Use of a wax-modified, air rectified asphalt in built up roofing asphalt compositions

Patent metadata

Field	Value
Publication number	US-10189994-B2
Application number	US-201514944374-A
Country	US
Kind code	B2
Filing date	Nov 18, 2015
Priority date	Nov 21, 2014
Publication date	Jan 29, 2019
Grant date	Jan 29, 2019

Abstract

A composition and method for making a heat stable, low application temperature Built Up Roofing Asphalt (BURA) is provided. The composition comprises a wax-modified, air rectified asphalt conforming to Type 3 BURA and, in some embodiments, Type 4 BURA specifications.

First claim

What is claimed is:

1. A heat stable asphalt composition that meets ASTM D 312 (2006) built-up roofing asphalt (“BURA”) specifications, the heat stable asphalt composition comprising:
an air rectified asphalt; and
a wax additive, wherein the additive has a melt point higher than about 100° C.;
wherein the composition has an equiviscous temperature (EVT) of from about 340° F. to about 390° F. for mopping applications and from about 380° F. to about 430° F. for mechanical applications, and wherein the composition has a minimum solubility in trichloroethylene of 99%.

2. The heat stable asphalt composition of claim 1 , wherein the air rectified asphalt is blown to a first softening point from about 140° F. to about 175° F.

3. The heat stable asphalt composition of claim 1 , wherein the air rectified asphalt is blown to a first softening point that is at least about 145° F.

4. The heat stable asphalt composition of claim 1 , wherein the air rectified asphalt is blown to a first softening point from about 145° F. to about 165° F.

5. The heat stable asphalt composition of claim 1 , wherein the air rectified asphalt is blown to a first softening point that is at least about 156° F.

6. The heat stable asphalt composition of claim 1 , wherein the air rectified asphalt is blown to a first softening point of about 164° F.

7. The heat stable asphalt composition of claim 1 , wherein the wax additive comprises from about 1.5% to about 4.5% based on the weight of the total BURA composition.

8. The heat stable asphalt composition of claim 1 , wherein the wax additive comprises one or more of a functionalized wax, a synthetic wax, or a naturally occurring wax.

9. The heat stable asphalt composition of claim 1 , wherein the wax additive comprises a synthetic wax selected from ethylene bis-stearamide wax (EBS), Fischer-Tropsch wax (FT), oxidized Fischer-Tropsch wax (FTO), polyolefin wax, polyethylene wax (PE), oxidized polyethylene wax (PEO), polypropylene wax, polypropylene/polyethylene wax, alcohol wax, silicone wax, petroleum wax, microcrystalline wax, or paraffin.

10. The heat stable asphalt composition of claim 9 , wherein the wax additive comprises one or more of a Fischer-Tropsch wax, a polyethylene wax, and an ethylene bis-stearamide wax.

11. The heat stable asphalt composition of claim 1 , wherein the wax additive comprises a functionalized wax selected from amine waxes, amide waxes, ester waxes, carboxylic acid waxes, and microcrystalline waxes.

12. The heat stable asphalt composition of claim 1 , wherein the wax additive comprises a naturally occurring wax derived from a plant, animal or mineral.

13. The heat stable asphalt composition of claim 12 , wherein the naturally occurring wax is selected from candelilla wax, carnauba wax, rice wax, Japan wax, jojoba oil, beeswax, lanolin whale wax, montan wax, ozokerite and ceresin.

Assignees

• Owens Corning Intellectual Capital Llc

Inventors

• Trumbore David C

Classifications

• E04D7/00

  Roof covering {exclusively consisting of} sealing masses applied in situ; Gravelling of flat roofs · CPC title

• C08L91/06

  Waxes · CPC title

• E04D11/02

  Build-up roofs, i.e. consisting of two or more layers bonded together in situ, at least one of the layers being of watertight composition (gravelling of flat roofs E04D7/00; venting or ventilation E04D13/17) · CPC title

• C08L2555/64

  Oils, fats or waxes based upon fatty acid esters, e.g. fish oil, olive oil, lard, cocoa butter, bees wax or carnauba wax · CPC title

• C08L95/00 Primary

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