Non-carboxylated styrene-butadiene copolymers, preparation method and use thereof

Patent metadata

Field	Value
Publication number	US-9815984-B2
Application number	US-201615180778-A
Country	US
Kind code	B2
Filing date	Jun 13, 2016
Priority date	Oct 14, 2010
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

A non-carboxylated styrene-butadiene copolymer, preparation method and use thereof are provided. The non-carboxylated styrene-butadiene copolymer is prepared by hot polymerization in the absence of acid monomers and is used in asphalt-based systems such as asphalt emulsions.

First claim

What is claimed is:

1. A polymer-modified asphalt composition, comprising
asphalt; and
a styrene-butadiene copolymer comprising styrene and butadiene monomer units, wherein said copolymer is cured with a sulfur curing agent, is non-carboxylated, and is polymerized at a temperature of 40° C. or greater, and wherein the cis-1,4 butadiene units are greater than 20% and the trans-1,4 butadiene units are less than 60% of the total number of butadiene units in the copolymer.

2. The asphalt composition of claim 1 , wherein the composition is substantially free of water.

3. The asphalt composition of claim 2 , having a viscosity of less than 2000 cp at 135° C.

4. The asphalt composition of claim 1 , further comprising water, wherein the asphalt and the styrene-butadiene copolymer are dispersed in the water with a surfactant to form an asphalt emulsion.

5. The asphalt composition of claim 1 , wherein the styrene-butadiene copolymer is present in an amount of from 0.5% to 30% based on the total solids content of the styrene-butadiene copolymer and the asphalt.

6. The asphalt composition of claim 1 , further comprising a second styrene-butadiene copolymer having a weight ratio of styrene to butadiene monomer units of 20:80 to 80:20 and polymerized at a temperature of less than 40° C.

Assignees

• Basf Se

Inventors

• Avramidis Kostas S
• Kirk William J

Classifications

• C08L47/00

  Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Compositions of derivatives of such polymers (C08L45/00 takes precedence; of conjugated diene rubbers C08L9/00 - C08L21/00) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2555/28

  Asphalt produced between 0°C and below 65°C, e.g. cold mix asphalt produced between 0°C and 35°C · CPC title

• C08K3/20

  Oxides; Hydroxides {(graphene oxides C08K3/042)} · CPC title

• C04B26/26

  Bituminous materials, e.g. tar, pitch {(C08L95/00 takes precedence)} · CPC title