Composite part

Patent metadata

Field	Value
Publication number	US-10239293-B2
Application number	US-201515319595-A
Country	US
Kind code	B2
Filing date	Jun 19, 2015
Priority date	Jun 20, 2014
Publication date	Mar 26, 2019
Grant date	Mar 26, 2019

Abstract

The invention relates to a composite part, hereinafter also referred to as composite, which is produced by means of 2-component processing methods, preferably 2-component injection molding (2K injection molding), from at least one part composed of at least one polyamide molding composition additized with polybutadiene copolymer which is livid at room temperature and at least one part composed of at least one elastomer obtainable from rubber that is to be vulcanized or crosslinked with elemental sulphur, or is composed of these components after processing thereof.

First claim

What is claimed is:

1. A composite part comprising at least one part comprising at least one polyamide moulding composition, directly adhered with at least one part comprising at least one elastomer, wherein:
the polyamide moulding composition comprises a mixture of polyamide and at least one polybutadiene copolymer which is liquid at room temperature (RT); and
the elastomer comprises a rubber which is crosslinkable or vulcanizable with elemental sulphur.

2. The composite part as claimed in claim 1 , wherein the polyamide moulding composition comprises at least 30% by weight of a mixture of:
a) 60 to 99.9 parts by weight of polyamide; and
b) 0.1 to 40 parts by weight of at least one polybutadiene copolymer which is liquid at RT,
where the sum total of the parts by weight of a) and b) is 100.

3. The composite part as claimed in claim 1 , wherein the polybutadiene copolymer has a dynamic viscosity of 100 to 1,000,000 mPas, measured by the cone-plate method to DIN 53019 at a sheer rate of 50 ifs, at standard pressure, and at a temperature of 25° C.

4. The composite part as claimed in claim 3 , wherein the polybutadiene copolymer comprises a copolymer of 1,3 butadiene with a further monomer having at least one C═C bond.

5. The composite part as claimed in claim 1 , wherein the part comprising at least one polyamide moulding composition does not contain any coagent for peroxidic crosslinking of rubbers.

6. The composite part as claimed in claim 1 , wherein the rubber contains C═C double bonds.

7. The composite part as claimed in claim 6 , wherein the rubber containing C═C double bonds comprises a rubber based on dienes.

8. The composite part as claimed in claim 7 , wherein the rubber is selected from the group consisting of natural rubber (NR), ethylene-propylene-diene rubbers (EPDMs), styrene/diolefin rubbers, polybutadiene rubber (BR), polyisoprene (IR), butyl rubber (IIR), halobutyl rubber (XIIR), nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), carboxylated butadiene/acrylonitrile rubber (XNBR), and polychloroprene (CR), and mixtures of two or more of the aforementioned rubbers.

9. The composite part as claimed in claim 8 , wherein the rubber is at least one rubber selected from the group consisting of natural rubber (NR), ethylene-propylene-diene rubber (EPDM), styrene/butadiene rubber (SBR), carboxylated butadiene/acrylonitrile rubber (XNBR), polychloroprene (CR), nitrile rubber (NBR), and polybutadiene (BR).

10. The composite part as claimed in claim 1 , wherein the polyamide is PA6, PA66, PA610, PA88, PA612, PA810, PA108, PA9, PA613, PA614, PA612, PA1010, PA10, PA814, PA148, PA1012, PA11, PA1014, PA1212, PA12 or mixtures of the listed polyamides, or copolyamides containing caprolactam as comonomer.

11. The composite part as claimed in claim 10 , wherein the copolyamides containing caprolactam as comonomer are random semicrystalline aliphatic copolyamides.

12. The composite part as claimed in claim 11 , wherein the polyamide mixtures are polyimide combinations from the group consisting of PA6/PA66, PA12/PA1012, PA12/1212, PA612/PA12, PA613/PA12, PA1014/PA12 or PA610/PA12, and corresponding combinations with PA11.

13. A method of boosting composite adhesion between components of a composite part, the components comprising at least one part comprising a polyamide moulding composition, and at least one part comprising are elastomer obtained from rubber crosslinkable or vulcanizable with elemental sulphur, the method comprising mixing at least one polybutadiene copolymer which is liquid at room temperature (RT) with the polyamide moulding composition.

14. The method as claimed in claim 13 , wherein the composite part is at least a portion of a product that conducts liquid media and/or gaseous media and the product comprises gaskets, membranes, gas pressure accumulators, hoses, housings for motors, pumps and electrically operated tools, rollers, tyres, couplings, stop buffers, conveyor belts, drive belts, multilayer laminates and multilayer films, and also sound- and vibration-deadening components.

15. A method for producing composite parts which are composed of at least one part comprising at least one polyamide moulding composition, and at least one part comprising at least one elastomer comprising a rubber vulcanizable or crosslinkable with elemental sulphur as crosslinking agent, the method comprising:
either, contacting the at least one part comprising the at least one polyamide moulding composition with at least one rubber comprising elemental sulphur to form a composite, and subjecting the composite to vulcanization conditions for the rubber,
or, contacting the at least one part comprising rubber with at least one polyamide moulding composition to form a composite, and subjecting the composite to vulcanization conditions for the rubber,
wherein the polyamide moulding composition comprises a mixture of polyamide with at least one polybutadiene copolymer which is liquid at room temperature (RT).

16. The composite part as claimed in claim 2 , wherein:
the polybutadiene copolymer has a dynamic viscosity of 100 to 1,000,000 mPas, measured by the cone-plate method to DIN 53019 at a sheer rate of 50 1/s, at standard pressure, and at a temperature of 25° C.;
the polybutadiene copolymer is a copolymer of 1,3 butadiene with styrene or acrylonitrile;
the part comprising at least one polyamide moulding composition does not contain any coagent for peroxide crosslinking of rubbers;
the rubber is selected from the group consisting of natural rubber (NR), ethylene-propylene-diene rubbers (EPDMs), styrene/diolefin rubbers, polybutadiene rubber (BR), polyisoprene (IR), butyl rubber (IIR), halobutyl rubber (XIIR), nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), carboxylated butadiene/acrylonitrile rubber (XNBR), polychloroprene (CR), and mixtures of two or more of the aforementioned rubbers; and
the polyamide is PA6, PA66, PA610, PA88, PA612, PA810, PA108, PA9, PA613, PA614, PA812, PA1010, PA10, PA814, PA148, PA1012, PA11, PA1014, PA1212, PA12, or mixtures of the listed polyamides, or copolyamides containing caprolactam as comonomer.

17. The composite part as claimed in claim 16 , wherein:
the rubber is at least one rubber selected from the group consisting of natural rubber (NR), ethylene-propylene-diene rubber (EPDM), styrene/diolefin rubber (SBR), carboxylated butadiene/acrylonitrile rubber (XNBR), polychloroprene (CR), nitrile rubber (NBR), and polybutadiene (BR); and
the polyamide is at least one of amide selected consisting PA6, PA66, PA 6/66, PA6/PA66, PA12/PA1012, PA12/1212, PA612/PA12, and PA613/PA12.

Assignees

• Lanxess Deutschland Gmbh

Inventors

• Dederichs Thomas
• Fruh Thomas
• Bischoff Andreas
• Giese Ulrich
• Thust Torsten

Classifications

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B29C45/00

  Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor (injection blow-moulding B29C49/06) · CPC title

• B32B27/18 Primary

  characterised by the use of special additives · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title