Polypropylene composite

Patent metadata

Field	Value
Publication number	US-9309395-B2
Application number	US-201314421612-A
Country	US
Kind code	B2
Filing date	Aug 20, 2013
Priority date	Aug 27, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

Fiber reinforced composition comprising (a) a polypropylene random copolymer comprising ethylene and/or C 4 to C 8 α-olefin (PP-RACO), (b) fibers (F), and (c) a polar modified polypropylene as adhesion promoter (AP), wherein (i) the polypropylene random copolymer comprising ethylene and/or C 4 to C 8 α-olefin (PP-RACO) heaving a melt flow rate MFR 2 (230° C.) measured according to ISO 1133 of at least 5 g/10 min, (ii) the fibers (F) are selected from the group consisting of glass fibers, metal fibers, ceramic fibers and graphite fibers, and (iii) the polymer contained in the reinforced composition forms a continuous phase being the matrix of the fiber reinforced composition.

First claim

The invention claimed is:

1. Fiber reinforced composition consisting essentially of:
(a) a polypropylene random copolymer comprising ethylene and/or C 4 to C 8 α-olefin (PP-RACO),
(b) fibers (F), and
(c) a polar modified polypropylene as adhesion promoter (AP),
(d) optionally a masterbatch, and
(e) optionally one or more additives,
wherein;
(i) the polypropylene random copolymer comprising ethylene and/or C 4 to C 8 α-olefin (PP-RACO) having a melt flow rate MFR 2 (230 ° C.) measured according to ISO 1133 of at least 5 g/10min,
(ii) the fibers (F) are selected from the group consisting of glass fibers, metal fibers, ceramic fibers and graphite fibers, and
(iii) the complete polymer contained in the reinforced composition forms a continuous phase being the matrix of the fiber reinforced composition.

2. Fiber reinforced composition according to claim 1 , wherein the polypropylene random copolymer (PP-RACO) comprises 1.0 to 5.0 wt. % of ethylene and/or C 4 to C 8 α-olefin.

3. Fiber reinforced composition according to claim 1 , wherein the polypropylene random copolymer (PP-RACO) has a xylene cold soluble content (XCS) measured according ISO 16152 (23° C.) of not more than 20wt. %.

4. Fiber reinforced composition according to claim 1 , wherein the polypropylene random copolymer (PP-RACO) has a monomodal, bimodal or multimodal molecular weight or comonomer distribution.

5. Fiber reinforced composition according to claim 1 , wherein the overall melt flow rate MFR 2 (230° C.) measured according to ISO 1133 is at least 4 g/10min.

6. Fiber reinforced composition according to claim 1 , wherein the overall tensile modulus is at least 5000 MPa.

7. Fiber reinforced composition according to claim 1 , wherein the fibers (F) are glass fibers.

8. Fiber reinforced composition according to claim 1 , wherein the composition consists essentially of:
(a) 30 to 75 wt. % of a polypropylene random copolymer comprising ethylene and/or C 4 to C 8 α-olefin (PP-RACO),
(b) 20 to 45 wt. % fibers (F), and
(c) 0.5 to 5.0 wt. % of a polar modified polypropylene as adhesion promoter (AP),
(d) 0.0 to 3.0 wt. % of a masterbatch,
(e) 0.0 to 3.0 wt. % of one or more additives, based on the total weight of the fiber reinforced composition.

9. Automotive article comprising the fiber reinforced composition according to claim 1 .

10. A foamed article, comprising the fiber reinforced composition according to claim 1 .

11. Process for the preparation of the fiber reinforced composition according to claim 1 , comprising the steps of adding:
(a) polypropylene random copolymer (PP-RACO),
(b) the fibers (F), and
(c) the polar modified polypropylene as adhesion promoter (AP) to an extruder and extruding the same obtaining said fiber reinforced composition.

Assignees

• Borealis Ag

Inventors

• Hemmeter Markus
• Gahleitner Markus
• Tranninger Cornelia
• Doshev Petar
• Jerabek Michael

Classifications

• C08L23/142 Primary

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

• C08L23/14 Primary

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

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08K7/14

  Glass · CPC title

• C08L23/0869

  with unsaturated acids, e.g. [meth]acrylic acid; with unsaturated esters, e.g. [meth]acrylic acid esters · CPC title