# US 10,865,301 B2 · Hydrogenated rubber with improved performance in TPE compositions

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- Number: US 10,865,301 B2
- Document ID: US10865301B2
- Status: Granted
- Kind: B2
- Application number: 15/746,601
- Filed: 2016-07-21
- Published: 2018-08-02
- Granted: 2020-12-15
- Earliest claimed: 2015-07-24
- Assignees: Dynasol Elastomeros, S.A.
- Applicants: Dynasol ElastóMeros S.A.
- Inventors: María Ángela Cruz Tejedor; Luisa María Fraga Trillo; Inés Alonso Zapirain
- Web page: https://patentgrep.com/patent/US10865301B2

## CPC

- C08L 53/025: {modified}
- C08F 8/04: Reduction, e.g. hydrogenation
- C08F 297/044: {using a coupling agent}
- C08K 5/0016: {Plasticisers}
- C08K 5/01: Hydrocarbons {(C08K5/0091 takes precedence)}
- C08L 23/12: Polypropene
- C08F 2800/20: as weight or mass percentages
- C08L 2203/02: for biomedical use
- C08L 2203/10: used for bottles
- C08L 2207/04: Thermoplastic elastomer
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

New hydrogenated styrenic block copolymers, in particular styrene-ethylene/butylene-styrene copolymers (SEBS copolymers), with improved performance in thermoplastic elastomer compositions (TPE compositions), process for preparing said hydrogenated styrenic block copolymers, reprocessable TPE-S compositions made thereof, method for producing an article from said reprocessable TPE-S compositions and articles made of said reprocessable TPE-S compositions, in particular suitable for medical applications.

## Claims

### Claim 1

A TPE-S composition, wherein it comprises:
a) at least one radial hydrogenated styrenic block copolymer of the formula [A-B]nX, wherein A is a block based on aromatic vinyl monomers which are styrene derivatives having 8 to 20 carbon atoms, B is a block based on conjugated diene monomers having 4 to 10 carbon atoms, n>2 and X is a coupling agent residue, wherein the radial hydrogenated styrenic block copolymer has a molecular weight, expressed as Mpeak, between 300,000 and 475,000, a vinyl content of between 60% and 69%, a styrene content of 25 to 40% and a viscosity, expressed as Brookfield viscosity at 5% by weight in toluene, of less than 40 cps;
b) at least a thermoplastic resin; and
c) at least a plasticizer agent;
wherein the TPE-S composition exhibits a hardness between 20 and 60° ShA, a compression set % lower than 5% measured at room temperature after 22 hours compression, a melt flow rate between 5 and 25 MFR (g/10′) at 230° C./5 kg, and a permeability to O2 in the range of 30,000 and 80,000 cc-mil/m2/day/atm).

### Claim 2 (depends on 1)

The TPE-S composition according to claim 1, wherein the plasticizer/hydrogenated styrenic block copolymer weight ratio is equal to or lower than 0.5.

### Claim 3 (depends on 1)

The TPE-S composition according to claim 1, wherein the amount of thermoplastic resin is between 10 and 100 phr, wherein “phr” means per hundred parts of hydrogenated styrenic block component.

### Claim 4 (depends on 1)

An article wherein it comprises a TPE-S composition as defined in claim 1.

### Claim 5 (depends on 4)

The article according to claim 4, wherein it is selected from the group consisting of medical devices, stoppers, closures, plugs, bottle caps/seals, vial seals and penetrable septa.

### Claim 6 (depends on 2)

The TPE-S composition according to claim 2, wherein the amount of thermoplastic resin is between 10 and 100 phr, wherein “phr” means parts per hundred of hydrogenated styrenic block component.

### Claim 7 (depends on 1)

The TPE-S composition according to claim 1, wherein it has melt flow rate between 5 and 15 MFR (g/10′) at 230° C./5 kg.

### Claim 8 (depends on 1)

The TPE-S composition according to claim 1, wherein the radial hydrogenated styrenic block copolymer has a molecular weight, expressed as Mpeak, of between 400,000 to 450,000.

### Claim 9 (depends on 1)

The TPE-S composition according to claim 1, wherein the radial hydrogenated styrenic block copolymer has a viscosity, expressed as Brookfield viscosity at 5% by weight in toluene, of 33 cps or less.

### Claim 10 (depends on 1)

The TPE-S composition according to claim 1, wherein the radial hydrogenated styrenic block copolymer is a styrene-ethylene/butylene-styrene copolymer.

### Claim 11 (depends on 1)

The TPE-S composition according to claim 1, wherein the radial hydrogenated styrenic block copolymer has a vinyl content of between 60% and 68%.

### Claim 12 (depends on 1)

The TPE-S composition according to claim 1, wherein the radial hydrogenated styrenic block copolymer has a molecular weight, expressed as Mpeak, of between 400,000 to 425,000.