Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1991-02-22
1992-06-09
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 68, 524 69, 524 70, 524 71, 10628404, 1062844, C08L 9500
Patent
active
051207770
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a bitumen/polymer composition exhibiting an adhesiveness which is retained on storage at elevated temperatures. It also relates to a process for the preparation of such a composition and to the application of this composition to the production of coatings and in particular of road surface dressings, asphalt mixes or seal coatings.
2. Description of the Related Art
Modification of bitumens by polymer addition plays a part in increasing the viscosity of the bitumen/polymer compositions obtained and ipso facto reduces the wettability of the said compositions or bitumen/polymer binders on the inorganic and organic surfaces in the event of nonconformance with the utilisation temperatures. This modification of the interfacial properties can be reflected in a decrease in the adhesiveness of the bitumen/polymer binder, due to the effect of water. In order to compensate for this defect, amino compounds are generally added to the bitumen/polymer composition before its use. However, the effectiveness of these amino compounds decreases very quickly after a few hours, disappearing completely after three or four days' storage between 150.degree. C. and 160.degree. C.
SUMMARY OF THE INVENTION
To overcome this disadvantage the invention proposes a bitumen/polymer composition modified with a nitrogen compound such as an amino compound, which is integrated irreversibly within the bitumen/polymer composition, which results in a bitumen/polymer composition exhibiting durable adhesive properties under the conditions of storage at temperatures of the order of 150.degree.-160.degree. C. usually employed for this composition.
The bitumen/polymer composition according to the invention is of the type comprising a bitumen and, based on the weight of bitumen, 0.5 to 15% of a polymer and 0.05 to 10% of an adhesion promoter consisting of one or more nitrogen compounds which have a molecular mass higher than 90 and are chosen from amines, amides, amidoamines, amine oxides, imidazolines, amine salts and imidazoline salts, and it is characterised in that the nitrogen compound(s) forming the adhesion promoter of the bitumen/polymer composition are grafted onto the polymer present in the said composition.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Advantageously, the nitrogen compounds from which the compound(s) forming the adhesion promoter of the bitumen/polymer composition are chosen, that is to say the component imparting the adhesiveness characteristics to the composition, are derivatives of general formula R--Z--R.sub.1 and their salts, with R in this formula denoting a C.sub.3 -C.sub.30 monovalent aliphatic hydrocarbon radical, Z denoting a divalent group chosen from ##STR1## where n denotes an integer ranging from 2 to 6 and preferably from 2 to 4, m denotes zero or an integer ranging from 1 to 6 and preferably from 1 to 4, and p is equal to zero or 1, and each of R.sub.1, R.sub.2 and R.sub.3, which are identical or different, denotes a hydrogen atom, a radical chosen from the radicals R, a C.sub.1 -C.sub.18 and preferably C.sub.1 -C.sub.12 alkyl, hydroxylalkyl or aminoalkyl radical or a radical --C.sub.q H.sub.2q O).sub.r H with q denoting an integer equal to 2 or 3 and r denoting an integer ranging from 2 to 10.
In particular, the radical R of the compounds R--Z--R.sub.1 which are defined above contains one or more unsaturations and may be especially an alkenyl, alkadienyl, alkatrienyl, alkatetraenyl or alkapentaenyl radical. The radical R is preferably chosen from those radicals R which contain 8 to 20 carbon atoms. Examples of radicals R which are suitable for the nitrogen compounds employed according to the invention are those such as 9-decenyl, 2,4-decadienyl, 2,4,6-decatrienyl, 9-dodecenyl, 9-hexadecenyl, 6-octadecenyl, 11-octadecenyl, 9,12,15-octadecatrienyl, 9,11,13,15-octadecatetraenyl, 6,9,12,15-octadecatetraenyl, 9-eicosenyl, 11-eicosenyl, 8,11,14,17-eicosatetraeny1,5,8,11,14-eicosatetraeny1,5,8,11,14,17-eicosape ntaenyl, 11-docosenyl, 13
REFERENCES:
patent: 1661828 (1928-03-01), Hopkinson
patent: 3359229 (1967-12-01), Chalex et al.
patent: 4162999 (1979-07-01), Bohemen
patent: 4242246 (1980-12-01), Maldonado et al.
patent: 4554313 (1985-11-01), Hagenbach et al.
patent: 4567222 (1986-01-01), Hagenbach et al.
Chaverot Pierre
Planche Jean-Pascal
ELF France
Michl Paul R.
Szekely Peter
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