Reinforced molding material

• US 6,281,288 B1
• Filed: 03/03/1999
• Issued: 08/28/2001
• Est. Priority Date: 03/03/1998
• Status: Expired due to Fees

• Current Assignee: Degussa AG (Rag-Stiftung)
• Original Assignee: Evonik Degussa GmbH
• Inventors: Wey, Hans Guenther, Laven, Ralf, Bickert, Peter
• Primary Examiner(s): GORR, RACHEL F
• Application Number:
  US09/261,192
• Time in Patent Office: 909 Days
• Field of Search: 525/288, 525/383, 525/72, 524/855, 524/881, 524/858, 524/504
• US Class Current: 525/72
• CPC Class Codes: C08K 3/013 Fillers, pigments or reinforcing additives
• CPC Class Codes: C08K 7/14 Glass
• CPC Class Codes: C08L 101/00 Compositions of unspecified macromolecular compounds
• CPC Class Codes: C08L 23/02 not modified by chemical after-treatment
• CPC Class Codes: C08L 23/10 Homopolymers or copolymers of propene
• CPC Class Codes: C08L 23/14 Copolymers of propene C08L23/16 takes precedence
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/24 Graft or block copolymers according to groups C08L51/00, C08L53/00 or C08L55/02; Derivatives thereof
• CPC Class Codes: C08L 51/06 grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond

Abstract

A reinforced molding material having high tensile strength comprising:

(a) from 0 to 98 parts by weight of one or more thermoplastics,

(b) from 2 to 100 parts by weight of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon, this grafted polyolefin having a melt viscosity at 190° C. In the range from 100 to 50,000 maps and the parts by weight of (a) and (b) sunning to 100, and

(c) from 0.5 to 400 parts by weight of a reinforcing material. The molding material can be used, inter alia, for shaped articles, as hotmelt adhesives or for heavy-duty carpet backing materials.

Claims

1. A molding material which comprises:

(a) from 0 to 98 parts by weight of one or more thermoplastics,

(b) from 2 to 100 parts by weight of a grafted, substantially amorphous polyolefin of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon,

wherein said grafted, substantially amorphous polyolefin has a melt viscosity at 190°

C. in the range from 100 to 50,000 mPas and the parts by weight of (a) and (b) summing to 100, and

(c) from 0.5 to 400 parts by weight of a reinforcing material,

with the exception of those molding materials in which less than 28 parts by weight of barite are used as reinforcing material.

2. The molding material as claimed in claim 1, which comprises from 1 to 97 parts by weight of said thermoplastics.

3. The molding material as claimed in claim 1, which comprises from 10 to 96 parts by weight of said thermoplastics.

4. The molding material as claimed in claim 1, which comprises from 20 to 95 parts by weight of said thermoplastics.

5. The molding material as claimed in claim 1, wherein said thermoplastic is selected from the group consisting of a polyolefin, a polystyrene, a polyphenylene ether, a polycondensate, a polyurethane, a rubber and a mixture thereof.

6. The molding material as claimed in claim 1, wherein said substantially amorphous polyolefin is selected from the group consisting of an atactic polypropylene, an atactic poly-1-butene, an ethene/propene copolymer, an ethene/1-butene copolymer, an ethene/propene/1-butene terpolymer, a propene/1-butene copolymer, an ethene/propene/1-hexene terpolymer, an ethene/propene/1-octene terpolymer, an ethene/1-butene/1-hexene terpolymer, an ethene/1-butene/1-octene terpolymer, an ethene/1-hexene/1-octene terpolymer, a propene/1-butene/1-hexene terpolymer, a propene/1-butene/1-octene terpolymer, a propene/1-hexene/1-octene terpolymer and a mixture thereof.

7. The molding material as claimed in claim 1, wherein said substantially amorphous polyolefin comprises the following monomer composition:

from 0 to 95% by weight of an α

-olefin having 4 to 10 carbon atoms;

from 5 to 100% by weight of propene and

from 0 to 50% by weight of ethene.

8. The molding material as claimed in claim 7, wherein said substantially amorphous polyolefin comprises the following monomer composition:

from 3 to 95% by weight of an α

-olefin having 4 to 10 carbon atoms;

from 5 to 97% by weight of propene and

from 0 to 20% by weight of ethene.

9. The molding material as claimed in claim 1, wherein said grafted, substantially amorphous polyolefin has a melt viscosity in the range from 1000 to 30,000 mPas.

10. The molding material as claimed in claim 1, wherein said reinforcing material selected from the group consisting of a filler, a fibrous reinforcing material and a mixture thereof.

11. The molding material as claimed in claim 1, which comprises from 4 to 200 parts by weight of said reinforcing material.

12. The molding material as claimed in claim 1, which comprises from 8 to 100 parts by weight of said reinforcing material.

13. The molding material as claimed in claim 10, which comprises either a fibrous reinforcing material or at least 28 parts by weight of a filler.

14. The molding material as claimed in claim 1, which comprises at least 28 parts by weight of said reinforcing material.

15. The molding material as claimed in claim 1, wherein said reinforcing material is selected from the group consisting of alumina, talc, barite, clay powder, silica, carbon black, calcium carbonate, titanium dioxide, mica, kaolinite, glass flakes, kieselguhr, glass beads, glass fibers, carbon fibers, single crystal filaments and a mixture thereof.

16. The molding material as claimed in claim 1, further comprising a crosslinking accelerator.

17. The molding material as claimed in claim 1, wherein said grafted, substantially amorphous polyolefin is crosslinked.

18. A process for the preparation of the molding material as claimed in claim 1, wherein said reinforcing material is incorporated into a melt of said grafted, substantially amorphous polyolefin.

19. The process for the preparation of the molding material as claimed in claim 1, wherein said reinforcing material is incorporated into a melt of said substantially amorphous polyolefin and grafting is then carried out by metering in said silane and a free radical donor.

20. The process for the preparation of the molding material as claimed in claim 1, wherein a mixture which is obtained as claimed in either of claims 18 and 19 is mixed with said thermoplastic or thermoplastics (component (a)).

21. The process as claimed in claim 20, wherein said thermoplastic is polypropylene.

22. The process for the preparation of the molding material as claimed in claim 1, wherein said grafted, substantially amorphous polyolefin contained in said molding material is crosslinked.

23. The process as claimed in claim 22, wherein crosslinking is carried out by means of water vapor from the surrounding air, by water vapor which is contained in a gas stream, by steam or hot water treatment or by water which is contained in said thermoplastic.

24. The process as claimed in either of claims 22 and 23, wherein crosslinking is carried out in a melt, in the granules or on a shaped article.

25. A shaped article comprising the molding material of claim 1.

26. A heavy-duty carpet backing material comprising

a grafted, substantially amorphous polyolefin of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon, wherein said grafted, substantially amorphous polyolefin has a melt viscosity at 190°

C. in the range from 100 to 50,000 mPas and

from 0.5 to 400 parts by weigh of a reinforcing material based on 100 parts by weight of polyolefin,

with the exception of those carpet-backing materials in which less than 28 parts by weight of barite is used.

27. A hotmelt adhesive comprising

a grafted, substantially amorphous polyolefin of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon, wherein said grafted, substantially amorphous polyolefin has a melt viscosity at 190°

C. in the range from 100 to 50,000 mPas and

from 0.5 to 400 parts by weight of a reinforcing material based on 100 parts by weight of polyolefin,

with the exception of those carpet-backing materials in which less than 28 parts by weight of barite is used.

28. A masterbatch for the preparation of reinforced thermoplastic comprising

a grafted, substantially amorphous polyolefin of a substantially amorphous polyolefin which has been subjected to free radical grafting with a silane which has at least one olefinic double bond and one to three alkoxy groups bonded directly to the silicon, wherein said grafted, substantially amorphous polyolefin has a melt viscosity at 190°

C. in the range from 100 to 50,000 mPas and

from 0.5 to 400 parts by weight of a reinforcing material based on 100 parts by weight of polyolefin,

with the exception of those carpet-backing materials in which less than 28 parts by weight of barite is used.