FR2737084A1 - Spray contg. pine tar and terpenic alcohol(s) - used for treating wounds in trees and woody plants, partic. from pruning, prevents growth of harmful moulds and fungi, and does not contain CFC's - Google Patents

Abstract

Compsn. is a liq. soln. comprising 40-90% (pref. 60-80%) pine tar and 10-60% (pref. 20-40%) a mixt. of terpenic alcohols. Also claimed is an aerosol system comprising: (a) the above compsn.; (b) a container equipped with valve and plunger tube; and (c) a gas or gas mixt. as propellant. At 20[deg]C, the interior of the container is maintained at a pressure of 1-7 bar, (pref. 2-6 bar). Also claimed is a process for treatment of plant wounds, comprising pulverising on the wound surface 0.01-1 g/cm2 (pref. 0.02-0.5 g/cm2) of the liq. soln. above using the aerosol system.

Description

 Composition for protecting plant size wounds.

 The present invention relates to a new composition for aerosol, an aerosol generating system containing said composition and a method of treating woody plants using this same composition.

 Wounds that appear as a result of the pruning of woody plants, especially trees, are particularly susceptible to attack by diseases caused by mold or phytopathogenic fungi. Compositions are known which can be used for the protection of these wounds against such diseases, in particular compositions comprising pine tar.

 For example, compositions are known based on pine tar which can be applied directly, by brushing with a ready-to-use solution. Also known are such compositions applicable by aerosol.

In the present text, the term “aerosol” means a suspension of fine liquid particles in a gas or mixture of gases, and, by aerosol generating system, a device capable of producing such a suspension. An aerosol generating system generally comprises a housing, set with a valve equipped with a dip tube, a liquid intended to be sprayed and a gas or a mixture of gases, propellant of said liquid.

 These aerosol-applicable compositions are particularly appreciated by users for their convenience of use. However, they have some drawbacks.

 Indeed, these compositions often use a propellant gas of the chlorofluorocarbon (or CFC) or hydrochlorofluorocarbon (or HCFC) type. However, these hydrocarbons, because of their interaction with the biosphere, in particular the ozone layer, were subjected for some of them to a ban and for others to employment restrictions leading to a possible disappearance in the next years.

 On the other hand, due to the fact that the wounds to be treated are often in an essentially vertical plane or even inclined with respect to the horizontal, it frequently happens that the deposit comprising the pine tar obtained after spraying the aerosol on the surface of the woody plant to be treated, under the action of the force of gravity, has a sag, that is to say a flow or a runoff of said deposit.

 An object of the present invention is to remedy, in whole or in part, the drawbacks set out above.

 Another object of the present invention is to provide a liquid aerosol composition comprising pine tar and capable of being applied by spraying by means of an aerosol generating system whose propellant gas is other than a CFC or a HCFC.

 Another object of the present invention is to provide a liquid aerosol composition comprising pine tar and which, after spraying on a wound inclined to the horizontal remains in contact with said wound for as long as possible.

 Another object of the present invention is to provide a liquid aerosol composition comprising pine tar and which, after spraying on a wound inclined relative to the horizontal, does not give rise to sagging.

 Another object of the present invention is to provide an aerosol generating system or device which does not cause any environmental damage.

 It has now been found that these objects can be achieved, in whole or in part, by means of the aerosol generating compositions and systems or devices of the invention.

 In what follows, the percentages used are percentages by weight, unless otherwise specified.

 The aerosol compositions according to the invention are liquid solutions comprising from 40 to 90% of pine tar, preferably from 60 to 80% and from 10 to 60%, preferably from 20 to 40% of a mixture of terpene alcohols.

Pine tar means a cut or mixture of cuts coming from the distillation of pine wood, brown-black in color, and having at least one of the following 3 characteristics
- it distills from 100 C and decomposes around 450 "C,
- it has a viscosity at 97 "C of between 5 and 35 mPa.s, preferably between 10 and 30 mPa.s,
- It has a density at 20 "C of between 0.8 and 1.4 g / cm3, preferably between 1.0 and 1.3 g / cm3.

 It is specified that the term “mPa.s” means the unit of viscosity equal to 1 milliPascal.second, again equal to lcP.

The mixture of terpene alcohols which can be used in the compositions according to the invention can also be obtained by distillation of pine wood. n has one of the following characteristics
- it distills between 180 and 220 "C,
- it has a viscosity at 20 "C of 15 to 30 milliPascal.second, preferably 20 to 25 milliPascal.second,
- It has a density at 20 "C between 0.900 and 0.960 g / cm3, preferably between 0.920 and 0.940 g / cm3.

 The compositions according to the invention are particularly advantageous due to the fact that, when they are applied in the form of an aerosol obtained by means of a propellant gas other than a CFC or an HCFC, such as tetrafluoroethane, they do not give little or no sagging.

 More particularly, a deposit of 6 g of composition according to the invention, obtained by the application of an aerosol generating system using tetrafluoroethane as propellant on a plywood surface inclined by 80 "relative to the horizontal, said system being placed at a distance of 30 cm from said surface, gives rise to a run-out in a time greater than 1 min, preferably greater than 5 min.

 According to another aspect of the invention, the liquid aerosol solutions when they are maintained, by means of the device described below, at a temperature of 20 "C and under a pressure of 6 bars, further comprise from 25 to 45% tetrafluoroethane in the liquid state, preferably 35 to 45%.

This variant is advantageous because the gas in the liquid state, distributed homogeneously in the liquid solution, makes it possible to compensate for the reduction in pressure in the housing which results from the use of the aerosol generating system. It thus ensures prolonged and regular operation throughout the period of use and ensures total emptying of the container.

 Finally, the compositions according to the invention may also contain other additives known per se and used for the formulation of aerosols, such as: anti-corrosion agent, dye, odorous substance, film-forming agent, thickening agent.

 The compositions according to the invention are prepared by simple mixing of the components, at room temperature.

The invention also relates to an aerosol generating system comprising:
- a liquid solution as described above,
- a housing, which is set with a valve fitted with a dip tube,
- A gas, or mixture of gases, propellant of said liquid solution and maintaining inside the housing for a temperature of 20 "C a pressure between 1 and 7 bars, preferably between 2 and 6 bars.

According to a preferred embodiment, the propellant of the aerosol generating system according to the invention is tetrafluoroethane. The use of this gas as propellant is particularly advantageous in that it avoids the use of halogenated hydrocarbons, such as chlorofluorocarbons (or
CFC) and hydrochlorofluorocarbons (or HCFCs), or even the use of saturated hydrocarbons, such as propane or butane. Saturated hydrocarbons cause, due to their characteristics of combustibility and explosiveness, problems of safety in use. The aerosol generating systems according to the present invention therefore offer improved safety both environmentally and for the consumer.

 The volume of liquid solution contained in the casing of the aerosol generator system according to the invention is 55 to 80% by volume, preferably 60 to 75% by volume.

 The aerosol generating systems according to the invention are obtained by filling a housing with a composition according to the invention according to techniques known per se to those skilled in the art.

 A subject of the invention is also a method for treating pruning wounds of woody plants, characterized in that 0.01 to 1 g / cm 2, preferably 0.02 to 0, is sprayed onto the wound surface. , 5 g / cm2 of a composition according to the invention, by means of an aerosol generating system as described above.

 The aerosol generating compositions and systems according to the invention are illustrated in the following examples which are given without limitation.

In these examples, the pine tar used is a brown-black liquid, which has the following characteristics
- it distills from 100 "C and decomposes around 450" C,
- it has a viscosity at 97 "C equal to 20 mPa.s,
- it has a density at 20 "C equal to 1.2 g / cm3.

The mixture of terpene alcohols used is a slightly amber colored liquid which has the following characteristics
- it distills between 180 and 220 "C,
- it has a viscosity at 20 "C equal to 22 mPa.s.

 - it has a density at 20 "C equal to 0.934 g / cm3.

Examples:
A liquid solution containing the following amounts of the components is prepared by simple mixing
pine tar: 68%
mixture of terpene alcohols: 32%
An aerosol generator system is prepared as follows.

157 ml of the previously prepared liquid solution, corresponding to a weight of 170 g, are introduced into a metal container of 250 ml of useful volume. A valve fitted with a polyethylene dip tube is introduced, said valve having a nozzle orifice with a diameter of 0.5 mm and a valve body of 2 mm. The housing is hermetically sealed by means of a crimping head. We weigh the whole and measure a weight of 240 g. A quantity of tetrafluoroethane equal to 113 g is measured, measured by weighing the entire containerization system under a pressure of 6 bar, by means of a female valve adapting to the valve described above. A push button fitted with a 0.33 mm spray nozzle is fitted on the nozzle. The tetrafluoroethane content in the liquid state present in the liquid solution under these conditions is 40%.

 This aerosol generator system is applied by holding it at a distance of 30 cm from a plywood plate inclined by 80C with respect to the horizontal. Spraying is carried out for 3 seconds, which corresponds to a deposit of composition according to the invention estimated at 6 g.

 After 5 min, no flow of the deposit is observed.

Example 2:
A liquid solution containing the following amounts of the components is prepared by simple mixing:
pine tar: 82%
mixture of terpene alcohols: 18%
An aerosol generating system is prepared by proceeding as in Example 1. The weight of liquid solution introduced corresponding to 157 ml is 173 g. The weight of tetrafluoroethane introduced is 115 g.

 This aerosol generator system is applied by holding it at a distance of 30 cm from a plywood plate tilted 80 "from the horizontal. Spraying is carried out for 3 s, which corresponds to a deposit pine tar estimated at 6 g.

 After 3 min, no flow of the deposit is observed.

Example 3:
A liquid solution containing the following amounts of the components is prepared by simple mixing:
pine tar: 50%
mixture of terpene alcohols: 50%
An aerosol generating system is prepared by proceeding as in Example 1. The weight of composition introduced corresponding to 157 ml is 166 g. The weight of tetrafluoroethane introduced is 110 g.

 This aerosol generator system is applied by holding it at a distance of 30 cm from a plywood plate tilted 80 "from the horizontal. Spraying is carried out for 3 s, which corresponds to a deposit pine tar estimated at 6 g.

 After 2 min, no flow of the deposit is observed.

Claims (7)

 1. Liquid solutions comprising from 40 to 90% of pine tar, preferably from 60 to 80%, and from 10 to 60%, preferably from 20 to 40%, of a mixture of terpene alcohols.  2. Liquid solutions according to claim 1, characterized in that a deposit of 6 g of said solutions, obtained by means of an aerosol generating system using tetrafluoroethane as propellant on a plywood surface inclined by 80 "by compared to the horizontal, said system being placed at a distance of 30 cm from said surface, gives rise to a run-out in a time greater than 1 min, preferably greater than 5 min.  3. Liquid solutions according to one of claims 1 or 2, characterized in that they comprise from 25 to 45% of tetrafluoroethane in the liquid state, preferably from 35 to 45%.  4. Aerosol generator system including  - a liquid solution according to one of claims 1 to 3,  - a housing, set with a valve fitted with a dip tube,  - A gas, or mixture of gases, propellant of said liquid solution and maintaining inside the housing for a temperature of 20 "C a pressure between 1 and 7 bars, preferably between 2 and 6 bars.  5. Aerosol generator system according to claim 4, characterized in that the propellant is tetrafluoroethane.  6. Aerosol generator system according to one of claims 4 or 5, characterized in that the volume of liquid solution contained in the housing is equal to 55 to 80% by volume, preferably from 60 to 75% by volume.  7. A method for treating pruning wounds of woody plants, characterized in that 0.01 to 1 g / cm 2 is preferably sprayed onto the wound surface, preferably from 0.02 to 0.5 g / cm 2 d 'A solution according to one of Claims 1 to 3, by means of an aerosol generating system according to one of Claims 4 to 6.