Bituminous compositions modified with polyolefinic materials
AssigneeMontell Technology Company BV
InventorsVittorio Braga, Emilio Martini, Maurizio Galimberti, Enrico Albizzati
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Abstract
The present invention relates to bituminous compositions, particularly suitable for paving and building waterproofing, comprising a bitumen and a copolymer of ethylene with propylene and/or other alpha-olefins and optionally with smaller proportion of a diene or polyene. The copolymer is besides characterized by a very low crystallinity, intrinsic viscosity higher than 1.5 dl/g and by a content of propylene units or of the alpha-olefin in form of triads comprised between 4 and 50% of the propylene or of the alpha-olefin, with at least 70% of said triads having isotactic structure.
Claims7
Bituminous composition consisting of a bitumen and a copolymer of ethylene with propylene and/or alpha-olefin CH2═CHR,, wherein R is an alkyl radical containing 2-10 carbon atoms, and a diene or polyene, said copolymer containing from 35 to 85 mol % of ethylene, from 15 to 65 mol % of propylene and/or alpha-olefin, and from 0-10% by moles of dienes or polyenes, said copolymer being prepared by polymerization of mixtures of ethylene, propylene and/or alpha-olefin, and diene or polyene with chiral catalysts obtained from metallocene derivatives of zirconium and having the following properties:
- i. solubility in pentane at 25° C. higher than 90%;
- ii. melting enthalpy lower than 20 J/g;
- iii. content of propylene or alpha-olefin units in the form of triads of from 4 to 50% of the propylene or alpha-olefin, with at least 70% of said triads having isotactic structure;
- iv. values of the product r1·r2 of the reactivity ratio of ethylene, r1, and propylene or alpha-olefin, r2, of from 0.4 to 1;
- and
- v. intrinsic viscosity at 135° C. in tetrahydronaphthalene higher than or equal to 1.5 dl/g.
Bituminous composition consisting of a bitumen and a copolymer of ethylene with propylene and/or alpha-olefin CH2═CHR, wherein R is an alkyl radical containing 2-10 carbon atoms, and a diene or polyene, said copolymer containing from 35 to 85 mol % of ethylene, from 15 to 65 mol % of propylene and/or alpha-olefin, and from 0-10% by moles of units deriving from dienes or polyenes, said copolymer being prepared by polymerization of mixtures of ethylene, propylene and/or alpha-olefin, and diene or polyene with a catalyst obtained from a chiral zirconium metallocene compound selected from ethylene-bis (tetrahydroindenyl) zirconium dichloride, dimethylsilanylene -bis(tetrahydroindenyl) zirconium dichloride, and tetraisobutyl alumoxane, said copolymer having the following properties:
- i. solubility in pentane at 25° C. higher than 90%;
- ii. melting enthalpy lower than 20 J/g;
- iii. content of propylene or alpha-olefin units in the form of triads of from 4 to 50% of the propylene or alpha-olefin, with at least 70% of said triads having isotactic structure;
- iv. values of the product r1·r2 of the reactivity ratio of ethylene, r1, and propylene or alpha-olefin, r2, of from 0.4 to 1;
- and
- v. intrinsic viscosity at 135° C. in tetrahydronaphthalene higher than or equal to 1.5 dl/g.
Dependencies are inferred from the claim text.