Plastic-based multilayer structure and tube having a multilayer structure

• US 6,964,800 B2
• Filed: 05/28/2002
• Issued: 11/15/2005
• Est. Priority Date: 12/20/1996
• Status: Expired due to Fees

• Current Assignee: Nyltec Italia
• Original Assignee: Nyltec Italia
• Inventors: Peduto, Nicolangelo
• Primary Examiner(s): Ahmad, Nasser
• Assistant Examiner(s): HON, SOW FUN
• Application Number:
  US10/156,594
• Publication Number:
  US 20030008087A1
• Time in Patent Office: 1,267 Days
• Field of Search: 428/35.7, 428/36.6, 428/36.91, 428/421, 428/424.4, 428/424.6, 428/475.8, 138140-141, 138/DIG.8, 138/137
• US Class Current: 428/36.91
• CPC Class Codes: B32B 1/00 Layered products having a non-planar shape
• CPC Class Codes: B32B 1/08 Tubular products
• CPC Class Codes: B32B 2307/7242 Non-permeable
• CPC Class Codes: B32B 2307/7265 Non-permeable
• CPC Class Codes: B32B 2307/734 Dimensional stability
• CPC Class Codes: B32B 2597/00 Tubular articles, e.g. hoses, pipes
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/22 using plasticisers
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/304 comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
• CPC Class Codes: B32B 27/34 comprising polyamides
• CPC Class Codes: B60K 15/01 Arrangement of fuel conduits chassis frame forming fluid conduit means B62D21/17
• CPC Class Codes: F02M 37/0017 related to fuel pipes or their connections, e.g. joints or sealings F02M55/004 takes precedence
• CPC Class Codes: F16L 11/04 made of rubber or flexible plastics
• CPC Class Codes: F16L 2011/047 with a diffusion barrier layer
• CPC Class Codes: F16L 9/12 of plastics with or without reinforcement F16L9/16 - F16L9/22 take precedence
• CPC Class Codes: Y10T 428/1352 Polymer or resin containing [i.e., natural or synthetic]
• CPC Class Codes: Y10T 428/1379 Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
• CPC Class Codes: Y10T 428/1393 Multilayer [continuous layer]
• CPC Class Codes: Y10T 428/3154 Of fluorinated addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31576 : Ester monomer type [polyvinylacetate, etc.]
• CPC Class Codes: Y10T 428/3158 : Halide monomer type [polyvinyl chloride, etc.]
• CPC Class Codes: Y10T 428/31743 : Next to addition polymer from unsaturated monomer[s]

Abstract

The invention concerns a plastic-based multilayer structure, in particular for making tubes or conduits for transporting liquid fluids such as alcohol, liquid fuels derived from petrol, fuels containing oxygen compounds such as, for instance alcohol. More particularly it concerns a multilayer structure comprising an external layer (A) formed from a polyamide based composition with and an internal adjacent layer (B) formed from a polyfluorovinylidene based composition.

Claims

1. A multilayer structure comprising at least one external layer (A) formed from a polyamide composition and at least one adjacent internal layer (B) formed from a polyvinylidene-fluoride composition, wherein the polyamide composition or the polyvinylidene-fluoride composition comprises a polyacrylate compound comprising the repeat units of the following formulae:

wherein;

R, R₁;

which are identical or different, represent alkyl groups comprising from 1 to 12 carbon atoms,

R₂;

is a radical of formula R₄—

F wherein R₄ is an alkyl, aryl, arylalkyl or alkylaryl radical and F represents an epoxy functional group, and, optionally, repeat units of formulae;

wherein;

R₅ represents a polyalkyl(meth)acrylate chain,

R₃ represents an alkyl radical comprising from 1 to 6 carbon atoms, and

n;

is an integer between 1 and 4.

2. A structure according to claim 1, wherein said structure forms the walls of a hollow article.

3. A structure according to claim 2, wherein the hollow article is a tube, a pipe or a tank.

4. A structure according to claim 1, wherein the polyamide is an aliphatic polyamide, an aliphatic copolyamide, or a mix of an aliphatic polyamide and an aliphatic copolyamide.

6. A structure according to claim 1, wherein the polyamide is a blend of a PA 6 and a PA 6/6,36 copolyamide.

8. A structure according to claim 1, wherein the concentration of functional radical F in the polyacrylate compound is between 0.1 meq/g and 1 meq/g of polyacrylate compound.

9. A structure according to claim 1, wherein the polyacrylate compound comprises repeat units of formula (iii) in which R₅ is a polymethyl methacrylate chain.

10. A structure according to claim 1, wherein the polyacrylate compound is present in the polyvinylidene-fluoride composition in a concentration by weight of between 5% and 25% of the polyacrylate compound with respect to the weight of the composition.

11. A structure according to claim 10, wherein the concentration of polyacrylate compound is between 10 and 20%.

12. A structure according to claim 1, further comprising an intermediate layer (C) which comprises a polyvinylidene fluoride or a polyamide.

13. A structure according to claim 1, wherein the polyamide composition forming the layer (A) further comprises a plasticizer.

5. A structure according 1, wherein the polyamide is PA 4,6;

PA 6,6;

PA 6,12;

PA 6,10;

PA 6;

PA 11;

PA 12;

PA 6,36; and

PA 6/6,36.

7. A multilayer structure comprising at least one external layer (A) formed from a polyamide composition and at least one adjacent internal layer (B) formed from a polyvinylidene-fluoride composition, wherein the polyamide composition or the polyvinylidene-fluoride composition comprises a polyacrylate compound comprising the repeat units of the following formulae:

wherein;

R, R₁;

which are identical or different, represent alkyl groups comprising from 1 to 12 carbon atoms,

R₂;

is a glycidyl radical, and, optionally, repeat units of formulae;

wherein

R₅ represents a polyalkyl(meth)acrylate chain,

R₃ represents an alkyl radical comprising from 1 to 6 carbon atoms, and

n;

is an integer between 1 and 4.

14. A multilayer structure comprising at least one external layer (A) formed from a polyamide composition and at least one adjacent internal layer (B) formed from a polyvinylidene-fluoride composition, and an adhesive intermediate layer (C) placed between the layers (A) and (B), said layer (C) being formed from a composition comprising at least one polyacrylate compound comprising repeat units of the following formulae:

wherein;

R, R₁;

represent alkyl groups comprising from 1 to 12 carbon atoms,

R₂;

is a radical of formula R₄—

F wherein R₄ is an alkyl, aryl, arylalkyl or alkylaryl radical and F represents an epoxy functional group, and, optionally, repeat units of formulae;

wherein

R₅ represents a polyalkyl(meth)acrylate chain,

R₃ represents an alkyl radical comprising from 1 to 6 carbon atoms, and

n;

is an integer between 1 and 4.

15. A structure according to claim 14, wherein the intermediate layer (C) has the following composition by weight:

5%-100% of acrylate compound

0%-95% of polyvinylidene fluoride

0%-90% of polyamide,

and when the polyamide is present in the layer C, the concentration by weight of polyvinylidene fluoride is greater than 5%, the sum of these concentrations being equal to 100%.

16. A structure according to claim 14, wherein said structure forms the walls of a hollow article.

17. A structure according to claim 16, wherein the hollow article is a tube, a pipe or a tank.

18. A structure according to claim 14, wherein the polyamide is an aliphatic polyamide, an aliphatic copolyamide, or a mixture of an aliphatic polyamide and an aliphatic copolyamide.

19. A structure according to claim 14, wherein the polyamide is PA 4,6;

PA 6,6;

PA 6,12;

PA 6,10;

PA 6;

PA 11;

PA 12;

PA 6,36; and

PA 6/6,36.

20. A structure according to claim 14, wherein the polyamide is a blend of a PA 6 and a PA 6/6,36 copolyamide.

21. A structure according to claim 14, wherein the concentration of functional radical F in the polyacrylate compound is between 0.1 meq/g and 1 meq/g of polyacrylate compound.

22. A structure according to claim 14, wherein the polyacrylate compound comprises repeat units of formula (iii) in which R₅ is a polymethyl methacrylate chain.

23. A structure according to claim 14, wherein the polyacrylate compound is present in the polyvinylidene-fluoride composition in a concentration by weight of between 5% and 25% of the polyacrylate compound with respect to the weight of the composition.

24. A structure according to claim 23, wherein the concentration of polyacrylate compound is between 10 and 20%.

25. A multilayer structure comprising at least one external layer (A) formed from a polyamide composition and at least one adjacent internal layer (B) formed from a polyvinylidene-fluoride composition, and an adhesive intermediate layer (C) placed between the layers (A) and (B), said layer (C) being formed from a composition comprising at least one polyacrylate compound comprising repeat units of the following formulae:

wherein;

R, R₁;

represent alkyl groups comprising from 1 to 12 carbon atoms,

R₂;

is a glycidyl radical, and, optionally, repeat units of formulae;

wherein

R₅ represents a polyalkyl(meth)acrylate chain,

R₃ represents an alkyl radical comprising from 1 to 6 carbon atoms, and

n;

is an integer between 1 and 4.