TRANSPARENT PEROXIDE CURABLE BUTYL RUBBER Russian patent published in 2018 - IPC C08F210/12 C08C19/32 C08J3/24 C08L23/32 C08L23/36 C08L23/22 C08F8/40 C08F8/30 B29C35/02 

FIELD: chemistry.

SUBSTANCE: present invention relates to a process for the production of an optically transparent peroxide cured article, made from a peroxide curable butyl rubber ionomer, wherein at least a portion of the optically transparent peroxide cured article has a transmittance greater than or equal to 75% of visible light with a wavelength selected from 350-750 nm, at a thickness of 0.51 mm or less. Method includes the following steps: (a) providing a halogenated butyl rubber polymer, comprising repeating units, obtained from at least one isoolefin monomer, and repeating units, obtained from one or more polyolefin monomers, the polymer comprises at least an allyl halide moiety; (b) mixing a nitrogen- or phosphorus-based nucleophile comprising a pendant vinyl group with a halogenated butyl rubber polymer at a temperature in the range of 25°C to 100°C; (c) reacting the allyl halide moiety with the nucleophile to form a peroxide curable butyl rubber ionomer; (d) mixing the peroxide curing agent with the peroxide curable butyl rubber ionomer; (e) forming a peroxide curable butyl rubber ionomer, mixed with the curing agent, into an article between two heated surfaces characterised by a root-mean-square surface roughness of 0.1 to 10 nm; (f) curing the article under suitable conditions for the peroxide curing agent and (g) releasing the cured article from the space between the heated surfaces. Also disclosed is a cured article, obtained using said method.

EFFECT: technical result is obtaining a peroxide cured article characterised by the required balance of optical transparency, low oxygen penetration rate, physical strength, durability and low surface adhesion.

34 cl, 29 dwg, 18 tbl, 9 ex