Hot Melt Pressure-Sensitive Adhesives for Removable Applications

Patent metadata

Field	Value
Publication number	US-2016177141-A1
Application number	US-201514924367-A
Country	US
Kind code	A1
Filing date	Oct 27, 2015
Priority date	Dec 18, 2014
Publication date	Jun 23, 2016
Grant date	—

Abstract

The present invention is related to pressure-sensitive hot melt adhesive compositions and their applications. In particular, the adhesive compositions described herein comprise a block copolymer component, a hydrocarbon tackifier resin component, and a propylene-based polymer component, wherein the propylene-based polymer component has a MFR of greater than about 1,000 g/10 min to less than about 10,000 g/10 min.

First claim

We claim:

1 . A pressure-sensitive hot melt adhesive composition comprising:
a. at least one block copolymer component; b. at least one hydrocarbon resin tackifier component; and c. at least one propylene-based polymer component, wherein the propylene-based polymer component comprises a first propylene-based polymer, wherein the first propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a C 4 to C 10 alpha-olefin, and a second propylene-based polymer, wherein the second propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a C 4 to C 10 alpha-olefin, wherein the second propylene-based polymer is different than the first propylene-based polymer and wherein the propylene-based polymer component has a MFR of greater than about 1,000 g/10 min to less than about 10,000 g/10 min.

2 . The adhesive of claim 1 , wherein the at least one block copolymer component is a styrenic block copolymer.

3 . The adhesive composition of claim 1 , wherein the propylene-based polymer component has an Mw of about 10,000 g/mol to about 150,000 g/mol.

4 . The adhesive composition of claim 1 , wherein the composition comprises from about 30 to about 60 wt % of the block copolymer component and from about 5 to about 50 wt % of the tackifier component.

5 . The adhesive composition of claim 1 , further comprising at least one process oil component.

6 . The adhesive composition of claim 1 , wherein the at least one block copolymer component is chosen from at least one of a styrene-isoprene block copolymer, styrene-butadiene block copolymer and styrene-isoprene-butadiene block copolymer.

7 . The adhesive composition of claim 1 , wherein the at least one block copolymer component is chosen from at least one of a radial styrene-isoprene block copolymer and a radial styrene-butadiene block copolymer.

8 . The adhesive composition of claim 1 , wherein the at least one block copolymer component is a radial styrene-isoprene block copolymer.

9 . The adhesive composition of claim 1 , wherein the tackifier component has a ring-and-ball softening point of from about 50 to about 140° C.

10 . The adhesive composition of claim 1 , wherein the first propylene-based polymer of the propylene-based polymer component comprises a copolymer of propylene and ethylene, and the second propylene-based polymer of the propylene-based polymer component comprises a copolymer of propylene and ethylene.

11 . The adhesive composition of claim 1 , wherein the propylene-based polymer component has a melt viscosity of about 800 to about 15,000 cP at 190° C.

12 . The adhesive composition of claim 1 , wherein the composition is substantially free of silicon oils and waxes.

13 . An adhesive composition of claim 1 , consisting essentially of a styrenic block copolymer component, a tackifier component, a propylene-based polymer component and a process oil component.

14 . An adhesive article comprising:
a. a substrate; and b. a pressure-sensitive hot melt adhesive composition comprising:
i. at least one block copolymer component;
ii. at least one hydrocarbon resin tackifier component; and
iii. at least one propylene-based polymer component, wherein the propylene-based polymer component comprises a first propylene-based polymer, wherein the first propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a C 4 to C 10 alpha-olefin, and a second propylene-based polymer, wherein the second propylene-based polymer is a homopolymer of propylene or a copolymer of propylene and ethylene or a C 4 to C 10 alpha-olefin, wherein the second propylene-based polymer is different than the first propylene-based polymer and wherein the propylene-based polymer component has a MFR of greater than about 1,000 g/10 min to less than about 10,000 g/10 min.

15 . The adhesive article of claim 14 , wherein the at least one block copolymer component is a styrenic block copolymer.

16 . The adhesive article of claim 14 , wherein the propylene-based polymer component has an Mw of about 10,000 g/mol to about 150,000 g/mol.

17 . The article of claim 14 , wherein the adhesive composition comprises from about 30 to about 60 wt % of the block copolymer component and from about 5 to about 50 wt % of the tackifier component.

18 . The article of claim 14 , wherein the adhesive composition further comprises at least one process oil component.

19 . The article of claim 14 , wherein the at least one block copolymer component is chosen from at least one of styrene-isoprene block copolymer, a styrene-butadiene block copolymer, a styrene-isoprene-butadiene block copolymer, a radial styrene-isoprene block copolymer, and a radial styrene-butadiene block copolymer.

20 . The article of claim 14 , wherein the adhesive composition is substantially free of silicon oils and waxes.

21 . The article of claim 14 , wherein the propylene-based polymer component has a melt viscosity of about 800 to about 15,000 cP at 190° C.

22 . The article of claim 14 , wherein the initial 180° peel strength on a steel substrate is lower than or equal to 10 N/25 mm at a coating weight of about 20 gsm.

23 . The article of claim 14 , wherein the initial 180° peel strength on a glass substrate is lower than or equal to 10 N/25 mm at a coating weight of about 20 gsm.

24 . The article of claim 14 , wherein the initial 180° peel strength on a polyethylene film substrate is lower than or equal to 10 N/25 mm at a coating weight of about 20 gsm.

25 . The article of claim 14 , wherein the shear at 23° C. on a steel substrate (25 mm*25 mm, 1 Kg) is greater than or equal to 10 hours.

Assignees

• Exxonmobil Chem Patents Inc

Inventors

• Schroeyers Jurgen J M
• Swiggers Eddy
• Coffey James N
• Austin Jennifer J

Classifications

• C09J153/00 Primary

  Adhesives based on block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Adhesives based on derivatives of such polymers · CPC title

• C09J2423/10

  Presence of homo or copolymers of propene · CPC title

• C09J123/142 Primary

  at least partially crystalline copolymers of propene with other olefins · CPC title

• C09J7/0221

  Chemistry & Metallurgy · mapped topic

• C09J2453/00

  Presence of block copolymer · CPC title