# US 8,772,365 B2 · Resin composition for foams and uses thereof

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- Number: US 8,772,365 B2
- Document ID: US8772365B2
- Status: Granted
- Kind: B2
- Application number: 11/920,505
- Filed: 2006-05-17
- Published: 2009-04-23
- Granted: 2014-07-08
- Earliest claimed: 2005-05-19
- Assignees: Mitsui Chemicals, Inc.
- Applicants: Takayuki Kajihara; Eiji Shiba; Masayoshi Yamaguchi; Kiminori Noda
- Inventors: Takayuki Kajihara; Eiji Shiba; Masayoshi Yamaguchi; Kiminori Noda
- Web page: https://patentgrep.com/patent/US8772365B2

## CPC

- C08J 9/0061: {characterized by the use of several polymeric components}
- A43B 13/04: Plastics, rubber or vulcanised fibre
- B32B 5/18: characterised by features of a layer {of} foamed material
- B32B 25/08: of synthetic resin
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08L 23/08: Copolymers of ethene (C08L23/16 takes precedence)
- C08L 23/0815: {with aliphatic 1-olefins containing one carbon-to-carbon double bond}
- C08J 2323/04: Homopolymers or copolymers of ethene
- 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
- C08J 2453/00: Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- Y10T 428/249953: Composite having voids in a component [e.g., porous, cellular, etc.]
- 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
- 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

The present invention provides a resin composition capable of providing foams (non-crosslinked and crosslinked foams) which have low specific gravity and low compression set (CS) and are excellent in tensile strength properties, tear strength properties and vibration-damping properties at room temperature to high temperatures, and a foam of the resin composition. The resin composition for foams of the present invention comprises 5 to 95 parts by weight of an ethylene/α-olefin copolymer (A) and 5 to 95 parts by weight of a hydrogenated copolymer (B) obtained by hydrogenating a copolymer comprising a conjugated diene and a vinyl aromatic compound, and is characterized in that the hydrogenated copolymer (B) does not have a glass transition point of not higher than −10° C. when measured at a frequency of 1 Hz in accordance with JIS-K7198.

## Claims

### Claim 1

A resin composition for foams, comprising 80 to 95 parts by weight of an ethylene/α-olefin copolymer (A) and 5 to 20 parts by weight of a hydrogenated copolymer (B) obtained by hydrogenating a copolymer consisting of a conjugated diene and a vinyl aromatic compound, wherein the hydrogenated copolymer (B) does not have a glass transition point equal to or lower than −10° C. when measured at a frequency of 1 Hz in accordance with JIS-K7198, and 5 to 50 parts by weight of at least one resin (C) selected from the group consisting of rosin-based resins, terpene-based resins and petroleum resins and/or 5 to 100 parts by weight of an ethylene/polar monomer copolymer (D) based on 100 parts by weight of the total of the ethylene/α-olefin copolymer (A) and the hydrogenated copolymer (B).

### Claim 2 (depends on 1)

The resin composition for foams as claimed in claim 1, wherein the resin (C) has a softening point, as measured by a ring and ball method, of 40 to 180° C.

### Claim 3 (depends on 1)

The resin composition for foams as claimed in claim 1, which further comprises a blowing agent (E).

### Claim 4 (depends on 1)

The resin composition for foams as claimed in claim 1, wherein the ethylene/α-olefin copolymer (A) has the following properties:
the ethylene/α-olefin copolymer (A) is an ethylene/α-olefin copolymer comprising ethylene and an α-olefin of 3 to 20 carbon atoms and has a density (ASTM D1505, 23° C.) of 0.857 to 0.910 g/cm3, a melt flow rate (MFR2) (ASTM D 1238, load of 2.16 kg, 190° C.), as measured at 190° C. under a load of 2.16 kg, of 0.1 to 40 g/10 min and a molecular weight distribution index, Mw/Mn, as evaluated by a GPC method, of 1.5 to 3.0.

### Claim 5 (depends on 1)

A foam obtained by heat-treating the resin composition of claim 1.

### Claim 6 (depends on 5)

A foam obtained by subjecting the foam of claim 5 to secondary compression.

### Claim 7 (depends on 5)

The foam as claimed in claim 5, which has a peak temperature of tan δ, as determined in the dynamic viscoelasticity measurement, of 0 to 60° C.

### Claim 8 (depends on 5)

The foam as claimed in claim 5, which has a gel content of not less than 70% and a specific gravity of not more than 0.6.

### Claim 9 (depends on 5)

A laminate having a layer comprising the foam of claim 5 and a layer comprising at least one material selected from the group consisting of a polyolefin, a polyurethane, a rubber, a leather and a synthetic leather.

### Claim 10 (depends on 5)

Footwear comprising the foam of claim 5.

### Claim 11 (depends on 5)

A footwear part comprising the foam of claim 5.

### Claim 12 (depends on 11)

The footwear part as claimed in claim 11, which is a midsole, an inner sole or a sole.

### Claim 13 (depends on 9)

Footwear comprising the laminate of claim 9.

### Claim 14 (depends on 9)

A footwear part comprising the laminate of claim 9.