Polypropylene-based resin composition and molded article thereof

Patent metadata

Field	Value
Publication number	US-9522992-B1
Application number	US-201514809476-A
Country	US
Kind code	B1
Filing date	Jul 27, 2015
Priority date	Jul 27, 2015
Publication date	Dec 20, 2016
Grant date	Dec 20, 2016

Abstract

The present invention provides a resin composition including: (a): 75 to 97% by mass of a polypropylene-based resin; (b): 1 to 15% by mass of a polyphenylene ether-based resin having a reduced viscosity (ηsp/c: measured as a 0.5 g/dL chloroform solution at 30° C.) of 0.25 to 0.36 dL/g; and (c): 2 to 19% by mass of a hydrogenated block copolymer which is a hydrogenated product of a block copolymer including at least two polymer blocks A mainly including a vinyl aromatic compound and at least one polymer block B mainly including a conjugated diene compound, wherein the polymer block A has a number average molecular weight (MncA) of 4,000 to 8,000 excluding 8,000, and a mass ratio ((b)/(c)) of the component (b) to the component (c) is 10/90 to 60/40.

First claim

What is claimed is:

1. A resin composition comprising:
(a): 75 to 97% by mass of a polypropylene-based resin;
(b): 1 to 15% by mass of a polyphenylene ether-based resin having a reduced viscosity (ηsp/c) of 0.25 to 0.36 dL/g, measured as a 0.5 g/dL chloroform solution at 30° C.; and
(c): 2 to 19% by mass of a hydrogenated block copolymer which is a hydrogenated product of a block copolymer comprising at least two polymer blocks A mainly comprising a vinyl aromatic compound and at least one polymer block B mainly comprising a conjugated diene compound, wherein
the at least two polymer blocks A have a number average molecular weight (MncA) of 4,000 to less than 8,000, and
a mass ratio ((b)/(c)) of the component (b) to the component (c) is 10/90 to 60/40, and
a total amount of the conjugated diene compound bonded by a 1,2-vinyl bond or a 3,4-vinyl bond is 35 to 55 mol % based on the total conjugated diene compound in the component (c) in a bonding form of the conjugated diene compound in the polymer block B of the block copolymer before the component (c) is hydrogenated.

2. The resin composition according to claim 1 , wherein the mass ratio ((b)/(c)) of the component (b) to the component (c) is 20/80 to 60/40.

3. The resin composition according to claim 1 , wherein the total amount of conjugated diene compound bonded by a 1,2-vinyl bond or a 3,4-vinyl bond is 40 to 55 mol % based on the total conjugated diene compound in the component (c) in a bonding form of the conjugated diene compound in the polymer block B of the block copolymer before the component (c) is hydrogenated.

4. The resin composition according to claim 1 , wherein the content of the vinyl aromatic compound in the component (c) is 12 to 30% by mass based on the total amount of the component (c).

5. The resin composition according to claim 1 , wherein the component (c) has a number average molecular weight (Mnc) of 100,000 or less.

6. The resin composition according to claim 1 , wherein the component (b) has a number average molecular weight (Mnb) of 7,000 to 15,000.

7. The resin composition according to claim 1 , wherein the polypropylene-based resin (a) is a homo-polypropylene and/or a block-polypropylene and has a melt flow rate of 0.1 to 100 g/10 minutes as measured at 230° C. under a load of 2.16 kg according to ISO 1133.

8. The resin composition according to claim 2 , wherein the polypropylene-based resin (a) is a homo-polypropylene and/or a block-polypropylene and has a melt flow rate of 0.1 to 100 g/10 minutes as measured at 230° C. under a load of 2.16 kg according to ISO 1133.

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

Assignees

• Asahi Kasei Chemicals Corp

Inventors

• I Shunichiro

Classifications

• C08L23/10 Primary

  Homopolymers or copolymers of propene · CPC title

• C08L53/00

  Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers · CPC title

• C08L71/123

  not modified by chemical after-treatment · CPC title

• C08L71/12

  Polyphenylene oxides · CPC title

• C08L23/12 Primary

  Polypropene · CPC title