# US 12,006,431 B2 · Overmolding thermoplastic elastomer compounds having high bio-based content

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- Number: US 12,006,431 B2
- Document ID: US12006431B2
- Status: Granted
- Kind: B2
- Application number: 17/294,174
- Filed: 2019-11-11
- Published: 2022-01-13
- Granted: 2024-06-11
- Earliest claimed: 2018-11-16
- Assignees: Avient Corporation
- Applicants: Avient Corporation
- Inventors: Liang Xu
- Web page: https://patentgrep.com/patent/US12006431B2

## CPC

- C08L 67/00: Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain (of polyester-amides C08L77/12; of polyester-imides C08L79/08); Compositions of derivatives of such polymers
- B32B 27/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/22: using plasticisers
- B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers}
- B32B 27/308: {comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- B32B 27/36: comprising polyesters
- B32B 27/365: {comprising polycarbonates}
- C08L 53/025: {modified}
- C08L 67/025: {containing polyether sequences}
- B32B 25/08: of synthetic resin
- B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)}
- B32B 2250/24: All layers being polymeric
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/4026: within the layer by addition of a colorant, e.g. pigments, dyes
- B32B 2307/536: Hardness
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/748: Releasability
- B32B 2457/00: Electrical equipment
- B32B 2509/00: Household appliances
- B32B 2535/00: Medical equipment, e.g. bandage, prostheses or catheter
- B32B 2605/00: Vehicles
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/025: containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
- C08L 2205/03: containing three or more polymers in a blend
- C08L 2205/035: containing four or more polymers in a blend
- 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)
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM

## Abstract

Thermoplastic elastomer compounds include (a) hydrogenated styrene-farnesene-styrene block copolymer, (b) thermoplastic polyester elastomer having a bio-based content of at least about 45%, (c) polyolefin having a bio-based content of at least about 95%, (d) secondary styrenic block copolymer such as styrene-ethylene/butylene-styrene block copolymer, and (e) plasticizer. The thermoplastic elastomer compounds have a bio-based content of at least about 40%. Additionally, the thermoplastic elastomer compounds have an adhesion of at least about 10 pli according to a 90° Peel Test on at least one of acrylonitrile butadiene styrene, polycarbonate/acrylonitrile butadiene styrene, and polycarbonate. The thermoplastic elastomer compounds can be especially useful for making overmolded thermoplastic articles.

## Claims

### Claim 1

A thermoplastic elastomer compound comprising:
(a) from about 10 to about 65 weight percent, by weight of the compound, of a hydrogenated styrene-farnesene-styrene block copolymer;
(b) from about 10 to about 65 weight percent, by weight of the compound, of a thermoplastic polyester elastomer having a bio-based content of at least about 45%;
(c) from about 2 to about 20 weight percent, by weight of the compound, of a polyolefin having a bio-based content of at least about 95%;
(d) from about 2 to about 20 weight percent, by weight of the compound, of a secondary styrenic block copolymer;
(e) from about 2 to about 20 weight percent, by weight of the compound, of a plasticizer;
(f) from 0 to about 15 weight percent, by weight of the compound, of a hydrocarbon resin; and
(g) from 0 to about 10 weight percent, by weight of the compound, of one or more additives selected from the group consisting of antioxidants; colorants; ultraviolet light absorbers; waxes; and combinations thereof;
wherein the compound has a bio-based content of at least about 40%; and
wherein the compound has an adhesion of at least about 10 pli according to a 90° Peel Test on at least one of acrylonitrile butadiene styrene, polycarbonate/acrylonitrile butadiene styrene, and polycarbonate.

### Claim 2 (depends on 1)

The compound of claim 1, wherein the compound has a bio-based content of at least about 50%.

### Claim 3 (depends on 1)

The compound of claim 1, wherein the compound has an adhesion of at least about 10 pli according to a 90° Peel Test on each of acrylonitrile butadiene styrene (ABS), polycarbonate/acrylonitrile butadiene styrene (PC/ABS), and polycarbonate (PC).

### Claim 4 (depends on 1)

The compound of claim 1, wherein the secondary styrenic block copolymer is selected from styrene-ethylene/butylene-styrene (SEBS) block copolymer, styrene-ethylene/propylene-styrene (SEPS) block copolymer, styrene-ethylene/ethylene/propylene-styrene (SEEPS) block copolymer, styrene-isobutylene-styrene (SIBS) block copolymer, styrene-butadiene-styrene (SBS) block copolymer, styrene-isoprene-styrene (SIS) block copolymer, and combinations thereof.

### Claim 5 (depends on 1)

The compound of claim 1, wherein the compound includes from about 2 to about 10 weight percent, by weight of the compound, of the hydrocarbon resin.

### Claim 6 (depends on 1)

The compound of claim 1, wherein the compound further comprises two or more additives selected from the group consisting of antioxidants; colorants; ultraviolet light absorbers; waxes; and combinations thereof.

### Claim 7 (depends on 1)

The compound of claim 1, wherein the hydrogenated styrene-farnesene-styrene block copolymer and the thermoplastic polyester elastomer are present at a weight ratio ranging from about 1:2 to about 2:1.

### Claim 8 (depends on 1)

The compound of claim 1, wherein the hydrogenated styrene-farnesene-styrene block copolymer comprises a combination of a first grade of hydrogenated styrene-farnesene-styrene block copolymer and a second grade of hydrogenated styrene-farnesene-styrene block copolymer, wherein the first grade of hydrogenated styrene-farnesene-styrene block copolymer has a first melt flow rate and a first hardness and the second grade of hydrogenated styrene-farnesene-styrene block copolymer has a second melt flow rate different from the first melt flow rate and a second hardness different from the first hardness.

### Claim 9 (depends on 8)

The compound of claim 8, wherein the first grade of hydrogenated styrene-farnesene-styrene block copolymer and the second grade of hydrogenated styrene-farnesene-styrene block copolymer are present at a weight ratio ranging from about 1:3 to about 3:1.

### Claim 10 (depends on 1)

A thermoplastic article molded from the thermoplastic elastomer compound of claim 1.

### Claim 11 (depends on 1)

An overmolded thermoplastic article comprising:
(a) an overmold portion molded from the thermoplastic elastomer compound of claim 1; and
(b) a substrate portion molded from a thermoplastic resin compound comprising thermoplastic resin selected from the group consisting of acrylonitrile butadiene styrene (ABS), polycarbonate/acrylonitrile butadiene styrene (PC/ABS), and polycarbonate (PC);
wherein the overmold portion is bonded onto the substrate portion at a bond interface, and the bond interface is free of adhesive.

### Claim 12 (depends on 1)

A method of making an overmolded thermoplastic article having a substrate portion and an overmold portion, the method comprising the steps of:
(a) providing the thermoplastic elastomer compound of claim 1;
(b) providing a thermoplastic resin compound comprising thermoplastic resin selected from the group consisting of acrylonitrile butadiene styrene, polycarbonate/acrylonitrile butadiene styrene, and polycarbonate;
(c) molding the thermoplastic resin compound to provide the substrate portion; and
(d) overmolding the thermoplastic elastomer compound to provide the overmold portion, wherein the overmold portion is bonded onto the substrate portion at a bond interface, and wherein the bond interface is free of adhesive, thereby providing the overmolded thermoplastic article.