Process for overmoulding over a plastic insert and automobile part obtained by this process

Patent metadata

Field	Value
Publication number	US-10843391-B2
Application number	US-201515529331-A
Country	US
Kind code	B2
Filing date	Nov 23, 2015
Priority date	Nov 25, 2014
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A process for manufacturing a composite automobile part by overmoulding, over at least one surface of an insert (1) comprising a first plastic material, a layer of a second thermoplastic material, comprises the following successive steps: a) a step of positioning said insert (1) in a mould, and b) a step of moulding said second thermoplastic material over said insert. At least one of said first and second materials comprises an additive, said additive comprising a polymer to which carboxylic anhydride monomers are grafted. Said first and second materials are respectively based on polyamide and based on polypropylene, or vice versa and said second material comprises talc as mineral filler.

First claim

What is claimed is:

1. A process for manufacturing a composite automobile part comprising the following successive steps:
(a) positioning an insert in a mould, said insert comprising a first plastic material; and
(b) overmoulding a layer of a second thermoplastic material over at least one surface of said insert to obtain the composite automobile part,
wherein at least one of said first plastic material and said second thermoplastic material comprises an additive, said additive comprising a polymer to which carboxylic anhydride monomers are grafted;
wherein said first plastic material and said second thermoplastic material are respectively based on polyamide and based on polypropylene, or vice versa; and
wherein said second thermoplastic material is made of a polymer comprising a propylene/ethylene copolymer based on propylene and polyethylene comprising 12% by weight of talc as mineral filler and 10% by weight of an EPR type elastomer material, from 0.2% to 0.5% by weight of SEBS and from 5% to 10% by weight of polypropylene grafted with maleic anhydride monomers.

2. The process according to claim 1 , wherein said moulding step is an injection moulding step.

3. The process according to claim 1 , wherein said additive is maleic anhydride, a derivative of maleic anhydride, or a combination thereof.

4. The process according to claim 1 , wherein said polymer to which carboxylic anhydride monomers are grafted is selected from the group consisting of polypropylene, high or low density polyethylene, copolymers of propylene and ethylene, a thermoplastic elastomer based on styrene-block-copolymers and combinations thereof.

5. The process according to claim 1 , wherein said second thermoplastic material comprises said additive.

6. The process according to claim 1 , wherein said first plastic material or said second thermoplastic material further comprises another additive comprising a thermoplastic polymer to which carboxylic anhydride monomers are grafted.

7. The process according to claim 1 , wherein said first plastic material and said second thermoplastic material are materials of different type.

8. The process according to claim 1 , wherein the second thermoplastic material comprises a propylene/ethylene copolymer, an elastomer, or a combination thereof.

9. The process according to claim 1 , wherein during the positioning step, the insert is not in a molten state, is at ambient temperature, or both is not in a molten state and is at ambient temperature.

10. The process according to claim 3 , wherein said maleic anhydride, the derivative of maleic anhydride or the combination thereof is present in a proportion ranging from 0.1% to 20% by weight compared with the total weight of said first plastic material, said second thermoplastic material, or combination thereof.

11. The process according to claim 10 , wherein said maleic anhydride-, the derivative of maleic anhydride or the combination thereof is present in a proportion ranging from 2% to 20% by weight compared with the total weight of said first plastic material, said second thermoplastic material, or combination thereof.

12. The process according to claim 4 , wherein the polymer is (polystyrene-b-poly(ethylene-butylene)-b-polystyrene.

13. The process according to claim 7 , wherein said first plastic material and said second thermoplastic material are materials not likely to adhere to each other satisfactorily when subjected to typical injection moulding pressure and temperature conditions.

14. The process according to claim 1 , wherein said second thermoplastic material is made of a polymer consisting of a propylene/ethylene copolymer based on propylene and polyethylene comprising 12% by weight of talc and 10% by weight of an EPR type elastomer material, from 0.2% to 0.5% by weight of SEBS and from 5% to 10% by weight of polypropylene grafted with maleic anhydride monomers.

Assignees

• Plastic Omnium Cie

Inventors

• Ginja Stephane
• Chene Anthony
• Viot Frederic
• Bernard Marine
• Dubost Elise

Classifications

• B29C45/14

  incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles {(B29C45/1671 takes precedence)} · CPC title

• B29C45/14311 Primary

  using means for bonding the coating to the articles (B29C45/14795 takes precedence) · CPC title

• B29K2509/00

  Use of inorganic materials not provided for in groups {B29K2503/00 - B29K2507/00,} as filler · CPC title

• B29K2105/0005

  containing compounding ingredients (releasing, lubricating or separating agents B29C33/56, fibers B29K2105/08, B29K2105/12; fillers B29K2105/16, recycled material B29K2105/26) · CPC title

• B32B27/34

  comprising polyamides · CPC title