Highly pure halogenated rubbers

Patent metadata

Field	Value
Publication number	US-2016333148-A1
Application number	US-201415107511-A
Country	US
Kind code	A1
Filing date	Dec 22, 2014
Priority date	Dec 23, 2013
Publication date	Nov 17, 2016
Grant date	—

Abstract

The invention relates to a method to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by LCST compounds as well as highly pure halogenated rubbers. The invention further relates to halogenated elastomer products comprising the same or derived therefrom.

First claim

1 . A process for the preparation of an aqueous slurry comprising a plurality of halogenated elastomer particles suspended therein, the process comprising at least the steps of:
A) contacting an organic medium comprising
i) at least one halogenated elastomer and
ii) an organic diluent
with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100° C. and
B) removing at least partially the organic diluent to obtain the aqueous slurry comprising the halogenated elastomer particles.

2 .- 30 . (canceled)

31 . The process according to claim 1 , wherein the aqueous phase comprises of from 1 to 2,000 ppm of antioxidants.

32 .- 34 . (canceled)

35 . The process according to claim 1 , wherein the organic medium is obtained by a process comprising at least the step of:
i) halogenating an elastomer using a halogenating agent in a organic diluent to obtain an organic medium comprising the halogenated elastomer and the organic diluent and optionally ii) washing the organic medium comprising the halogenated elastomer with a basic aqueous phase and separating the resulting aqueous phase from the organic medium.

36 . The process according to claim 1 , wherein the halogenated elastomer is obtained by halogenating an elastomer comprising repeating units derived from at least one isoolefin and repeating units of at least one multiolefin.

37 . The process according to claim 1 , wherein the at least one isoolefin is selected from the group consisting of isoolefin monomers having from 4 to 16 carbon atoms, preferably 4 to 7 carbon atoms, more preferably Isobutene, 2-methyl-1-butene, 3-methyl-1-butene, 2-methyl-2-butene.

38 . The process according to claim 1 , wherein the isoolefin is isobutene.

39 . The process according to claim 37 , wherein the at least one multiolefin is selected from the group consisting of isoprene, butadiene, 2-methylbutadiene, 2,4-dimethylbutadiene, piperyline, 3-methyl-1,3-pentadiene, 2,4-hexadiene, 2-neopentylbutadiene, 2-methyl-1,5-hexadiene, 2,5-dimethyl-2,4-hexadiene, 2-methyl-1,4-pentadiene, 4-butyl-1,3-pentadiene, 2,3-dimethyl-1,3-pentadiene, 2,3-dibutyl-1,3-pentadiene, 2-ethyl-1,3-pentadiene, 2-ethyl-1,3-butadiene, 2-methyl-1,6-heptadiene, cyclopentadiene, methylcyclopentadiene, cyclohexadiene and 1-vinyl-cyclohexadiene.

40 . The process according to claim 37 , wherein the multiolefin is isoprene.

41 .- 51 . (canceled)

52 . The process according to claim 1 , wherein the amount of LCST compound(s) present in the aquous medium employed in step A) is of from 1 to 20,000 ppm with respect to the amount of halogenated elastomer present in the organic medium.

53 .- 54 . (canceled)

55 . The process according to claim 1 , comprising a further step C) wherein the halogenated elastomer particles contained in the aqueous slurry obtained according to step B) are separated to obtain isolated halogenated elastomer particles.

56 . The process according to claim 1 , comprising further step C) wherein the halogenated elastomer particles contained in the aqueous slurry obtained according to step B) are separated to obtain isolated halogenated elastomer particles and further step e) wherein the (isolated) halogenated elastomer particles are dried.

57 . The process according to claim 1 , comprising as a further step D) shaping of the halogenated elastomer particles to obtain halogenated elastomer product.

58 . Aqueous slurry obtainable according to a process according to claim 1 .

59 .- 60 . (canceled)

61 . Halogenated elastomer products or halogenated elastomer particles comprising
I) 96.0 wt.-% or more of a halogenated elastomer II) 0 to 3.0 wt.-% of salts of mono- or multivalent metal ions, preferably stearates and palmitates of multivalent metal ions and III) 1 ppm to 5,000 ppm of at least one LCST compound.

62 . Halogenated elastomer products or halogenated elastomer particles comprising
I) 100 parts by weight of a halogenated elastomer II) 0.0001 to 0.5 parts by weight of a least one LCST compound and III) no or 0.0001 to 3.0 parts by weight of salts of mono- or multivalent metal ions and IV) no or 0.005 to 0.3 parts by weight (phr) of antioxidants V) 0.005 to 1.5 parts by weight of volatiles having a boiling point at standard pressure of 200° C. or less.

63 . (canceled)

64 . Halogenated elastomer products or halogenated elastomer particles according to claim 62 further comprising
VI) from 0.05 to 2.5 parts by weight of stabilize.

65 . (canceled)

66 . Halogenated elastomer particles and halogenated elastomer products comprising 97.5 wt.-% or more of a halogenated elastomer and having an ash content measured according to ASTM D5667 of 0.25 wt.-% or less.

67 . Halogenated elastomer products or halogenated elastomer particles according to claim 66 further comprising 1 ppm to 5,000 ppm of a least one LCST compound.

68 .- 87 . (canceled)

Assignees

• Arlanxeo Singapore Pte Ltd

Inventors

• Arsenault Gilles Joseph
• Thompson David
• Lund Clinton

Classifications

• C08J3/21

  the polymer being premixed with a liquid phase · CPC title

• C08J3/24

  Crosslinking, e.g. vulcanising, of macromolecules (mechanical aspects B29C35/00; crosslinking agents C08K) · CPC title

• C08L23/283

  Iso-olefin halogenated homopolymers or copolymers · CPC title

• C08K5/098

  Metal salts of carboxylic acids · CPC title

• B29B9/06

  in the form of filamentary material, e.g. combined with extrusion · CPC title