# US 11,993,410 B2 · Packaged viscoelastic polymer substance

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- Number: US 11,993,410 B2
- Document ID: US11993410B2
- Status: Granted
- Kind: B2
- Application number: 17/293,651
- Filed: 2019-11-13
- Published: 2022-01-13
- Granted: 2024-05-28
- Earliest claimed: 2018-11-13
- Assignees: Tesa SE
- Applicants: tesa SE
- Inventors: Klaus Massow; Volker Lass; Kay Brandes
- Web page: https://patentgrep.com/patent/US11993410B2

## CPC

- B65B 29/00: Packaging of materials presenting special problems
- C08L 33/04: Homopolymers or copolymers of esters {(C08L43/04 takes precedence)}
- B29C 48/0011: {combined with compression moulding}
- B29C 48/0019: {combined with shaping by flattening, folding or bending}
- B29C 48/28: Storing of extruded material, e.g. by winding up or stacking
- B29C 48/919: {using a bath, e.g. extruding into an open bath to coagulate or cool the material}
- B65B 9/20: the webs being formed into tubes in situ around the filling nozzles
- B65B 61/24: for shaping or reshaping completed packages
- B65B 63/08: for heating or cooling articles or materials to facilitate packaging
- B65D 65/38: Packaging materials of special type or form
- C08J 3/18: Plasticising macromolecular compounds (plasticisers C08K)
- C09J 7/24: based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J 133/08: Homopolymers or copolymers of acrylic acid esters
- C09J 133/10: Homopolymers or copolymers of methacrylic acid esters
- B29K 2033/08: {Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate}
- B29K 2105/0097: {Glues or adhesives, e.g. hot melts or thermofusible adhesives}
- C08J 2333/08: Homopolymers or copolymers of acrylic acid esters
- C08J 2333/10: Homopolymers or copolymers of methacrylic acid esters
- C08J 2423/06: Polyethene
- C08J 2423/08: Copolymers of ethene (C08J2423/16 takes precedence)
- C08J 2423/12: Polypropene
- B65B: MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING (bundling and pressing devices for cigars A24C1/44; devices for tensioning and securing binders adapted to be supported by the article or articles to be bound B25B25/00; applying closure members to bottles, jars or similar containers B67B1/00-B67B6/00; concurrent cleaning, filling and closing of bottles B67C7/00; emptying bottles, jars, cans, casks, barrels or similar containers B67C9/00)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## 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.

## Claims

### 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, the protective polymer film having no self-adhesive properties and having been brought into a tubular form before said continuous dispensing so as to be filled with the plastified viscoelastic polymer substance, thereby forming 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 during said continuous dispensing 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 cooled flattened strandlike polymer assembly onto a reel, wherein the strandlike polymer assembly wound onto the reel has a length of more than 30 meters.

### Claim 2 (depends on 1)

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

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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

### Claim 5 (depends on 1)

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

### Claim 6 (depends on 1)

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

### Claim 7 (depends on 1)

The method of claim 1, wherein the plastified viscoelastic polymer substance has a viscosity of more than 250 Pas during said continuous dispensing into the tubular protective polymer film.

### Claim 8 (depends on 1)

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

### Claim 9 (depends on 1)

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

### Claim 10 (depends on 1)

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

### Claim 11 (depends on 1)

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

### Claim 12 (depends on 1)

A method comprising:
plastifying the packaged viscoelastic polymer substance formed according to claim 1 under the influence of heat and shear.

### Claim 13 (depends on 12)

The method of claim 12, further comprising:
treating the packaged viscoelastic polymer substance with said heat and shear such that the protective polymer film is plastified.

### Claim 14 (depends on 13)

The method of claim 13, wherein the treatment with heat and shear is carried out in an extruder.