摘要:
A polyacrylamide type gel medium for electrophoresis is conveniently and safely prepared prior to use by crosslinking a water-soluble copolymer of an acrylamide monomer and at least one comonomer copolymerizable therewith, which comonomer contains an active methylene group that will enter into a crosslinking reaction that does not involve a free radical vinyl addition mechanism.
摘要:
Preformed, water-soluble, acrylamide based copolymers comprising a minor proportion of a comonomer, which comonomer contains a site for a crosslinking reaction with a selected crosslinking agent by a reaction that does not involve a free-radical vinyl addition mechanism, which copolymers have M.sub.w and M.sub.n values within selected ranges, can be conveniently and safely used to prepare electrophoresis gel media in situ.
摘要:
A polyacrylamide type gel medium for electrophoresis is conveniently and safely prepared prior to use from a kit which comprises (1) a water-soluble copolymer of an acrylamide monomer and at least one comonomer copolymerizable therewith, which comonomer contains functional groups that permit crosslinking of said copolymer by a covalent but non-free radical initiated mechanism; and (2) a selected crosslinking agent in a package that separates it from the copolymer. Optionally, additional materials that may be usefully incorporated in the gel may be included in the kit, for example, a selected electrophoresis buffer and a complexing agent, such as SDS. The kit is used to prepare the gel by forming a solution of the copolymer in deionized water at the desired concentration of copolymer, adding a sufficient amount of any optional ingredients to provide the desired concentrations thereof, adding such concentration of the crosslinking agent as will provide a gelation time of between about 5 minutes and about 15 hours, and pouring the so prepared reaction mixture into a preselected mold or casting device or onto a support so as to form the resulting gel into the desired shape and size.
摘要:
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and, as a charge-control agent, from about 0.1 to about 10 percent by weight based on the weight of the resin particles of 6-tert-butyl-ortho-benzoic sulfimide as represented by the formula: ##STR1##
摘要:
A monocomponent electrostatographic developer is disclosed. The developer contains a negative charging toner wherein the toner particle surface contains particles of cerium dioxide and a mixture of two hydrophobic silicon dioxides having a particle size of 0.005 to 0.03 .mu.m.
摘要:
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and, as a charge-control agent, from about 0.1 to about 10 percent by weight based on the weight of the resin particles, of ortho-benzoic sulfimide as represented by the formula: ##STR1##
摘要:
A cathode comprising a current collector coated with a dispersion of (CF.sub.x).sub.n wherein x is equal to or less than 1.2 and n is an indeterminately large number, a current carrier and a binder characterized in that the current collector is a conductive foil, the binder is sufficiently adhesive to adhere the coated dispersion to the conductive foil and the coated dispersion has a porosity greater than 43 percent. The cathodes are useful in electrochemical cells having light metal anodes.
摘要:
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. and a weight average molecular weight of 20,000 to 100,000 and, as a charge-controlling additive, from about 0.1 to about 10 percent by weight based on the weight of the resin particles, of the calcium salt of ortho-benzoic sulfimide as represented by the formula: ##STR1##
摘要:
This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000, a colorant and, as a charge-controlling additive, the zinc salt of ortho-benzoic sulfimide as represented by the formula: ##STR1##