Bonding highly-fluorinated plastics to elastomers using silane-based primers

Patent metadata

Field	Value
Publication number	US-2024100757-A1
Application number	US-202017754832-A
Country	US
Kind code	A1
Filing date	Nov 2, 2020
Priority date	Nov 7, 2019
Publication date	Mar 28, 2024
Grant date	—

Abstract

Methods of bonding highly-fluorinated thermoplastics to elastomers are described. The methods include apply primers comprising at least one aromatic silane and at least one amino-silane to an uncured elastomer and irradiating the primer with actinic radiation before or after applying the highly-fluorinated thermoplastics. The elastomer may then be cured to provide articles having good adhesion between the highly-fluorinated thermoplastic and the cured elastomer.

First claim

1 . A method of forming a multilayer article comprising:
(a) applying a primer comprising (i) an aromatic silane and (ii) an amino-silane onto a composition comprising an uncured elastomer; (b) applying a highly-fluorinated thermoplastic onto the primer; (c) irradiating the primer with actinic radiation; and (d) forming a bond between the highly-fluorinated thermoplastic and the composition.

2 . The method of claim 1 , further comprising, after irradiating the primer with actinic radiation, (e) curing the uncured elastomer to form a cured elastomer.

3 . The method of claim 2 , wherein curing the uncured elastomer comprises thermally curing the uncured elastomer.

4 . The method according to claim 1 , wherein the primer is irradiated after the highly-fluorinated thermoplastic is applied onto the primer.

5 . The method according to claim 1 , wherein the primer is irradiated before the highly-fluorinated thermoplastic is applied onto the primer.

6 . The method according to claim 1 , wherein applying the highly-fluorinated thermoplastic onto the primer comprises extruding the highly-fluorinated thermoplastic.

7 . The method according to claim 1 , further comprising extruding the composition comprising the uncured elastomer prior to applying the primer.

8 . The method according to claim 1 , wherein the highly-fluorinated thermoplastic is a fully-fluorinated thermoplastic.

9 . The method of claim 8 , wherein the perfluoroplastic comprises at least one of a fluorinated ethylene propylene (FEP) and a perfluoroalkoxy alkane (PFA).

10 . The method according to claim 1 , wherein the highly-fluorinated thermoplastic comprises a copolymer comprising tetrafluoroethylene, hexafluoropropylene, and vinylidene fluoride.

11 . The method according to claim 1 , wherein the elastomer comprises a fluoroelastomer.

12 . The method according to claim 1 , wherein the elastomer comprises nitrile butadiene rubber.

13 . The method according to claim 1 , wherein the aromatic silane is an aromatic secondary amino-silane or an aromatic tertiary amino-silane.

14 . The method of claim 13 , wherein the aromatic silane comprises an N-phenylaminoalkyltrialkoxysilane.

15 . The method according to claim 1 , wherein the amino-silane is an (aminoalkyl) trialkoxy silane.

16 . A multilayer article made by the method according to claim 2 .

17 . The multilayer article of claim 16 , wherein an adhesive force between the highly-fluorinated thermoplastic and the cured elastomer, as measured according to the Interlayer Adhesion Test, is at least 5 N/cm.

18 . The multilayer article of claim 16 , wherein the adhesive force is at least 15 N/cm.

19 . The multilayer article of claim 16 , wherein the multilayer article is a hose comprising a tube comprising the cured elastomer surrounded by and bonded to the highly-fluorinated thermoplastic.

20 . The multilayer article of claim 16 , wherein the article is a hose comprising a tube comprising the highly-fluorinated thermoplastic surrounded by and bonded to the cured elastomer.

Assignees

• 3M Innovative Properties Company

Inventors

• Nguyen Tho Q
• Hoff Craig R
• Jing Naiyong

Classifications

• B29C48/022 Primary

  characterised by the choice of material · CPC title

• B29C35/08

  by wave energy or particle radiation {(B29C64/00, B29C71/04 take precedence)} · CPC title

• B29C48/09

  Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels · CPC title

• B29C48/21

  the layers being joined at their surfaces · CPC title

• B29D23/00

  Producing tubular articles (B29D24/00 takes precedence) · CPC title