摘要:
A process for producing a branched poly(isobutylene-co-paramethylstyrene) polymer involves polymerizing isobutylene with p-methylstyrene in presence of a branching agent, the branching agent being a polyfarnesene having 5 or more farnesene units. The resulting branched polymer has improved green strength and creep compliance.
摘要:
A free-radically polymerizable copolymer comprising divalent monomeric units: a); b); and optionally c). Each R1 independently represents an alkyl group having from 1 to 8 carbon atoms. R2 represents H or a methyl group. Z represents an alkylene group having 2 to 12 carbon atoms. X- represents a non-interfering anion. Free-radically polymerizable compositions containing the same are also disclosed as well as the corresponding polymerized compositions.
摘要:
A crosslinking material, the crosslinking material comprising the reaction product of a reaction mixture comprising: (i) a cyclic unsaturated acid anhydride and/or diacid derivative thereof; (ii) an ethylenically unsaturated monomer; and (iii) an alcohol, amine and/or thiol, wherein the cyclic unsaturated acid anhydride and/or diacid derivative thereof is partially- esterified by reaction with the alcohol, amine and/or thiol; and wherein the crosslinking material has an acid number of at least 100 mg KOH/g.
摘要:
The present invention relates to processes and apparatus useful for (fast) ionic polymerisation of liquid monomer(s) containing reaction mixture for the production of the corresponding polymer(s).
摘要:
This invention relates to a method of preparing a brominated elastomer having a stabilized Mooney viscosity. The method includes polymerizing isomonoolefins and at least one polymerizable unit to obtain an elastomer/polymer; brominating the elastomer/polymer to form a brominated elastomer effluent; neutralizing the brominated elastomer effluent to form a neutralized effluent; volatizing off the hydrocarbon solvent; and recovering a brominated elastomer. In at least one point of the process, preferably prior to any significant temperature change in the brominated polymer, a Mooney stabilizer is added into the system. Portions of the Mooney stabilizer may be added at multiple points into the process.
摘要:
Nucleophilic substitution reactions of halogenated polymers and cross-linking nucleophiles are used to produce thermoset ionomers. These cured ionomers are useful in adhesive, antimicrobial applications, as well as in polymer composites and polymer blends. Furthermore, these thermoset ionomers' ion pairs can bear reactive functionality, which provides access to further reactions that were unavailable using previous technology.
摘要:
The invention relates to a new catalyst system that improves the heat transfer capability of a butyl reactor slurry process system in the production of isobutylene-based polymers in continuous slurry polymerization processes. The process is carried out in an anhydrous polymerization system containing a mixture of the monomers in a polar diluent along with a Lewis acid and a CS or greater initiator having a tertiary halide.
摘要:
A composition that includes a copolymer of isobutylene and diisobutylene-type monomers and various other vinyl monomers; the copolymer comprising a group that is capable of undergoing a polymerization reaction when exposed to actinic radiation or ionizing radiation. The composition may be used to coat a substrate by providing a substrate; applying a layer of a radiation-curable composition that includes the copolymer described above over at least a portion of a surface of the substrate; and curing the radiation-curable composition by exposing the layer to actinic radiation in an amount sufficient to effect curing of the radiation-curable composition.
摘要:
A composition that includes a fluorine-containing copolymer containing at least 30 mol % of residues having the following alternating structural unit: -[DM-AM]-where DM represents a residue from a donor monomer having the following structure (I): R 1 is linear or branched C 1 to C 4 alkyl; R 2 is selected from methyl, linear, cyclic or branched C 1 to C 20 alkyl, alkenyl, aryl, alkaryl and aralkyl; and AM represents an acceptor monomer. The copolymer contains at least 5 wt.% fluorine. The composition may include co-reactive functional groups and may be a thermosetting composition, which can be used to coat a substrate. The thermosetting composition may be part of a multi-component composite coating composition that includes a base coat deposited from a pigmented film-forming composition and a substantially pigment free top coat applied over at least a portion of the base coat.