Silicon-containing halogenated elastomers

Patent metadata

Field	Value
Publication number	US-11326040-B2
Application number	US-201716473031-A
Country	US
Kind code	B2
Filing date	Dec 22, 2017
Priority date	Dec 28, 2016
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

Described herein is curable composition comprising a halogenated amorphous polymer having at least 25% halogen by weight; at least 0.5 phr of an acid acceptor; at least 0.01 phr of silicon-containing compound; and a dehydrohalogenation cure system. Upon curing, a silicon-containing superficial layer forms, which can provide increased durability, non-tackiness, and a matte finish to the cured elastomer.

First claim

What is claimed is:

1. A curable halogenated amorphous polymer composition comprising:
(a) a halogenated amorphous polymer having at least 25% halogen by weight;
(b) at least 0.5 phr to at most 4 phr of Ca(OH) 2 or at least 0.5 phr to at most 5 phr of hydrotalcite;
(c) at least 0.01% and less than 10% by weight of a silicon-containing compound based on the weight of the halogenated amorphous polymer; and
(d) a dehydrohalogenation cure system.

2. The composition of claim 1 , wherein the halogenated amorphous polymer is a fluorinated amorphous polymer or a chlorinated amorphous polymer.

3. The composition of claim 1 , comprising less than 5% by weight of the silicon-containing compound.

4. The composition of claim 1 , wherein the dehydrohalogenation cure system comprises at least one of (i) a bisphenol cure system, (ii) a amine-based cure system, (iii) CX 1 X 2 ═CX 3 -L-M wherein X 1 , X 2 , and X 3 are independently selected from H, Cl, and F and at least one of X 1 , X 2 , and X 3 is H and at least one is F or Cl; and (iv) combinations thereof.

5. The composition of claim 1 , further comprising a peroxide cure system.

6. The composition of claim 1 , wherein the acid acceptor is Ca(OH) 2 , and the composition comprises at least 0.05 phr to at most 5 phr of the silicon-containing compound.

7. The composition of claim 1 , wherein the acid acceptor is hydrotalcite, and the composition comprises at least 0.05 phr to at most 5 phr of the silicon-containing compound.

8. A method of making a halogenated elastomer having a superficial layer comprising silicon, the method comprising:
(a) obtaining the composition of claim 1 ;
(b) heating the composition in an unrestrained fashion at a temperature of at least 160° C. for at least 15 min.

9. An article comprising
a halogenated elastomer having a superficial layer consisting of silicon, wherein the halogenated elastomer comprises (i) at least 0.01% and less than 10% by wt of silicon-containing inorganic compound in the bulk and (ii) at least one of Ca(OH) 2 or hydrotalcite; and there is a concentration gradient of silicon dioxide, which decreases from the superficial layer toward the bulk.

10. A cured article, the cured article obtainable by curing a composition comprising (a) a halogenated amorphous polymer having at least 25% halogen by weight, wherein the halogenated amorphous polymer is partially halogenated; (b) at least 0.5 phr to at most 4 phr of Ca(OH) 2 or at least 0.5 phr to at most 5 phr of hydrotalcite; and (c) at least 0.05 and at most 5 phr of a silicon-containing compound, with a bisphenol cure system.

11. The article of claim 9 , wherein the halogenated elastomer consists of an amorphous halogenated polymer.

12. The composition of claim 1 , wherein the silicon-containing compound is a liquid.

13. The composition of claim 1 , wherein the silicon-containing compound is organic.

14. The composition of claim 1 , wherein the silicon-containing compound is a glass bubble.

15. The composition of claim 1 , wherein the silicon-containing compound is a nanoparticle.

16. The composition of claim 1 , wherein the composition is substantially free of an-amine-based cure system.

17. The composition of claim 1 , comprising at least 0.1% by weight and less than 1% by weight of the silicon-containing compound.

18. The composition of claim 1 , comprising at least 0.5% by weight and less than 7% by weight of the silicon-containing compound.

19. The article of claim 9 , wherein the article is free of polytetrafluoroethylene or a perfluoroalkoxy alkane (PFA) polymer.

Assignees

• 3M Innovative Properties Co

Inventors

• Nguyen Tho Q
• Fukushi Tatsuo
• Sohlo Allen M
• Swierczek Mary J
• Wellner Steven J

Classifications

• C08K5/0025

  Crosslinking or vulcanising agents; including accelerators · CPC title

• C08K3/22 Primary

  of metals · CPC title

• C08L27/06

  Homopolymers or copolymers of vinyl chloride · CPC title

• C08L27/16

  Homopolymers or copolymers or vinylidene fluoride · CPC title

• C08K3/34 Primary

  Silicon-containing compounds · CPC title