Graft-modified propylene alpha-olefin copolymers and methods for producing the same

Patent metadata

Field	Value
Publication number	US-2016355628-A1
Application number	US-201515117959-A
Country	US
Kind code	A1
Filing date	Feb 18, 2015
Priority date	Feb 19, 2014
Publication date	Dec 8, 2016
Grant date	—

Abstract

A graft-modified propylene.α-olefin copolymer (A) is obtained by graft-reacting a polar monomer onto a propylene.α-olefin copolymer (a) including 50 to 90 mol % of propylene-derived structural units (C3) and 10 to 50 mol % of C 4-8 α-olefin-derived structural units (Cα) (wherein the total of the structural units C3 and Cα is 100 mol %), and satisfies the following requirements (i) to (iv) at the same time: (i) the amount of the polar monomer grafted is 0.4 to 1.5 wt %, (ii) the content of the polar monomer is not more than 1000 ppm, (iii) the content of a gel insoluble in xylene at 140° C. is not more than 2.5 wt %, and (iv) the content of a volatile hydrocarbon compound is not more than 10 ppm.

First claim

1 . A graft-modified propylene.α-olefin copolymer (A) obtained by graft-reacting a polar monomer onto a propylene.α-olefin copolymer (a) comprising 50 to 90 mol % of propylene-derived structural units (C3) and 10 to 50 mol % of C 4-8 α-olefin-derived structural units (Cα) (wherein the total of the structural units C3 and Cα is 100 mol %), the graft-modified propylene.α-olefin copolymer satisfying the following requirements (i) to (iv) at the same time:
(i) the amount of the polar monomer grafted is 0.4 to 1.5 wt %,
(ii) the content of the polar monomer is not more than 1000 ppm,
(iii) the content of a gel insoluble in xylene at 140° C. is not more than 2.5 wt %, and
(iv) the content of a volatile hydrocarbon compound is not more than 10 ppm.

2 . The graft-modified propylene.α-olefin copolymer (A) according to claim 1 , which has an intrinsic viscosity measured at 135° C. in decalin of 0.5 to 1.0 (dl/g).

3 . The graft-modified propylene.α-olefin copolymer (A) according to claim 1 , wherein the propylene.α-olefin copolymer (a) satisfies the following requirements (1) to (3):
(1) the intrinsic viscosity measured at 135° C. in decalin is 0.1 to 12 (dl/g),
(2) the molecular weight distribution (Mw/Mn) measured by gel permeation chromatography (GPC) relative to polystyrenes is not more than 3.0, and
(3) the parameter value B representing a randomness of a comonomer sequence distribution is 1.0 to 1.5.

4 . The graft-modified propylene.α-olefin copolymer (A) according to claim 1 , wherein the C 4-8 α-olefin is 1-butene.

5 . The graft-modified propylene.α-olefin copolymer (A) according to claim 4 , wherein the propylene.α-olefin copolymer (a) further satisfies the requirements (4) and (5):
(4) the melting point Tm measured by differential scanning calorimetry (DSC) is 60 to 140° C., and the melting point Tm (T° C.) and the content of 1-butene-derived structural units (M mol %) satisfy −2.6M+130≦T≦−2.3M+155, and
(5) the degree of crystallinity (C %) measured by X-ray diffractometry and the content of 1-butene-derived structural units (M mol %) satisfy C≧−1.5M+75.

6 . The graft-modified propylene.α-olefin copolymer (A) according to claim 1 , wherein the polar monomer is maleic acid or maleic anhydride.

7 . The graft-modified α-olefin copolymer (A) according to claim 1 , which is produced by modifying the propylene.α-olefin copolymer (a) by melt-kneading, at a temperature of 120 to 220° C., a mixture including the propylene.α-olefin copolymer (a), 0.1 to 20 parts by weight of maleic anhydride (B) per 100 parts by weight of the copolymer (a), and 0.1 to 1.0 part by weight of an organic peroxide (C) per 100 parts by weight of the copolymer (a), the organic peroxide having a one-minute half-life decomposition temperature of 150 to 190° C.

8 . A method for producing a graft-modified propylene.α-olefin copolymer (A) comprising modifying a propylene.α-olefin copolymer (a) by melt-kneading, at a temperature of 120 to 220° C., a mixture including the propylene.α-olefin copolymer (a), 0.1 to 20 parts by weight of maleic anhydride (B) per 100 parts by weight of the copolymer (a), and 0.1 to 1.0 part by weight of an organic peroxide (C) per 100 parts by weight of the copolymer (a), the organic peroxide having a one-minute half-life decomposition temperature of 150 to 190° C.

9 . A resin composition comprising the graft-modified polypropylene.α-olefin copolymer (A) described in claim 1 , and one or more resins selected from polyamide resins and polypropylene resins.

Assignees

• Mitsui Chemicals Inc

Inventors

• Yoshimoto Koya
• Nakano Hidetake
• Nakamura Tetsuya

Classifications

• C08L2201/02

  Flame or fire retardant/resistant · CPC title

• C08L23/12

  Polypropene · CPC title

• C08L51/06

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C08F255/10 Primary

  on to butene polymers · CPC title

• C08L23/142

  at least partially crystalline copolymers of propene with other olefins · CPC title