SILICON-CONTAINING HALOGENATED ELASTOMERS

• US 20190330444A1
• Filed: 12/22/2017
• Published: 10/31/2019
• Est. Priority Date: 12/28/2016
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Nguyen, Tho Q., Fukushi, Tatsuo, Sohlo, Allen M., Swierczek, Mary J., Wellner, Steven J.
• Granted Patent: US 11,326,040 B2
• Time in Patent Office: Days
• CPC Class Codes: C08K 2003/2206 of calcium, strontium or barium
• CPC Class Codes: C08K 2003/222 Magnesia, i.e. magnesium oxide
• CPC Class Codes: C08K 2003/2224 Magnesium hydroxide
• CPC Class Codes: C08K 2201/019 the composition being defined by the absence of a certain additive
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08K 3/36 Silica
• CPC Class Codes: C08K 5/0025 Crosslinking or vulcanising agents; including accelerators
• CPC Class Codes: C08L 27/16 Homopolymers or copolymers or vinylidene fluoride

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.

Claims

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 and less than 10 phr of an acid acceptor;

(c) at least 0.01 % and less than 10% by wt 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 7 phr of an acid acceptor.

4. The composition of claim 1, wherein the acid acceptor comprises at least one of MgO, Ca(OH)₂, and hydrotalcite.

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

6. 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) CX₁X₂═

CX₃-L-M wherein X₁, X₂, and X₃ are independently selected from H, Cl, and F and at least one of X₁, X₂, and X₃ is H and at least one is F or Cl; and

(iv) combinations thereof.

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

8. The composition of claim 1:

at least 0.5 phr to at most 4 phr of the acid acceptor, wherein the acid acceptor is Ca(OH)₂, and at least 0.05 phr to at most 5 phr of the silicon-containing compound.

9. The composition of claim 1 comprising:

at least 0.5 phr to at most 7 phr of or the acid acceptor, wherein the acid acceptor is MgO, and at least 0.05 phr to at most 5 phr of the silicon-containing compound.

10. The composition of claim 1 comprising:

at least 0.5 phr to at most 5 phr of the acid acceptor, wherein the acid acceptor is hydrotalcite, and at least 0.05 phr to at most 5 phr of the silicon-containing compound.

11. 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.

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

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

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

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

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

12. An article comprising

a halogenated elastomer having a superficial layer consisting of silicon, wherein the halogenated elastomer comprises at least 0.01 % and less than 10% by wt of silicon-containing inorganic compound in the bulk;

and there is a concentration gradient of silicon doixide, which decreases from the superficial layer toward the bulk.

17. The article of claim 12, wherein the halogenated elastomer consists of an amorphous halogenated polymer.

13. (canceled)

14. (canceled)

15. (canceled)

16. 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 a halogenated amorphous polymer is partially halogenated;

(b) at most 4 phr of an acid acceptor, wherein the acid acceptor is selected from an oxide or hydroxide of a divalent metal; and

(c) at least 0.05 and at most 5 phr of a silicon-containing compound, with a bisphenol cure system.