# US 11,078,356 B2 · Polymer composition comprising at least one vinyl aromatic diene block copolymer and specific amounts of oil

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- Number: US 11,078,356 B2
- Document ID: US11078356B2
- Status: Granted
- Kind: B2
- Application number: 16/311,237
- Filed: 2017-06-26
- Published: 2019-08-01
- Granted: 2021-08-03
- Earliest claimed: 2016-06-29
- Assignees: Ineos Styrolution Group GmbH
- Applicants: Ineos Styrolution Group GmbH
- Inventors: Andrea Colombo; Michael Hamilton; Michiel Verswyvel; Eike Jahnke; Bernd Elbert; Norbert Niessner; Konrad Knoll
- Web page: https://patentgrep.com/patent/US11078356B2

## CPC

- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08J 3/201: {Pre-melted polymers}
- C08J 5/18: Manufacture of films or sheets
- C08L 91/00: Compositions of oils, fats or waxes; Compositions of derivatives thereof
- C08J 2353/02: of vinyl aromatic monomers and conjugated dienes
- C08J 2491/00: Characterised by the use of oils, fats or waxes; Derivatives thereof
- C08K 5/005: {Stabilisers against oxidation, heat, light, ozone}
- C08L 2207/322: Liquid component is processing oil
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

The present invention relates to a polymer composition comprising at least one block copolymer and a specific amount of at least one oil component. The block copolymer, which is the polymeric matrix of the inventive composition, is built up from at least one vinyl aromatic monomer MA and at least one conjugated diene monomer MB, in particular the block copolymer is a styrene butadiene block copolymer (SBC).

## Claims

### Claim 1

A polymer composition consisting of:
94.9 to 97.49% by weight, based on the total polymer composition:
at least one block copolymer P, having one of the following formulas (I) to (III):
(A-B/A)n-A (I),
X—[(B/A-A)n]m+1 (II),
Y—[(B/A-A)n]m+1 (III),
wherein the abbreviations and indices have the following meaning:
A is a vinyl aromatic block forming a hard phase, which is composed of at least one vinyl aromatic monomer MA,
B/A is a diene block forming a soft phase, which is composed of at least one conjugated diene monomer MB and at least one vinyl aromatic monomer MA,
X is the radical of an m+1-functional initiator,
Y is the radical of an m+1-functional coupling agent,
n is a natural number from 1 to 10, and
m is a natural number from 1 to 10;
2.5 to 5% by weight, based on the total polymer composition,
at least one oil component C, wherein the oil component is one or more paraffin oil; and
0.01 to 1% by weight, based on the total polymer composition, one or more further components E;
wherein:
the at least one block copolymer P comprises 40 to 75% by weight, based on the block copolymer P, of the at least one vinyl aromatic monomer MA and 25 to 60% by weight, based on the block copolymer P, of the at least one conjugated diene monomer MB;
the glass transition temperature's Tg of the vinyl aromatic block's A is/are above 25° C. and the glass transition temperature's Tg of the diene block's B/A is/are below 25° C.,
the proportion of the vinyl aromatic block's forming the hard phase is from 5 to 40% by volume, based on the total volume of block copolymer P;
the relative amount of 1,2 linkages in the diene block B/A, based on the sum of 1,2- and 1,4-cis/trans-linkages, is less than or equal to 15%; and
the weight average molecular weight Mw of the block copolymer P is in the range of 120,000 to 300,000 g/mol.

### Claim 2 (depends on 1)

The polymer composition according to claim 1, wherein the vinyl aromatic monomer MA is at least one monomer selected from the group consisting of styrene, α-methylstyrene, vinyltoluene, and 1,1-diphenylethylene, and the conjugated diene monomer MB is at least one monomer selected from the group consisting of butadiene and isoprene.

### Claim 3 (depends on 1)

The polymer composition according to claim 1, wherein the vinyl aromatic monomer MA is at least one monomer selected from the group consisting of styrene and α-methylstyrene, and the conjugated diene monomer MB is butadiene.

### Claim 4 (depends on 1)

The polymer composition according to claim 1, wherein the molecular weight of the vinyl aromatic block's A is/are in the range of 5,000 to 100,000 g/mol; and the molecular weight of the diene block's B/A is/are in the range of 20,000 to 250,000 g/mol.

### Claim 5 (depends on 1)

The polymer composition according to claim 1, wherein the glass transition temperature Tg of the vinyl aromatic block's A is/are above 50° C.; and the glass transition temperature Tg of the diene block's B/A is/are below 5° C.

### Claim 6 (depends on 1)

The polymer composition according to claim 1, wherein the relative amount of 1,2 linkages in the diene block B/A of the block copolymer P, based on the sum of 1,2- and 1,4-cis/trans-linkages, is less than or equal to 12%.

### Claim 7 (depends on 1)

The polymer composition according to claim 1, wherein the oil component C is at least one paraffin oil having a viscosity in the range of 20 to 300 m Pas, measured at a temperature in the range of 20 to 25° C.

### Claim 8 (depends on 1)

The polymer composition according to claim 1, wherein the block copolymer P is obtained by a process which comprises the step of forming the block copolymer by sequential anionic polymerization, where at least the polymerization step of the at least one block B/A takes place in the presence of a potassium salt as randomizer.

### Claim 9 (depends on 1)

A moulded part made from the polymer composition according to claim 1.

### Claim 10 (depends on 9)

The moulded part according to claim 9, wherein the moulded part is selected from extruded sheets, extruded multilayer sheets, extruded tubings, multilumen tubings, drip chamber parts, food packagings, beakers, plates, and labels.

### Claim 11 (depends on 1)

A process for the production of the polymer composition according to claim 1, wherein the at least one block copolymer P is mixed with the at least one oil component C, and optionally further components E.

### Claim 12 (depends on 11)

The process according to claim 11, wherein the components are mixed by melt extrusion.