Dispersion powder in asphalt

Patent metadata

Field	Value
Publication number	US-9969884-B2
Application number	US-201514709847-A
Country	US
Kind code	B2
Filing date	May 12, 2015
Priority date	May 12, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

The subject of the invention is a polymer-modified asphalt composition obtained by blending asphalt with a vinyl acetate/ethylene polymer, and optionally with further additives, and a process for the preparation of the polymer-modified asphalt composition, and the use of the polymer-modified asphalt composition.

First claim

What is claimed is:

1. A non-aqueous polymer modified asphalt composition comprising a blend of non-aqueous asphalt with a vinyl acetate/ethylene copolymer composition having a vinyl acetate content of more than 55% by weight based on the polymer content of the copolymer composition, and optionally also comprising an S-polymer, wherein the ethylene content of the vinyl acetate/ethylene copolymer is 40 wt. % or less based on the polymer content of the copolymer composition, and wherein the vinyl acetate/ethylene copolymer composition is in the form of a water-redispersible powder prior to blending with non-aqueous asphalt to form the blend.

2. The polymer modified asphalt of claim 1 , wherein the vinyl acetate/ethylene copolymer composition is present in an amount of from 1 to 40 weight percent based on the weight of the polymer modified asphalt composition.

3. The polymer modified asphalt composition of claim 1 , wherein at least one S-polymer or GTR is contained in the blend.

4. The polymer modified asphalt composition of claim 1 , further comprising one or more additives selected from anti-aging agents, extenders, processing aids, naphthenic oils, paraffinic oils, waxes, fillers, tackifiers, rosin esters, acids, solvents, and/or reinforcing fibers.

5. The polymer modified asphalt composition of claim 1 , wherein the vinyl acetate/ethylene copolymer further comprises moieties derived from one or more of vinyl esters of C 3-15 acids, (meth)acrylate esters of C 1-15 alcohols, vinyl chloride, butadiene, isoprene and/or styrene.

6. The polymer modified asphalt composition of claim 1 , further comprising moieties derived from ethylenically unsaturated monocarboxylic and dicarboxylic acids, ethylenically unsaturated carboxamides and carbonitriles, maleic anhydride, ethylenically unsaturated sulfonic acids and their salts, polyethylenically unsaturated comonomers of N-methylolacrylamide (NMA), N-methylolmethacrylamide (NMMA), and optionally epoxide-functional comonomers, and silicone functional comonomers.

7. The polymer modified asphalt of claim 1 , wherein the vinyl acetate/ethylene copolymer composition is present in an amount of from 1 to 30 weight percent based on the weight of the polymer modified asphalt composition.

8. The polymer modified asphalt of claim 3 , wherein the weight ratio of S-polymer to vinyl acetate/ethylene copolymer is less than 2:1.

9. The polymer-modified asphalt of claim 1 , wherein the total polymer content of the polymer modified asphalt is from 1 to 15 weight percent based on the total weight of the polymer-modified asphalt composition.

10. A process for the preparation of the polymer modified asphalt composition of claim 1 , wherein the blend is prepared by blending the vinyl acetate/ethylene copolymer, non-aqueous asphalt, and any further components at a temperature above the softening point of the asphalt.

11. The process of claim 10 , wherein blending is performed at a temperature of from 175° C. to 195° C.

12. The process of claim 10 , wherein an S-polymer is further blended with the non-aqueous asphalt.

13. A non-aqueous polymer modified asphalt composition consisting of a blend of non-aqueous asphalt with a vinyl acetate/ethylene copolymer composition having a vinyl acetate content of more than 55% by weight based on the polymer content of the copolymer composition, and optionally also comprising an S-polymer, wherein the ethylene content of the vinyl acetate/ethylene copolymer is 40 wt. % or less based on the polymer content of the copolymer composition, and wherein the vinyl acetate/ethylene copolymer composition is in the form of a water-redispersible powder prior to blending with non-aqueous asphalt to form the blend,
optionally, one or more additives selected from anti-aging agents, extenders, processing aids, naphthenic oils, paraffinic oils, waxes, fillers, tackifiers, rosin esters, acids, solvents, and/or reinforcing fibers,
optionally, wherein the vinyl acetate/ethylene copolymer further contains moieties derived from one or more of vinyl esters of C 3-15 acids, (meth)acrylate esters of C 1-15 alcohols, vinyl chloride, butadiene, isoprene and/or styrene,
optionally, wherein the vinyl acetate/ethylene polymer further contains moieties derived from ethylenically unsaturated monocarboxylic and dicarboxylic acids, ethylenically unsaturated carboxamides and carbonitriles, maleic anhydride, ethylenically unsaturated sulfonic acids and their salts, polyethylenically unsaturated comonomers of N-methylolacrylamide (NMA), N-methylolmethacrylamide (NMMA), and optionally epoxide-functional comonomers, and silicone functional comonomers.

Assignees

• Wacker Chemical Corp
• Wacker Chemie Ag

Inventors

• Murthy Ranjini
• Ferreira Peralta Elvira Joana
• Pimentel Corrin

Classifications

• C08L2555/80

  Macromolecular constituents · CPC title

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08L95/005

  Aqueous compositions, e.g. emulsions · CPC title

• C08L31/04

  Homopolymers or copolymers of vinyl acetate · CPC title

• C08L95/00 Primary

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