Resin composition, and molded article and pipe formed from said composition

Patent metadata

Field	Value
Publication number	US-10414915-B2
Application number	US-201615765643-A
Country	US
Kind code	B2
Filing date	Oct 3, 2016
Priority date	Oct 19, 2015
Publication date	Sep 17, 2019
Grant date	Sep 17, 2019

Abstract

The purpose of the present invention is to provide: a vinyl chloride resin composition having exceptional impact resistance, processability, and heat resistance. The present invention provides: a resin composition that contains 3-15 parts by mass of a rubber-based impact-absorbing material and 0.1-10 parts by mass of a modified olefin wax per 100 parts by mass of a vinyl chloride resin. This resin composition satisfies the following requirements (I)-(III). (I) The chlorine content of the vinyl chloride resin is 55-75% by mass. (II) The glass transition temperature (Tg) in differential scanning calorimetry (DSC) of the rubber-based impact-absorbing material (B) is 0° C. or lower. (III) The modified olefin wax contains at least one polar group selected from halogens and carboxylic acid derivatives, and the polar group content is within the range of 0.1-50% by mass.

First claim

The invention claimed is:

1. A resin composition, comprising 3 to 15 parts by mass of rubber-based impact absorber (B) and 0.1 to 10 parts by mass of modified olefin wax (C) with respect to 100 parts by mass of vinyl chloride-based resin (A), and satisfying the following requirements (I) to (III):
(I) the vinyl chloride-based resin (A) has a chlorine content of 55 to 75 mass %;
(II) the rubber-based impact absorber (B) has a glass transition temperature (Tg), measured by differential scanning calorimetry (DSC), of 0° C. or less; and
(III) the modified olefin wax (C) contains at least one polar group selected from a halogen and a carboxylic acid derivative, a content of the polar group being in a range of 0.1 to 50 mass %.

2. The resin composition according to claim 1 , wherein the chlorine content in the vinyl chloride-based resin (A) is 60 to 75 mass % in the requirement (I).

3. The resin composition according to claim 1 , wherein the rubber-based impact absorber (B) contains a rubber component selected from a butadiene rubber, an acrylic rubber and a silicone rubber.

4. The resin composition according to claim 1 , wherein the modified olefin wax (C) is a product obtained by introducing a polar group into a homopolymer obtained from one selected from ethylene and α-olefins having 3 to 12 carbon atoms, or a copolymer obtained from two or more selected from ethylene and α-olefins having 3 to 12 carbon atoms.

5. The resin composition according to claim 1 , wherein the modified olefin wax (C) satisfies the following requirements (i) to (iv):
(i) a number average molecular weight (Mn) measured by gel permeation chromatography (GPC) in terms of polystyrene is in a range of 300 to 20,000;
(ii) a softening point measured according to JIS K2207 is in a range of 70 to 170° C.;
(iii) a density measured by a density-gradient tube method is in a range of 830 to 1,200 kg/m 3 ; and
(iv) an acid value is 10 to 200 mgKOH/g.

6. The resin composition according to claim 1 , wherein the modified olefin was (C) is a carboxylic acid-modified product of an unmodified olefin wax (c), or an oxide of the unmodified olefin wax (c).

7. The resin composition according to claim 1 , wherein the modified olefin wax (C) is a maleic anhydride-modified product of an unmodified olefin wax (c).

8. The resin composition according to claim 1 , wherein a sea-island structure is observed with a transmission electron microscope (TEM) in a visual field of 16.6 μm 2 , and the number of island phases having a particle size of 0.2 μm or more is 40 or more.

9. The resin composition according to claim 1 , wherein a sea-island structure is observed with a transmission electron microscope (TEM) in a visual field of 16.6 μm 2 , and the number of island phases having a particle size of 0.2 μm or more and 2.0 μm or less is 40 or more.

10. A molded article, comprising the resin composition according to claim 1 .

11. A pipe, comprising the resin composition according to claim 1 .

Assignees

• Mitsui Chemicals Inc

Inventors

• Kanaya Hirotaka
• Kawabe Kuniaki
• Takahashi Yosuke
• Ito Toshiyuki

Classifications

• C08L27/24 Primary

  halogenated · CPC title

• C08L23/26

  modified by chemical after-treatment (saponified copolymers C08L23/0861; unsaturated acid salts C08L23/0876) · CPC title

• C08L51/04

  grafted on to rubbers · CPC title

• C08L27/06 Primary

  Homopolymers or copolymers of vinyl chloride · CPC title

• C08L2203/18

  used for pipes · CPC title