Chlorinated copolymers and polymer products including chlorinated copolymer
AssigneeArlanxeo Singapore Pte. Ltd.
InventorsGregory J. E. Davidson, Kuruppu Jayatissa
Life of this patent
Estimating the term…
Abstract
The invention relates to an energy efficient, fast and environmentally favourable process for the preparation of chlorinated butyl rubbers, that uses hypochloric acid (HOCl) and/or dichlorine monoxide (Cl2O) as halogenating agent. The chlorinated butyl rubbers prepared according to the aforementioned process exhibit an advantageous microstructure and a desirable content and ratio of chlorinated and non-chlorinated oligomers and are therefore also encompassed by the invention. The teachings herein also relate to chlorinated copolymers and polymer products that include a chlorinated copolymer.
Claims20
A chlorinated copolymer comprising at least
- i) structural units derived from at least one isoolefin monomer and
- ii) structural units derived from at least one multiolefin monomer;
- wherein the
- the chlorine content of the chlorinated copolymer is from 0.1 to 4 wt.-%,
- the structural units derived from the at least one multiolefin monomer are at least partially chlorinated to form exo-methylene and endo-halomethyl and cis-endo and trans-endo microstructure units such that the microstructure Index X being the ratio of mol-% (exo-methylene+endo-halomethyl)/mol-% (cis-endo and trans-endo)
- as measured by 1H-NMR is from 1.50 to 3.30.
A chlorinated copolymer comprising at least
- i) structural units derived from at least one isoolefin monomer and
- ii) structural units derived from at least one multiolefin including isoprene;
- wherein the copolymer comprises 1-(1-chloromethylethenyl)-2,2,4,4-tetramethylcyclohexane (C1-C13) and 1,1,5,5-tetramethyl-2-(1-chloromethylethenyl)-3-(2,2,4-trimethylpentyl)-cyclohexane (C1-C21) in an amount of together 1000 ppm or less and/or in a ratio (C1-C13)/(C1-C21) of 0.60 or more.
Dependencies are inferred from the claim text.