Damping thermoplastic elastomers

Patent metadata

Field	Value
Publication number	US-2016230000-A1
Application number	US-201615040151-A
Country	US
Kind code	A1
Filing date	Feb 10, 2016
Priority date	Feb 11, 2015
Publication date	Aug 11, 2016
Grant date	—

Abstract

A thermoplastic elastomer compound includes styrenic block copolymer and high softening point tackifier. The styrenic block copolymer has a Copolymer Tan Delta Peak Temperature and the thermoplastic elastomer compound has a Compound Tan Delta Peak Temperature. The Compound Tan Delta Peak Temperature is greater than the Copolymer Tan Delta Peak Temperature. The thermoplastic elastomer compound exhibits useful damping properties at or above room temperature while also advantageously possessing improved stability for processing and/or applications at high temperatures and upon exposure to weathering.

First claim

What is claimed is:

1 . A thermoplastic elastomer compound comprising:
(a) styrenic block copolymer having a Copolymer Tan Delta Peak Temperature; and (b) tackifier having a softening point of at least about 80° C. according to ASTM 6493; and wherein the compound has a Compound Tan Delta Peak Temperature, and the Compound Tan Delta Peak Temperature is greater than the Copolymer Tan Delta Peak Temperature.

2 . The compound of claim 1 , wherein the compound is essentially free of styrene-(ethylene-ethylene/propylene)-styrene block copolymer and low vinyl styrene-(ethylene/butylene)-styrene block copolymer.

3 . The compound of claim 1 , wherein the styrenic block copolymer is selected from at least one of hydrogenated styrene-isoprene-styrene block copolymer with hydrogenated vinylic isoprene midblock and high vinyl styrene-(ethylene/butylene)-styrene block copolymer.

4 . The compound of claim 1 , wherein the Copolymer Tan Delta Peak Temperature is greater than −40° C. but less than −10° C.

5 . The compound of claim 1 , wherein the Compound Tan Delta Peak Temperature is at least −10° C.

6 . The compound of claim 1 , wherein the tackifier has a softening point ranging from about 80° C. to about 150° C. according to ASTM 6493.

7 . The compound of claim 1 , wherein the tackifier has a weight average molecular weight ranging from about 400 to about 3,500.

8 . The compound of claim 1 , wherein the tackifier comprises a saturated cyclo-aliphatic amorphous hydrocarbon resin.

9 . The compound of claim 1 , wherein the tackifier is present in an amount ranging from about 20 parts by weight to about 200 parts by weight, per 100 parts by weight of the styrenic block copolymer.

10 . The compound of claim 1 , wherein the compound further comprises plasticizer.

11 . The compound of claim 1 , wherein the compound further comprises secondary polymer.

12 . The compound of claim 1 , wherein the compound further comprises filler.

13 . The compound of claim 1 , wherein the compound further comprises at least one additive selected from the group consisting of adhesion promoters; biocides; anti-fogging agents; anti-static agents; blowing and foaming agents; bonding agents and bonding polymers; dispersants; flame retardants and smoke suppressants; impact modifiers; initiators; lubricants; micas; pigments, colorants and dyes; processing aids; release agents; silanes, titanates and zirconates; slip and anti-blocking agents; stabilizers; stearates; ultraviolet light absorbers; viscosity regulators; waxes; and combinations of any of the aforementioned additives.

14 . The compound of claim 1 , wherein the compound comprises:
(a) 100 parts by weight of the styrenic block copolymer; (b) from about 20 to about 200 parts by weight of the tackifier; (c) from 0 to about 200 parts by weight of optional plasticizer; (d) from 0 to about 300 parts by weight of optional secondary polymer; (e) from 0 to about 150 parts by weight of optional filler; and (f) from 0 to about 100 parts by weight of optional other additives.

15 . A plastic article formed from the compound of claim 1 .

16 . A multi-component plastic article comprising at least two components formed from different thermoplastic materials, wherein at least one of the different thermoplastic materials is the compound of claim 1 and at least one other of the at least two components is a thermoplastic substrate onto which the compound of claim 1 is overmolded.

17 . The multi-component plastic article of claim 16 , wherein the thermoplastic substrate comprises polyamide, and the compound further comprises a bonding agent selected from the group consisting of maleic anhydride functionalized polyolefin, maleic anhydride functionalized styrenic block copolymer, and combinations thereof.

18 . The multi-component plastic article of claim 16 , wherein the thermoplastic substrate comprises polyolefin, and the compound further comprises a bonding agent of polyolefin.

19 . The multi-component plastic article of claim 16 , wherein the thermoplastic substrate comprises a thermoplastic material selected from the group consisting of thermoplastic polyurethane, polycarbonate, polycarbonate/acrylonitrile butadiene styrene, and polybutylene terephthalate/polycarbonate, and the compound further comprises a bonding agent selected from thermoplastic polyurethane, copolyester elastomer, and blends of thermoplastic polyurethane and copolyester elastomer.

20 . The article of claim 15 , wherein the article is in the form of a molded article, an extruded article, a thermoformed article, a calendered article, or an additive 3-D printed article.

Assignees

• Polyone Corp

Inventors

• Gu Jiren

Classifications

• C08L2207/04

  Thermoplastic elastomer · CPC title

• B32B25/042

  of natural rubber or synthetic rubber · CPC title

• B32B2250/24

  All layers being polymeric · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• B32B2307/51

  Elastic · CPC title