	US 11,851,587 B2
	Permanently tacky adhesives with improved environmental compatibility
Jeremia Schwabe, Augsburg (DE); Erik Hauck, Pirmasens (DE); and Gerd Hohner, Augsburg (DE)
Assigned to CLARIANT INTERNATIONAL LTD, Muttenz (CH)
Appl. No. 17/047,722
Filed by Clariant International Ltd, Muttenz (CH)
PCT Filed Apr. 8, 2019, PCT No. PCT/EP2019/058834 § 371(c)(1), (2) Date Oct. 15, 2020, PCT Pub. No. WO2019/201649, PCT Pub. Date Oct. 24, 2019.
Claims priority of application No. 10 2018 109 269.5 (DE), filed on Apr. 18, 2018.
Prior Publication US 2021/0147726 A1, May 20, 2021
Int. Cl. C09J 123/14 (2006.01); C09J 123/16 (2006.01); C09J 123/08 (2006.01); C09J 7/38 (2018.01); C08F 210/06 (2006.01)

CPC C09J 123/14 (2013.01) [C08F 210/06 (2013.01); C08F 2500/08 (2013.01); C08F 2500/12 (2013.01); C08F 2500/17 (2013.01); C08F 2500/32 (2021.01); C09J 2301/302 (2020.08); C09J 2301/414 (2020.08); C09J 2423/10 (2013.01)]

19 Claims

1. A resin- and mineral oil-free pressure-sensitive adhesive composition, comprising 55%-99% by weight of a copolymer of propylene and one or more further monomers selected from ethylene and 1-olefins having 4 to 20 carbon atoms,

wherein the copolymer has been prepared with the aid of metallocene catalysts and has

a melt viscosity at 170° C. of 20 to 8000 mPas (DIN 53019),

a density of 0.84 to 0.90 g/cm³(23° C., ISO 1183),

a glass transition temperature of less than −30° C. (DIN EN ISO 11357-2:2014),

a flow point, measured according to ASTM D97, of less than 50° C., and

wherein a further polymer may optionally be present in the pressure-sensitive adhesive composition.

17. A method of joining substrates comprising wetting and adhesively bonding the substrates with the pressure-sensitive adhesive composition as claimed in claim 1.

18. The method as claimed in claim 17 wherein the substrates comprise a substrate with a surface energy of less than 35 mN/m and one or more substrates with any surface energy.

19. The method as claimed in claim 18 wherein the substrate with a surface energy of less than 35 mN/m is a substrate made from Teflon or a substrate having a siliconized surface.