摘要:
Organic peroxide polymerization co-initiator compositions and their use in the initiation of the polymerization of certain monomers and comonomers such as vinyl chloride, ethylene and methyl methacrylate. The co-initiator composition contains an alpha halo substituted diacyl peroxide and a coperoxide selected from t-alkyl peresters of t-hydroperoxides, peroxydicarbonates, acyl peroxycarbonic esters, and aliphatic diacyl peroxides. Typical is acetyl 2-chlorooctanoyl peroxide with t-butyl peroxy neodecanoate.
摘要:
Organic peroxide polymerization co-initiator compositions and their use in the initiation of the polymerization of certain monomers and comonomers such as vinyl chloride, ethylene and methyl methacrylate. The co-initiator composition contains an alpha halo substituted diacyl peroxide and a coperoxide selected from t-alkyl peresters of t-hydroperoxides, peroxydicarbonates, acyl peroxycarbonic esters, and aliphatic diacyl peroxides. Typical is acetyl 2-chlorooctanoyl peroxide with t-butyl peroxy neodecanoate.
摘要:
A co-initiator system for polymerization of ethylenically unsaturated monomers comprising a preformed nitrile containing azo compound or symmetrical, diacyl peroxide in combination with an in situ or preformed acyl peroxy alkyl carbonate.
摘要:
A process for polymerizing vinyl chloride and for copolymerizing vinyl chloride and up to 30 percent by weight of comonomers in aqueous suspension under heat and pressure in the presence of a mixture of an acyl sulfonyl peroxide and a perester of the formula ##STR1## wherein R.sub.3, R.sub.4, and R.sub.5 are the same or different alkyl groups of from 1 to about 10 carbon atoms provided not more than one of R.sub.3, R.sub.4, and R.sub.5 is methyl, and R is selected from 2,2-dimethyl propyl and straight chain alkyl of 1-5 carbon atoms.
摘要翻译:在酰基磺酰基过氧化物和式IMA的混合物存在下,在加热和压力下,在水悬浮液中聚合氯乙烯和共聚氯乙烯和高达30重量%的共聚单体的方法,其中R3, R 4和R 5是相同或不同的1至约10个碳原子的烷基,不超过一个R 3,R 4和R 5是甲基,R选自2,2-二甲基丙基和直链烷基 1-5个碳原子。
摘要:
Novel tertiary alkyl peresters of tertiary hydroperoxides are used as polymerization initiators wherein the peresters are characterized by the tertiary alkyl group of the acid moiety having at least two alkyl groups of two or more carbon atoms and the tertiary alkyl group of the hydroperoxide has at least five carbon atoms. Typical is the polymerization of certain vinyl monomers such as vinyl chloride.
摘要:
Novel tertiary alkyl peresters of tertiary hydroperoxides are used as polymerization initiators wherein the peresters are characterized by the tertiary alkyl group of the acid moiety having at least two alkyl groups of two or more carbon atoms and the tertiary alkyl group of the hydroperoxide has at least five carbon atoms. Typical is the polymerization of certain vinyl monomers such as vinyl chloride.
摘要:
High density polyethylene is cross-linked with certain cyclic perketals including a group of novel cyclic perketals. Typical of the novel molecules is 3,6,6,9,9-pentamethyl-3-ethylacetate-1,2,4,5-tetraoxy cyclononane.
摘要:
A crosslinking system which includes a 1,2,4-trioxacycloheptane and a crosslink-promoting polyfunctional ethylenically unsaturated compound. This system is employed in a process of crosslinking a thermoplastic polymer. Preferred polymers, useful in this process, include ethylene homopolymers and copolymers.
摘要:
Dialkyl diacyl peroxides in which the alpha carbon atom of one of the alkyl groups is secondary and substituted by chloro and alkyl. The compounds are useful as polymerization initiators of ethylenically unsaturated monomers such as vinyl chloride.
摘要:
Acyl peroxycarbonic esters of the formula ##STR1## in which R is methyl or ethyl, R' is alkyl, and R and R' together have 17 or more carbon atoms. The compounds have unusual thermal stability, together with improved polymerization initiating efficiency. Particularly outstanding efficiency is found in connection with the polymerization of methyl methacrylate.