PSA containing olefin block copolymers and styrene block copolymers

Patent metadata

Field	Value
Publication number	US-9732258-B2
Application number	US-201414284770-A
Country	US
Kind code	B2
Filing date	May 22, 2014
Priority date	Nov 22, 2011
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

The invention relates to storage-stable hot-melt adhesive containing 15 to 70 wt % of a mixture of at least one copolymer based on ethylene and/or propylene and at least one C4 to C20 α-olefin which is obtainable as a block copolymer by metallocene-catalyzed polymerization, and at least one styrene block copolymer, 10 to 70 wt % of at least one tackifying resin, 0 to 40 wt % of further additives, wherein the total of the percentages should amount to 100% and the tackifying resin is entirely or in part a soft resin.

First claim

We claim:

1. A hot-melt adhesive comprising:
(A) a mixture of (i) 15 to 30 wt % a metallocene-catalyzed block copolymer, which is an ethylene and/or propylene and at least one C4 to C20 α-olefin, and (ii) 5 to 25 wt % of a styrene block copolymer;
(B) 10 to 40 wt % of at least one tackifying resin, wherein the at least one tackifying resin is entirely liquid at room temperature; and
(C) 0 to 40 wt % of further additives selected from plasticizer, wax, stabilizer, adhesion promoter, antioxidant, light stabilizer, colorant, rheological agent, and mixtures thereof;
wherein the total amount of the at least one tackifying resin and the plasticizer is from 10 to 35 wt %;
wherein the sum of the %-shares should amount to 100%; and
wherein the viscosity of the hot-melt adhesive is between 10000 mPas and 50,000 mPas at 150° C.

2. The hot-melt adhesive according to claim 1 wherein the styrene block copolymer is selected from non-hydrogenated block copolymers.

3. The hot-melt adhesive according to claim 2 wherein the styrene block copolymer is selected from the group consisting of SIS, SBS and SIBS.

4. The hot-melt adhesive according to claim 1 wherein the hot-melt adhesive is cloudy at room temperature.

5. The hot-melt adhesive according to claim 1 wherein the plasticizer include a nonpolar plasticizers selected from the group consisting of synthetic oils, paraffinic oils, naphthenic oils, poly(isobutylene) oils and mixtures thereof.

Assignees

• Henkel Ag & Co Kgaa

Inventors

• Puerkner Eckhard
• Seiler Annie

Classifications

• C09J193/00

  Adhesives based on natural resins; Adhesives based on derivatives thereof · CPC title

• C09J153/02

  Vinyl aromatic monomers and conjugated dienes · CPC title

• 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

• C08L53/02

  of vinyl-aromatic monomers and conjugated dienes · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title