摘要:
Novel functionalized peroxides which may be used as crosslinking, grafting and curing agents, initiators for polymerization reactions and as monomers for condensation polymerizations to form peroxy-containing polymers, which in turn can be used to prepare block and graft copolymers, have the following Formula I: ##STR1## R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, X, Y.sup.1, Y.sup.2, Y.sup.3, Z.sup.1, Z.sup.2, x, y and z are as defined in the Summary of the Invention. The compounds of Formula I may be prepared by reacting hydroxy-containing tertiary hydroperoxides with diacid halides, phosgene, dichloroformates, diisocyanates, anhydrides and lactones to form the functionalized peroxides. These reaction products may be further reacted, if desired, with dialcohols, diamines, aminoalcohols, epoxides, epoxy alcohols, epoxy amines, diacid halides, dichloroformates and diisocyanates to form additional functionalized peroxides.
摘要:
An ester type polymeric peroxide; has a peroxide group of the formula (I): ##STR1## a group of the formula (I') ##STR2## a group of the formula (II) ##STR3## wherein X stands for one member selected from the group consisting of --CH.sub.2 --CH.sub.2 --, --C.tbd.C-- and ##STR4## continuously bound such that I and I' occur randomly in alternation with II, having a (I):(I') molar ratio in the range of from 9:1 to 1:9 and the [(I)+(I')]:(II) molar ratio in the range of from 6:4 to 4:6, and having an average molecular weight in the range of from 1,000 to 20,000, a polymerization initiator for vinyl type monomer comprising said ester type polymeric peroxide and method for the production of a block copolymer of vinyl type monomer by said polymerization initiator.
摘要:
A novel polymeric peroxide used as a free radical polymerization initiator for vinyl monomers is a compound alternately bonding the two particular structural units in random form and having two different thermal decomposition rates.
摘要:
New dialkyl esters of monoperoxyoxalic acid which have a tertiary alkyl group in the perester part of the molecule while the other alkyl group is a long-chain, primary alkyl group. The compounds give rise to radicals at heating and are useful as initiators for the polymerization of ethylenically unsaturated monomers, particularly for the polymerization of vinyl chloride.
摘要:
A light curable dental composition is provided. The composition comprises an ethylenic unsaturated compound and a light polymerization initiator. The light polymerization initiator is selected from a combination of an organic peroxide and a pyrylium salt compound of: ##STR1## Wherein R.sub.1, R.sub.2, and R.sub.3 each represents a hydrogen atom, an alkyl group and the like, X stands for an oxygen or sulfur atom and Y for an anionic functional group; a polyperoxy ester containing a benzophenone group; and a combination the polyperoxy ester and an .alpha.-diketone.
摘要:
A process for generating random dialkyl or alkyl aryl peroxide functionality on elastomers is disclosed. Generally, the process involves dissolving an elastomer in a solvent followed by treating the resulting solution with an oxidizing agent in the presence of a catalyst. In a preferred embodiment, the oxidizing agent is a an alkyl or aryl hydroperoxide and the catalyst is a Group VIIa, VIII, Ib or IIb metal.
摘要:
A process for preparing .alpha.-methylstyrene/acrylonitrile copolymers by suspension or bulk polymerization of .alpha.-methylstyrene and acrylonitrile with or without other vinyl compounds such as styrene, methyl methacrylate, vinyl toluene and t-butylstyrene in the presence of a difunctional organic peroxide, preferably a difunctional organic peroxide having a 10 hour half-life temperature of 60.degree. to 110.degree. C., at a polymerization temperature of 80.degree. to 120.degree. C. The process produces the copolymers having excellent transparency, heat resistance and strength in high conversions in a short time.
摘要:
A process for copolymerizing unsaturated polyester resins is disclosed wherein said resin is copolymerized in the presence of a perketal and an acid or acid-releasing compound.
摘要:
An unsaturated polyester resin composition which is obtained by incorporating a thermoplastic random-copolymer having peroxycarbonate groups in the molecule thereof into an unsaturated polyester resin, which composition is excellent in low shrinkage characteristics and it is not weakened in mechanical strength.
摘要:
A copolymer having peroxy bonds in the molecule thereof which is obtained by copolymerizing an diacyl type polymeric peroxide having ester bonds therein with one or more monomers having double bonds therein, may have a broad range of average molecular weight and a lot of peroxy bonds therein, and it may be used as an useful polymerization initiator in producing a block copolymer.