	US 12,031,068 B2
	Adhesive tape with a poorly flowable pressure-sensitive adhesive and release liner based on a pressure-sensitive silicone coating
Nikolay Belov, Hamburg (DE); Tobias Winkler, Hamburg (DE); and Birgit Sommer, Norderstedt (DE)
Assigned to tesa SE, Norderstedt (DE)
Appl. No. 16/965,412
Filed by tesa SE, Norderstedt (DE)
PCT Filed Jan. 15, 2019, PCT No. PCT/EP2019/050982 § 371(c)(1), (2) Date Jul. 28, 2020, PCT Pub. No. WO2019/145194, PCT Pub. Date Aug. 1, 2019.
Claims priority of application No. 10 2018 201 328.4 (DE), filed on Jan. 29, 2018.
Prior Publication US 2021/0032508 A1, Feb. 4, 2021
Int. Cl. C09J 7/00 (2018.01); C09J 7/38 (2018.01); C09J 7/40 (2018.01)

CPC C09J 7/401 (2018.01) [C09J 7/385 (2018.01); C09J 2301/304 (2020.08); C09J 2483/005 (2013.01); Y10T 428/1457 (2015.01); Y10T 428/1476 (2015.01); Y10T 428/2839 (2015.01)]

13 Claims

1. A laminate, comprising:

A) at least one release liner that comprises at least one carrier layer (CL) and at least one silicone coating (SC), wherein the at least one silicone coating (SC) comprises an addition-crosslinked, pressure-sensitive silicone adhesive derived from:

a) at least one organopolysiloxane having a weight-average molecular weight M_wof 30,000 to 2,000,000 g/mol and comprising at least one diorganosiloxane unit and at least two silicon-bonded alkenyl groups,

b) at least one compound for crosslinking the a) at least one organopolysiloxane, wherein the at least one compound comprises at least two silicon-bonded hydrogen atoms,

c) at least one silicone resin having a weight-average molecular weight M_wof 500 to 29,999 g/mol and comprising at least one structural unit (R¹₃SiO_1/2), (R¹SiO_3/2), (R¹₂SiO_2/2) or (SiO_4/2), in which the R¹is an organic group, and

d) a catalyst for accelerating a reaction of the a), b) and c); and

B) at least one further layer (L1) that comprises a polyacrylate-based adhesive comprising α,β-unsaturated acrylic acid or acrylates,

wherein a weight ratio of the (a) at least one organopolysiloxane to the (c) at least one silicon resin is 1:1 to 1:3,

wherein the a) at least one organopolysiloxane is at a total amount of 20 to 60 parts by weight, the b) at least one compound is at a total amount of 3 to 4 parts by weight and the c) at least one silicone resin is at a total amount of 30 to 75 parts by weight, as based on a sum total of the a), b) and c) at 100 parts by weight, and

further wherein the at least one silicone coating (SC) has a Release Force of 140 to 190 cN/cm.