Adhesive composition

Patent metadata

Field	Value
Publication number	US-10023770-B2
Application number	US-201515505363-A
Country	US
Kind code	B2
Filing date	Aug 20, 2015
Priority date	Aug 21, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

The present disclosure provides an adhesive composition. The adhesive composition includes: A) a propylene based plastomer or elastomer (PBPE) comprising up to 15 wt % units derived from ethylene and having (i) a Koenig B-value less than 1.0; (ii) a total unsaturation per mole of propylene from 0.010% to 0.030%; (iii) a density from 0.860 g/cc to 0.890 g/cc; (iv) a melt viscosity at 177° C. from 1,000 mPa·s to 15,000 mPa·s; and (v) a weight average molecular weight from 20,000 to 50,000 g/mole.

First claim

The invention claimed is:

1. An adhesive composition comprising:
A) a propylene based plastomer or elastomer (PBPE) comprising up to 15 wt % units derived from ethylene and having:
(i) a Koenig B-value less than 1.0;
(ii) a total unsaturation per mole of propylene from 0.010% to 0.030%;
(iii) a density from 0.860 g/cc to 0.890 g/cc;
(iv) a melt viscosity, at 177° C., from 1,000 mPa·s to 15,000 mPa·s; and
(v) a weight average molecular weight from 20,000 to 50,000 g/mole.

2. The composition of claim 1 , further comprising a propylene-based polymer wax.

3. The composition of claim 1 , wherein the PBPE has a melt viscosity, at 177° C., from 5,000 mPa·s to 15,000 mPa·s.

4. The composition of claim 1 , wherein the PBPE has a weight average molecular weight from 24,000 to 50,000 g/mole.

5. The composition of claim 1 , wherein the PBPE has a density from 0.860 g/cc to 0.870 g/cc.

6. The composition of claim 1 , wherein the PBPE has a melt viscosity, at 177° C., from 7000 mPa·s to 15,000 mPa·s.

7. The composition of claim 1 , wherein the PBPE comprises from 10 wt % to 15 wt % units derived from ethylene.

8. The composition of claim 1 , wherein the PBPE has a total unsaturation per mole propylene from 0.018% to 0.022%.

9. The composition of claim 1 , wherein the propylene-based polymer wax is a metallocene-catalyzed propylene-based wax.

10. The composition of claim 9 , wherein the propylene-based polymer wax has a density from 0.89 g/cc to 0.91 g/cc.

11. The composition of claim 1 , comprising:
(A) from 80 wt % to 95 wt % PBPE;
(B) from 20 wt % to 5 wt % propylene-based polymer wax; and
wherein the composition has a crystallization temperature (Tc) from 55° C. to 90° C.

12. The composition of claim 11 , wherein the composition has a secant modulus (100%) from 6.5 kPa to 40 kPa.

13. The composition of claim 1 , comprising from 10 wt % to 30 wt % tackifier.

14. The composition of claim 1 , comprising from 10 wt% to 30 wt % oil.

15. The composition of claim 11 , wherein the composition has a melt viscosity at 150° C. from 1000 mPa·s to 20,000 mPa·s.

16. The composition of claim 11 , wherein the composition has a Tc from 20° C. to 65° C, when cooled at a rate of 40° C./min to 200° C/min.

17. An article comprising at least one component formed from the composition of claim 1 .

18. An article comprising:
a substrate; and
an adhesive composition, according to claim 1 , on at least one surface of the substrate.

19. The article of claim 18 , wherein the substrate is a non-woven fabric.

20. The article of claim 18 , wherein adhesive composition forms a seal between the at least one surface of the substrate and at least one surface of another substrate.

Assignees

• Dow Global Technologies Llc

Inventors

• Mclennaghan Allan W
• Jin Yi
• Brown Kate

Classifications

• C08L23/16

  Ethylene-propylene or ethylene-propylene-diene copolymers · CPC title

• C08F210/06

  Propene · CPC title

• C08L2314/06

  Metallocene or single site catalysts · CPC title

• C09J123/16 Primary

  Elastomeric} ethylene-propylene or ethylene-propylene-diene copolymers {, e.g. EPR and EPDM rubbers · CPC title

• C08F2500/17

  Viscosity · CPC title