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Bituminous compositions containing linear copolymers

a technology of linear copolymers and bituminous compositions, which is applied in the direction of roads, building components, and ways, can solve the problems of affecting other physical properties and impaired low temperature performance, and achieve good high and low temperature performance and improved physical properties

Inactive Publication Date: 2002-03-12
FINA RES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

It has been unexpectedly found that improved physical properties at both high and low temperature of a bituminous composition are obtained by incorporating small amounts of such asymmetrical elastomeric block copolymers in a bituminous composition. The copolymer-containing bituminous composition and obtained by this invention is surprisingly provided with all the desired physical performance that gives to final roofing and waterproofing membranes or material, broader ranges of working temperatures and appropriate dynamic viscosities required by standard application equipments. The improved ranges of service temperatures, which are defined as the difference between the softening point and the cold-bending temperature, give to the ultimate membranes both good high and low temperature performance sot that they can be used under prevailing environmental conditions in any geographical location.

Problems solved by technology

However, the latter are obtained at the detriment of other physical properties limiting their broader applications.
For example, when those elastomeric block copolymers are added to a bituminous material to improve high temperature properties, the low temperature performance is impaired.
Unfortunately, this process implies the mixture of at least two compounds, namely two separately-prepared copolymers, with a bituminous component in order to obtain compositions that give the desired properties to the final membranes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Asymmetrical non tapered linear block copolymer BL-6 is blended in a bituminous component B180 / 200. Copolymer BL-6 has a strong asymmetry ration of 4.22 with endblock peak molecular weights of 42600 and 10100.

As illustrated on table 2.1, this mixture results in a Ring and Ball temperature of 111.degree. C., a Cold-Bending temperature of 31 48.degree. C. and a working temperature range of 159.degree. C. The dynamic viscosities of 2.6 Pa.s at 160.degree. C. and 1.4 Pa.s at 180.degree. C. remain in an adequate range as defined previously in the description of this invention.

TABLE 2.1 COPOLYMER DATA BIT. COMPOS. RESULTS Elast. Segments Endblocks weig. BIT. COMPON W. T.degree. dyn. viscosity asym aver. W mon. A.sub.1 A.sub.2 conc. Pen @ 25.degree. C. R & B C-B range 180.degree. C. 180.degree. C. Name ratio Mp type Mp % type Mp Mp % dmmm (10.sup.-4 m) .degree. C. .degree. C. .degree. C. Pa .multidot. s Pa .multidot. s BL-6 4.22 172000 butad 119000 69.4 styr. 42600 10100 13 180 / 200 111 -48...

example 2

Table 2.2 illustrates a bituminous composition prepared by blending a bituminous component B80 / 100 with asymmetrical copolymer BL-7. The endblock peak molecular weights of 45600 and 11100 respectively correspond to an asymmetry ratio of 4.11; the peak molecular weight of copolymer is 165000 and the weight concentration in the composition is 13%.

COPOLYMER DATA BIT. COMPOS. RESULTS Elast. Segments Endblocks weig. BIT. COMPON W. T.degree. dyn. viscosity asym aver. W mon. A.sub.1 A.sub.2 conc. Pen @ 25.degree. C. R & B C-B range 180.degree. C. 180.degree. C. Name ratio Mp type Mp % type Mp Mp % dmmm (10.sup.-4 m) .degree. C. .degree. C. .degree. C. Pa .multidot. s Pa .multidot. s BL-7 4.11 165000 butad 106000 65.6 styr. 45600 11100 Mp: measured peak molecular weight

The Ring and Ball temperature of 108.degree. C. and the Cold-Bending temperature of 31 42.degree. C. result in an enlarged range of working temperature of 150.degree. C. while the dynamic viscosities of 2.7 Pa.s at 160.degree...

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Abstract

The present invention relates to bituminous compositions used for roofing and waterproofing membranes or material comprising asymmetrical linear polyvinyl aromatic-polydiene block copolymers having improved physical properties over broader ranges of service temperatures than those obtained from bituminous compositions prepared with symmetrical block copolymers of similar type.The asymmetry of the copolymer which is characterised by polyvinyl aromatic endblocks of at least two different molecular weights, one high and one low, ensures improved physical performance to roofing and waterproofing membranes made from such compositions.

Description

CROSS REFERENCE TO RELATED APPLICATIONThis application claims priority of pending application filed in Belgium on Jan. 8, 1997, Application Number 97100185.4 to the same inventors as the present application.FIELD OF THE INVENTIONThe present invention relates to polymer-modified bituminous compositions, used for roofing and waterproofing membranes or material.BACKGROUND OF THE INVENTIONPhysical properties of a bituminous composition used for roofing and waterproofing membranes or material such as low temperature break resistance, flexibility, high temperature flow resistance and viscosity can be improved, as disclosed in U.S. Pat. No. 4,530,652, by incorporating radial elastomeric block copolymers whose structure is defined by the general formula (A-B).sub.n Y wherein Y is the residue of a polyfunctional coupling agent, (A-B) represents a single arm constituted of a polydiene block B and a polyvinyl aromatic endblock A, and "n" represents the number of arms (A-B). Bituminous composit...

Claims

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Application Information

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IPC IPC(8): C08L95/00
CPCC08L95/00C08L53/00
Inventor HAVEAUX, BERNARDLANZA, EMMANUELHALLET, JEAN-PHILIPPENOIRET, ANDRE
Owner FINA RES SA