PHA adhesive compositions
View Patent ↗PHA adhesive compositions, and related methods and articles are disclosed.
1. A method comprising:
applying a PHA solution comprising a solvent and a PHA to a substrate surface to form a layer of the PHA solution;
removing at least some of the solvent to form a PHA adhesive composition on the substrate surface;
wherein the PHA is a poly 3-hydroxybutyrate-co-4-hydroxybutyrate having a glass transition temperature from about −30° C. to about −5° C.; and the adhesive composition has an open time of at least 10 minutes; and the adhesive composition has a surface tack time value of at most about 15 seconds.
2. The method of claim 1 , wherein the layer has a thickness of at most about 300 microns.
3. The method of claim 1 , wherein the solvent is removed by evaporation.
4. The method of claim 1 , wherein the solvent is removed at a temperature at most about 40° C.
5. The method of claim 1 , further comprising contacting the substrate surface having the PHA adhesive composition thereon with a second substrate surface to form an adhesive bond with the second substrate surface.
6. The method of claim 5 , wherein the second substrate surface is coated with the PHA adhesive composition before contacted with the substrate surface.
7. The method of claim 5 , wherein the second substrate surface is not coated with the PHA adhesive composition before contacted with the substrate surface.
8. The method of claim 1 , wherein the PHA has a glass transition temperature from about −25° C. to about −10° C.
9. An article comprising:
a substrate having a surface; and
an adhesive composition supported by the surface of the substrate, wherein the adhesive composition comprises a PHA, the PHA being poly 3-hydroxybutyrate-co-4-hydroxybutyrate having a glass transition temperature from about −30° C. to about −5° C.; and the adhesive composition has an open time of at least 10 minutes; and the adhesive composition has a surface tack time value of at most about 15 seconds.
10. The article of claim 9 , wherein the adhesive composition forms a layer on the surface of the substrate.
11. The article of claim 10 , wherein the layer has a thickness of at most about 300 microns.
12. The article of claim 9 , further comprising a second substrate surface adhesively bonded to the surface of the article supporting the adhesive composition.
13. The article of claim 9 , wherein the PHA has a glass transition temperature from about −25° C. to about −10° C.
14. The article of claim 9 , wherein the adhesive composition comprises multiple different PHAs.
15. The article of claim 14 , wherein the adhesive composition comprises two different PHAs.
16. The article of claim 9 , wherein the adhesive composition further comprises one or more solvents.
17. The article of claim 16 , wherein the adhesive composition comprises at most about 90 weight percent solvent.
18. The article of claim 16 , wherein the adhesive composition comprises at most about 80 weight percent solvent.
19. The article of claim 16 , wherein the adhesive composition comprises at most about 75 weight percent solvent.
20. The article of claim 16 , wherein the adhesive composition comprises at most about 50 weight percent solvent.
21. The article of claim 16 , wherein the adhesive composition comprises at most about 35 weight percent solvent.
22. The article of claim 16 , wherein the adhesive composition comprises at most about 1 weight percent solvent.
23. The article of claim 16 , wherein the adhesive composition comprises an organic solvent.
24. The article of claim 23 , wherein the organic solvent is selected from the group consisting of hexane, heptane, benzene, toluene, ether, methyl tert-butyl ether, ethyl acetate, butyl acetate, methylene chloride, chloroform, acetonitrile, methanol, ethanol, isopropanol, and 2,2,2-trifluoroethanol.
25. The article of claim 16 , wherein the adhesive composition comprises an aqueous solvent.
26. The article of claim 16 , wherein the adhesive composition comprises two or more solvents.
27. The article of claim 9 , wherein the adhesive composition further comprises one or more adhesive additives.
28. The article of claim 27 , wherein the adhesive composition comprises at most about 95 weight percent adhesive additives.
29. The article of claim 27 , wherein the adhesive composition comprises at most about 50 weight percent adhesive additives.
30. The article of claim 27 , wherein the adhesive composition comprises at most about 10 weight percent adhesive additives.
31. The article of claim 27 , wherein the adhesive composition comprises at most about 1 weight percent adhesive additives.
32. The article of claim 27 , wherein the adhesive additives are selected from the group consisting of tackifiers, cross-linking agents, initiators, colorants, waxes, stabilizers and plasticizers.
33. The article of claim 9 , wherein the adhesive composition has an open time of at least 100 minutes.
34. The article of claim 9 , wherein the adhesive composition has an open time of at least 200 minutes.
35. The article of claim 9 , wherein the adhesive composition has a surface tack time value of at most about 5 seconds.
36. The article of claim 9 , wherein the adhesive composition has a surface tack time value of at most about 1 second.