Asphaltic roofing shingle with self seal adhesive composition
View Patent ↗It has been unexpectedly found that the solvent extracted aromatic cut of heavy vacuum gas oil can be oxidized to produce an adhesive composition that has all the needed attributes of a self seal adhesive for asphalt roofing shingles. This adhesive composition does not require any volatile organic solvents and is accordingly environmentally friendly. It does not contain any asphalt or polymers and will not phase separate. Thus, it offers excellent long term stability. Additionally, it is made by the simple oxidation of the solvent extracted aromatic cut of heavy vacuum gas oil and is accordingly relatively inexpensive. The subject invention more specifically reveals an asphaltic roofing shingle comprising a back surface and an exposure surface, wherein the back surface is covered with an oxidized solvent extracted aromatic cut of heavy vacuum gas oil.
1. An asphaltic roofing shingle which is comprised of a back surface and an exposure surface, wherein the asphaltic roofing shingle has a self seal adhesive on the back surface or the exposure surface, and wherein the self seal adhesive is comprised of an oxidized solvent extracted aromatic cut of heavy vacuum gas oil, and wherein the oxidized solvent extracted aromatic cut from the heavy vacuum gas oil is at least 95% soluble in normal-heptane, wherein the solvent extracted aromatic cut of heavy vacuum, gas oil is essentially free of an aliphatic component.
2. An asphaltic roofing shingle as specified in claim 1 wherein the self adhesive is on the back surface of the roofing shingle, and wherein the self seal adhesive is covered with a release tape.
3. An asphaltic roofing shingle as specified in claim 1 wherein the oxidized solvent extracted aromatic cut from the heavy vacuum gas oil has a softening point which is within the range of 170° F. to 250° F.
4. An asphaltic roofing shingle as specified in claim 3 wherein the oxidized solvent extracted aromatic cut of heavy vacuum gas oil is at least 98% soluble in normal-heptane.
5. An asphaltic roofing shingle as specified in claim 3 wherein the oxidized solvent extracted aromatic cut of heavy vacuum gas oil exhibits ultraviolet fluorescence.
6. An asphaltic roofing shingle as specified in claim 3 wherein the oxidized solvent extracted aromatic cut of heavy vacuum gas oil contains carbonyl functionality.
7. An asphaltic roofing shingle as specified in claim 6 wherein the carbonyl functionality includes ketone moieties.
8. An asphaltic roofing shingle as specified in claim 1 wherein the oxidized solvent extracted aromatic cut of heavy vacuum gas oil is further comprised of a mineral filler.
9. An asphaltic roofing shingle as specified in claim 8 wherein the mineral filler is present at a level which is within the range of about 5 weight percent to about 40 weight percent.
10. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is limestone.
11. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is clay.
12. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is talc.
13. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is fly ash.
14. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is volcanic ash.
15. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is carbon black.
16. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is graphite.
17. An asphaltic roofing shingle as specified in claim 9 wherein the mineral filler is carbon black.
18. An asphaltic roofing shingle as specified in claim 8 wherein the mineral filler is present at a level which is within the range of 10 weight percent to about 30 weight percent.
19. An asphaltic roofing shingle as specified in claim 1 wherein the solvent extracted aromatic cut of heavy vacuum gas oil is oxidized by air blowing, wherein the air blowing is conducted at a temperature which is within the range of 400° F. to 550° F.
20. An asphaltic roofing shingle as specified in claim 19 wherein the air blowing is conducted until the oxidized solvent extracted aromatic cut from the heavy vacuum gas oil has a softening point which is within the range of 170° F. to 250° F.