Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1986-05-08
1989-05-09
Seccuro, Carman J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524 69, 524 70, 525222, 525 545, C08L 9500, C08L 3104, C08L 2312, C08L 2316
Patent
active
048291099
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to polymeric compositions suitable to be used as agents for bitumen modification, as well as to the so modified bituminous compositions.
2. Description of the Prior Art
The use is known of bituminous compositions, as sheaths, in the water-proofing of civil and industrial buildings. Such compositions are prevailingly constituted by bitumen of the distillate type, and generally contain modifier agents which improve their physical-mechanical characteristics--in particular, their resistance to high-temperature penetration and their low-temperature flexibility. Such agents are generally constituted by amorphous polypropylene (in amount of from 20 to 30% by weight), possibly in combination with amorphous or low-crystallinity olefinic copolymers having low molecular weight.
THE PRESENT INVENTION
The Applicant has found now that it is possible to confer to bitumens improved characteristics of low-temperature flexibility and of strength to high-temperature penetration, by using a modifier agent consisting of a polymeric composition comprising, by weight: 60 to 75% by weight of ethylene, and having a value of Mooney viscosity (ML 1+4) at 100.degree. C. higher than 5 and preferably comprised within the range of from 8 to 40; macromolecules having M.I. greater than 1 and preferably comprised within the range of from 5 to 15; with amorphous copolymers of ethylene with propylene, such component (c) having a total combined ethylene content lower than 60% by weight, and intrinsic viscosity (in tetralin at 135.degree. C.) lower than 2 dl/g and preferably comprised with the range of from 0.1 to 1; g/cm.sup.3, and having a value of M.I. higher than 5 and preferably comprised within the range of from 10 to 30; to 95% by weight of ethylene, having a value of M.I. higher than 0.1, and preferably comprised within the range of from 0.5 to 200; d and the component e are each present in an amount greater than 15% by weight, the sum of components from (a) to (e) being=100.
The polymeric compositions as defined above can be used as modifiers for bitumen by mixing with this latter. Inert mineral fillers, such as silica, kaolin, micas, calcium carbonate etc., can be present in the mixture of bitumen with such modifiers, in amounts of up to 20% by weight as referred to the total mixture weight.
The above said modifier compositions can be used in amounts comprised within the range of from 10 to 30%, but preferably of from 12 to 25% by weight, as referred to the total weight of the mixture with bitumen and possible fillers.
An object of the present invention is hence constituted by the polymeric compositions suitable to be used as additives in bituminous compositions, comprising a mixture of components from (a) to (e) in the above indicated proportions.
A further object of the present invention is constituted by the bituminous compositions comprising from 10% to 30% by weight of the polymeric composition as defined above.
The polymeric compositions of the present invention can be prepared in form of granules by mixing their components either in extruder, or in Banbury or roller mixer, at such temperatures as to allow such components to be intimately mixed in the mixture, and subsequent granulation.
The bituminous compositions which are the further object of the present invention can be prepared by high-temperature mixing bitumen (possibly with the addition of inert mineral fillers such as for example kaolin, CaCO.sub.3, SiO.sub.2, mica) either with 10-30% by weight, with reference to the total weight of the bituminous composition, of the polymeric composition as defined above, or with the individual components thereof, separately added in an altogether equivalent amount.
The ethylene/propylene copolymers [component (a)] can be prepared according to known methods. Among such copolymers those obtained by using high-yield catalysts, on the basis of titanium comounds, such as, e.g., those disclosed in U.S. Pat. No. 4,013,823 to the Applicant's name, are pr
REFERENCES:
patent: 3144423 (1964-08-01), Belak et al.
patent: 3154508 (1964-10-01), Clelland
patent: 3222706 (1967-05-01), McAninch
patent: 3309329 (1967-03-01), Schultz et al.
patent: 3395110 (1968-07-01), Crady
patent: 3442841 (1969-05-01), Adelman
patent: 3459695 (1969-08-01), Hedge et al.
patent: 3790519 (1974-02-01), Wahlborg
patent: 3941859 (1976-03-01), Batiuk et al.
patent: 4000140 (1976-12-01), Tierney
patent: 4032600 (1977-06-01), Mac Adams et al.
patent: 4069181 (1978-01-01), Healy et al.
patent: 4232132 (1980-11-01), Grigo et al.
patent: 4379888 (1983-04-01), Yoshimura et al.
Ciaccia Vittorio
Milani Federico
Ausimont S.p.A.
Seccuro Carman J.
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