# US 10,308,747 B2 · Modified polypropylene-based resin, polypropylene-based resin expanded sheet, expanded resin-made container, and method for producing modified polypropylene-based resin

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- Number: US 10,308,747 B2
- Document ID: US10308747B2
- Status: Granted
- Kind: B2
- Application number: 15/500,676
- Filed: 2015-09-29
- Published: 2017-08-03
- Granted: 2019-06-04
- Earliest claimed: 2014-10-30
- Assignees: Sekisui Plastics Co., Ltd.
- Applicants: Sekisui Plastics Co., Ltd.
- Inventors: Kohei Tazumi; Eiji Fukuyama; Michihiro Hayashi; Shota Endo; Masashi Yamashita
- Web page: https://patentgrep.com/patent/US10308747B2

## CPC

- C08F 255/02: on to polymers of olefins having two or three carbon atoms
- C08J 9/0061: {characterized by the use of several polymeric components}
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08J 9/14: organic
- C08J 9/141: {Hydrocarbons}
- C08J 2201/03: Extrusion of the foamable blend
- C08J 2203/14: Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
- C08J 2205/052: Closed cells, i.e. more than 50% of the pores are closed
- C08J 2323/12: Polypropene
- C08J 2351/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08J 2423/12: Polypropene
- C08J 2451/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- 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)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

To obtain a modified polypropylene-based resin which shows specific viscoelasticity and from which an expanded sheet having a low open cell ratio can be obtained.

## Claims

### Claim 1

A modified polypropylene-based resin obtained by reacting a polypropylene-based resin with an organic peroxide and an aromatic vinyl monomer and having a phase angle determined with a frequency dispersion dynamic viscoelasticity measurement at 200° C. of 30° or more and 70° or less at a frequency of 0.01 Hz, wherein
the organic peroxide is contained at a ratio of 0.1 parts by mass or more and 1.0 parts by mass or less based on 100 parts by mass of the polypropylene-based resin,
the aromatic vinyl monomer is contained at a ratio of 0.1 parts by mass or more and 3.0 parts by mass or less based on 100 parts by mass of said polypropylene-based resin, and
the organic peroxide is any mono-peroxide selected from t-butylperoxy 2-ethylhexyl carbonate, t-hexylperoxy isopropyl monocarbonate, t-butylperoxy isopropyl monocarbonate, t-hexylperoxy benzoate, dibenzoyl peroxide, di(4-methylbenzoyl) peroxide, diisopropylperoxy dicarbonate, and t-butylperoxy benzoate.

### Claim 2 (depends on 1)

The modified polypropylene-based resin according to claim 1, which has a melt mass flow rate of 2.0 g/10 minutes or less.

### Claim 3

A polypropylene-based resin expanded sheet comprising a modified polypropylene-based resin obtained by reacting a polypropylene-based resin with an organic peroxide and an aromatic vinyl monomer, wherein the modified polypropylene-based resin has a phase angle determined with a frequency dispersion dynamic viscoelasticity measurement at 200° C. of 30° or more and 70° or less at a frequency of 0.01 Hz, wherein
the organic peroxide is contained at a ratio of 0.1 parts by mass or more and 1.0 parts by mass or less based on 100 parts by mass of the polypropylene-based resin,
the aromatic vinyl monomer is contained at a ratio of 0.1 parts by mass or more and 3.0 parts by mass or less based on 100 parts by mass of said polypropylene-based resin, and
the organic peroxide is any mono-peroxide selected from t-butylperoxy 2-ethylhexyl carbonate, t-hexylperoxy isopropyl monocarbonate, t-butylperoxy isopropyl monocarbonate, t-hexylperoxy benzoate, dibenzoyl peroxide, di(4-methylbenzoyl) peroxide, diisopropylperoxy dicarbonate, and t-butylperoxy benzoate.

### Claim 4 (depends on 3)

The polypropylene-based resin expanded sheet according to claim 3, further comprising a polypropylene-based resin different from said modified polypropylene-based resin.

### Claim 5 (depends on 3)

An expanded resin-made container obtained by thermally molding the polypropylene-based resin expanded sheet according to claim 3.

### Claim 6

A method for producing a modified polypropylene-based resin, the method comprising:
melt-kneading a resin composition including a polypropylene-based resin, an organic peroxide, and an aromatic vinyl monomer to prepare a modified polypropylene-based resin having a phase angle determined with a frequency dispersion dynamic viscoelasticity measurement at 200° C. of 30° or more and 70° or less at a frequency of 0.01 Hz, wherein
said resin composition containing 0.1 parts by mass or more and 1.0 parts by mass or less of said organic peroxide based on 100 parts by mass of said polypropylene-based resin, and containing 0.1 parts by mass or more and 3.0 parts by mass or less of said aromatic vinyl monomer based on 100 parts by mass of said polypropylene-based resin, and
the organic peroxide is any mono-peroxide selected from t-butylperoxy 2-ethylhexyl carbonate, t-hexylperoxy isopropyl monocarbonate, t-butylperoxy isopropyl monocarbonate, t-hexylperoxy benzoate, dibenzoyl peroxide, di(4-methylbenzoyl) peroxide, diisopropylperoxy dicarbonate, and t-butylperoxy benzoate.

### Claim 7 (depends on 4)

An expanded resin-made container obtained by thermally molding the polypropylene-based resin expanded sheet according to claim 4.