# US 8,541,504 B2 · Impact absorber composition

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 8,541,504 B2
- Document ID: US8541504B2
- Status: Granted
- Kind: B2
- Application number: 12/527,782
- Filed: 2008-02-19
- Published: 2010-03-18
- Granted: 2013-09-24
- Earliest claimed: 2007-02-20
- Assignees: Asahi Kasei Chemicals Corporation
- Applicants: Yasuhiro Kusanose; Yoshifumi Araki
- Inventors: Yasuhiro Kusanose; Yoshifumi Araki
- Web page: https://patentgrep.com/patent/US8541504B2

## CPC

- C08J 9/0061: {characterized by the use of several polymeric components}
- A43B 13/187: {Resiliency achieved by the features of the material, e.g. foam, non liquid materials}
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 21/08: of synthetic resin
- B32B 27/20: using fillers, pigments, thixotroping agents
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08F 297/04: polymerising vinyl aromatic monomers and conjugated dienes
- C08L 53/02: of vinyl-aromatic monomers and conjugated dienes
- C08L 53/025: {modified}
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2274/00: Thermoplastic elastomer material
- B32B 2307/56: Damping, energy absorption
- B32B 2419/00: Buildings or parts thereof
- B32B 2437/02: Gloves, shoes
- B32B 2605/00: Vehicles
- C08J 2201/024: Preparation or use of a blowing agent concentrate, i.e. masterbatch in a foamable composition
- C08J 2203/04: N2 releasing, ex azodicarbonamide or nitroso compound
- C08J 2353/02: of vinyl aromatic monomers and conjugated dienes
- C08J 2423/00: Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- Y10T 428/24066: Wood grain
- 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)
- A43B: CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Provided in this invention is an impact absorber composition comprising a copolymer containing an aromatic vinyl compound, wherein the peak of tan δ of the copolymer obtained from the measurement of the dynamic viscoelasticity is in the range of more than 0° C. to 20° C. or less, the value of tan δ is 0.4 or more in the whole temperature range of 5° C. to 15° C., and the value of tan δ at 15° C. is 0.5 or more.

## Claims

### Claim 1

An impact absorber composition comprising a copolymer containing an aromatic vinyl compound, wherein a tan δ peak determined from a measurement of dynamic viscoelasticity (at 1 Hz) of the copolymer is in a range from more than 0° C. to 20° C. or less, a tan δ value of the copolymer is 0.4 or more in a whole temperature range of 5° C. to 15° C., the tan δ value of the copolymer at 15° C. is 0.5 or more, and content of the aromatic vinyl compound in the copolymer containing the aromatic vinyl compound is more than 50% by weight.

### Claim 2 (depends on 1)

The impact absorber composition according to claim 1, wherein the copolymer containing the aromatic vinyl compound is a copolymer (which may have been hydrogenated) composed principally of an aromatic vinyl compound and a conjugated diene, and/or a copolymer composed principally of an aromatic vinyl compound and alkylene.

### Claim 3 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, wherein the tan δ peak determined from the measurement of dynamic viscoelasticity (at 1 Hz) of the copolymer containing the aromatic vinyl compound is in a range of 2° C. to 15° C., and the tan δ value of the copolymer at 15° C. is 0.55 or more.

### Claim 4 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, wherein the tan δ value determined from the measurement of dynamic viscoelasticity (at 1 Hz) of the copolymer containing the aromatic vinyl compound is 0.5 or more in the whole temperature range of 5° C. to 15° C.

### Claim 5 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, wherein a modulus of rigidity G′ at −5° C. determined from the measurement of dynamic viscoelasticity (at 1 Hz) of the copolymer containing the aromatic vinyl compound is 500 MPa or less, and the modulus of rigidity G′ at 40° C. is 4 MPa or less.

### Claim 6 (depends on 2)

The impact absorber composition according to claim 2, wherein a ratio of hydrogenation to the double bonds based on a pre-hydrogenation conjugated diene compound in the copolymer containing the aromatic vinyl compound is 5% or more to 97% or less.

### Claim 7 (depends on 2)

The impact absorber composition according to claim 2, wherein the ratio of hydrogenation to the double bonds based on the pre-hydrogenation conjugated diene compound in the copolymer containing the aromatic vinyl compound is 10% or more to 70% or less.

### Claim 8 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, wherein a weight-average molecular weight of the copolymer containing the aromatic vinyl compound is 50,000 or more to 500,000 or less.

### Claim 9 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, wherein the copolymer containing the aromatic vinyl compound comprises at least a copolymer block composed principally of alkylene and an aromatic vinyl compound, and/or a copolymer block (S) composed principally of a conjugated diene and an aromatic vinyl compound.

### Claim 10 (depends on 9)

The impact absorber composition according to claim 9, wherein a content of vinyl derived from the pre-hydrogenation conjugated diene in the copolymer block (S), or an amount of α-olefin having 3 or more carbon atoms derived from alkylene is in a range of 5% or more to 60% or less.

### Claim 11 (depends on 9)

The impact absorber composition according to claim 9, wherein the copolymer block (S) comprises a copolymer composed principally of a conjugated diene and an aromatic vinyl compound and has two or more segments differing in content of the aromatic vinyl compound, and a difference in content of the aromatic vinyl compound between any two segments is 5% by weight or more.

### Claim 12 (depends on 11)

The impact absorber composition according to claim 11, wherein the copolymer block (S) contains two adjoining segments differing in content of aromatic vinyl compound by 5% by weight or more.

### Claim 13 (depends on 11, 12)

The impact absorber composition according to claim 11 or 12, wherein the segments differing in the content of the aromatic vinyl compound comprise a segment (S1) of a monomeric composition having an aromatic vinyl compound content of 25 to 55% by weight, and a segment (S2) of a monomeric composition having an aromatic vinyl compound content of 55 to 80% by weight, and amounts of the segments S1 and S2 are each 30% by weight or more based on the copolymer block (S).

### Claim 14

A process for producing a copolymer containing an aromatic vinyl compound by anionic polymerization, which comprises:
a step of polymerizing a copolymer block (S) composed principally of an aromatic vinyl compound and a conjugated diene,
wherein the step of polymerizing the copolymer block (S) is carried out by supplying the aromatic vinyl compound and the conjugated diene to a polymerization tank for polymerization by changing a ratio of the aromatic vinyl compound to the conjugated diene, or by portioning a monomeric mixture differing in a ratio of the aromatic vinyl compound to the conjugated diene in two or more stages.

### Claim 15 (depends on 14)

The process for producing a copolymer containing an aromatic vinyl compound according to claim 14, wherein the step of polymerizing the copolymer block (S) comprises a step of supplying the aromatic vinyl compound and the conjugated diene to a polymerization tank as a monomeric mixture (M1) having the aromatic vinyl compound content of 25 to 55% by weight for polymerization, and a step of supplying the aromatic vinyl compound and the conjugated diene to a polymerization tank as a monomeric mixture (M2) which differs in composition from the M1 and has an aromatic vinyl compound content of 55 to 80% by weight for polymerization.

### Claim 16 (depends on 15)

The process for producing a copolymer containing an aromatic vinyl compound according to claim 15, wherein a difference in the aromatic vinyl compound content between the monomeric mixture (M1) and the monomeric mixture (M2) is 5 by weight or more to 30% by weight or less.

### Claim 17 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, which comprises the copolymer containing the aromatic vinyl compound and a thermoplastic resin other than the copolymer containing the aromatic vinyl compound, wherein a ratio by weight of the copolymer containing the aromatic vinyl compound to the thermoplastic resin is 95/5 to 5/95.

### Claim 18 (depends on 17)

The impact absorber composition according to claim 17, wherein the thermoplastic resin is a copolymer containing ethylene.

### Claim 19 (depends on 18)

The impact absorber composition according to claim 18, comprising the copolymer containing the aromatic vinyl compound, a thermoplastic resin containing 50% by weight or more of ethylene or an olefinic thermoplastic elastomer, and an inorganic filler.

### Claim 20 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, further comprising a foaming agent.

### Claim 21 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, further comprising a crosslinking agent.

### Claim 22 (depends on 1, 2)

The impact absorber composition according to claim 1 or 2, which has a specific gravity of 0.28 or more to 0.35 or less, a hardness at 22° C. of 47° or more to 53° or less, an impact resilience of 14% or less, and a peel strength of 27 N/cm or more.

### Claim 23 (depends on 1, 2)

A footwear using the impact absorber composition according to claim 1 or 2.

### Claim 24 (depends on 1, 2)

A laminate obtained by laminating the impact absorber composition according to claim 1 or 2 to a plywood.