Light weight fiber reinforced polypropylene composition

Patent metadata

Field	Value
Publication number	US-2018371210-A1
Application number	US-201616062377-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Dec 23, 2015
Publication date	Dec 27, 2018
Grant date	—

Abstract

The invention is related to a new fiber reinforced polypropylene composition with reduced weight and maintained mechanical properties, as well as articles formed therefrom.

First claim

1 . A fiber reinforced polymer composition comprising
(a) from 10 to 85 wt %, based on the total weight of the fiber reinforced polymer composition, of a polypropylene (PP), (b) from 12.5 to 53 wt %, based on the total weight of the fiber reinforced polymer composition, of fibers (F), (c) from 2 to 12 wt %, based on the total weight of the fiber reinforced polymer composition, of glass bubbles (GB), and (d) from 0.5 to 5 wt.-%, based on the total weight of the fiber reinforced polymer composition, of a polar modified polypropylene (PMP) as coupling agent.

2 . A fiber reinforced polymer composition according to claim 1 , wherein the polypropylene (PP) comprises a propylene homopolymer (H-PP) and/or a propylene copolymer (C-PP).

3 . A fiber reinforced polymer composition according to claim 1 or 2 , wherein the polypropylene (PP) comprises a heterophasic propylene copolymer (HECO) comprising
(a) a polypropylene matrix (M) being a propylene homopolymer or a propylene copolymer, and
(b) an elastomeric propylene copolymer (E) comprising units derived from propylene and
ethylene and/or C4 to C20 α-olefin.

4 . A fiber reinforced polymer composition according to claim 3 , wherein the heterophasic propylene copolymer (HECO) has
(a) A melt flow rate MFR2 (230° C.), measured according to ISO1133, in the range of 1.0 to 50 g/10 min, (b) A comonomer content in the range of 3.0 to 25 wt %, based on the total heterophasic propylene copolymer (HECO), and (c) A xylene soluble content (XCS) in the range of 10 to 50 wt %, based on the total heterophasic propylene copolymer (HECO).

5 . A fiber reinforced polymer composition according to any one of the preceding claims, wherein the fiber reinforced polymer composition further comprises up to 20 wt %, based on the total weight of the fiber reinforced polymer composition, of an elastomeric polymer impact modifier (IM).

6 . A fiber reinforced polymer composition according to any one of the preceding claims, wherein the fibers (F) have an average diameter of from 8 to 20 μm and an aspect ratio of 125 to 650.

7 . A fiber reinforced polymer composition according to any one of the preceding claims, wherein the fibers (F) are selected from the group consisting of glass fibers, metal fibers, mineral fibers, ceramic fibers and mixtures thereof.

8 . A fiber reinforced polymer composition according to any one of the preceding claims, wherein the glass bubbles (GB) have an average diameter of 10-50 μm.

9 . A fiber reinforced polymer composition according to any one of the preceding claims, wherein the polar modified polypropylene (PMP) is a propylene copolymer grafted with maleic anhydride, preferably the propylene copolymer grafted with maleic anhydride comprises ethylene as comonomer units.

10 . An automotive article comprising the fiber reinforced polymer composition according to any one of the preceding claims.

11 . A foamed article comprising the fiber reinforced polymer composition according to any one of the claims 1 to 9 .

Assignees

• Borealis Ag

Inventors

• Dix Albrecht
• Hartl Anna
• Mitter Franz

Classifications

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L51/06

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

• C08L2207/02

  Heterophasic composition · CPC title

• C08K7/28 Primary

  Glass · CPC title

• C08L23/12

  Polypropene · CPC title