Reducing crumb rubber modified bitumen odors

Patent metadata

Field	Value
Publication number	US-2021284844-A1
Application number	US-201716340754-A
Country	US
Kind code	A1
Filing date	Oct 11, 2017
Priority date	Oct 12, 2016
Publication date	Sep 16, 2021
Grant date	—

Abstract

A method for reducing odors including the steps of admixing active agents and a diluting agent to liquid crumb rubber modified bitumen, wherein the active agents comprise 20 to 60 wt.-% of an aldehyde selected from alpha-hexyl cinnamaldehyde, 2-(4-tert.-butylbenzyl) propionaldehyde, 2-benzylidenheptanal, or mixtures thereof, and 10 to 40 wt.-% of one or more alcohols having a boiling point of at least 150° C., calculated on the total weight of active agents. A crumb rubber modified bitumen composition as obtained by the method above. The use of a crumb rubber modified bitumen composition as obtained by the method above in road surfacing and road base materials, in insulating layers for buildings, in roofing materials and/or in sealing sheeting.

First claim

1 . A method for reducing odors including the steps of admixing active agents and a diluting agent to liquid crumb rubber modified bitumen, wherein the active agents comprise:
A: 20 to 60 wt.-% of aldehyde(s) selected from:
A1. alpha-hexyl cinnamaldehyde,
A2. 2-(4-tert.-butylbenzyl) propionaldehyde,
A3. 2-benzylidenheptanal,
or mixtures thereof,
B: 0 to 20 wt.-% of one or more other aldehydes having at least 10 carbon atoms in the molecule, C: 10 to 40 wt.-% of one or more alcohols having a boiling point of at least 150° C., D: 0 to 20 wt.-% of one or more terpenes having a boiling point of at least 150° C., E: 0 to 10 wt.-% of ketone(s) having a boiling point of at least 150° C., F: 0 to 10 wt.-% of carbonic acid ester(s), calculated on the total weight of active agents.

2 . The method according to claim 1 , wherein the diluting agent is a mineral oil, preferably a hydrocarbon middle distillate, or a vegetable oil, sunflower oil, or a mixture thereof.

3 . The method according to claim 1 , wherein 50 to 400 ppm of a mixture of 5 to 50 wt.-% active agents and 95 to 50 wt.-% of a diluting agent is admixed with a liquid crumb rubber modified bitumen composition comprising:
(a) 20 to 96 wt % bitumen; (b) 3 to 80 wt % of crumb rubber; calculated on the total weight of the crumb rubber modified bitumen composition.

4 . The method according to claim 1 , wherein 50 to 400 ppm of a mixture of 5 to 50 wt.-% active agents and 95 to 50 wt.-% of a diluting agent is admixed with a liquid crumb rubber modified bitumen composition comprising:
(a) 20 to 96 wt % bitumen; (b) 3 to 80 wt % of crumb rubber; (c) 0.1 to 10 wt % of a polymer comprising glycidyl functional groups; and (d) 0.3 to 5 wt % of a wax; calculated on the total weight of the crumb rubber modified bitumen composition.

5 . The method of claim 1 , wherein component B is selected from:
B1. 3-(4-iso-propylphenyl) 2-methylpropanal, B2. 2-methylundecanal, B3. 2-methyl-3-(3,4-methylene-dioxyphenyl)-propanal, or mixtures thereof.

6 . The method of claim 1 , wherein component C is selected from:
C1. linalol, C2. eugenol, C3. geraniol, C4. alpha-terpineol, or mixtures thereof.

7 . The method of claim 1 , wherein component D is selected from:
D1. limonene, D2. alpha-pinene, or mixtures thereof.

8 . The method of claim 4 , wherein the polymer comprising glycidyl functional groups is a copolymer of ethylene and glycidyl acrylate or methacrylate, or a terpolymer of ethylene, alkyl acrylate or methacrylate and glycidyl acrylate or methacrylate.

9 . The method of claim 4 , wherein the polymer comprising glycidyl functional groups is a grafted polymer comprising glycidyl acrylate or methacrylate grafted onto a polyethylene backbone.

10 . The method of claim 4 , wherein the wax is a paraffin wax resulting from a Fischer-Tropsch process, or ethylene bis-stearamide.

11 . A crumb rubber modified bitumen composition as obtained by claim 1 .

12 . (canceled)

Assignees

• Shell Oil Co

Inventors

• Colange Jacques
• Xu Liting
• Yan Hui

Classifications

• C08L95/00 Primary

  Compositions of bituminous materials, e.g. asphalt, tar, pitch · CPC title

• C08L17/00

  Compositions of reclaimed rubber · CPC title

• C08L2555/34

  Recycled or waste materials, e.g. reclaimed bitumen, asphalt, roads or pathways, recycled roof coverings or shingles, recycled aggregate, recycled tires, crumb rubber, glass or cullet, fly or fuel ash, or slag · CPC title

• C08L2555/72

  Petrochemical based or extracted waxes, e.g. paraffin, Montan wax or cracked polyethylene wax · CPC title

• C08L21/00

  Compositions of unspecified rubbers · CPC title