Packaged viscoelastic polymer substance

Patent metadata

Field	Value
Publication number	US-2022010079-A1
Application number	US-201917293651-A
Country	US
Kind code	A1
Filing date	Nov 13, 2019
Priority date	Nov 13, 2018
Publication date	Jan 13, 2022
Grant date	—

Abstract

Packaged viscoelastic polymer substances and methods for the production of the packaged viscoelastic polymer substances are provided. The packaged viscoelastic polymer substances are further processable under the influence of heat and shear.

First claim

1 . A method for producing a packaged viscoelastic polymer substance, the method comprising:
a) plastifying a viscoelastic polymer substance at elevated temperatures, the viscoelastic polymer substance being a polymer substance based on poly(meth)acrylates having a weight-average molecular weight of 500,000 g/mol or more; b) continuously dispensing the plastified viscoelastic polymer substance into a protective polymer film, that has no self-adhesive properties and which, before being filled with the plastified viscoelastic polymer substance, has been brought into a tubular form, to give a strandlike polymer assembly having a diameter of 55 to 70 mm, a core of the plastified viscoelastic polymer substance, and a shell of the protective polymer film, wherein a fraction of the protective polymer film, based on a total weight of the protective polymer film and the plastified viscoelastic polymer substance, is less than 1.0 wt %, and wherein the plastified viscoelastic polymer substance has a viscosity of more than 100 Pas at the instant of being dispensed into the tubular protective polymer film; c) converting the strandlike polymer assembly into a flattened strandlike polymer assembly with a smallest cross-section having a ratio of width to height of about 2:1 to 7:1; d) cooling the flattened strandlike polymer assembly to a temperature at which the strandlike polymer assembly is still plastically deformable; and e) subsequently winding the flattened strandlike polymer assembly onto a reel, wherein the strandlike polymer assembly wound onto the reel has a length of more than 30 meters.

2 . The method of claim 1 , wherein the converting of the strandlike polymer assembly into the flattened strandlike polymer assembly in c) is carried out by means of rolls.

3 . The method of claim 1 , wherein the cooling in d) is carried out down to a core temperature of less than 100° C.

4 . The method of claim 1 , wherein the strandlike polymer assembly in e) is first passed through an opening in the end face of the reel and secured there.

5 . The method of claim 1 , wherein d) takes place in a water bath.

6 . The method of claim 1 , wherein the plastifying in a) is carried out in an extruder.

7 . The method of claim 1 , wherein the plastified viscoelastic polymer substance has a viscosity of more than 250 Pas at the instant of being dispensed into the tubular protective polymer film.

8 . The method of claim 1 , wherein the fraction of the protective polymer film in b), based on the total weight of protective polymer film and plastified viscoelastic polymer substance, is less than 0.5 wt %.

9 . The method of claim 1 , wherein the protective polymer film consists of polyethylene, polypropylene, ethylene-vinyl acetate, or a mixture thereof.

10 . The method of claim 1 , wherein the viscoelastic polymer substance is a self-adhesive composition or is convertible into a self-adhesive composition.

11 . The method of claim 1 , wherein the viscoelastic polymer substance has a density at 25° C. of 1.05 to 1.3 g/cm3.

12 . A packaged viscoelastic polymer substance obtainable by the method of claim 1 .

13 . A method comprising:
plastifying the packaged viscoelastic polymer substance of claim 12 under the influence of heat and shear.

14 . The method of claim 13 , further comprising:
treating the packaged viscoelastic polymer substance with heat and shear for further processing such that the protective polymer film is plastified.

15 . The method of claim 14 , wherein the treatment with heat and shear is carried out in an extruder.

Assignees

• Tesa Se

Inventors

• Massow Klaus
• Lass Volker
• Brandes Kay

Classifications

• C09J133/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title

• C08J2423/08

  Copolymers of ethene (C08J2423/16 takes precedence) · CPC title

• C08L33/04 Primary

  Homopolymers or copolymers of esters {(C08L43/04 takes precedence)} · CPC title

• C08J2333/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C08J2333/10

  Homopolymers or copolymers of methacrylic acid esters · CPC title