摘要:
Block copolymers of particular structure comprising blocks of polymerized alkenyl aromatic compound and polymerized conjugated alkadiene, as well as selectively hydrogenated derivatives thereof, are functionalized by the presence of additional polar blocks of polymerized alkyl methacrylate.
摘要:
Block copolymers useful in formulations of adhesives, coatings, and lubricating oils have a particular structure comprising blocks of a polymerized alkenyl aromatic compound such as styrene, an internal block of a polymerized conjugated alkadiene such as butadiene, as well as selectively hydrogenated derivatives thereof, and a polar block of a polymerized alkyl methacrylate such as t-butyl methacrylate.
摘要:
Novel, selectively hyrogenated block compolymers, which compolymers comprise at least one block of polymerized alkyl methacrylate and one block of polymerized conjugated alkadiene, provide improved dispersant properties and viscosity index improvement to hydrocarbon lubricating oils.
摘要:
A process to polymerize alkoxystyrenes utilizing a zeolite as the initiator is provided. Polymers of p-methoxystyrene having number average molecular weights in excess of 1.times.10.sup.6 are prepared by room temperature polymerization. The invention also provides a high molecular weight polymer of alkoxystyrenes which has a broad molecular weight distribution.
摘要:
This invention relates to anionically polymerized block copolymers comprised of at least one block polyethylene and at least one block of a polymerized cyclic siloxane monomer, e.g., polydimethylsiloxane. Block copolymers with multiple "arms" may be formed by coupling these living diblocks with polyfunctional coupling agents. One copolymer for use in wax release coatings has an overall weight average molecular weight of 1500 to 100,000, a polyethylene block weight average molecular weight of less than 4100, and a polyethylene content of less than 55 percent by weight. Another copolymer for use in extruded release coating films prepared by blending the copolymer with a film grade polymer has an overall molecular weight of less than 20,000 and a polyethylene block molecular weight of less than 3700.
摘要:
A graft block copolymer is comprised of a completely saturated olefinic backbone with pendant anionic polymer side chains. The polymer is produced by copolymerizing an .alpha.-olefin with a monomer which contains a functional group which can be metallated so an anionic monomer can be polymerized therefrom, metallating the copolymer by reaction with metal alkyl or aryl compound and a metallation activator, and growing anionic polymer side chains from the copolymer backbone by reacting an anionically polymerized monomer with the metallated copolymer.
摘要:
Polymers comprising blocks of a hydrogenated conjugated diene (B), a vinylarene (A), and an alkyl methacrylate (M), are readily prepared as a mixture of molecules having the structures B-A-M and B-A-M-A-B wherein both structures are effective as viscosity index improvers for oil compositions. Reaction of the polymers with a primary or secondary amine results in a dispersant viscosity index improver.
摘要:
Star polymers having first polymeric arms comprising a hydrogenated conjugated diene and smaller second polymeric arms of a methacrylate resist coupling of methacrylate blocks attached to different cores and have improved performance as viscosity index improvers. The polymerized methacrylate units are converted to amide or imide groups by reaction with a primary or secondary amine to give the viscosity index improver dispersant properties.
摘要:
The present invention provides grafted polymers that have pendent functional groups on the core of the polymer wherein the core is a polymerized alkylmethacrylate having a number average molecular weight from 500 to 1,000,000. The arms of the grafted polymer comprise anionically polymerized segments that have number average molecular weights from 1,000 to 300,000.
摘要:
Hydrogenated butadiene polymers having terminal silyl groups are prepared from a (4-vinylphenylene)dimethyl(t-butyl)silyl ether which is added to the polymer chain as a silyl ether initiator or an endcapping agent, or both. The silyl groups are then converted to phenolic groups. The polymers are useful in making coatings, sealants, binders, and block copolymers with polyesters, polyamides, and polycarbonates.