Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-04-20
2000-01-04
Szekely, Peter A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523351, 523450, 524 59, 524 69, 524 70, 524 71, C08K 9500, C08L 6300
Patent
active
060110953
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention relates to a process for the preparation of bitumen/polymer compositions with a very low temperature susceptibility. It further relates to the application of the compositions obtained to the production of bitumen/polymer binders for the preparation of coatings and in particular of road surfacings, of bituminous mixes or alternatively of watertight facings.
2) Background Art
It is known to use bituminous compositions as various surface coatings and in particular as road surface coatings, provided that these compositions possess a certain number of essential mechanical qualities.
These mechanical qualities are assessed, in practice, by determining, by standardized tests, a series of mechanical characteristics, the most widely used of which are as follows: ring-and-ball test defined by NF Standard T 66008, according to IP Standard 80/53, Standard T 66004, 46002 and comprising the quantities:
It is also possible to obtain an indication of the temperature susceptibility of bituminous compositions from a correlation between the penetrability (abbreviated to pen) and the softening point (abbreviated to RBT) of the said compositions known under the name of Pfeiffer number (abbreviated to PN).
This number is calculated from the relationship: ##EQU1## in which A is the slope of the straight line represented by the equation: ##EQU2##
The temperature susceptibility of the bituminous composition decreases as the value of the Pfeiffer number increases or, which comes to the same thing, as the value of the quantity A decreases. For conventional bitumens, the Pfeiffer number takes values lying in the vicinity of zero.
In general, conventional bitumens do not simultaneously exhibit all the required qualities and it has been known for a long time that the addition of varied polymers to these conventional bitumens makes it possible to favourably modify the mechanical properties of the latter and to form bitumen/polymer compositions having improved mechanical qualities with respect to those of the bitumens alone.
The incorporation of olefinic polymers functionalized by epoxy or carboxyl groups in bituminous compositions composed of one or more bitumens or composed of one or more bitumens and of one or more polymers not containing such groups results in the production of bitumen/polymer compositions with significantly improved consistency (increase in the ring-and-ball softening point), temperature susceptibility (increase in the Pfeiffer number) and tensile mechanical properties.
Such bitumen/polymer compositions, which contain olefinic polymers functionalized by epoxy or carboxyl groups, are described in particular in the references U.S. Pat. Nos. 4,650,820, 5,306,750 and 5,331,028, as well as in the French patent application filed by the Applicant Company on Oct. 11, 1994 under the number 9413537. Thus, the reference U.S. Pat. No. 4,650,820 relates to a bitumen/polymer composition containing, by weight, 95% to 99% of a bitumen having a pseudoviscosity at 30.degree. C. lying in the range 200 to 1000 seconds and 1% to 5% of a terpolymer composed of 88% to 98.7%, on a molar basis, of units deriving from ethylene, of 1% to 10%, on a molar basis, of units deriving from at least one C.sub.1 to C.sub.6 alkyl acrylate or methacrylate and of 0.3% to 3% of units deriving from maleic anhydride.
The reference U.S. Pat. No. 5,306,750 describes a bitumen/polymer composition consisting of a reaction product obtained by bringing a bitumen into contact, at temperatures of 125.degree. C. to 250.degree. C. and with stirring for a period of time of the order of 3 hours to 48 hours, with an ethylene copolymer containing, by weight, 0.1% to 20% of glycidyl groups, the amount of the copolymer representing 0.05% to 20% of the weight of the composition. In particular, the ethylene copolymer containing glycidyl groups is a random copolymer of ethylene, of 0.5 to 15% by weight of a monomer containing a glycidyl group, in particular glycidyl acrylate or methacrylate, and of 0 to 50%
REFERENCES:
patent: 4650820 (1987-03-01), Decroix
patent: 4839404 (1989-06-01), Chang et al.
patent: 4882373 (1989-11-01), Moroih
patent: 5070123 (1991-12-01), Moran
patent: 5095055 (1992-03-01), Moran
patent: 5331028 (1994-07-01), Goodrich
patent: 5519073 (1996-05-01), van der Werff et al.
patent: 5556900 (1996-09-01), Goodrich et al.
patent: 5565510 (1996-10-01), Giavarini et al.
patent: 5576363 (1996-11-01), Gallagher et al.
patent: 5604274 (1997-02-01), Gallagher et al.
patent: 5618862 (1997-04-01), Germanaud et al.
patent: 5756565 (1998-05-01), Germanaud et al.
Lacour Claude
Planche Jean-Pascal
Turello Patrick
Elf Antar France
Szekely Peter A.
LandOfFree
Method for preparing bitumen/polymer compositions and use thereo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for preparing bitumen/polymer compositions and use thereo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for preparing bitumen/polymer compositions and use thereo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1073227