US 12,716,011 B2Granted

Adhesive tape with polyurethane carrier

AssigneeTesa SE

InventorsFranziska Czerwonatis, Franciska Rademacher

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Abstract

The present invention relates to an adhesive tape comprising at least one carrier that has a thickness of 20 to 250 μm, preferably 50 to 150 μm, and has at least one layer (i) based on preferably uncrosslinked thermoplastic polyurethane that has been produced by means of extrusion, wherein the polyurethane is based on aromatic polyisocyanate, such as aromatic diisocyanate in particular, or (ii) based on preferably uncrosslinked polyurethane that has been produced from a dispersion, wherein a pressure-sensitive adhesive layer is disposed on at least one side, preferably both sides, of the carrier. The invention also relates to processes for producing the adhesive tape and to the use thereof for bonding of components in electrical, electronic, optical or precision mechanical devices, such as, in particular, of windows or lenses in housings of precision mechanical, optical and/or electronic devices.

Claims13

Dependent claims

An adhesive tape comprising:

(a) at least one carrier that has a thickness of 20 μm to 250 μm and comprises at least one layer comprising polyurethane foamed with microballoons, wherein the at least one layer comprising polyurethane foamed with microballoons has been produced from a dispersion comprising dispersed polyurethane into which the microballoons have been introduced, wherein the polyurethane is optionally crosslinked;
and
(b) a pressure-sensitive adhesive layer is disposed on at least one side of the carrier, wherein
the pressure-sensitive adhesive layer consists of:
(i) polyacrylate;
(ii) vinylaromatic block copolymer essentially immiscible with the polyacrylate;
(iii) at least one optional crosslinker;
(iv) at least one optional microballoon;
(v) at least one optional microbead;
and (vi) a combination thereof (i)-(v), and the pressure-sensitive adhesive layer comprises 50% to 90% by weight of the polyacrylate and 10% to 50% by weight of vinylaromatic block copolymer.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/404,506Filed 17 Aug 2021
Priority: DE 10 2020 210 503.019 Aug 2020
Published: US 2022/0056313 A124 Feb 2022
Granted: 25 Aug 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification31 codes

C09J 7/25
Plastics; Metallised plastics: based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated…
B05D 1/265
Performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface: extrusion…
B05D 5/10
Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures: to obtain an…
C08K 5/0025
Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59: crosslinking or vulcanising agents; including…