Processability butyl rubber and process for production thereof
First Claim
Patent Images
1. A butyl polymer having improved processability, prepared with a reaction mixture comprising:
- (i) a monomer mixture comprising a C4 to C7 monoolefin monomer and a C4 to C14 multiolefin monomer or β
-pinene;
(ii) a multiolefin cross-linking agent; and
(iii) a chain transfer agent.
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Abstract
A butyl polymer having improved processability is described, together with a process for production thereof. The butyl polymer derived from a reaction mixture which contains: (i) a monomer mixture comprising a C4 to C7 monoolefin monomer (preferably isobutylene) and a C4 to C14 multiolefin monomer (preferably isoprene); (ii) a multiolefin cross-linking agent (preferably divinyl benzene); and (iii) a chain transfer agent (preferably diisobutylene (2,2,4-trimethyl-1-pentene)). The subject butyl polymer has an improved balance of cold flow, filler dispersion, extrusion rate and die swell.
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Citations
44 Claims
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1. A butyl polymer having improved processability, prepared with a reaction mixture comprising:
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(i) a monomer mixture comprising a C4 to C7 monoolefin monomer and a C4 to C14 multiolefin monomer or β
-pinene;
(ii) a multiolefin cross-linking agent; and
(iii) a chain transfer agent. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A process for preparing a butyl polymer having improved processability, comprising the step of continuing a reaction mixture comprising:
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(i) a monomer mixture comprising a C4 to C7 monoolefin monomer and a C4 to C14 multiolefin monomer or β
-pinene;
(ii) a multiolefin cross-linking agent;
(iii) a chain transfer agent; and
(iv) a catalyst system. - View Dependent Claims (27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44)
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Specification