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Psa containing olefin block copolymers and styrene block copolymer

A styrene block and copolymer technology, used in film/sheet adhesives, adhesive types, adhesives, etc., to solve problems such as reduced cohesion, cracked adhesive layers, and failures

Active Publication Date: 2014-07-23
HENKEL KGAA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the tack is increased e.g. by plasticizers, the cohesion decreases, allowing the adhesive layer to crack and the bond to fail

Method used

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  • Psa containing olefin block copolymers and styrene block copolymer
  • Psa containing olefin block copolymers and styrene block copolymer
  • Psa containing olefin block copolymers and styrene block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040]

[0041] Viscosity: 27500mPas, 150℃

[0042] Viscosity: 15300mPas, 170℃

[0043] In a thin layer, the adhesive is opaque solid or molten (visual assessment).

[0044] Liner film (PE, 50 μm) was coated with about 250 g.

[0045] After cooling, the film was bonded to a glass plate, pushed with a roller (1 kg) and stored at 25°C for 24 hours. The bond strength was then measured at the indicated times.

[0046] 20min 50N / 25mm

[0047] 24h 60N / 25mm

[0048] 3d 60N / 25mm

[0049] Even after storage, the bond remains the same and no incompatible ingredients bleed out.

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Abstract

The invention relates to a 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 alpha-olefin, which can be obtained 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, and 0 to 40 wt% of additional additives, wherein the sum of the % shares should equal 100% and the tackifying resin is completely or partially a soft resin.

Description

technical field [0001] The invention relates to hotmelt adhesives prepared on the basis of olefin block copolymers and styrene block copolymers, to which further additives suitable as pressure-sensitive adhesives have been added. Background technique [0002] Hot melt adhesives suitable for bonding various materials are well known. In EP0912646, it is described that ethylene and at least one C 3 to C 20 A substantially linear copolymer of alpha-olefin monomers prepares hot melt adhesives. WO 00 / 00565 also describes hot melt adhesives based on linear alpha-olefin copolymers. Common auxiliary components such as tackifying resins, waxes, other different polymers, styrenic block copolymers, plasticizers or other additives are described therein. Bonding of paper and cardboard materials is described as the intended use, as well as use as adhesive tape or for gluing books. Olefin block copolymers are not described. [0003] WO2006 / 102150 describes based on selected C 2 - Adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J153/00C09J153/02C09J7/02C09J193/00C09J7/04
CPCC09J153/00C09J153/02C09J193/00C08L23/18C08L53/02C08L93/00C08L2205/02C08L2205/03C09J7/387C09J147/00
Inventor E·普尔克奈尔A·塞勒
Owner HENKEL KGAA
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