet and the galvanized steel sheet. The sealant of Example 10 adhered better to cold rolled steel than to galvanized steel.

Example 11 This example illustrates the use of another chemical blowing agent that forms a complex with cyclodextrin.

Component part mixture A 10 β-cyclodextrin phosphorus dibutyltin dilaurate complex (24% chemical blowing agent) 2 β-cyclodextrin (10-13% water) 2 After mixing, these components are placed on a cold-rolled steel plate or a cold-rolled steel plate And placed in a 200 ° C. oven for 15 minutes.
This material also expanded to about 100% of its initial volume when heated.

Comparison of the Adhesion of Examples 9 and 11 The adhesion of the material produced according to Example 9 to a steel plate was tested against the adhesion of the material produced according to Example 11. The sealant of Example 11 (invention) adhered better to the steel sheet than the sealant of Example 9.

The sealant of Example 11 was also tested for relative adhesion between the cold rolled steel sheet and the galvanized sheet. The sealant of Example 11 adhered better to cold rolled steel than to galvanized steel.

Example 12 This example shows an example in which a complex of β-cyclodextrin and benzoyl peroxide is used as a curing agent and a foaming agent for a thermoplastic resin. The following formulation was produced:

The amount A.Fusabond C-D198 (available from DuPont) 10 g benzoyl beta cyclodextrin complex (10% benzoyl peroxide) of peroxide 1g B.Fusabond C-D198 10g C.Fusabond C -D198 10g β -cyclodextrin (10% water) 1 g D. Fusabond C-D198 10 g Benzoyl peroxide 0.1 g Each formulation was mixed with heating while the fluid was extruded in sheets of uniform thickness. Equal length, equal weight sections were cut from the sheet and placed in a 200 ° C. oven.

During mixing of the uncomplexed benzoyl peroxide, decomposition of the benzoyl peroxide occurred, as evidenced by the formation of bubbles. This was not observed when mixing the complex of benzoylperoxide and β-cyclodextrin under similar conditions. The amount of benzoyl oxide was equal for both complexes. In the complexed state, the benzoyl peroxide was stabilized upon mixing. It was difficult to evenly distribute benzoyl peroxide that did not form a complex during mixing. Β when mixing the formulation
The cyclodextrin-benzoyl peroxide complex was easily mixed and distributed evenly.

After heating, a very noticeable difference was found. Formulation D containing uncomplexed benzoyl peroxide
Cured very quickly and did not spread significantly in the lateral direction. The bubbles in the cured formulation were not uniform in size and distribution.

Mixture A, which contains a complex of benzoyl peroxide and β-cyclodextrin, also hardened rapidly and did not develop significantly in the lateral direction. Foaming and curing occurred simultaneously.
This formulation rose higher than Sample D, which contained uncomplexed benzoyl peroxide. The cells in Formulation A had a uniform size and distribution.

Formulation C developed more laterally than any of the other formulations. The water released from the cyclodextrin formed bubbles of uniform size and distribution. The released water acted as a conventional blowing agent, but there was no curing agent to cure the formulation and delay deployment.

Formulation B developed more laterally than Formulations A and D, but not as much as Formulation C. There were no hardeners to delay deployment and no blowing agents to increase deployment.

Good results have been obtained from Formulation A, which contains a complex of benzoyl peroxide and β-cyclodextrin.
Benzoyl peroxide was stabilized and released on heating, acting as a hardener and blowing agent. The complex was easily mixed and dispersed in the composition.

It is intended to cover all modifications and variations of the preferred embodiment of the present invention selected for explanation without departing from the spirit and scope of the present invention.

Claims (2)

(57) [Claims] 1. A method for increasing the adhesive strength of a material, comprising forming a mixture comprising a polymerized adhesive plastic material and / or a sealant plastic material and a complex of cyclodextrin and a blowing agent, wherein the plastic material is a fluid And heating the mixture such that the blowing agent expands the plastic material in this fluidized state. 2. A method for increasing the adhesive strength of a material, the method comprising forming a mixture comprising a polymerized adhesive plastic material and / or a sealant plastic material and a complex of cyclodextrin and water, wherein the plastic material is fluidized. And heating the mixture such that the water expands the plastic material in this fluidized state.